Assessment and Comparison of the Head Posture and Craniofacial Growth in Vertical Dimension- A Cephalometric Study.

The aim of the present study was to examine as to whether any association can be found between the head posture and the craniofacial growth in the vertical direction.METHODSThe sample comprised of 150 subjects in the age group of 18 - 25 years and were further divided into three groups. These groups were classified into hypodivergent, normodivergent, and hyperdivergent according to the sella-nasion (SN) mandibular plane angle. The head posture was measured by calculating craniocervical and cervicohorizontal postural variables, recorded from the lateral cephalograms taken with the subjects standing with the head in the natural head position.RESULTSA clear pattern of association was found between the head posture and the vertical growth pattern. An extended head posture was seen in hyperdivergent group and flexion of the head was seen in hypodivergent group when compared to normodivergent cases (P<0.05, P<0.01). The findings were in agreement with the soft tissue stretching hypothesis according to which stronger forces are exerted on the facial skeleton whenever there is an increase in the tension in the soft tissue layer. When these forces are active for a long time during growth, they might restrict the growth of the maxilla and the mandible in forward direction and redirect it in a more caudal direction. Such a mechanism could explain the association between the extension of the head and the development of facial skeleton and in particular, the mandible.CONCLUSIONSThe cervical vertebral column area should be evaluated in routine cephalometric analysis and any deviation in the cervical column morphology and head posture should be registered. These registrations may prove useful when considering the diagnosis and evaluating the etiology, especially in patients with severe skeletal malocclusion and obstructive sleep apnea.

Alterações dentoesqueléticas associadas aos aparelhos Twin Block e Herbst com e sem ancoragem esquelética no tratamento da má oclusão Classe II: um ensaio clínico randomizado / Dentoskeletal changes associated to Twin Block and Herbst appliances with and without skeletal anchorage in the Class II malocclusion treatment: a randomized clinical trial

O objetivo deste ensaio clínico randomizado foi comparar os efeitos dentoesqueléticos associados ao tratamento da má oclusão de Classe II de Angle 1a divisão com propulsores mandibulares removíveis, fixos e associados à ancoragem esquelética. Após o exame de 1039 indivíduos, foram incluídos 34 pacientes Classe II de Angle, 1a divisão com overjet ≥ 6 mm, de 10 a 14 anos, no pico do surto de crescimento puberal e sem tratamento ortodôntico prévio. Estes pacientes foram distribuídos de forma randomizada em três grupos: (TB) tratado com aparelho removível de Twin Block (n = 13); (HAD) tratado com aparelho fixo cimentado de Herbst (n = 11); e (HAE) tratado com aparelho de Herbst associado a dois mini-implantes mandibulares (n = 10). Foram analisadas tomografias de feixe cônico antes da instalação do propulsor (T1) e após 12 meses de tratamento (T2). No programa ITK-SNAP®, foram construídos modelos 3D da maxila, mandíbula, incisivos centrais e 1os molares. No programa Dolphin Imaging®, foram gerados modelos 3D totais do tecido duro de T1 e T2, com orientação de cabeça padronizada e registro na base craniana anterior. O Modelo de Transferência de Coordenadas (MTC) foi obtido a partir do recorte padronizado do tecido mole de T1, nos planos axial, sagital e coronal. No programa Geomagic Qualify®, os modelos 3D parciais foram alinhados à posição espacial dos modelos 3D totais orientados e registrados. Foi utilizado um método automático para determinar os pontos centroides, que representaram a posição espacial de todas as estruturas anatômicas avaliadas. Os deslocamentos dos centroides entre T1 e T2 foram analisados no sistema de coordenados cartesiano elaborado com base no MTC. Para análise do crescimento maxilar e do mento foi utilizado o registro craniano; para a movimentação dentária e crescimento condilar, foram adotados os registros regionais em maxila e mandíbula. O teste de Wilcoxon avaliou as diferenças intra-grupo e o teste de Kruskal Wallis analisou as diferenças intergrupos das alterações esqueléticas e dentárias. Foram comparados os índices de sucesso na correção da sobressaliência e relação molar. Foi detectada restrição de crescimento anteroposterior da maxila (HAE: -0,26 ± 2,88 mm; TB -0,25 ± 0,66 mm; HAD: 0,18 ± 0,87 mm) e crescimento mandibular anteroposterior (HAE: 4,21 ± 2,96 mm; HAD: 3,49 ± 3,74 mm; TB: 1,24 ± 3,36 mm). No arco superior, foi observada mínima movimentação de incisivos e 1os molares (≤ 1 mm nos 3 planos). Os principais efeitos dentários ocorreram no arco inferior, na perda de ancoragem (HAD: 1,73 ± 0,64 mm; TB: 1,45 ± 1,13 mm; HAE: 1,07 ± 0,23 mm) e mínima projeção dos incisivos centrais (HAE: 0,93 ± 0,08 mm; HAD: 0,54 ± 0,36 mm; TB: 0,27 ± 0,18 mm). Quanto à eficácia, a maior correção do overjet foi obtida pelos grupos HAD (-4 ± 1,65 mm) e HAE (-4 ± 1,47 mm), seguidos pelo TB (-3 ± 3,25 mm). Na relação molar, a maior eficácia foi do grupo HAE (100% de sucesso, sobrecorreção de 85,7%), seguido pelo HAD (100% de sucesso, sobrecorreção de 70%), e TB (55,6% de sucesso). Concluiu-se que o aparelho de Herbst associado aos mini-implantes obteve maior eficácia na correção predominantemente esquelética da má oclusão de Classe II 1a divisão, do que os aparelhos de Herbst e Twin Block, após 12 meses de tratamento(AU)

The aim of this randomized controlled trial was to compare the dentoskeletal effects associated to the treatment of Angle Class II 1st division with removable, fixed and skeletal anchored functional appliances. After the clinical examination of 1039 individuals, 34 patients with Angle Class II, 1st Division, overjet ≥ 6 mm, 10 to 14 years old, at the peak of the pubertal growth spurt and no history of orthodontic treatment were included. These patients were randomized into three groups: (TB) treated with removable Twin Block appliance (n = 13); (HAD) treated with fixed cemented Herbst appliance (n = 11); and (HAE) treated with Herbst appliance associated to two mandibular mini implants (n = 10). Cone-beam CT scans were obtained before (T1) and after 12 months of treatment (T2). In the ITK-SNAP® software, 3D models of the maxilla, mandible, central incisors and 1st molars were built. In the Dolphin Imaging® software, full 3D models of T1 and T2 hard tissue were generated, with standardized head orientation and registration in the anterior cranial base. The Coordinate Transfer Model (CTM) was obtained from the T1 soft tissue, with standardized slices in the axial, sagittal and coronal planes. In the Geomagic Qualify® software, the partial 3D models were aligned to the spatial position of the oriented and registered full 3D models. An automatic method was used to determine centroid points, which represented the spatial position of all evaluated anatomical structures. Centroid displacements between T1 and T2 were analyzed using the Cartesian coordinate system based on the CTM. The cranial register was used to analyze the growth of maxilla and chin; to measure tooth movement and condylar growth, the regional register in the maxilla and mandible were adopted. The Wilcoxon test assessed intra-group differences and the Kruskal Wallis test analyzed intergroup differences in skeletal and dental changes. Success rates for overjet correction and molar relationship were compared. Anteroposterior maxillary growth restriction was detected (HAE: -0.26 ± 2.88 mm; TB -0.25 ± 0.66 mm; HAD: 0.18 ± 0.87 mm) and also anteroposterior mandibular growth (HAE: 4.21 ± 2.96 mm; HAD: 3.49 ± 3.74 mm; TB: 1.24 ± 3.36 mm). In the upper arch, minimal movement of incisors and 1st molars was observed (≤ 1 mm in the 3 planes). The main dental effects occurred in the lower arch, in the anchorage loss (HAD: 1.73 ± 0.64 mm; TB: 1.45 ± 1.13 mm; HAE: 1.07 ± 0.23 mm) and minimal projection of central incisors (HAE: 0.93 ± 0.08 mm; HAD: 0.54 ± 0.36 mm; TB: 0.27 ± 0.18 mm). The highest overjet correction was obtained by the HAD (-4 ± 1.65 mm) and HAE (-4 ± 1.47 mm) groups, followed by TB (-3 ± 3.25 mm). In the molar relationship, the highest efficacy was in the HAE group (100% successful, 85.7% overcorrected), followed by HAD (100% successful, 70% overcorrected), and TB (55.6% successful). It was concluded that the Herbst appliance associated with mini-implants had greater efficacy in predominantly skeletal correction of Class II 1st division malocclusion than the Herbst and Twin Block appliances after 12 months of treatment(AU)

