Evaluación del aparato funcional postratamiento de Waveney como alternativa en la contención del avance mandibular

Fundamento: Para la contención del avance mandibular es necesario utilizar un aparato que mantenga la mandíbula en la posición lograda por los aparatos activos y que su diseño no provoque movimientos dentarios indeseados. Objetivo: Describir los cambios clínicos y cefalométricos del aparato funcional postratamiento de Waveney como alternativa en la contención del avance mandibular. Metodología: Se realizó una investigación descriptiva observacional de corte transversal en el servicio Ortodoncia de la Clínica Estomatológica Docente Provincial Dr. Justo Ortelio Pestana Lorenzo de la provincia Sancti Spíritus, desde septiembre 2019 a febrero 2022. Se seleccionaron 20 pacientes que iniciaron su etapa de contención en este período y cumplieron los criterios de inclusión. Se utilizaron métodos del nivel empírico y estadístico. Se analizaron las variables: edad, sexo, variables morfológicas clínicas y cefalométricas, así como resultado de la contención. Resultados: Se constató una edad promedio de 15.6; el 65 % de los escolares pertenecían al sexo femenino. Al año de iniciada la contención se mantuvo el sobrepase incisivo en 2.95 mm, la relación molar de neutroclusión en el 65 %, ángulo SNB en 79°, el ángulo ANB en 2.80°, la posición del incisivo superior 2.45 mm, la posición del incisivo inferior en 1.90 mm y el perfil estético en 0.55 mm. Solo existió incremento en el valor promedio del resalte incisivo de 2.70 mm a 2.75 mm. Conclusiones: Al año de iniciada la contención con el aparato funcional postratamiento de Waveney no se observó modificación de las variables estudiadas, excepto el resalte incisivo con incremento de su valor promedio.

Background: For mandibular advancement containment, it is necessary to use an appliance that holds the jaw in the achieved position by active appliances and that its design does not provoke undesired dental movements. Objective: To describe the clinical and cephalometric changes of the Orthodontic Appliances after the Waveney treatment as an alternative in the mandibular advancement containment. Methodology: A descriptive observational cross-sectional research was conducted at the Dr. Justo Ortelio Pestana Lorenzo Provincial Teaching Stomatology Clinic orthodontic service in Sancti Spíritus province, from September 2019 to February 2022. 20 patients who started their containment stage in this period and fulfilled the inclusion criteria were selected. Empirical and statistical methods were used. The following variables were analyzed: age, sex, clinical morphological and cephalometric variables, as well as the containment result. Results: An average age of 15.6 was found; 65% of the schoolchildren were female. One year after the containment was started, the incisive overpass was maintained at 2.95 mm, the neutroclusion molar rate at 65%, SNB angle at 79°, the ANB angle at 2.80°, the upper incisor position 2.45 mm, the lower incisor position by 1.90 mm and the esthetic profile by 0.55 mm. There was only an average increase in the incisor protrusion value from 2.70 mm to 2.75 mm. Conclusions: One year after containment with the Waveney post-treatment Orthodontic Appliances was initiated no changes were observed in the studied variables, except for incisor protrusion with an increase in its average value.

Accuracy of arch expansion with two thermoplastic materials in Invisalign® patients: EX30® and SmartTrack®

ABSTRACT Objective: The purpose of this retrospective study was to compare accuracy of arch expansion using two different thermoplastic materials in Invisalign aligners: EX30® (Polyethylene Terephthalate Glycol, or PETG) and SmartTrack® (polyurethane). Methods: The study sample comprised 65 adult patients consecutively treated with Invisalign from two private practices: group 1 - treated with EX30® (358 teeth) and group 2 - treated with SmartTrack® (888 teeth). Six hundred and twenty-three measurements were assessed in three digital models throughout treatment: model 1 - initial, model 2 - predicted tooth position, and model 3 - achieved position. Sixteen reference points per arch were marked and, after best alignment, 2 points per tooth were copied from one digital model to another. Linear values of both arches were measured for canines, premolars, and first molars: on lingual gingival margins and cusp tips of every tooth. Comparisons were performed by Wilcoxon and Mann-Whitney test. Results: Both termoplastic materials presented significant differences between predicted and achieved values for all measurements, except for the lower molar cusp tip in the SmartTrack® group. There is no statistical difference in the accuracy of transverse expansion between these two materials. Overall accuracy for EX30® aligners in maxilla and mandible were found to be 37 and 38%, respectively; and Smarttrack® presented an overall accuracy of 56.62% in the maxilla and 68.72% in the mandible. Conclusions: It is not possible to affirm one material expands better than the other. Further controlled clinical studies should be conducted comparing SmartTrack® and EX30® under similar conditions.

RESUMO Objetivo: O objetivo deste estudo retrospectivo foi comparar a acurácia na expansão da arcada utilizando alinhadores Invisalign com dois tipos de material termoplástico: EX30® (Polietileno Tereftalato Glicol, ou PETG) e SmartTrack® (poliuretano). Método: A amostra desse estudo incluiu 65 pacientes adultos tratados consecutivamente em dois consultórios particulares: grupo 1 - tratado com EX30® (358 dentes), e grupo 2 - tratado com SmartTrack® (888 dentes). Foram avaliadas 623 medidas em três pares de modelos digitais, ao longo do tratamento: modelo 1 - inicial, modelo 2 - posição dentária planejada, modelo 3 - posição alcançada. Foram marcados 16 pontos de referência por arcada e, após o bestfit, 2 pontos por arcada foram copiados de um modelo digital para o outro. Medidas lineares de ambas as arcadas foram aferidas para caninos, pré-molares e primeiros molares, localizadas na margem gengival lingual e ponta de cúspide de todos os dentes. Foram realizadas comparações usando os testes Wilcoxon e Mann-Whitney. Resultados: Ambos os materiais termoplásticos apresentaram diferenças significativas entre os valores planejados e alcançados em todas as medidas, exceto na ponta de cúspide dos primeiros molares inferiores do grupo SmartTrack®. Não houve diferença estatística entre esses dois materiais quanto à acurácia da expansão transversa. Em termos gerais, a acurácia dos alinhadores EX30® na maxila e mandíbula foi de 37% e 38%, respectivamente. O grupo SmartTrack® apresentou acurácia de 56,62% e 68,72% na maxila e mandíbula, respectivamente. Conclusões: Não foi possível afirmar que um material expande melhor que o outro. Estudos clínicos controlados futuros devem ser conduzidos comparando SmartTrack® e EX30® sob condições similares.

