Intervalo de confianza para las normas del cefalograma resumido de Ricketts en niños de cubanos / Confidence interval for the standards of the Ricketts´summarized cephalogram in Cuban children

Introducción: en hallazgos cefalométricos de diferentes países en poblaciones con patrones de crecimientos y oclusión normal, se reportan diferencias estadísticamente significativas a los valores dados en los cefalogramas de Ricketts, Steiner, Downs, Jarabak y otros. En Cuba no existen estudios de estos patrones en niños con dentición mixta los que favorecerían un mejor diagnóstico de las anomalías dento-maxilofaciales. Objetivo: proponer el perfeccionamiento de las normas del cefalograma resumido de Ricketts para los niños. Materiales y Métodos: investigación observacional, descriptiva en cuatro poblaciones pertenecientes a las siguientes zonas del país: Matanzas, Cárdenas, Camagüey y Sancti Spíritus. El universo estuvo constituido por 1 657 niños de 9 años de edad. La muestra 163 niños, seleccionados por el método estratificado por conglomerados con oclusión dentaria normal. Se utilizó el análisis del cefalograma resumido de Ricketts y la prueba t de media para determinar los valores de las variables estudiadas y se hicieron estimaciones puntuales y por intervalos de confianza. Resultados: tres variables mostraron medias iguales a las normas de Ricketts: eje facial (90°), profundidad facial (87°) y profundidad maxilar (90°). En las restantes fueron comprobadas diferencias significativas. Se obtuvo un intervalo de confianza para cada una de las variables del cefalograma resumido de Ricketts. Conclusiones: solamente tres variables presentaron valores similares a los planteados por Ricketts, las restantes presentaron valores que difieren significativamente de los planteados por Ricketts. Se propone utilizar el intervalo de confianza obtenido en esta investigación en las variables del cefalograma resumido de Ricketts para diagnosticar las anomalías dento-maxilofaciales en niños cubanos (AU).

Introduction: in cephalometric findings from different countries in populations with normal growing and occlusion patterns, significant statistic differences are reported in relation to the values given in the cephalograms of Ricketts, Steiner, Downs, Jarabak, and others. In Cuba there are not studies of these patterns in children with mixed dentition that might allow a better diagnosis of dental, maxilla-facial anomalies. Objective: to propose the improvement of the standards of the Ricketts abridge cephalogram for children. Materials and methods: descriptive, observational research in four populations belonging to different regions of the country: Matanzas, Cárdenas, Camagüey and Sancti Spíritus. The universe was formed by 1675 children aged 9 years old; the sample, 163 children with normal dental occlusion, was chosen by the stratified method per conglomerate. The analysis of the Ricketts summarized cephalogram and the mean T test were used to determine the values of the studied variables; punctual estimates and estimates by confidence interval were carried out. Results: three variables showed equal means than Ricketts' standards: facial axis (90o), facial depth (87o) and maxillary depth (90o). In the remaining variables there were found significant differences. A confidence interval was obtained for every one of the Ricketts' summarized cephalogram variable. Conclusions: only three variables showed values similar to those given by Ricketts. The remaining ones presented values significantly differing from those established by Ricketts. The proposition is using the confidence interval obtained in this research in the variables of the Ricketts' summarized cephalogram to diagnose the dental-maxillafacial anomalies in Cuban children (AU).

Analysis on curative effect of functional orthodontic treatment in patients with Class II division 1 malocclusion / 吉林大学学报(医学版)

Objective: To detect the clinical effect of T win-Block appliance in the treatment of the patients with Class II division 1 malocclusion, and to provide the basis for clinical treatment. Methods: A total of 30 patients with class II division 1 malocclusion were treated with Twin-Block appliance. The variables of the patients before and after treatment were measured with Ricketts cephalometric radiographys. Results: Compared with before treatment, the length of corpora mandibulae (Xi-Pm) of the patients after treatment was increased by 2. 50 mm (P<0. 05), the SNB angle was increased by 2. 58° (P<0. 05), and the ANB was decreased by 2. 71 (P<0. 01); the molar relationship distance and the Overjet were decreased by 2. 81 mm and 3. 68 mm, respectively (P<0. 01); the Ll-OP was decreased by 1.89 mm, the distance of Ll-APog was increased by 1.84 mm, and the angle Ul-APog was decreased by 7. 35° (P<0. 01); the Ls-TVL was increased by 1. 85 mm, the Sm-TVL was increased by 2. 12 mm (P<0. 05), and the Pos-TVL was increased by 2. 89 mm (P<0. 05). Conclusion: The Twin-Block appliance could obviously promote the development of mandibular bone, upright the anterior teeth and improve the lip angle of upper anterior teeth and the proflie in the treatment of the patients with class II division 1 malocclusion in the growth development period.