Evaluación de los indicadores antropométricos en los adolescentes según su estado nutricional / Anthropometric indicators according to teenagers’ nutritional conditions

Introducción: durante el crecimiento y desarrollo craneofacial, la nutrición interviene en el logro del máximo potencial posible, en el desarrollo de la cara, los maxilares y los dientes. Objetivo: evaluar los indicadores antropométricos craneales, faciales e intrabucales, según el estado nutricional de los adolescentes. Métodos: se realizó un estudio transversal para evaluar los indicadores antropométricos craneales, faciales e intrabucales, atendiendo al estado nutricional y el índice de la masa corporal, en los adolescentes de 14 a 15 años, pertenecientes al policlínico Máximo Gómez, del municipio de Holguín, provincia Holguín, Cuba. La muestra estuvo constituida por dos grupos de adolescentes: nutridos y desnutridos, a quienes se les realizaron mediciones antropométricas generales del neurocráneo, viscerocráneo e intrabucales. Resultados: los valores promedio de peso y talla fueron: 49,3 ± 5,63 kg y 1,64 ± 0,06 m, en el grupo control, y de 34,9 ± 2,15 kg y 1,53 ± 0,03 m en los desnutridos. Las dimensiones craneales fueron mayores en el grupo control, con el diámetro transverso de la cabeza (14,0 ± 0,90 cm. -grupo control-, 13,0 ± 0,39 cm.-grupo desnutridos), y la circunferencia cefálica (55,9 ± 1,44 cm. - grupo control-, 53,9 ± 1,31 cm.-grupo desnutridos), las que presentaron diferencias significativas entre ambos grupos (p < 0,05). Los indicadores faciales e intrabucales fueron mayores en el grupo control, con diámetros transversos del maxilar de 35,4 ± 0,93, 41,4 ± 1,49 y 47,2 ± 0,80 mm y en el grupo de los desnutridos de 34,4 ± 0,58, 39,7 ± 1,15 y 45,8 ± 0,95 mm. Conclusiones: las variables antropométricas craneales, faciales e intrabucales presentaron diferencias significativas entre los grupos, con valores inferiores en el grupo desnutridos.

Introduction: craniofacial growth involves nutrition as the maximum possible potential of face, maxilla and teeth development. Objective: to evaluate cranial, face and intrabucals anthropometric indicators, according to teenagers´ nutritional conditions. Methods: a cross-sectional study was applied, to evaluate cranial, face and intrabucals anthropometric indicators of nutritional conditions, on teenagers from 14 to 15 years old, at Máximo Gómez polyclinic, from Holguín, Cuba. Sample was formed by 2 groups: well-fed and undernourished individuals. General, neurocranium, viscerocranium and intrabucals anthropometric measurements were taken. Results: control group weight and height rates were: 49.3 ± 5.63 kg and 1.64 ± 0.06 m. In the undernourished group: 34.9 ± 2.15 kg and 1.53 ± 0.03m. Cranial dimensions were major in the control group, being transverse head diameter (14.0 ± 0.90 cm - control group -, 13.0 ± 0.39 cm. undernourished group), and the cephalic circumference (55.9 ± 1.44 cm - control group -, 53.9 ± 1.31 cm at undernourished group), with significant differences between the groups (p < 0.05). Facial and intrabucals indicators were higher in the control group, being the transverse diameters of the maxilla in the control group: 35.4 ± 0.93, 41.4 ± 1.49 y 47.2 ± 0.80 mm, and in the undernourished group: 34.4 ± 0.58, 39.7 ± 1.15, and 45.8 ± 0.95 mm. Conclusions: cranial, facial and intrabucals anthropometric indicators showed significant differences between groups, obtaining low values in the undernourished group.

Cephalometric aspects of thalassemic children in the Indian subcontinent: A cross-sectional study

To compare the cephalometric characteristics of thalassemic children in the Indian subcontinent with the controls, matched for sex and dental age. Methodology: A total of 31 thalassemic children were a part of the study. Cephalometric readings were recorded for the study and the control group. Results: Within the Group I stage, the anterior cranial base length was 68.40±2.93 mm, shorter when compared to the control group. In the Group II stage, the maxillary/mandibular angle was 31.58° for the case group and the mandibular length was shorter in comparison to the controls. In the Group III stage, the SNB angle was 76.42°, lesser than the control group. A relative maxillary prognathism of 9.88 mm and 12.85 mm was observed in thalassemic males and females respectively through the Wiley's analysis. Conclusion: The overall picture depicted a retruded position of the maxilla and a retrognathic mandible within the study group. A class II profile has also been observed among the study subjects.

Correlation between craniofacial growth and upper and lower body heights in subjects with Class I occlusion

ABSTRACT Objective: To correlate skeletal age, standing height, upper and lower body lengths, and selected craniofacial growth features in a sample of growing individuals, and to model craniofacial growth using multivariate regression. Methods: This was a retrospective cross-sectional study with 447 African black boys and girls, between the ages 8 and 16 years, who attended the dental clinic at one hospital. The skeletal maturational age was determined from hand-wrist radiographs using the Greulich and Pyle atlas. Craniofacial measurements representing maxillary length (Ar-ANS), mandibular length (Ar-Gn), and lower facial height (ANS-Me) were calculated from lateral cephalograms in habitual occlusion. Body lengths were clinically measured in centimeters. Results: Moderate correlations (r=0.42 to 0.68) were observed between skeletal age and the three selected craniofacial measurements. Statistically significant correlations were also found between the craniofacial measurements and both upper and lower body lengths. The mandibular length had a stronger correlation with the upper body length than with the lower body length. Multiple regression analyses to determine maxillary and mandibular lengths suggested that sex, upper and lower body lengths might be used to determine maxillary length; while skeletal age, upper and lower body lengths might help determine mandibular length. Conclusions: Based on the relatively strong correlation between upper body length and mandibular length, further research in this area may warrant its use as a predictor for mandibular growth modification timing.