Insertion torque, flexural strength and surface alterations of stainless steel and titanium alloy orthodontic mini-implants: an in vitro study

ABSTRACT Objective: This study aimed to compare the insertion torque (IT), flexural strength (FS) and surface alterations between stainless steel (SS-MIs) and titanium alloy (Ti-MIs) orthodontic mini-implants. Methods: Twenty-four MIs (2 x 10 mm; SS-MIs, n = 12; Ti-MIs, n = 12) were inserted on artificial bone blocks of 20 lb/ft3 (20 PCF) and 40 lb/ft3 (40 PCF) density. The maximum IT was recorded using a digital torque meter. FS was evaluated at 2, 3 and 4 mm-deflection. Surface topography and chemical composition of MIs were assessed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). General linear and mixed models were used to assess the effect of the MI type, bone density and deflection on the evaluated outcomes. Results: The IT of Ti-MIs was 1.1 Ncm greater than that obtained for the SS-MIs (p= 0.018). The IT for MIs inserted in 40 PCF test blocks was 5.4 Ncm greater than that for those inserted in 20 PCF test blocks (p < 0.001). SS-MIs inserted in higher density bone (40 PCF) had significantly higher flexural strength than the other groups, at 2 mm (98.7 ± 5.1 Ncm), 3 mm (112.0 ± 3.9 Ncm) and 4 mm (120.0 ± 3.4 Ncm) of deflection (p< 0.001). SEM evidenced fractures in the Ti-MIs. EDS revealed incorporation of 18% of C and 2.06% of O in the loaded SS-MIs, and 3.91% of C in the loaded Ti-MIs. Conclusions: Based on the findings of this in vitro study, it seems that SS-MIs offer sufficient stability and exhibit greater mechanical strength, compared to Ti-MIs when inserted into higher density bone.

RESUMO Objetivo: O objetivo deste estudo foi comparar o torque de inserção (TI), a resistência flexural (RF) e as alterações de superfície em mini-implantes ortodônticos de aço inoxidável (MIs-Ai) e de liga de titânio (MIs-Ti). Métodos: Vinte e quatro MIs (2 x 10 mm; MIs-Ai, n = 12; MIs-Ti, n = 12) foram inseridos em blocos de osso artificial de densidades de 20 lb/ft3 (20 PCF) e 40 lb/ft3 (40 PCF). O torque máximo de inserção foi registrado por meio de um torquímetro digital. A resistência flexural foi avaliada nas deflexões de 2, 3 e 4 mm. Topografia de superfície e composição química dos MIs foram avaliadas por Microscopia Eletrônica de Varredura (MEV) e Espectroscopia de Energia Dispersiva de Raios X (EDS). Modelos lineares gerais e mistos foram utilizados para avaliar o efeito do tipo de MI, da densidade óssea e da deflexão nos desfechos avaliados. Resultados: O TI dos MIs-Ti foi 1,1 Ncm maior do que o obtido para os MIs-Ai (P = 0,018). O TI para MIs inseridos em blocos de teste de 40 PCF foi 5,4 Ncm maior do que para aqueles inseridos em blocos de teste 20 PCF (p < 0,001). MIs-Ai inseridos em osso de maior densidade (40 PCF) apresentaram resistência flexural significativamente maior do que outros grupos, em deflexões de 2 mm (98,7 ± 5,1 Ncm), 3 mm (112,0 ± 3,9 Ncm) e 4 mm (120,0 ± 3,4 Ncm) (p < 0,001). A MEV evidenciou fraturas nos MIs-Ti. A EDS revelou incorporação de 18% de C e 2,06% de O nos MIs-Ai e 3,91% de C nos MIs-Ti, ambos submetidos a testes mecânicos. Conclusões: Com base nos resultados desse estudo in vitro, os MIs-Ai aparentam oferecer adequada estabilidade e maior resistência mecânica, em comparação aos MIs-Ti, quando inseridos em osso de maior densidade.

Methodological Quality of Systematic Reviews Addressing Orthodontic Interventions: Methodological Study

ABSTRACT Objective: To assess the methodological quality and characteristics of systematic reviews (SRs) of interventional studies in orthodontics and assess how the certainty of the evidence is reported using the GRADE approach. Material and Methods: Six electronic databases were searched, followed by a hand search of the reference lists of eligible studies (PROSPERO #CRD42020180852). The required study design was randomized and nonrandomized studies of interventions published between January 2019 and May 2020. The Assessing the Methodological Quality of Systematic Reviews (AMSTAR 2) tool was used for the quality appraisal of the included SRs. Paired reviewers independently screened the studies, extracted data, and appraised the methodological quality. Results: The study included 46 SRs; 19.5% had moderate to high methodological quality, and the remaining had low to critically low methodological quality. Fifty-four percent of the reviews assessed the certainty of evidence using the GRADE approach, and 34.8% followed all GRADE criteria. Conclusion: Most reviews had a good judgment of the AMSTAR2 items, although some critical items contributed to decreased overall quality. Half of the reviews used the GRADE approach to assess the certainty of the evidence, and this approach should be included in future systematic reviews of interventions.

Meta-analysis of the efficacy of invisible orthodontic appliances for maxillary molar distalization in adult patients / 口腔疾病防治

Objective@#To evaluate the clinical efficacy of invisible orthodontic appliances without brackets for the distal movement of maxillary molars to improve the ability of orthodontists to predict treatment outcomes.@*Methods@#Web of Science, Cochrane Library, Embase, PubMed, Wanfang Database, CNKI Database, and VIP Database were searched for studies investigating the efficacy of invisible orthodontic appliances for distal movement of maxillary molars in adult patients and published from database inception to August 1, 2023. A total of three researchers screened the studies and evaluated their quality and conducted a meta-analysis of those that met quality standards.@*Results@#This study included 13 pre- and postcontrol trials with a total sample size of 281 patients. The meta-analysis revealed no significant differences in the sagittal or vertical parameters of the jawbone after treatment when compared with those before treatment (P>0.05). The displacement of the first molar was MD=-2.34, 95% CI (-2.83, -1.85); the displacement was MD=-0.95, 95% CI (-1.34, -0.56); and the inclination was MD=-2.51, 95% CI (-3.56, -1.46). There was a statistically significant difference in the change in sagittal, vertical, and axial tilt of the first molar before and after treatment. After treatment, the average adduction distance of the incisors was MD=-0.82, 95% CI (-1.54, -0.09), and the decrease in lip inclination was MD=-1.61, 95% CI (-2.86, -0.36); these values were significantly different from those before treatment (P<0.05).@*Conclusion@#Invisible orthodontic appliances can effectively move the upper molars in a distal direction and control the vertical position of the molars. When the molars move further away, there is some degree of compression and distal tilt movement, which is beneficial for patients with high angles. The sagittal movement of incisors is beneficial for improving the patient's profile.

Tempo de tratamento ortodôntico com aparelhos autoligados: revisão de literatura

Introdução: Atualmente, braquetes autoligados têm sido sugeridos para reduzir o tempo de tratamento na Ortodontia. Objetivo: Dessa maneira, o presente estudo objetivou revisar a literatura acerca do tempo de tratamento com esses braquetes, em comparação com outros braquetes e tratamentos sugeridos. Revisão de literatura: Foi realizada pesquisa bibliográfica de caráter descritivo, que compreendeu o levantamento de referencial teórico na base de dados eletrônica Medline ­ PubMed. A seleção de artigos foi feita a partir dos títulos e resumos e a revisão compreendeu 4 artigos publicados na língua inglesa no período de 2019 a 2023. Conclusão: Há uma escassez de estudos clínicos envolvendo essa temática e o tratamento ortodôntico com aparelhos autoligados parece apresentar menor tempo de tratamento em comparação com aparelhos fixos tradicionais. No entanto, os estudos não mostraram diferenças estatisticamente significativas na redução desse tempo. Pode-se sugerir que mais estudos clínicos sejam conduzidos no intuito de elucidar essa questão.