Relación del ángulo interincisivo con el tipo de clase esquelética antero-posterior en pacientes atendidos en la segunda especialidad de ortodoncia y ortopedia maxilar de la Universidad Católica Santa María / Relationship of the interincisive angle with the type of anteroposterior skeletal class in patients treated in the second speciality of orthodontics and maxillofacial orthopedics of Universidad Catolica Santa Maria

Objetivos: Evaluar las características del incisivo superior con el incisivo inferior, ver su angulación 130° (+/-6°) y relacionarlo con el tipo de clase esquelética antero posterior. Observar si existe una relación del ángulo interincisivo con el tipo de clase esquelética antero-posterior. Material y métodos: Se utilizaron como metodología, los análisis cefalométrico de Steiner y Ricketts por ser de suma importancia para el diagnóstico y plan de tratamiento para el especialista en ortodoncia ortopedia maxilar. Por tener mayor nitidez y buen contraste en comparación con las analógicas y así poder localizar los puntos cefalométricos más importantes se examinaron 60 radiografías laterales de cráneo digitales; estas fueron tomadas a pacientes de la segunda Especialidad de Ortodoncia y Ortopedia Maxilar de la Universidad Católica Santa María (UCSM) entre las edades de 12 a 16 años con presencia de los incisivos centrales superiores e inferiores. Los datos fueron obtenidos mediante trazados en papel de acetato de acuerdo a los puntos cefalométricos más importantes, los datos angulares y lineales obtenidos se recopilaron en una ficha de registro de datos. Resultados: Se presentó una mayor cantidad de pacientes con un ángulo interincisivo disminuido menor a la norma, y una mayor frecuencia de clase II esqueletal mayor a la norma, la gran mayoría fueron del género femenino que acudieron a la Segunda Especialidad de Ortodoncia y Ortopedia Maxilar, En menor incidencia el ángulo interincisivo aumentado y normal y la clase esquelética III y I. Conclusiones: Los pacientes que presentaron con mayor frecuencia una relación del ángulo interincisivo con el tipo de clase esquelética antero-posterior fueron los que estaban comprendidos entre 12 y 16 años de edad. (AU)

Objectives: To evaluate the characteristics of the upper incisor, with the lower incisor see its angulation 130 ° (+/- 6 °) and relate it to the type of anteroposterior skeletal class. Observe if there is a relation of the interincisive angle with the type of antero-posterior skeletal class. Material and methods: The cephalometric analysis of Steiner and Ricketts was used as methodology for being of paramount importance for the diagnosis and treatment plan for the orthodontic specialist in maxillary orthopedics. The materials to be used were 60 digital lateral skull radiographs to have greater sharpness and good contrast in comparison with the analogical ones and to be able to locate the most important cephalometric points. These were taken to patients of the second Specialty of Orthodontics and Maxillary Orthopedics of the UCSM, between the ages of 12 and 16 years with presence of the upper and lower central incisors. The data were obtained by drawing on acetate paper according to the most important cephalometric points, the angular and linear data obtained were collected in a data log. Results: Were presented, a greater number of patients with a decreased interincisive angle lower than the norm, and a higher frequency of skeletal Class II greater than the norm, the great majority were of the feminine gender that went to the Second Specialty of Orthodontics and Orthopedics The incidence of increased and normal interincision angle and skeletal class III and I. Conclusions: Patients who most frequently presented a ratio of the interincisive angle to the type of anteroposterior skeletal class were those between 12 and 16 years of age. (AU)

Changes in longitudinal craniofacial growth in subjects with normal occlusions using the Ricketts analysis / 대한치과교정학회지