RESUMO Objetivo: correlacionar a idade esquelética, a estatura, as alturas corporais superior e inferior, e algumas características específicas do crescimento craniofacial, em uma amostra de indivíduos em crescimento, e delinear o crescimento craniofacial usando regressão multivariada. Métodos: esse estudo transversal retrospectivo foi feito com 447 meninos e meninas negros africanos, com idades entre 8 e 16 anos, atendidos na clínica odontológica de um hospital. A maturação esquelética, em anos, foi determinada a partir de radiografias de mão e punho, usando o atlas de Greulich e Pyle. As medidas craniofaciais representando o comprimento maxilar (Ar-ENA), o comprimento mandibular (Ar-Gn) e a altura facial anterior inferior (ENA-Me) foram calculadas a partir de cefalogramas laterais em oclusão habitual. Os comprimentos corporais foram medidos clinicamente, em centímetros. Resultados: correlações moderadas (r = 0,42 a 0,68) foram observadas entre a idade esquelética e as três medidas craniofaciais selecionadas. Também foram encontradas correlações estatisticamente significativas entre as medidas craniofaciais e as alturas corporais superior e inferior. O comprimento mandibular teve uma correlação mais forte com a altura corporal superior do que com a inferior. As análises de regressão múltipla para determinar os comprimentos maxilar e mandibular sugeriram que o sexo e as alturas corporais superior e inferior podem ser usados para determinar o comprimento maxilar, enquanto a idade esquelética e as alturas corporais superior e inferior podem ajudar a determinar o comprimento mandibular. Conclusões: com base na correlação relativamente forte entre a altura corporal superior e comprimento mandibular, pesquisas adicionais nessa área poderiam justificar seu uso como indicador para o período de modificação do crescimento mandibular.

Repercusiones de la roncopatía y respiración bucal en el crecimiento facial / Impact of snoring and mouth breathing on facial growth

Los trastornos respiratorios obstructivos del sueño corresponden a un amplio espectro de patologías que incluyen a los roncadores primarios, el síndrome de resistencia de vía aérea superior y al síndrome de apnea obstructiva del sueño (SAOS). Dentro de sus manifestaciones clínicas se encuentra la roncopatía y la respiración bucal, las cuales generan alteraciones en el crecimiento craneofacial del niño pudiendo ser la causa de un SAOS residual. El objetivo de esta revisión es analizar las alteraciones del crecimiento craneofacial en niños generadas por la roncopatía y respiración bucal.

Obstructive sleep breathing disorders correspond to a broad spectrum of diseases that include primary snorers, upper airway resistance syndrome and obstructive sleep apnea syndrome (OSAS). Its clinical manifestations include snoring and mouth breathing, which generates alterations in the craniofacial growth of the child that may be the cause of a residual OSAS. The objective of this review is to analyze the alterations of craniofacial growth generated by snoring and mouth breathing in children.

Desplazamiento de los puntos de referencia craneales utilizados en los análisis cefalométrico de jarabak y ricketts, durante el crecimiento activo / Displacement of cranial reference landmarks used in jarabak and ricketts cephalometric analysis during active growth

El objetivo de este trabajo fue evaluar el desplazamiento de los puntos craneales: Nasion, Silla, Basion, Porion, Orbitario y Pterigoideo, utilizados como referencia en los análisis cefalométricos de Jarabak y Ricketts durante el crecimiento activo. Se seleccionaron 120 telerradiografías de perfil en formato digital, correspondientes a 60 pacientes con 2 telerradiografías cada uno, tomadas con un intervalo de tiempo mínimo de 1 año (T1 y T2), en donde T1 se encuentra antes o durante el peak de crecimiento según el Estado de Maduración Cervical Vertebral (CVM) I, II ó III de Baccetti y T2 en estadio CVM IV,V,VI (después del peak de crecimiento). Un examinador previamente calibrado, ubicó los puntos analizados y para evaluar su desplazamiento, se realizaron mediciones en T1 y T2 (3 variables para cada punto), usando como referencia 2 planos que no se modifican a partir de los 5 años de edad (LCB y Vert-T). Para determinar el desplazamiento de los puntos, se calculó la variación promedio observada entre T1 y T2 y se realizó la prueba t para muestras pareadas o Wilcoxon (según distribución) para determinar la existencia de diferencias significativas. Además, se comparó la muestra por sexo, CVM inicial y CVM final. Se encontraron variaciones entre T1 y T2 en todas las medidas, aunque sólo en 5 de ellas se encontraron diferencias significativas; no se encontró diferencias al comparar por sexo, CVM inicial y final. Es así como podemos concluir que todos los puntos craneales analizados sufren desplazamiento durante el crecimiento. Los puntos Basion y Orbitario son los que sufren mayor desplazamiento. Es necesario analizar las implicancias de estas variaciones en los resultados obtenidos de los análisis cefalométrico y evaluar la necesidad de utilizar puntos de referencia alternativos.

The objective of this study was to evaluate the displacement of cranial reference points: Nasion, Sella, Basion, Porion, Orbitale and Pterygomaxillary, used in Jarabak and Ricketts cephalometric analysis, during active growth. Hundred and twenty digitalized lateral telerradiographies, corresponding to 60 patients (2 teleradiographies each one), were collected. The radiographies were taken with a minimum interval of one year between them (T1 and T2), where T1 is taken before or during the pubertal growth peack according to the cervical vertebral maturation stages developed by baccetti (CVM) I, II or III and T2 in CVM IV,V,VI (after the growth peak). Then, a previously calibrated examinator marked reference points and cephalometric measurements were taken (2 variables for each landmark). Measurements were made using craniofacial stable structures as references (stable basicranial line and Vertical T). To detect displacement in the landmark positions, t test or Wilcoxon test according to the distribution of each variable, was used to compare the data between T1 and T2. Also, comparisons were made by sex, and by initial and final CVM. All of the variables have variations between T1 y T2, but only 5 have a statistically significant difference. There were no differences between sexes and at initial and final CVM. In conclusion, all of the reference landmarks analyzed had displacement during active growth. Point Basion and Orbitale suffered the largest displacement. It is necessary to analyze the clinical implications of this displacement in order to evaluate the convenience of using alternative reference landmarks.

Long-term dental follow-up in hematological stem cells transplantation children / Acompanhametnto a longo prazo das alterações dentárias em pacientes pediátricos submetidos ao transplante de celulas tronco hematopoieticas

The aim of this paper is to update the current published content about the craniofacial long-term development disturbances of childhood hematopoietic stem-cell transplantation (HSCT) and the preparative regimens for the onco-hematological malignancies treatments. Methods: Two author sindependently reviewed the published articles about long-term effects of childhood HSCT that fitted into predetermined inclusion/exclusion criteria: clear definition of exposure or intervention, standard outcomes measurement and appropriate statistical analysis. Results: Twelve papers matched all the previous established eligibility criteria and were included in this review. The children’s age at HSCT were related to a higher risk of dental development disturbances, such as agenesis, dental hypoplasia, root stunting, crown-root proportion alterations, and microdontia. Craniofacial vertical growth was impaired in the irradiated patients without antero-posterior or latero-lateral impairment. Temporomandibular joint dysfunction was found to be more prevalent in the patients diagnosed withgraft-versus-host disease. Conclusion: The late effects of craniofacial development disturbances lead to several aesthetic and functional impairment, periodontal bone resorption with consequent impairment of chewing ability, and risk of early tooth loss often associated with life’s quality impairment. Further investigations should be performed to provide accurate information for patients, parent sand health care professionals...