Introduction: Currently, self-ligating brackets have been suggested to reduce treatment time in Orthodontics. Objective: Therefore, the present study aimed to review the literature about the treatment time with these brackets, in comparison with other brackets and suggested treatments. Literature review: Descriptive bibliographical research was carried out, which included the survey of theoretical references in the electronic database Medline ­ PubMed. The selection of articles was made based on titles and abstracts and the review comprised 4 articles published in the English language from 2019 to 2023. Conclusion: there is a shortage of clinical studies involving this topic and orthodontic treatment with self-ligating appliances seems to present shorter treatment time compared to traditional fixed appliances. However, the studies did not show statistically significant differences in reducing this time. It can be suggested that more clinical studies be conducted to elucidate this issue.

Histological Evaluation of the Effect of Alendronate on the Maxillary Bone of Wistar Rats Combined with Orthodontic Movement of Intense Force / Evaluación Histológica del Efecto del Alendronate en el Hueso Maxilar de Ratas Wistar Combinado con Movimiento de Ortodoncia de Fuerzas Intensas

SUMMARY: To evaluate the histological adverse effects of alendronate administered systemically and topically in combination with orthodontic movement by intense force. Thirty-six 24-week-old female Wistar rats, ovariectomized, were used and divided into three groups (n = 12/group): control, locally treated with saline (0.07 ml/kg/week) (group 1) and experimental, treated with alendronic acid systemically (0.07 mg/kg/week) (group 2) and locally (7 mg/kg/week) (group 3). At 14 days, an orthodontic anchor was installed in the right first molar, and a force of 144 cN was applied for 28 days. The samples were processed for histological evaluation. Descriptive statistics, Shapiro-Wilk tests, one-way ANOVA with Bonferroni correction, one-way repeated measures ANOVA and chi-square tests were performed. All tests were statistically significant at p <0.05. The adverse events found in all groups were inflammation and osteoclastic activity. In the bisphosphonate-treated groups, there were statistically significant differences (p = 0.005) in the osteoclastic activity between the two hemiarcates. All rats in group 2 presented paralytic ileus. Compared to local administration, systemic treatment with alendronic acid produces more adverse effects, such as inflammation, fibrinoid necrosis, and osteoclastic activity. During the application of intense forces, it was not possible to show that there is necrosis associated with bisphosphonates.

Evaluar los efectos adversos histológicos del alendronato administrado sistémica y tópicamente en combinación con movimientos ortodóncicos de fuerza intensa. Treinta y seis ratas Wistar hembras de 24 semanas de edad, ovariectomizadas, fueron utilizadas y divididas en tres grupos (n = 12/grupo): control, tratado localmente con solución salina (0,07 ml/kg/semana) (grupo 1) y experimental, tratados con ácido alendrónico por vía sistémica (0,07 mg/kg/semana) (grupo 2) y local (7 mg/kg/semana) (grupo 3). A los 14 días se instaló un anclaje de ortodoncia en el primer molar derecho y se aplicó una fuerza de 144 cN durante 28 días. Las muestras fueron procesadas para evaluación histológica. Se realizó estadística descriptiva, pruebas de Shapiro-Wilk, ANOVA de una vía con corrección de Bonferroni, ANOVA de medidas repetidas de una vía y pruebas de chi-cuadrado. Todas las pruebas fueron estadísticamente significativas con un p <0,05. Los eventos adversos encontrados en todos los grupos fueron inflamación y actividad osteoclástica. En los grupos tratados con bisfosfonatos hubo diferencias estadísticamente significativas (p = 0,005) en la actividad osteoclástica entre los dos hemiarcados. Todas las ratas del grupo 2 presentaron íleo paralítico. En comparación con la administración local, el tratamiento sistémico con ácido alendrónico produce más efectos adversos, como inflamación, necrosis fibrinoide y actividad osteoclástica. Durante la aplicación de fuerzas intensas, no fue posible demostrar que existe necrosis asociada con los bisfosfonatos.

Analgesia por láser de baja potencia en pacientes con tratamiento ortodóncico / Low power laser analgesia in patients with orthodontic treatment i: en

Introducción: El dolor es el síntoma más común luego de la primera activación de la aparatología ortodóncica. El tratamiento analgésico más utilizado es el paracetamol; sin embargo, su uso inhibe la actividad de la ciclooxigenasa y la síntesis de prostaglandinas, lo que puede afectar el mecanismo del movimiento dental y el remodelado óseo. Objetivo: Evaluar la efectividad del láser de baja potencia para el alivio del dolor en pacientes con tratamiento ortodóntico. Métodos: Se realizó un estudio cuasiexperimental de intervención terapéutica, desde enero hasta diciembre de 2020, en 40 pacientes atendidos en la consulta de ortodoncia del Hospital General Docente Dr. Juan Bruno Zayas Alfonso de Santiago de Cuba, en quienes se aplicaría fuerza ortodóncica por primera vez. Estos fueron distribuidos de forma aleatoria en 2 grupos de 20 integrantes cada uno: el de estudio, tratado con láser de baja potencia, y el de control, que recibió medicación convencional (paracetamol). Para la validación estadística de la información se emplearon el porcentaje y la prueba de la t de Student para muestras independientes, con 95 % de confiabilidad. Resultados: Luego de tres sesiones terapéuticas, 90,0 % del grupo de estudio refirió no presentar dolor o sentirlo de forma leve, mientras que del grupo de control solo 10,0 % de los pacientes fue ubicado en cualquiera de las dos categorías anteriores. Existió diferencia significativa entre ambos grupos (p=0,00). Conclusiones: Se demostró que el láser, como terapia alternativa, fue más efectivo que el paracetamol.

Introduction: Pain is the most common symptom after the first activation of orthodontic appliance. The most widely used analgesic treatment is paracetamol; however, its use inhibits cyclooxygenase activity and prostaglandin synthesis, which can affect the mechanism of tooth movement and bone remodeling. Objective: To evaluate the effectiveness of low power laser for pain relief in patients with orthodontic treatment. Methods: A quasi-experimental study of therapeutic intervention was carried out, from January to December 2020, in 40 patients treated at the orthodontic clinic of Dr. Juan Bruno Zayas Alfonso Teaching General Hospital in Santiago de Cuba, in whom orthodontic force was applied for the first time. These were randomly distributed into 2 groups of 20 members each: the study group, treated with low-power laser, and the control group, that received conventional medication (paracetamol). For statistical validation of data, the percentage and the Student's t test for independent samples were used, with 95 % confidence interval. Results: After three therapeutic sessions, 90.0% of the study group reported not presenting pain or feeling it slightly, while only 10.0% of patients in control group were put in any of the two previous categories. There was a significant difference between both groups (p=0.00). Conclusions: Laser, as an alternative therapy, was shown to be more effective than paracetamol.