OBJECTIVE: This study was designed to define the Korean norm values for the Ricketts analysis. METHODS: In this longitudinal study, lateral cephalograms of 31 subjects with normal occlusion were taken biennially from ages 9-19 years. Cephalometric measurements were performed. Parameters for which the 10-year change did not exceed one standard deviation were defined as unchanged. The means and standard deviations for the measured parameters were determined for each age group. RESULTS: No significant changes in growth were observed in the molar relationship, incisor overjet, incisor overbite, mandibular incisor extrusion, interincisor angle, lower incisor tip (B1) to A point-Pogonion (A-PO) plane, upper incisor tip (A1) to A-PO plane, B1 inclination to A-PO, A1 inclination to A-PO, B1 inclination to Frankfurt plane (FH), convexity, lower facial height, facial axis, maxillary depth, maxillary height, palatal plane to FH, cranial deflection, ramus Xi position, or porion location. Continual changes over the 10 years of growth were observed in the maxillary first molar distal position to pterygoid true vertical plane, facial depth, mandibular plane to FH, anterior cranial length, mandibular arc, and corpus length. CONCLUSIONS: Clinicians can apply the Korean norms at age 9 as determined in this study when using the Ricketts analysis. The patient's age at the beginning of treatment and their sex should be taken into consideration when drawing visual treatment objectives.

Normas del cefalograma de Ricketts en niños de Matanzas / Ricketts' cephalogram norms observed in children from Matanzas

El estudio de los procesos de crecimiento y desarrollo permite identificar y diagnosticar las anomalías existentes con el fin de determinar la conducta terapéutica adecuada lo más temprano posible, bajo el criterio de que las maloclusiones con características esqueletales no se agraven en esta etapa de la vida y se conviertan posteriormente en problemas severos de difícil solución y pronóstico. Objetivo: determinar los valores medios de las variables del cefalograma de Ricketts, en niños de 9 años de edad. Métodos: se realizó una investigación de desarrollo en niños de las ciudades de Matanzas y Cárdenas. El universo estuvo constituido por los 1 128 niños examinados. Se seleccionó una muestra por el método de muestreo estratificado por conglomerados en dos etapas de 103 niños con oclusión dentaria normal, en los cuales se realizó el análisis del Cefalograma de Ricketts. Se utilizó la prueba t de media para determinar los valores de las variables del estudio que presentaron diferencias significativas con respecto a los de las variables de Ricketts. Resultados: se obtuvo que cuatro variables mostraron medias iguales a las normas de Ricketts: eje facial (90°), profundidad facial (87°), ángulo plano mandibular (26°) y profundidad maxilar (90°). En las variables restantes fueron comprobadas diferencias significativas: altura facial inferior (43°), arco mandibular (32°), convexidad facial (3 mm), incisivo inferior a A-Po (5 mm), inclinación del incisivo inferior (26°), primer molar superior a PTV (14 mm), incisivo inferior al plano oclusal (2 mm), ángulo interincisivo (123°), y protrusión del labio inferior (3 mm). Conclusiones: este estudio determinó que solamente cuatro variables presentaron valores similares a los planteados por Ricketts, las nueve variables restantes presentaron valores que difieren significativamente de los planteados por Ricketts(AU)

The study of the growth and development processes allows identifying and making diagnosis of anomalies to determine as early as possible the most adequate treatment, with the criteria of preventing malocclusions with skeletal characteristics from turning into more serious problems of difficult solution and prognosis in the future. Objective: to determine the mean values of Rickett's cephalogram in nine years-old children. Method: a development research was conducted in children from Matanzas and Cardenas. The universe of study was 1128 children and the final sample of 103 children with normal occlusion was selected by the stratified cluster sampling; they were analyzed using Ricketts' cephalogram. Mean t Test was used to determine values of the study variables, which showed statistically significant differences in comparison with Ricketts's variables. Results: it was proved that just four variables showed means equal to the Ricketts's norms. Conclusions: Four variables showed values similar to those of Ricketts's variables. The other nine were significantly different from those of Rickett's cephalogram(AU)

¿Es aplicable el cefalograma de Ricketts en diferentes poblaciones? / Is Rickett's cephalogram applicable in different populations?

El Cefalograma de Ricketts es reconocido a nivel mundial como uno de los estudios cefalométricos más utilizados y difundidos, pero laaplicación del mismo en todas las poblaciones aún está en análisis y discusión. En este trabajo se presenta una revisión de la literatura,con el objetivo de analizar la validez de la aplicación del Cefalograma de Ricketts en diferentes grupos étnicos y poblaciones. Además valorar si el mismo es aplicable a la población uruguaya. Los valores estudiados en dichos grupos son comparados con las normasestablecidas por el autor en el cefalograma original (Ricketts, 1972).