Este artigo visa revisar o conteúdo publicado sobre as alterações tardias em crianças submetidas ao transplante de células-tronco hematopoiéticas(TCTH) e o regime pré-transplante para tratamento das doenças onco-hematológicas. Método: Dois autores independentes conduziram uma revisão simples dos artigos recentemente publicados sobre o tema, utilizando os critérios de exclusão/inclusão pré determinados: definição clara da intervenção clínica realizada, mensuração dos resultados padronizada e análise estatística adequada. Resultados: Doze artigos enquadraram-se em todos os critérios de avaliação pré-determinados para esta revisão. Houve correlação entre a idade da criança no momento do TCTH e maior risco de distúrbios de desenvolvimento dentário, como agenesia, hipoplasia dentária, encurtamento radicular,alterações da proporção coroa-raiz e microdontia.Houve alteração do crescimento craniofacial no sentido vertical sem, no entanto, alterar o crescimento anteroposterior e latero-lateral. Disfunção da articulação temporomandibular foi mais prevalente entre os pacientes com diagnostico de Doença do Enxerto contra o Hospedeiro. Conclusão: Os efeitos tardios do desenvolvimento craniofacial podem levara diversas alterações estéticas e funcionais, reabsorção óssea periodontal, diminuição da capacidade de mastigação e perda dentária precoce com possíveis impactos negativos sobre a qualidade de vida. Mais estudos são necessários para fornecer informações precisas aos pacientes, cuidadores e profissionais de saúde...

Picos de crecimiento facial vertical antes de los 12 años de edad y su relación con el desarrollo puberal en 44 mestizos colombianos sin tratamiento / Vertical facial growth peaks before the age of 12 and their relation with pubertal development in 44 untreated Colombian mestizos

Introducción: la mayoría de las investigaciones del crecimiento facial se enfocan hacia la documentación y predicción del crecimiento puberal opacando la descripción del crecimiento antes de los 12 años de edad. Aunque hay varias investigaciones en poblaciones caucásicas que han reportado los picos tempranos de crecimiento, ninguna lo ha ubicado y dimensionado con relación al pico puberal. En mestizos latinoamericanos no hay estudios reportados en la literatura. Métodos: desde 1992 el Grupo de Investigación de Labio y Paladar Hendido, Fisiología Oral y Crecimiento Craneofacial, CES-LPH, está haciendo un estudio longitudinal del crecimiento facial en 44 mestizos colombianos sin tratamiento con una muestra de 373 radiografías cefálicas laterales obtenidas durante 18 años de seguimiento. Resultados: de las 28 niñas de la muestra, 21 (75%) presentaron incrementos bienal mayores de 5 mm en la altura facial anterior (AFA) antes de los 12 años. En la altura facial posterior (AFP) hubo 9 (32%) niñas con incrementos bienales mayores a 5 mm antes de los 9 años. En 7 (43%) niños se presentaron incrementos bienales mayores a 5 mm en AFA antes de los 12 años y para la AFP hubo 9 (56%) niños con el mismo comportamiento antes de los 12 años. Para 5 de las niñas y 3 de los niños (18%), este fue el mayor pico de crecimiento en todo el seguimiento de la muestra desde los 6 hasta los 19 años, hallazgo no reportado anteriormente en la literatura. Conclusiones: los picos tempranos de crecimiento vertical (AFA y AFP) en niños menores de 9 años pueden explicar el éxito de las terapias tempranas de ortopedia funcional de los maxilares.

Introduction: most studies on facial growth focus on documenting and predicting pubertal growth, underestimating the description of growth before the age of 12. Although several studies on Caucasian populations have analyzed early growth peaks, none of the publications has related them with the pubertal peaks. Furthermore, no studies on Latin American mestizos are reported in the literature. Methods: since 1992, the Cleft Lip and Palate, Oral Physiology and Craniofacial Growth Research Group (CES-LPH for its Spanish initials) has been conducting a longitudinal study on facial growth in 44 untreated Colombian mestizos with a sample of 373 cephalic lateral radiographs obtained during a period of 18 years. Results: 21 of the 28 girls in the sample (75%) present major biennial increments of 5 mm in anterior face height (AFH) before age 12. In terms of posterior face height (PFH), there were 9 girls (32%) with biennial increases greater than 5 mm before 9 years old. 7 children (43%) presented biennial increases greater than 5 mm in AFH before the age of 12, and concerning PFH there were 9 children (56%) with the same behavior before the age of 12. For 5 girls and 3 boys (18%), this was the greatest growth peak throughout the follow-up period of a sample since the age of 6 until 19 years—a finding not previously reported in the literature—. Conclusions: early vertical growth peaks (AFH and PFH) in children younger than 9 years may explain the success of early functional jaw orthopedic therapies.

Caracterización del plano oclusal y diferentes marcos dentoesqueléticos en escolares entre 5 y 6 años / Characterization of the occlusal plane and dentoskeletal types inschool children between 5 and 6 years

Introduction and objectiveUnderstanding the anatomical and physiological modulation of the occlusal plane during growth is criticalin identifying some of the factors contributing to the establishment of malocclusion.To characterize the occlusal plane and the development of different dentoskeletal types in school childrenbetween 5 and 6 years.Materials and MethodsThis descriptive study considered a convenience sample of 107 schoolchildren who met the inclusioncriteria. The analyzed variables were Dental Framework, Kim, occlusal plane and FH plane, determined byusing anatomic and orbital positions, which served as reference points. Occlusal planes were determinedby considering deciduous and mixed dentition, respectively.ResultsThe classification of the occlusal plane identified in showed that in 65,7% of the school children there wasa stable occlusal plane, in 22,9% inclined and in 11,4% flat. In Class III, no data were found with respectto the inclined plane. All patients were between a stable and a flat occlusal plane. A greater proportionwas that of the angle of the acute maxillary plane. In the multivariate analysis identified a possible (11,5%) was found consistent of males with a Class II skeletal pattern, no occlusal plane angulation and obtuseangulation of the maxillary plane.ConclusionThere is a tendency for Class I children to have a stable occlusal plane, Class II individuals an inclinedocclusal plane, and Class III children a flat occlusal plane.

Introduction and objectiveUnderstanding the anatomical and physiological modulation of the occlusal plane during growth is criticalin identifying some of the factors contributing to the establishment of malocclusion.To characterize the occlusal plane and the development of different dentoskeletal types in school childrenbetween 5 and 6 years.Materials and MethodsThis descriptive study considered a convenience sample of 107 schoolchildren who met the inclusioncriteria. The analyzed variables were Dental Framework, Kim, occlusal plane and FH plane, determined byusing anatomic and orbital positions, which served as reference points. Occlusal planes were determinedby considering deciduous and mixed dentition, respectively.ResultsThe classification of the occlusal plane identified in showed that in 65,7% of the school children there wasa stable occlusal plane, in 22,9% inclined and in 11,4% flat. In Class III, no data were found with respectto the inclined plane. All patients were between a stable and a flat occlusal plane. A greater proportionwas that of the angle of the acute maxillary plane. In the multivariate analysis identified a possible (11,5%) was found consistent of males with a Class II skeletal pattern, no occlusal plane angulation and obtuseangulation of the maxillary plane.ConclusionThere is a tendency for Class I children to have a stable occlusal plane, Class II individuals an inclinedocclusal plane, and Class III children a flat occlusal plane.