Evidencia de la efectividad del uso de aparatología ortopédica prequirúrgica en pacientes con labio y paladar hendido: revisión sistemática / Evidence of the effectiveness of the use of presurgical orthopedic appliances in patients with cleft lip and palate: a systematic review

Resumen El objetivo de este artículo fue evaluar la evidencia sobre el uso de una aparatología ortopédica prequirúrgica (AOP) en pacientes con labio y paladar hendido. Se realizó una búsqueda en las siguientes bases de datos: Medline/PubMed, Google Scholar, Clinical Trails.gov, ProQuest y Web of Science. En la búsqueda, se encontraron 7.926 registros, de los cuales se analizaron 105 artículos de texto completo; de éstos se incluyeron 23 estudios en pacientes con uso de AOP, asi como su grupo control sin el uso del AOP, previo al mismo tipo de cirugía. Los aparatos más utilizados para la AOP en el manejo de LPH fueron: el paladar pasivo (Paladar de Hotz), el modelador nasolaveolar (NAM), aparato McNeil y por último el T-traction; los principales desenlaces evaluados fueron: la estética facial y apariencia nasal; la evaluación de medidas cefalométricas, de vías aéreas superiores, nasales, del ancho de la fisura y así como puntos de referencia anatómicos como la distancia inter-canina e inter-tuberosidad. Además, se encontraron estudios que evaluaron oclusión y la fonación. La evidencia de esta literatura sugiere que el uso de aparatos activos tiene un mejor efecto que la placa pasiva, en términos de estética facial y aproximación de los segmentos maxilares para el cierre de la fisura. Sin embargo, la heterogeneidad, el riesgo de sesgo y la baja calidad de los estudios no permite tener conclusiones sólidas.

Abstract This review article aimed to evaluate the evidence on the use of a presurgical orthopedic appliance (POP) in patients with cleft lip and palate. The search was conducted using Medline/PubMed, Scholar Google, Clinical Trails, ProQuest, Scopus, and Web of Science databases. During the search, 7,926 records were found, of which 105 full-text articles were analyzed, and 23 studies included analysis in patients with the use of POP, and their control groups without the use of POP prior to the same type of surgery. The devices most used for POP in the management of LPH were: the passive palate (Hotz palate), the nasolaveolar moulding (NAM), the McNeil device, and finally, the T-traction. The primary outcomes evaluated were: facial aesthetics and nasal appearance; the evaluation of cephalometric measurements, upper airways, nasal fissure width, as well as anatomical references such as inter-canine and intertuberosity distances. In addition, studies that evaluated occlusion and phonation were found. The evidence from this literature suggests that the use of active appliances had a better effect than passive appliances in terms of facial aesthetics and approximation of the maxillary segments for the closure of the fissure. However, the heterogeneity, the risk of bias, and the low quality of the studies do not allow to state firm conclusions.

Alignment efficiency and three-dimensional assessment of root resorption after alignment with conventional and copper-nickel-titanium archwires: A randomized controlled trial

ABSTRACT Objective: To compare alignment efficiency and root resorption between nickel-titanium (NiTi) and copper-nickel-titanium (CuNiTi) archwires after complete alignment in mandibular anterior region. Methods: In this two-arm parallel single-blind randomized controlled trial, forty-four patients with Class I malocclusion with mandibular anterior crowding were recruited form orthodontic clinic of All India Institute of Medical Sciences (Jodhpur, India). Patients were randomly allocated into NiTi and CuNiTi groups, with a 1:1 allocation. Alignment was performed using 0.014-in, 0.016-in, 0.018-in, 0.019x0.025-in archwire sequence in the respective groups, which terminated in 0.019 x 0.025-in stainless-steel working archwire. The primary outcome was alignment efficiency, measured on study models from baseline (T0) to the first, second, third, fourth and fifth-month (T5). Secondary outcome was root resorption, measured from CBCT scans taken at T0 and T5. Mixed-factorial ANOVA was used to compare Little's Irregularity Index (LII). For assessing the proportion of patients with complete alignment at the end of each month, Kaplan-Meier survival curve was built and time to treatment completion was compared between groups using log rank test. Paired t-test was used to assess external apical root resorption (EARR) within groups, whereas independent t-test was used to evaluate LII and EARR between the groups. Results: Twenty-two patients were recruited in each group. One patient was lost to follow-up in the CuNiTi group. No statistically significant differences were observed in alignment efficiency between the groups (p>0.05). Intergroup comparison revealed that the changes in root measurement in three-dimensions were not statistically significant (p>0.05), except for mandibular right central incisor, which showed increased resorption at root apex in NiTi group (p<0.01). Conclusion: The two alignment archwires showed similar rate of alignment at all time points. Root resorption measurement did not differ between the NiTi and CuNiTi groups, except for the mandibular right central incisor, which showed more resorption in NiTi group.

RESUMO Objetivo: Comparar os fios de níquel-titânio (NiTi) e de cobre-níquel-titânio (CuNiTi) quanto à eficiência do alinhamento e quantidade de reabsorção radicular, após alinhamento completo dos dentes da região anterior inferior. Métodos: Neste estudo clínico randomizado, cego, paralelo, de dois braços, quarenta e quatro pacientes com má oclusão Classe I e apinhamento anterior inferior foram recrutados na clínica ortodôntica do All India Institute of Medical Sciences (Jodhpur, India). Os pacientes foram alocados aleatoriamente nos grupos NiTi e CuNiTi, na proporção de 1:1. O alinhamento foi realizado usando a sequência de fios 0,014", 0,016", 0,018" e 0,019" x 0,025" nos respectivos grupos, finalizando com o arco de trabalho 0,019" x 0,025" de aço inoxidável. O desfecho primário foi a eficiência do alinhamento, medida nos modelos de estudo nos tempos inicial (T0) e após um, dois, três, quatro e cinco meses (T5). O desfecho secundário foi a reabsorção radicular, medida a partir de tomografias computadorizadas realizadas em T0 e T5. ANOVA fatorial mista foi utilizada para comparar o Índice de Irregularidade de Little (IIL). Para avaliar a proporção de pacientes com alinhamento completo ao fim de cada mês, foi construída uma curva de sobrevida pelo método de Kaplan-Meier, e o tempo até o fim do tratamento foi comparado entre os grupos por meio do teste log-rank. Um teste t pareado foi utilizado para avaliar a reabsorção radicular apical externa (RRAE) dentro dos grupos, enquanto um teste t independente foi utilizado para avaliar o IIL e a RRAE entre os grupos. Resultados: Vinte e dois pacientes foram recrutados em cada grupo. Um paciente perdeu o acompanhamento no grupo CuNiTi. Não foram observadas diferenças estatisticamente significativas entre os grupos quanto à eficiência do alinhamento (p>0,05). A comparação intergrupos revelou que as alterações na RRAE medida em três dimensões não foram estatisticamente significativas (p>0,05), exceto para o incisivo central inferior direito, que apresentou aumento da RRAE no grupo NiTi (p<0,01). Conclusão: Os dois tipos de fios de alinhamento apresentaram taxa de alinhamento semelhante em todos os momentos. A medida da reabsorção radicular não diferiu entre o grupo NiTi e CuNiTi, exceto para o incisivo central inferior direito, que apresentou maior reabsorção no grupo NiTi.