Rickett’s cephalogram is one of the most widely known and used cephalometric study, but its application on all populations is still under analysis and discussion. This piece of work presents a review of the literature with the objective of analyzing the cephalogram’s validity on different ethnic groups and populations. As well as to assess if the cephalogram is applicable to the Uruguayan population.The values studied on such groups are compared to the norms established by the author on the original cephalogram (Ricketts, 1972).

Which Line to Kiss. A Review of Reference Lines For Lip Profile.

Orthodontists have their own preferences in selecting the reference line for evaluation of the upper and lower lip in treatment planning and post treatment results. The reference line should provide the orthodontist with objective assessment of the facial esthetics. The reference plane selected should be sensitive, reliable with consistency. The commonly used reference line are: Rickett’s E- line, Holdaway’s line, Steiner’s S1- line, Burstone’s B- line and Sushner’s S2- line and Merrified Z-angle. This article reviews the planes and the studies evaluating them.

Detección de incrementos de dimensión vertical oclusal mediante análisis cefalométrico de Ricketts / Detection of increases of vertical occlusal dimension by Ricketts cephalometric analysis

Introducción: La rehabilitación de pacientes con desgastes severos es compleja cuando se determina un aumento de Dimensión Vertical. Los métodos de evaluación de Dimensión Vertical no entregan una información precisa para definir cuánto incremento es necesario. El análisis cefalométrico aparece como una opción adicional a las herramientas clínicas, específicamente el análisis de Ricketts contiene mediciones verticales del tercio inferior, a través del ángulo Altura Facial Inferior, cuyo valor normal es de 47o, pero con una desviación estándar alta. Objetivo: Determinar si el ángulo Altura Inferior de Ricketts es sensible a incrementos de Dimensión Vertical Oclusal (DVO). Método: A nueve sujetos entre 20 y 30 años se les realizó un análisis cefalométrico con el fin de medir el ángulo Altura Inferior de Ricketts, en posición MIC, y luego con incrementos de la Dimensión Vertical de 1, 3 y 5 mm. Resultados: Los resultados mostraron que el valor del ángulo Altura Inferior de Ricketts (AFI) aumentó con los incrementos de la Dimensión Vertical Oclusal de 1, 3 y 5 mm en todos los sujetos. Al análisis estadístico no paramétrico de Friedman, estos resultados son significativos (p=0.000). A la prueba Post Hoc de Siegel y Castellon la variación del ángulo Altura Inferior de Ricketts con el incremento de 1 mm de DVO no es significativa. Conclusiones: Se puede sugerir que el análisis cefalométrico de Ricketts, a través de la medición del ángulo AFI, es capaz de detectar incrementos en la DVO, pero la variación que se produce con 1 mm de incremento no es estadísticamente significativa.

Introduction: Oral rehabilitation of patients with severe wear, becomes complex when there is a need to increase Vertical Dimension. Evaluation methods of Vertical Dimension do not deliver accurate information to define as increase is necessary. The cephalometric analysis appears as an additional option to the clinical tools, specific Ricketts analysis containing vertical measurements of the lower third, through the Lower Facial Height angle, whose normal value is 47o, but with a high-standard deviation. Objective: To determine whether the Lower Height Ricketts angle is sensitive to increases in Oclusal Vertical Dimension (OVD). Method: Nine subjects aged 20 to 30 years-old underwent cephalometric analysis in order to measure the Lower Height Ricketts angle in centric occlusion position, then increasing OVD in 1, 3 and 5 mm. Results: Lower Height Ricketts angle showed an increase as OVD of 1, 3 and 5 mm augmented in all subjects. Nonparametric Friedman´s statistical analysis was applied, being the results statistically significant (p=0.000). According to Post Hoc test of Siegel and Castellon, Lower Height Ricketts angle variation of 1 mm is not statistically significant. Conclusions: It may be suggested that the Ricketts cephalometric analysis by measuring the Lower Height angle is able to detect increases in the OVD, but the change that occurs within 1 mm increase is not statistically significant.