Crecimiento facial vertical en 44 mestizos colombianos sin tratamiento desde los 6 hasta los 25 años Grupo CES-LPH / Vertical facial growth in 44 untreated colombian subjects from 6-to 25 years of age

Introducción y Objetivo: El crecimiento craneofacial posnatal es un proceso complejo que continúa aún después de los 20 años de edad. Cuantifi car por primera vez en una población mestiza latinoamericana y colombiana el desarrollo vertical facial anterior (AFA) y posterior (AFP). Materialesy Métodos: seguimiento cefalométrico bianual de 44 sujetos con apariencia facial normal y sin ningúntipo de tratamiento ortodóncico.Resultados: Hubo una disminución continua del ángulo del planomandibular (SN/PM) en ambos sexos. Se encontraron aumentos continuos de la AFA y AFP con diferencias signifi cativas por sexo a partir de los 16 años. El pico puberal para las mujeres de la AFA y AFP fue alrededor de los 13 años, para los hombres alrededor de los 15. Esta tendencia general mostró variaciones individuales importantes. Antes de los 11 años de edad el 63% de la muestra tuvo incrementos bianuales de más de 3 mm, después de los 16 años el 29,5% de los sujetos tuvo incrementos bianuales de más de 2 mm. Las mujeres después de los 18 años no tuvieron un patrón de rotación mandibular a favor de las manecillas del reloj, ni los hombres en contra. Conclusiones: se muestran diferencias importantes respecto a otros estudios reportados en poblaciones caucásicasen cuanto a la variabilidad individual, presencia de varias etapas de aceleración del crecimientovertical pre y pospuberalmente y rotación mandibular después de los 18 años. Estas diferencias no son debidas a características genéticas o nutricionales sino probablemente a cambios normalesdel crecimiento vertical facial.

Introduction and Objetive: The postnatal craniofacial growth is a complex process that continues even after 20 years of age. To quantify for the fi rst time, the anterior (AFA) and posterior vertical facial (AFP) developmental growth, in a mestizo Colombian and a latin-american population. Materials and Methods: Biannual cephalometric follow-up of 44 subjects with normal facial appearance and without any type of orthodontic treatment. Results: There was a continuous decrease of the mandibular plane angle SN / PM in both sexes. There were continuous increases in the AFA and AFP with signifi cant differences by sex after the age of 16. The pubertal peak for women in the AFA and AFP was about 13 years of age, and for men around the age of 15. This general trend showed signifi cant individual variations. Before the age of 11, 63% of the sample had biannual increments over 3 mm, after the age of 16, 29,5% of the subjects had biannual increases more than 2 mm. Women after the age of 18 had no clockwise mandibular rotation, neither did men had counterclockwise mandibular rotation. Conclusions: It is shown that there is an important difference between this study and other studies reported from Caucasian populations in terms of individual variability, presence of various growth spurt stages in the vertical facial height pre-and postpuberty. There was a non specifi c gender tendency of mandibular rotation after 18 years of age. These differences are not due to genetic or nutritional changes, but probably normal vertical facial growth changes.

Avaliação do crescimento crânio-facial em cardiopatas e não cardiopatas: estudo longitudinal / Evaluation of craniofacial growth in patients with and without heart disease: longitudinal study

O objetivo deste estudo longitudinal foi identificar as diferenças no padrão de crescimento crânio-facial de pacientes portadores de cardiopatas congênitas. A amostra foi composta por 43 pacientes que encontravam-se na faixa etária inicial de 7 a 12 anos, em atendimento de rotina no Ambulatório de Pediatria do Hospital Universitário Pedro Ernesto, os quais foram reavaliados num período médio de 8 a 10 anos. Foram obtidas radiografias cefalométricas nos tempos inicial (T1) e final (T2) de todos os 43 indivíduos, sendo a amostra dividida em grupo cardiopata com 23 pacientes e grupo não cardiopata com 20 pacientes. Na comparação entre cardiopatia e não cardiopatia, foram constatadas diferenças significativas entre os grupos em relação as proporções das medidas cefalométricas verticais da altura facial anterior superior e inferior. O padrão esquelético foi caracterizado por uma protrusão maxilar mais acentuada para o grupo não cardiopata e uma protrusão mandibular mais acentuada em ambos os grupos. O padrão de crescimento foi caracterizado por uma tendência a crescimento horizontal e vertical equilibrada nos indivíduos de ambos os grupos. O padrão dentário foi caracterizado por uma protrusão dos incisivos inferiores em relação à base óssea em ambos os grupos. O padrão estético foi caracterizado por uma retrusão dos lábios superior e inferior, em ambos os grupos. O padrão vertical foi caracterizado por uma tendência vertical em ambos os grupos, sendo caracterizado por uma diminuição mais acentuada da proporção entre a altura facial anterior superior e a altura facial anterior total e um aumento mais acentuado da proporção entre a altura facial anterior inferior e a altura facial anterior total para o grupo cardiopata, de forma significativa.

The aim of this longitudinal study was to evaluate the changes in craniofacial growth pattern of patients with congenital heart diseases. The sample comprised 43 pacients aged between seven and twelve who were under routine clinical care at Pedro Ernesto University Hospital. All pacients were reavaluated between a period of eigth and ten years. While the cardiopatic group was composed of 50 males and 38 females, the rest of the sample showing no heart disease included 20 males and 23 females. When comparing the cephalometric measurements between the groups, a significant difference was found in vertical anterior superior and inferior facial height. The skeletal pattern showed a maxillary protrusion in the group without heart disease and a mandibular protrusion in both groups with and without heart disease. Both groups also showed a balanced horizontal and vertical growth tendency and the dental pattern revealed an incisor protrusion, with the lower ones being more proclined in relation to the basal bone. The aesthetic pattern showed a retrusion in the upper and lower lip position, considering both groups and when considering the vertical pattern, both group presented a vertical tendency, characterized by significant decrease of the anterior superior facial height and an increase of the anterior inferior facial height in group with heart disease.

Inervación sensitiva y crecimiento mandibular: propuesta de modelo experimental para acceso quirúrgico al nervio alveolar inferior preservando estructuras musculoesqueléticas en conejo New Zealand White pos-destetados / Sensitive inervation and mandibular growth: a novel proposal for a surgical access to inferior alveolar nerve preserving musculoskeletal health in post-weaned New Zealand White rabbit

Numerosos estudios reflejan vínculos entre la inervación sensitiva y el desarrollo de la estructura ósea mandibular. Con la finalidad de obtener un modelo in vivo para estudiar el efecto de la alteración de la inervación sensitiva sobre el crecimiento mandibular, se propone un acceso quirúrgico al nervio alveolar inferior que evita dañar las estructuras músculo-esqueléticas consideradas esenciales en el crecimiento craneofacial. El modelo utilizado fue el conejo New Zealand White post-destetado. Primera etapa: se realizó un estudio mediante disección anatómica para elegir una vía de acceso quirúrgico. Se eligió el acceso por la región submandibular. Desde esta zona, se accede al nervio en su punto de ingreso al canal mandibular, entre la rama mandibular y el músculo pterigoideo medial. Segunda etapa: Se utilizaron 12 especímenes a los cuales se aplicó el procedimiento quirúrgico diseñado con ayuda y supervisión veterinaria. Posteriormente, los animales fueron controlados bajo condiciones estandarizadas durante 90 días. Se evaluaron los siguientes aspectos: 1. Progreso de curación de herida quirúrgica; 2. Se utilizó un protocolo de valoración de aplicabilidad del diseño quirúrgico basado en las directrices generales de Morton y Griffitt para detección de dolor y disconfort en animales de experimentación y las directrices específicas del Southwestern Medical Center para evaluación de dolor y disconfort en conejos. Según los parámetros analizados, no se observaron valores indicadores de inaplicabilidad del protocolo propuesto. El progreso de la herida quirúrgica se consideró normal. Estudios que analizan la participación de la inervación sensitiva en aspectos fisiológicos mandibulares muestran vías quirúrgicas para modificar la estructura nerviosa que implican alteraciones musculoesqueléticas. El procedimiento aquí presentado preserva estas estructuras y es bien tolerado por este animal en etapas tempranas de crecimiento. En consecuencia resulta una alternativa ...