Cambios dento-esqueléticos de un paciente con síndrome clase III de Moyers tratado con bloques gemelos

La finalidad de la ortopedia dentofacial consiste en modificar el patrón de crecimiento facial y de las estructuras óseas subyacentes de la cara, como la de los pacientes con síndrome clase III de Moyers. El objetivo de este trabajo es dar a conocer los cambios dento-esqueléticos de un paciente con síndrome clase III de Moyers tratado con bloques gemelos. Se presenta el caso de un paciente masculino de 9 años de edad que acudió a consulta de Ortodoncia de la Clínica Universitaria de Especialidades Estomatológicas "Manuel Cedeño" en abril de 2019, preocupado su papá por la estética del paciente. Mediante el análisis de modelos de estudio, las mediciones cefalométricas y los hallazgos del examen físico se clasificó al paciente como síndrome clase III de Moyers. Se empleó los bloques gemelos clase III como aparato de ortopedia funcional de los maxilares. Los resultados dento-esqueléticos se determinaron a los cuatro meses de iniciada la terapia funcional. Luego del tratamiento se concluyó que con el uso de los bloques gemelos clase III los resultados fueron favorables pues se corrigió la relación de oclusión dentaria y se logró una clase I esquelética máxilo-mandibular.

The purpose of dentofacial orthopedics is to modify the pattern of facial growth and the underlying bone structures of the face, such as that of patients with Moyers class III syndrome. The objective of this work is to present the dento-skeletal changes of a patient with Moyers class III syndrome treated with twin blocks. The case of a 9-year-old male patient who attended the orthodontic consultation of the University Clinic of Stomatological Specialties "Manuel Cedeño" in April 2019 is presented, his father worried about the aesthetics of the patient. By analyzing study models, cephalometric measurements and physical examination findings, the patient was classified as Moyers class III syndrome. Class III twin blocks were used as a functional maxillary orthopedic device. Dento-skeletal results were determined four months after the start of functional therapy. After the treatment, it was concluded that with the use of the class III twin blocks, the results were favorable because the dental occlusion relationship was corrected and a skeletal maxillo-mandibular class I was achieved.

O objetivo da ortopedia dentofacial é modificar o padrão de crescimento facial e as estruturas ósseas subjacentes da face, como a de pacientes com síndrome de Moyers classe III. O objetivo deste trabalho é apresentar as alterações dentoesqueléticas de um paciente com síndrome de Moyers classe III tratado com blocos gêmeos. É apresentado o caso de um paciente do sexo masculino de 9 anos que compareceu à consulta de Ortodontia da Clínica Universitária de Especialidades Estomatológicas "Manuel Cedeño" em abril de 2019, seu pai preocupado com a estética do paciente. Analisando modelos de estudo, medidas cefalométricas e achados do exame físico, o paciente foi classificado como síndrome de Moyers classe III. Blocos gêmeos Classe III foram usados ​​como um dispositivo ortopédico funcional para os maxilares. Os resultados dentoesqueléticos foram determinados quatro meses após o início da terapia funcional. Após o tratamento concluiu-se que com o uso de blocos gêmeos classe III os resultados foram favoráveis, pois a relação de oclusão dentária foi corrigida e uma classe I esquelética maxilomandibular foi alcançada.

Stress distribution in lower second molar mesialization using mini-implants: a pilot study using 3D finite element analysis / Distribuição de tensões na mesialização do segundo molar inferior usando mini-implantes: um estudo piloto usando análise de elementos finitos 3D

Objective: to analyze the stress distribution in a 3D model that simulates second molar mesialization using two different types of mini-implants. Material and Methods: a mandible bone model was obtained by recomposing a computed tomography performed by a software program. The cortical and trabecular bone, a lower second molar, periodontal ligament, orthodontic tube, resin cement and the mini-implants were designed and modeled using the Rhinoceros 4.0 software program. The characteristics of self-drilling orthodontic mini-implants were: one with 7 mm length, 1 mm transmucosal neck section and 1.6 mm diameter and another with 5 mm length and 1.5 mm diameter. A total of 235.161 and 224.505 elements were used for the mesh. These models were inserted into the bone block and then subjected to loads of 200 cN (centinewton). The results were calculated and analyzed by the Ansys 17.0 software program for qualitative verification through displacement and maximum principal stress maps. Results: it was possible to observe that the periodontal ligament presented low displacement and stress values. However, the physiological values presented are among those capable to provide orthodontic movement, with compression and tensile area visualization staggered between 0.1 and -0.1 MPa (megapascal). Conclusion: within the limitations of the study, the mini-implants tested showed similar results where the load on the tooth allowed dental displacement (molar mesialization), with a tendency to rotate it, theoretically allowing the second molar to take the location of the first molar. (AU)

Objetivo: analisar a distribuição de tensões em um modelo 3D que simula a mesialização do segundo molar usando dois tipos diferentes de mini-implantes. Material e Métodos: um modelo de osso mandibular foi obtido por recomposição de uma tomografia computadorizada realizada por um software. O osso cortical e trabecular, um segundo molar inferior, ligamento periodontal, tubo ortodôntico, cimento resinoso e os mini-implantes foram projetados e modelados no software Rhinoceros 4.0. As características dos mini-implantes ortodônticos auto perfurantes foram: um com 7 mm de comprimento, 1 mm de secção transmucosa e 1,6 mm de diâmetro e outro com 5 mm de comprimento e 1,5 mm de diâmetro. Para a malha, foram utilizados 235.161 e 224.505 elementos. Esses modelos foram inseridos no bloco ósseo e então submetidos a cargas de 200 cN (centinewton). Os resultados foram calculados e analisados pelo software Ansys 17.0 para verificação qualitativa por meio de mapas de deslocamento e tensões máximas principais. Resultados: foi possível observar que o ligamento periodontal apresentou baixos valores de deslocamento e tensões. Porém, os valores fisiológicos apresentados são capazes de proporcionar movimentação ortodôntica, com visualização da área de compressão e tração escalonada entre 0,1 e -0,1 MPa (megapascal). Conclusão: dentro das limitações do estudo, os mini-implantes testados apresentaram resultados semelhantes onde a carga sobre o dente permitiu o deslocamento dentário (mesialização do molar), com tendência a girá-lo, permitindo teoricamente que o segundo molar ocupe do lugar do primeiro molar (AU)

Analysis of biofilm formation by Candida albicans in different types of orthodontic fixed appliances and devices / Análise da formação de biofilme por Candida albicans em diferentes tipos de aparelhos e dispositivos ortodônticos fixos