Avaliação cefalométrica de pacientes respiradores bucais / Cephalometric evaluation of mouth-breathing patients

Introdução: A respiração ocupa um importante papel na matriz functional, assim como no crescimento e desenvolvimento do complexo maxilofacial. Objetivo: A proposta deste estudo foi avaliar a cefalometria de pacientes respiradores bucais. Método: A análise foi realizada em 40 pacientes, 22 do gênero feminino e 18 do masculino, de 5 anos a 14 anos e 4 meses de idade. Foram obtidas telerradiografias laterais, nas quais se realizou a análise cefalométrica sumária de Ricketts e o cálculo VERT. Resultados: Os resultados das análises apontaram uma diminuição do ângulofacial, altura facial inferior e arco mandibular e aumento da altura facial total, convexidade do ponto A e do grau de convexidade do perfil mole. A profundidade facial, ângulo do plano mandibular e profundidade maxilar ficaram dentro dos valores de normalidade. Na análise dentária, os incisivos inferiores e os molares superiores mostraram-se em posições normais, assim como a inclinação do incisivo inferior. Além disso, após análise estatística dos dados, constatou-se uma característica dolicofacial severa. Conclusão: O padrão de respiração bucal foi responsável por várias anormalidades no crescimento e desenvolvimento craniofacial.

Introduction: Breathing plays a part in the functional matrix, acting on plastic dynamics as well as the growth and development of the maxillofacial complex. Objective: The aim of the present study was to assess the cephalometrics of mouth-breathing patients. Methods: Analysis was carried out on 40 patients (22 females and 18 males), between five and 14 years of age at the Functional Orthopedics of the Maxillae Clinic of the Universidade Camilo Castelo Branco (SP, Brazil). Lateral tele-radiographs were obtained, for which Ricketts’s cephalometric analysis was performed and the VERT index was calculated. Results: The results of the analysis revealed a reduction in the angles of facial axis, height of the lower face and mandibular arch as well as an increase in total facial height, convexity of Point A and the degree of convexity of the soft profile. Facial depth, angle of the mandibular plane and maxillary depth were within the range of normality. In the dental analysis, the lower incisors, upper molars and inclination of the lower incisors were positioned normally. The VERT index value was high, indicating a severe dolichocephalic (long face) characteristic. Conclusion: The mouth breathing pattern was responsible for various abnormalities in craniofacial growth and development.

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.

A CEPHALOMETRIC COMPARATIVE STUDY OF SKELETAL CLASS III MALOCCLUSION AND CLASS I NORMAL OCCLUSION BY RICKETTS' ANALYSIS

The purpose of this study was to evaluate the parts of discrepancy on orthognathic surgical cases with skeletal Class III malocclusion. For this study, Ricketts' analysis that has suggested visual treatment objective, as named for growth predictable blue print, was used. The results of this study were as follows: 1. In the denture problem, mandibular incisor and molar was positioned more anteriorly in Class III malocclusion. 2. The location of A point was characteristically posteriorly positioned in the Class III group, and mandible plane angle was within normal range in the groups. 3. Position of upper and lower anterior teeth to A-Pogonion line was anteriorly positioned, and angulation of upper anterior tooth was lingually positioned in the Class III group, but angulation of lower anterior tooth was not significant in the both groups. 4. Esthetic line of Ricketts' analysis was not significant statistically. 5. Facial depth and axis was larger, but facial taper(facial plane mandible plane) was smaller in the Class III group. So, protruded and concave profile was seen in the Class III group. 6. Cranial deflection was larger in the Class III male group, ramus location was anteriorly positioned and mandibular length was enlarged in the male and female of Class III group.

Roentgenographic Cephalometric Study for Normal Occlusion in Korean Adults According to the Ricketts Analysis / 영남의대학술지

The purpose of this study was to assess the skeletal characteristics of the maxillofacial norms and the interpretation of craniofacial relations in Korean adults by applying the Ricketts Analysis. The factors of the applied lateral cephalometric measurements were composed of the 10 factor analysis (Summary Analysis) and 7 internal structures to be suggested by Ricketts. Lateral cephalograms were obtained from 60 subjects over 21 years old that consisted of 30 males and 30 females with normal occlusion, acceptable profile. The results were as follow: 1. The tables of means, standard deviations in each item and sex were made. 2. The author performed whether there was significance (P<0.05) between the registered male and female's measurement in each item.