Numerous studies have shown links between sensory inervation and mandibular bone development. In order to obtain an in vivo model to study the effect of altered sensory innervation on mandibular growth, a surgical approach for the inferior alveolar nerve transsection is proposed. This procedure avoids damage to muscular or skeletal structures that are considered essential in craniofacial growth. New Zealand White rabbits post-weaning were used. First stage: morphological study by anatomical dissection for choosing a surgical portal. The access chosen for the intervention was the submandibular region. From this area, it is possible to access the point where the nerve is entering into the mandibular canal, between the Ramus Mandibular and the Medial Pterygoid Muscle. Second stage: 12 specimens were submitted to the proposed surgical procedure under veterinary supervision. Subsequently, the animals were monitored under standard conditions for 90 days. The following aspects were evaluated: 1. Surgical wound healing; 2. A double protocol for assessing applicability of surgical design was used. The first was based on Morton and Griffitt general guidelines to detect pain and discomfort in experimental animals and the second was based on the Southwestern Medical Center guidelines for evaluation of pain and discomfort in rabbits. The progress of the surgical wound was considered normal. According to the parameters analyzed, the values obtained indicate that the protocol is applicable to the surgical procedure. Studies examining the contribution of sensory inervation concerning physiological aspects of the mandibular bone employ surgical methods to modify the nervous structure, thus provoking musculoskeletal disorders. The procedure presented here preserves these structures and is well tolerated by the animal in early stages of growth. For that reason, this method is a feasible alternative for studying the participation of sensory innervation in mandibular growth.

Avaliação cefalométrica do crescimento craniofacial em crianças leucodermas brasileiras, com má oclusão de Classe II durante as fases de crescimento determinadas pela maturação das vértebras cervicais / Cephalometric evaluation of craniofacial growth in Class II malocclusion and Normal Occlusion Brazilian children during stages of growth determined by maturation of cervical vertebrae

As características do crescimento craniofacial dos indivíduos portadores de má oclusão de Classe II na fase de crescimento, são de intenso interesse dos ortodontistas por esta má oclusão representar uma alta porcentagem dos casos em tratamento nos consultórios. Esta investigação objetivou estudar cefalométrica e comparativamente o crescimento craniofacial em crianças leucodermas portadoras de má oclusão de Classe II e de Oclusão Normal. Foram utilizadas 148 telerradiografias em norma lateral de 78 meninos e 70 meninas, faixa etária dos 7 aos 12 anos, portadores de má oclusão de Classe II, e 60 telerradiografias em norma lateral de 30 meninas e 30 meninos com Oclusão Normal. As amostras foram divididas considerando-se o estágio da maturação das vértebras cervicais pelo método de Hassel e Farman(HASSEL; FARMAN 1995), estando os grupos nos níveis Iniciação(I), Aceleração (A) e Transição (T) do desenvolvimento esquelético. Foram utilizadas as grandezas SNA, A-Nperp e Co-A para avaliar o componente maxilar; SNB, P-Nperp, Co-Gn, Co-Go e Go-Gn para o componente mandibular; ANB representou a relação maxilomandibular; SN.GoGn, FMA, NS.Gn, BaN.PtGn e ENA-Me para o componente vertical, e o ângulo da base do crânio representado por NS.Ba. O teste t independente foi aplicado: entre os grupos para verificar a precocidade dos índices entre os gêneros; em cada grupo e índice nos gêneros feminino e no masculino; na comparação entre os grupos em cada índice nos gêneros feminino e no masculino; na comparação entre os grupos na fase IT (Iniciação Transição) em cada gênero. Os resultados mostraram: precocidade do índice A (aceleração) no gênero feminino do grupo de Classe II. Na comparação entre os gêneros do grupo de Classe II no nível I, as medidas de Co-A, Co-Gn, Go- Gn e ENA-Me foram maiores no gênero masculino, que também apresentaram significância estatística no nível A, acompanhado de um maior FMA; no nível T, apenas Co-Gn e ENA-Me foram maiores no grupo de Classe II do...

Craniofacial growth characteristics of individuals with Class II malocclusion at the stage of growth are of intense interest os Orthodontists for this malocclusion represents a high percentage of cases where treatment in clinics. The purpose of this study was to compare the craniofacial growth changes through 148 (78 males and 70 females) lateral cephalograms of untreated subjects with Class II Division 1 malocclusion, at a mean age of 10,03 years, with those lateral cephalograms of 60 (30 males ans 30 females) subjects with normal occlusion, at a mean age of 10 years, divided by stages of development (Initiation, Acceleration and Transition) as defined by a biological indicator of cervical vertebrae skeletal maturity (HASSEL; FARMAN 1995). Cephalometric measurements in Class II and Normal Occlusion evaluated was SNA, A-Nperp, Co-A, SNB, P-Nperp, Co-Gn, Co-Go, Go-Gn, ANB, SN.GoGn, FMA, NS.Gn, BaN.PtGn, ENA-Me and NS.Ba. Statistical comparision of the growth changes in the study groups, stages os development and gender were performed with independent t test. Evaluating the Class II group, mens presented Co-A, Co-Gn, Go-Gn and ENA-Me larger at stage I and at stage A accompanied by greater FMA; in stage T, just Co-Gn and ENA-Me were the largest group of Class II of male gender. Evaluating the Normal Occlusion group, mens presented FMA, NSGn larger at stage I and at stage A, accompanied by greater Co-A, SNB, P-Nperp, Co-Gn and ENA-Me, while the female gender has greater value of NSBa; at stage T, only Co-Go was statistically higher in mens gender. In the comparision between the groups of female gender and stage I, the group Class II presented statistical significance for the variables A-Nperp, Co-Go, ANB, SN.GoGn, NS.Gn, BaN.PtGn, ENA-Me e NSBA; at stage A, Co-Go, ANB, NS.Gn, ENA-Me and NSBa were the largest group of Class II that had less BaN.PtGn; at stage T, just Co-Go and BaN.PtGn remained significant for the group Class II. In the comparision between the...