Objective: in this study, biofilm formation by Candida albicans in fixed orthodontic appliances was evaluated. Material and Methods: a total of 300 conventional metal brackets (MC), ceramic (CB), self-ligation (SLB), nickel-titanium (NiTi), and nickel-chromium (NiCr) wires, and ligatures types were organized into thirty groups (n=10). To induce biofilm formation, brackets, wires, and ligatures were joined, sterilized, placed in 24-well plates, contaminated with standardized suspensions of C. albicans (107 cells/mL), and incubated at 37 °C for 48 h with shaking. The biofilms formed were detached using an ultrasonic homogenizer, and suspensions were serially diluted and plated on Sabouraud dextrose agar to determine colony-forming units per mL. Scanning electron microscopy was performed before and after the biofilm formation. Results: lower amount of biofilm formation was observed in the MC group than in the CB and SLB groups (p<0.0001). SLB and CB showed similar biofilm formation rates (p=0.855). In general, the cross-sectional wires .018"x.025" showed higher biofilm formation when associated with the three types of brackets. When brackets, wires, and ligatures were associated, the sets with NiCr wires and SSL ligatures with MC brackets (p=0.0008) and CB (p=0.0003) showed higher biofilm formation. Conclusion: thus, brackets of MC with NiTi and NiCr wires showed lower biofilm formation, regardless of the ligature and cross-sectional or gauge of the wire and, MC and CB brackets with NiCr wires and SSL ligatures were more likely to accumulate biofilms (AU)

Objetivo: neste estudo, a formação de biofilme por Candida albicans em aparelhos ortodônticos fixos foi avaliada. Material e Métodos: um total de 300 bráquetes metálicos convencionais (MC), cerâmicos (CB), autoligados (SLB), com fios de níquel-titânio (NiTi) e níquel-cromo (NiCr) e tipos de ligaduras foram organizados em trinta grupos (n=10). Bráquetes, fios e ligaduras foram unidos, esterilizados, colocados em placas de 24 poços, contaminados com suspensões padronizadas de C. albicans (107 células/mL) e incubados a 37°C por 48 h para a formação de biofilmes. Os biofilmes formados foram rompidos por meio de um homogeneizador ultrassônico e suspensões foram diluídas e semeadas em ágar Sabouraud-dextrose para determinar as unidades formadoras de colônias por mL. A microscopia eletrônica de varredura foi realizada antes e após a formação do biofilme. Resultados: foi observada menor formação de biofilme no grupo MC em comparação aos grupos CB e SLB (p<0,0001). A formação de biofilme foi semelhante nos grupos SLB e CB (p=0,855). Em geral, os fios de seção transversal .018"x.025" apresentaram maior formação de biofilme quando associados aos três tipos de bráquetes. Os conjuntos com fios de NiCr e ligaduras SSL com bráquetes MC (p=0,0008) e CB (p=0,0003) apresentaram maior formação de biofilme. Conclusão: bráquetes MC com fios de NiTi e NiCr apresentaram menor formação de biofilme, independente da ligadura e secção transversal ou bitola do fio e, braquetes MC e CB com fios de NiCr e ligaduras SSL foram mais propensos a acumular biofilmes.(AU)

Mandibular advancement with clear aligners and functional appliances in the treatment of skeletal ClassⅡmalocclusion: a systematic review and meta-analysis / 华西口腔医学杂志

OBJECTIVES@#This study aimed to conduct a meta-analysis of the efficacy of mandibular advance clear alig-ners with traditional functional appliances as the control group.@*METHODS@#PubMed, Web of Science, Embase, Cochrane Library, China Biomedical Abstracts Database, China Knowledge Network Database, Wanfang Database, and Weipu Database were used in this study. The two groups of researchers screened the literature and extracted data based on the inclusion and exclusion criteria established by PICOS entries, and used the ROBINS-I scale for quality evaluation. Revman 5.4 and Stata 17.0 software were used for meta-analysis.@*RESULTS@#Nine clinical controlled trials were included in this study with a total sample size of 283 cases. No significant difference was found in SNA, SNB, ANB, Go-Pog, U1-SN, Overjet, and other aspects between the invisible group and the traditional group in the treatment of skeletal class Ⅱ ma-locclusion patients; there was a 0.90° difference in mandibular plane angle between the two groups; the growth of the mandibular ramus (Co-Go) in the traditional group was 1.10 mm more than that in the invisible group; the lip inclination of the lower teeth in the invisible group was better controlled, 1.94° less than that in the control group.@*CONCLUSIONS@#The invisible group can better control the lip inclination of the mandibular anterior teeth when guiding the mandible. Furthermore, the mandibular plane angle (MP-SN) can remain unchanged, but the growth of the mandibular ramus is not as good as the traditional group, and auxiliary measures should be taken to improve it in clinical practice.

Cambios en el pH salival de pacientes con ortodoncia fija, tras la aplicación de dos tipos de enjuagues bucales / Changes in salivary pH in patients with fixed orthodontics following the use of two types of mouthwashes

Introducción: Los enjuagues bucales contribuyen a la inhibición de la formación de la placa bacteriana y, por tanto, pueden ayudar a mantener el pH salival cercano a neutro. Objetivo: Identificar cambios en el pH salival de pacientes portadores de aparatología ortodóncica fija, después del enjuague con una solución de Stevia rebaudiana Bertoni y un enjuague comercial de aceites esenciales. Métodos: Se realizó un experimento clínico con un diseño factorial mixto en pacientes portadores de aparatología ortodóncica fija. Una vez firmado el consentimiento informado, treinta y dos pacientes fueron asignados aleatoriamente a uno de 2 grupos: la solución de S. rebaudiana B. al 2 por ciento o un enjuague comercial de aceites esenciales. Se utilizaron 15 ml de enjuague durante 60 s en todos los pacientes. El pH salival fue medido por dos observadores independientes calibrados, utilizando papel medidor de pH antes del enjuague (medición basal) y después del enjuague, a los 5 y 20 min. Los datos fueron analizados mediante el ANOVA mixto. Resultados: Se encontró una interacción estadísticamente significativa entre el tipo de tratamiento y el momento de medición del pH. Los pH medio de los grupos S. rebaudiana y aceites esenciales fueron respectivamente en la medición basal: 6,61 y 6,52 (p = 0,72); a los 5 min: 7,61 y 7,77 (p = 0,40); y a los 20 min: 7,72 y 6,82 (p < 0,001). Conclusiones: Ambos enjuagues tenían el efecto de aumentar el pH salival a niveles alcalinos a los 5 min, pero solo el enjuague de S. rebaudiana B. al 2 por ciento mantuvo el pH básico a los 20 min(AU)

Introduction: Mouthwashes contribute to the inhibition of bacterial plaque formation and, therefore, may help to maintain salivary pH close to neutral. Objective: To identify changes in salivary pH in patients with fixed orthodontics after using a Stevia rebaudiana Bertoni solution and a commercial essential oil mouthwash. Methods: A clinical experiment with a mixed factorial design was carried out in patients with fixed orthodontic appliances. Once informed consent was signed, thirty-two patients were randomly assigned to one of 2 groups: 2 % S. rebaudiana B. solution or a commercial essential oil mouthwash. Fifteen ml of mouthwash was used for 60 s in all patients. Salivary pH was measured by two independent calibrated observers using pH-measuring paper before rinsing (basal measurement) and after rinsing, after 5 and 20 min. The data were analyzed by mixed ANOVA. Results: A statistically significant interaction was found between the type of treatment and the time of pH measurement. The medium pH of the S. rebaudiana and essential oil groups were respectively as per basal measurement: 6.61 and 6.52 (p = 0.72); after 5 min: 7.61 and 7.77 (p = 0.40); and after 20 min: 7.72 and 6.82 (p < 0.001). Conclusions: Both mouthwashes had the effect of increasing salivary pH to alkaline levels after 5 min, but only the 2 percent S. rebaudiana B. mouthwash maintained the basic pH after 20 min(AU)