Avaliação cefalométrica do crescimento craniofacial em crianças leucodermas brasileiras, com má oclusão de Classe II durante as fases de crescimento determinadas pela maturação das vértebras cervicais / Cephalometric evaluation of craniofacial growth in Class II malocclusion and Normal Occlusion Brazilian children during stages of growth determined by maturation of cervical vertebrae

As características do crescimento craniofacial dos indivíduos portadores de má oclusão de Classe II na fase de crescimento, são de intenso interesse dos ortodontistas por esta má oclusão representar uma alta porcentagem dos casos em tratamento nos consultórios. Esta investigação objetivou estudar cefalométrica e comparativamente o crescimento craniofacial em crianças leucodermas portadoras de má oclusão de Classe II e de Oclusão Normal. Foram utilizadas 148 telerradiografias em norma lateral de 78 meninos e 70 meninas, faixa etária dos 7 aos 12 anos, portadores de má oclusão de Classe II, e 60 telerradiografias em norma lateral de 30 meninas e 30 meninos com Oclusão Normal. As amostras foram divididas considerando-se o estágio da maturação das vértebras cervicais pelo método de Hassel e Farman(HASSEL; FARMAN 1995), estando os grupos nos níveis Iniciação(I), Aceleração (A) e Transição (T) do desenvolvimento esquelético. Foram utilizadas as grandezas SNA, A-Nperp e Co-A para avaliar o componente maxilar; SNB, P-Nperp, Co-Gn, Co-Go e Go-Gn para o componente mandibular; ANB representou a relação maxilomandibular; SN.GoGn, FMA, NS.Gn, BaN.PtGn e ENA-Me para o componente vertical, e o ângulo da base do crânio representado por NS.Ba. O teste t independente foi aplicado: entre os grupos para verificar a precocidade dos índices entre os gêneros; em cada grupo e índice nos gêneros feminino e no masculino; na comparação entre os grupos em cada índice nos gêneros feminino e no masculino; na comparação entre os grupos na fase IT (Iniciação Transição) em cada gênero. Os resultados mostraram: precocidade do índice A (aceleração) no gênero feminino do grupo de Classe II. Na comparação entre os gêneros do grupo de Classe II no nível I, as medidas de Co-A, Co-Gn, Go- Gn e ENA-Me foram maiores no gênero masculino, que também apresentaram significância estatística no nível A, acompanhado de um maior FMA; no nível T, apenas Co-Gn e ENA-Me foram maiores no grupo de Classe II do...

Craniofacial growth characteristics of individuals with Class II malocclusion at the stage of growth are of intense interest os Orthodontists for this malocclusion represents a high percentage of cases where treatment in clinics. The purpose of this study was to compare the craniofacial growth changes through 148 (78 males and 70 females) lateral cephalograms of untreated subjects with Class II Division 1 malocclusion, at a mean age of 10,03 years, with those lateral cephalograms of 60 (30 males ans 30 females) subjects with normal occlusion, at a mean age of 10 years, divided by stages of development (Initiation, Acceleration and Transition) as defined by a biological indicator of cervical vertebrae skeletal maturity (HASSEL; FARMAN 1995). Cephalometric measurements in Class II and Normal Occlusion evaluated was SNA, A-Nperp, Co-A, SNB, P-Nperp, Co-Gn, Co-Go, Go-Gn, ANB, SN.GoGn, FMA, NS.Gn, BaN.PtGn, ENA-Me and NS.Ba. Statistical comparision of the growth changes in the study groups, stages os development and gender were performed with independent t test. Evaluating the Class II group, mens presented Co-A, Co-Gn, Go-Gn and ENA-Me larger at stage I and at stage A accompanied by greater FMA; in stage T, just Co-Gn and ENA-Me were the largest group of Class II of male gender. Evaluating the Normal Occlusion group, mens presented FMA, NSGn larger at stage I and at stage A, accompanied by greater Co-A, SNB, P-Nperp, Co-Gn and ENA-Me, while the female gender has greater value of NSBa; at stage T, only Co-Go was statistically higher in mens gender. In the comparision between the groups of female gender and stage I, the group Class II presented statistical significance for the variables A-Nperp, Co-Go, ANB, SN.GoGn, NS.Gn, BaN.PtGn, ENA-Me e NSBA; at stage A, Co-Go, ANB, NS.Gn, ENA-Me and NSBa were the largest group of Class II that had less BaN.PtGn; at stage T, just Co-Go and BaN.PtGn remained significant for the group Class II. In the comparision between the...

Estudo cefalométrico das alterações dos terços médio e inferior da face em pacientes com diferentes padrões respiratórios e faciais / Cephalometric study of the changes of the medium and lower thirds of the face in patients with different breathing and facial patterns

OBJETIVOS: avaliar a possível relação dos padrões respiratórios e dos tipos faciais com as grandezas da análise de Ricketts - CF-N.CF-A, Po-Or.ENA-ENP, CF-Go, CF-Xi.Po-Or, Xi-Pm, N-P.Go-M, A-NP, Po-Or.Na - e as grandezas da Nasofaringe e da Bucofaringe propostas por McNamara; dos tipos faciais com os padrões respiratórios e dos padrões respiratórios com as variáveis do Vert. MÉTODOS: a amostra consistiu de 88 telerradiografias em norma lateral de brasileiros leucodermas, dos gêneros masculino e feminino, entre 7 e 13 anos (média de idade 10,5 anos), sendo 45 respiradores bucais e 43 nasais. O método cefalométrico computadorizado abrangeu a análise das grandezas para determinação do tipo facial, segundo Ricketts (Índice Vert). Aplicou-se a avaliação do erro do método pela fórmula de Dahlberg (média = 0,52), seguida das avaliações estatísticas teste "t" de Student e Pearson product correlative coefficient test (p < 0,05). RESULTADOS E CONCLUSÕES: observou-se ausência de alterações estatisticamente significativas das variáveis quando relacionadas aos padrões respiratórios, e presença de diferenças estatisticamente significativas das variáveis Convexidade do ponto A, Altura posterior da face, Profundidade da maxila, Cone facial, Comprimento do corpo e Nasofaringe quando relacionadas aos tipos braqui e dolicofaciais. As variáveis Cone facial e Comprimento do corpo também apresentaram diferenças significativas entre os tipos braquifacial e mesofacial. A variável Cone facial apresentou diferenças significativas entre todos os tipos faciais; o tipo braquifacial apresentou correlação significativa (p = 0,011) com o padrão de respiração nasal e a variável Profundidade facial apresentou diferença estatisticamente significativa (p = 0,028) quando relacionada aos padrões respiratórios.

AIM: To assess the possible relation of respiratory patterns and facial types with linear and angular variables of the Ricketts analysis - CF-N.CF-A, Po-Or.ENA-ENP, CF-Go, CF-Xi.Po-Or, Xi-Pm, N-P.Go-M, A-NP, Po-Or.Na - and the Nasopharynx and Oropharynx linear variables proposed by McNamara; and of the facial types with the respiratory patterns, and the respiratory patterns with the Vert variables. METHODS: The sample consisted of 88 lateral teleradiographs of Brazilian leucoderm boys and girls, ranging from 7 to 12 years of age (mean age 10.5 years) of whom 45 were mouth-breathers and 43 nasal breathers. The computerized cephalometric method covered analysis of the variables to determine the facial type, according to Ricketts (Vert Index). After the measurements were taken, assessment of the method error by the Dahlberg formula was applied (mean = 0.52), followed by t Student and chi-square tests (p < 0.05) statistical assessments. RESULTS AND CONCLUSIONS: There were no statistically significant alterations in the variables when related to the respiratory patterns; there were statistically significant differences in the following variables: Convexity of point A, Posterior face height, Maxilla depth, Facial cone, Corpus length and Nasopharynx when related to the brachyfacial and dolicofacial types. The variables Facial cone and Corpus length also presented significant differences between the brachyfacial and mesofacial types, and the variable Facial cone presented significant differences among all the facial types; the brachyfacial type presented significant correlation (p = 0.011) with the nasal respiratory pattern; and Facial depth presented statistically significant difference (p = 0.028) when related to the respiratory patterns.