Los bloques gemelos en el tratamiento de las maloclusiones clase III. Revisión / Twin blocks in the treatment of class III malocclusions. Review / Blocos gêmeos no tratamento das más oclusões de classe III. Revisão

RESUMEN El tratamiento de las maloclusiones clase III en pacientes en crecimiento suele realizarse con aparatos de ortopedia intraoral o extraoral. El objetivo fue analizar el uso de los bloques gemelos en el tratamiento de las maloclusiones de clase III. Se realizó una revisión sistemática siguiendo los lineamientos PRISMA versión 2009. Las búsquedas se realizaron en las bases de datos Pubmed, Embase, Scopus y Cochrane, así como en una base de datos de literatura gris, y se complementaron con búsquedas manuales. Se incluyeron cinco artículos de los cuales se registraron las siguientes variables: autor, año de publicación, país y resultados. De acuerdo a la bibliografía revisada, los bloques gemelos clase III constituyen una opción terapéutica que producen una mejoría de la estética facial al modificarse la relación esquelética máxilomandibular, la relación de oclusión dentaria anterior y la posición de los tejidos blandos.

ABSTRACT Treatment of class III malocclusions in growing patients is usually performed with intraoral or extraoral braces. The objective was to analyze the skeletal changes by treating class III malocclusions with twin blocks. A systematic review was carried out following the PRISMA 2009 version guidelines. Searches were carried out in the Pubmed, Embase, Scopus and Cochrane databases, as well as in a gray literature database, and were supplemented by hand searches. Five articles were included, of which the following variables were recorded: author, year of publication, country, and results. According to the reviewed bibliography, class III twin blocks constitute a therapeutic option that produces an improvement in facial aesthetics by modifying the maxillomandibular skeletal relationship, the anterior dental occlusion relationship, and the position of the soft tissues.

RESUMO O tratamento das más oclusões de classe III em pacientes em crescimento geralmente é realizado com aparelho intraoral ou extraoral. O objetivo foi analisar o uso de blocos gêmeos no tratamento das más oclusões de classe III. Uma revisão sistemática foi realizada seguindo as diretrizes do PRISMA versão 2009. As pesquisas foram realizadas nos bancos de dados Pubmed, Embase, Scopus e Cochrane, bem como em um banco de dados de literatura cinza, e foram complementadas por pesquisas manuais. Foram incluídos cinco artigos, dos quais foram registradas as seguintes variáveis: autor, ano de publicação, país e resultados. De acordo com a bibliografia revisada, os bloqueios gêmeos de classe III constituem uma opção terapêutica que produz uma melhora na estética facial ao modificar a relação esquelética maxilomandibular, a relação de oclusão dentária anterior e a posição dos tecidos moles.

Effectiveness of chlorhexidine oral rinse in preventing plaque accumulation and gingivitis in patients undergoing orthodontic treatment- a systematic review and meta analysis / Eficacia del enjuague oral de clorhexidina en la prevención de la acumulación de placa y la gingivitis en pacientes en tratamiento de ortodoncia: una revisión sistemática y metaanálisis

Aim: The aim of this review was to systematically assess and report the effectiveness of chlorhexidine (CHX) mouthwash in preventing plaque accumulation and gingivitis in patients undergoing orthodontic treatment. Material and Methods: The review was prepared according to the Preferred Reporting Items for Systematic Reviews (PRISMA) guidelines and registered under PROSPERO database (CRD42020170776). Four electronic databases were systematically searched along with a complimentary manual search of orthodontic journals until June 2022. Only Randomized Control Trials (RCTs) reporting on antiplaque and antigingivitis efficacy of Chlorhexidine mouthwash compared with placebo or control in orthodontic patients were included. Risk of bias assessment was done using Cochrane ROB-2. Quantitative analysis (Random-Effects Model and Standard Mean Difference (SMD)) with 95 % confidence interval was used. Results: Six RCTs were included for qualitative analysis and four were included for quantitative analysis with a total of 211 participants. Out of six studies, 3 were judged to have a low risk of bias, two had some concerns and one of them had high risk of bias. Random effects meta-analysis performed for anti-plaque effect reported a significant reduction of -1.2 SMD for CHX at 4 to 6 weeks with low heterogeneity (I2-35%). The anti-gingivitis effect at 4 to 6 weeks was significant for CHX with a SMD of -1.03 and a moderate heterogeneity (I2-65%). Conclusion: On analyzing the available evidence a moderate level of certainty supports a short-term reduction in plaque accumulation and gingivitis in orthodontic patients subjected to rinsing with chlorhexidine oral rinse.

Objetivo: El objetivo de esta revisión fue evaluar e informar sistemáticamente la efectividad del enjuague bucal con clorhexidina (CHX) para prevenir la acumulación de placa y la gingivitis en pacientes que reciben tratamiento de ortodoncia. Material y Métodos: La revisión se preparó de acuerdo con las pautas de Preferred Reporting Items for Systematic Reviews (PRISMA) y se registró en la base de datos PROSPERO (CRD42020170776). Se realizaron búsquedas sistemáticas en cuatro bases de datos electrónicas junto con una búsqueda manual gratuita de revistas de ortodoncia hasta junio de 2022. Solo se incluyeron ensayos controlados aleatorios (ECA) que informaron sobre la eficacia antiplaca y antigingivitis del enjuague bucal con clorhexidina en comparación con placebo o control en pacientes de ortodoncia. La evaluación del riesgo de sesgo se realizó mediante Cochrane ROB-2. Se utilizó un análisis cuantitativo (modelo de efectos aleatorios y diferencia de medias estándar (SMD)) con un intervalo de confianza del 95 %. Resultados: Se incluyeron seis ECA para el análisis cualitativo y cuatro para el análisis cuantitativo con un total de 211 participantes. De los seis estudios, se consideró que tres tenían un bajo riesgo de sesgo, dos tenían algunas preocupaciones y uno de ellos tenía un alto riesgo de sesgo. El metanálisis de efectos aleatorios realizado para el efecto antiplaca informó una reducción significativa de -1,2 SMD para CHX a las 4 a 6 semanas con baja heterogeneidad (I2-35%). El efecto antigingivitis a las 4 a 6 semanas fue significativo para CHX con una SMD de -1,03 y una heterogeneidad moderada (I2-65%). Conclusión: Al analizar la evidencia disponible, un nivel de certeza moderado apoya una reducción a corto plazo en la acumulación de placa y gingivitis en pacientes ortodóncicos sometidos a enjuague con enjuague bucal con clorhexidina.

Orthodontists' preferences in the use and timing of appliances for the correction of malocclusions in growing patients / Preferencias de los ortodoncistas en el uso y momento oportuno de uso de aparatos para la corrección de maloclusiones en pacientes en crecimiento

Objective: To evaluate orthodontists' preferences in the use and timing of appliances for the correction of Class II and Class III malocclusions in growing patients and the sociodemographic factors that influence these preferences. Material and Methods: Active members of the Colombian Orthodontics Society (SCO) were invited to complete a previously validated survey on the use of Class II and Class III correctors in growing patients. Results: 180 orthodontists responded (80 male, 100 female). The appliances used most frequently in the treatment of Class II malocclusion were Planas indirect tracks (32.78%) and Twin-blocks (30.56%). Facemasks (62.22%) and Progenie plates (25%) were the most prevalent appliances used in the treatment of Class III malocclusions. Regarding treatment timing, 52% of the orthodontists stated that Class II malocclusions must be treated during late mixed dentition or early permanent dentition, 42% stated that treatment for Class III malocclusions should occur during early mixed dentition. Appliance use and treatment timing were significantly associated with sex (p= 0.034), years of practice (p= 0.025), and area of work (private clinics or public institutions), (p= 0.039). Conclusion: Twin-blocks and Facemask appliances were the preferred appliances for Class II and Class III treatment, respectively, in growing patients. Most of the orthodontists believed that Class II malocclusions must be treated during late mixed dentition and that Class III malocclusions must be treated during early mixed dentition. Sociodemographic variables are related factors that influence orthodontists' preferences in the use of these appliances.

Objetivo: Evaluar las preferencias de los ortodoncistas en el uso y momento oportuno de uso de aparatología para la corrección de maloclusiones Clase II y Clase III en pacientes en crecimiento y los factores sociodemográficos que influyen en estas preferencias. Material y Métodos: Se invitó a miembros activos de la Sociedad Colombiana de Ortodoncia (SCO) a completar una encuesta previamente validada, sobre el uso de correctores para Clase II y Clase III en pacientes en crecimiento. Resultados: Respondieron un total de 180 ortodoncistas (80 hombres, 100 mujeres). La aparatología más utilizada en el tratamiento de las maloclusiones de Clase II fueron pistas indirectas de Planas (32,78%) y bloques gemelos (30,56%). La máscara facial (62,22%) y las placas progenie (25%) fueron los aparatos más utilizados en el tratamiento de las maloclusiones de Clase III. En cuanto al momento oportuno del tratamiento, el 52% de los ortodoncistas afirmó que las maloclusiones de Clase II deben tratarse durante la dentición mixta tardía o la dentición permanente temprana, el 42% afirmó que el tratamiento para las maloclusiones de Clase III debe ocurrir durante la dentición mixta temprana. El uso de aparatos y el momento oportuno del tratamiento se asociaron significativamente con el sexo (p= 0,034), los años de práctica (p= 0,025) y el área de trabajo (clínicas privadas o instituciones públicas) (p= 0,039). Conclusión: Los aparatos bloques gemelos y la máscara facial fueron los preferidos para el tratamiento de Clase II y Clase III, respectivamente, en pacientes en crecimiento. La mayoría de los ortodoncistas consideran que las maloclusiones de Clase II deben tratarse durante la dentición mixta tardía y que las maloclusiones de Clase III deben tratarse durante la dentición mixta temprana. Las variables sociodemográficas son factores relacionados que influyen en las preferencias de los ortodoncistas en el uso de estos aparatos.

Efectividad del Bionator de California en la disminución del grado de severidad de los trastornos temporomandibulares / Effectiveness of the California Bionator in reducing the degree of severity of temporomandibular disorders

RESUMEN Fundamento: Existen modalidades de tratamiento para los trastornos temporomandibulares, una de ellas es la Ortopedia funcional de los maxilares. Objetivo: Evaluar la efectividad del Bionator de California en la disminución del grado de severidad de los trastornos temporomandibulares. Metodología: Se realizó estudio experimental, abierto, controlado y aleatorizado en el servicio de Prótesis Estomatológica de la Clínica Estomatológica de Fomento en el período de septiembre de 2019 a septiembre de 2021. Se seleccionaron 60 pacientes con trastornos temporomandibulares que cumplieron los criterios de selección, mediante asignación aleatoria se establecieron los grupos: Estudio (tratado con Bionator de California) y control (tratado con férula neuromiorrelajante). Se utilizaron métodos del nivel teórico, empírico y estadístico. La variable de respuesta principal fue: Efectividad del Bionator de California en el grado de severidad del trastorno temporomandibular. Resultados: Al inicio del estudio predominó la severidad moderada de trastornos temporomandibulares en ambos grupos, pero a los 6 meses de tratamiento predominaron los asintomáticos (66.7 %) en el grupo estudio y 36.7 % en el grupo control, con diferencia estadísticamente significativa entre ambos grupos. Conclusiones: El tratamiento con el Bionator de California fue efectivo porque se logró disminuir el grado de severidad de los trastornos temporomandibulares.

ABSTRACT Background: There are treatment modalities for temporomandibular disorders, one of them is functional orthopedics of the jaws. Objective: To evaluate the effectiveness of the California Bionator in reducing the degree of severity of temporomandibular disorders. Methodology: An experimental, open, controlled and randomized study was carried out in the Dental Prosthesis service at Fomento Dental Clinic from September 2019 to September 2021. 60 patients with temporomandibular disorders who met the selection criteria were selected. The groups were established by random assignment: Study (treated with Bionator from California) and control (treated with a neuromyorelaxant splint). Method theoretical, empirical and statistical levels were used. The main response variable was: Effectiveness of the California Bionator in the degree of severity of the temporomandibular disorder. Results: At the beginning of the study moderate severity of temporomandibular disorders prevailed in both groups, but after 6 months of treatment asymptomatic predominated (66.7%) in the study group and 36.7% in the control group, with a statistically significant difference between both groups. Conclusions: The treatment with the California Bionator was effective because the degree of severity of temporomandibular disorders was reduced.

Cephalometric evaluation of the cervical spine posture following fixed functional therapy with Forsus™ appliance

Background: To investigate whether fixed functional therapy for mandibular advancement with the Forsus™ appliance would produce any changes in the cervical spine posture. Materials and Methods: This prospective clinical exploratory study was conducted on 12 patients (six females and six males) with a mean age of 15 ± 1.3 years, having mandibular retrusion, Class II malocclusion, who were treated with the Forsus™ appliance. Lateral cephalogram was taken twice, once at the baseline (T1) before the commencement of the treatment and once following termination of fixed functional treatment (T2). Eleven measurements representing the vertical and the sagittal craniofacial proportions, and the head posture, were taken into account. Data were analyzed using SPSS version 22. The variations between before and after treatment measurements were collated using paired t-test. P < 0.05 was considered statistically significant. Results: No significant differences were noticed in the angle linking the horizontal lines of the head and the superior crest of the spinal column before and after the treatment, with P = 0.73. The cervical curvature angle also failed to show any significant difference with P = 0.14. Conclusion: Fixed functional therapy with the Forsus™ device resulted in dentoalveolar and soft tissue alterations alone but did not alter the cervical spine posture.