Avaliação da influência do tipo facial nos tamanhos dos espaços aéreos nasofaríngeo e bucofaríngeo / Evaluation of the influence of facial growth on the sizes of nasopharyngeal and oropharyngeal spaces

INTRODUÇÃO: a diminuição no tamanho do espaço aéreo nasofaríngeo, causada pela hipertrofia da tonsila faríngea, tem sido associada a alterações no padrão normal de crescimento craniofacial e a efeitos deletérios na oclusão. OBJETIVOS: avaliar variações nos tamanhos dos espaços aéreos nasofaríngeo e bucofaríngeo de acordo com o padrão de crescimento craniofacial, a correlação entre os tamanhos dos espaços e o índice VERT, além de verificar um possível dimorfismo sexual. MÉTODOS: foi utilizado um total de 90 telerradiografias laterais de pacientes, divididos em três grupos: meso, braqui e dolicofacial, determinados por meio do índice VERT de Ricketts. Os pacientes da amostra, com idades entre 9 e 16 anos, apresentavam padrão respiratório nasal, sem qualquer tipo de obstrução. RESULTADOS: não foi verificada variação estatisticamente significante nos tamanhos dos espaços aéreos nasofaríngeo e bucofaríngeo, quando comparados os três tipos faciais. Também não foi encontrada correlação entre os tamanhos dos espaços aéreos e os valores do índice VERT de Ricketts dos pacientes e não houve dimorfismo sexual. CONCLUSÕES: pode-se descartar a influência do tipo facial nos tamanhos dos espaços aéreos nasofaríngeo e bucofaríngeo.

INTRODUCTION: The variation in sizes of the nasopharyngeal and oropharyngeal space occurs due to genetic and/or environmental factors. The reduction in size of the nasopharyngeal space, caused by the hypertrophy of the pharyngeal tonsil, have been associated to alterations in facial growth pattern and to harmful effects in occlusion. AIM: To evaluate variations in size of the nasopharyngeal and oropharyngeal space according to facial growth pattern, to correlate the size of these spaces to the VERT index and to verify a possible sexual dimorphism. METHODS: A total of 90 lateral cephalometric radiographs of patients, divided into three groups (mesofacial, dolichofacial and brachyfacial, determined by the VERT index) were used. The patients of the sample, with ages between 9 and 16 years old, had a nasal respiratory mode, without any kind of nasal obstruction. RESULTS: The results did not show statistically significant variation in the size of nasopharyngeal and oropharyngeal, when compared the three facial growth pattern. Besides, there was no correlation between the size of the spaces and the VERT index and a sexual dimorphism was not observed. CONCLUSIONS: The conclusions discarded the influence of facial type in the sizes of nasopharyngeal and oropharyngeal spaces.

Análise genética de problemas craniofaciais: revisão da literatura e diretrizes para investigações clínico-laboratoriais (parte 1) / Genetic analysis of craniofacial problems: a review of the literature and some guidelines for clinical and laboratorial investigation (part 1)

INTRODUÇÃO: cada vez mais se descobre que os genes têm papel fundamental na etiologia dos problemas craniofaciais, no entanto, o conhecimento das bases da genética humana ainda está muito distante da prática diária do cirurgião-dentista clínico. OBJETIVO: o objetivo deste trabalho é ser uma fonte de consulta, provendo o leitor com conceitos e nomenclaturas pertinentes à área da genética humana. METODOLOGIA: os autores apresentam e revisam os principais tópicos relacionados à genética investigativa, sobretudo no que diz respeito às doenças ou distúrbios multifatoriais e complexos que alteram o processo normal de crescimento e desenvolvimento craniofacial. RESULTADOS E CONCLUSÕES: é essencial que esses profissionais se atualizem para poder acompanhar os progressos atuais e futuros, tanto na área clínica investigativa quanto na área das pesquisas moleculares laboratoriais.

INTRODUCTION: New researches show the important role played by genes in the etiology of craniofacial problems. In spite of that, knowledge of the basis of Human Genetics is still very far from the daily practice of clinical dentists. AIM: The main aim of this paper is to serve as a valuable source of information on Genetics for readers, supplying them with the main concepts and nomenclature in this field. METHODS: The authors provide an overview of central concepts and topical issues in modern genetic investigation, with special attention to the complex and multifactorial disorders that disturb the normal process of craniofacial growth and development. RESULTS AND CONCLUSION: It is indispensable for updated clinical dentists to have at least a basic knowledge about the basis of Human Genetics in order to follow its current and future progresses in both areas: clinical investigative and Molecular Genetics.

Mordida abierta anterior / Anterior open bite

Las mordidas abiertas pueden estar en relación con efectos de los tejidos esqueléticos, de los tejidos dentales y de tejidos blandos y, generalmente, involucran una combinación de estos (mordida abierta multifactorial). Algunas veces es posible identificar los factores etiológicos específicos pero, concretamente, en los casos de mordidas abiertas de origen esquelético, los factores responsables de la maloclusión no pueden ser identificados fácilmente. Los tratamientosde pacientes con mordida abierta se deben realizar tempranamente para que puedan tener éxito, en otra época se podría perder la oportunidad para influir en la modificación del crecimiento, lo cual llevaría a una corrección quirúrgica. El control de la dimensión vertical es considerado el factor más importante en el tratamiento de las mordidas abiertas y la intrusión de molares es el objetivo primario para llevar a cabo los propósitos del tratamiento. Se han propuesto varias modalidades deabordaje para resolver la mordida abierta. Un tratamiento convencional consiste en inhibir el crecimiento vertical del maxilar o intruir los molares maxilares con un aditamento terapéutico intraoral. Otra aparatología reportada incluye tracción vertical con mentoneras, elásticos, aparatos funcionales de ortopedia maxilar, bloques de mordida posterior, miniplacas de anclaje, técnica multiansas wires (MEAW, imanes y varias combinaciones de cirugía Ortognática. No es clara la relación entre disfunción temporomandibular y mordidas abiertas.

Open bites can be related to skeletal, dental, and soft tissue effects and generally obey to a combination of these factors (multifactorial). Sometimes it is possible to identify the specific etiologic factors, but especially in open-bite cases of skeletal origin, the factors responsible for the malocclusion can not be identified easily. Treatment of patients with open bite must be performed early to be successful. Otherwise the opportunity for growth modification could be lost, leaving surgical correction as the only possible treatment. Control of the vertical dimension is considered the most important factor in the treatment of open bite malocclusions and the molar intrusion is the primary treatment objective to achieve these treatment goals. Various treatment mo¬dalities have been proposed for the correction of anterior open bites. A conventional approach is to inhibit the vertical maxillary growth or to intrude maxillary molars with headgear. Other treatment devices reported include vertical-pull chin-ups, functional appliances, bite-blocks, tongue cribs, magnets, multi loop edgewise arch wires (MEAW therapy) miniplate anchorage and various orthognathic surgery combinations. Relationship between temporomandibular joint dysfunction and open bite is not clear.

A classification and prototyping of skeletal class iii on etio-pathogenic basis