Bolton tooth size analysis in a sample of Sudanese adults / Análise de Bolton do tamanho dentário em uma amostra de adultos sudaneses

Introduction: A correct proportion between the upper and lower teeth is critical to achieving proper occlusal interdigitation, ideal overjet, and good molar intercuspation at the end of orthodontic treatment. Objectives: To determine the anterior and overall Bolton's ratio in the Sudanese population, investigate gender differences in tooth size ratios, and to compare these results with Bolton's original ratio norm. Material and Methods: The sample consisted of dental casts of 104 Sudanese University students with normal occlusion (52 females, 52 males), aged between 16-26 years randomly selected from AL- Neelain University. An electronic digital caliper was used to measure the mesiodistal tooth size of the maxillary and mandibular teeth anterior to the second molars. These measurements were then used to obtain Bolton's ratio. Mean, range, and standard deviation of the anterior and overall ratios were computed for each subject. T-Tests were used to compare gender differences and to investigate differences between the results of this study and Bolton's original ratio. Results: Anterior and overall Bolton ratios for males were 78.43 ± 2.44 and 93.901 ± 9.8 and for females were 78.29 ± 2.6 and 91.67 ± 3.3 percent, respectively. There were no statistically significant differences between males and females for the anterior and overall ratios (P>0.05). The anterior and overall Bolton's ratios among Sudanese University students were 78.37 ± 2.54, and 92.79 ± 7.43 percent, respectively. A statistically significant difference between this study and Bolton's study was found in both anterior and overall ratio (P≤ 0.05). Conclusion: Bolton's mean ratios may not be applicable to the Sudanese population. (AU)

Introdução: Uma proporção correta entre os dentes superiores e inferiores é crítica para alcançar a interdigitação oclusal adequada, overjet ideal e boa intercuspidação molar ao final do tratamento ortodôntico. Objetivos: determinar a proporção anterior e geral de Bolton na população sudanesa, investigar as diferenças de gênero nas proporções de tamanho dos dentes e comparar esses resultados com a norma original de Bolton. Material e Métodos: A amostra foi constituída por modelos de gesso de 104 universitários sudaneses com oclusão normal (52 mulheres, 52 homens), com idades entre 16-26 anos, selecionados aleatoriamente na Universidade AL-Neelain. Um paquímetro digital eletrônico foi usado para medir o tamanho mesiodistal dos dentes superiores e inferiores anteriores aos segundos molares. Essas medidas foram então usadas para obter o índice de Bolton. Média, intervalo e desvio padrão das relações anterior e geral foram calculados para cada amostra. Os testes t foram usados para comparar as diferenças de gênero e para investigar as diferenças entre os resultados deste estudo e a proporção original de Bolton. Resultados: Os índices de Bolton anterior e geral para homens foram 78,43 ± 2,44 e 93,901 ± 9,8 e para mulheres foram 78,29 ± 2,6 e 91,67 ± 3,3 por cento, respectivamente. Não houve diferenças estatisticamente significativas entre homens e mulheres para os índices anterior e geral (P> 0,05). Os índices de Bolton anterior e geral entre os estudantes da Universidade sudanesa foram 78,37 ± 2,54 e 92,79 ± 7,43 por cento, respectivamente. Uma diferença estatisticamente significativa entre este estudo e o estudo de Bolton foi encontrada na proporção anterior e geral (P≤ 0,05). Conclusão: os índices médios de Bolton podem não ser aplicáveis à população sudanesa (AU)

Necesidades de aprendizaje sobre la aplicación del índice de Bolton en residentes de ortodoncia / Learning needs about application of the Bolton Index by orthodontics residents

Introducción: La aplicación y el análisis del índice de Bolton es necesario para establecer un plan de tratamiento correcto en pacientes con maloclusiones dentarias. Los especialistas en formación deben adquirir y aplicar este conocimiento para el desarrollo adecuado de su práctica profesional. Objetivo: Evaluar las necesidades de aprendizaje en residentes de ortodoncia sobre el uso y la interpretación del índice de Bolton y sus factores potencialmente determinantes. Métodos: Estudio descriptivo de corte transversal con enfoque cualitativo-cuantitativo, mediante encuestas anónimas y entrevistas no estructuradas a residentes y profesores del departamento de ortodoncia de la Facultad de Estomatología de La Habana, durante el curso 2017-2018. Resultados: Los residentes encuestados presentaron conocimientos insuficientes sobre el índice de Bolton. Su aplicación no fue sistemática en la educación en el trabajo y las mayores deficiencias se observaron en segundo y tercer años. Los factores potencialmente determinantes revelados resultaron la falta de uniformidad y la exigencia a los estudiantes en la evaluación de los docentes. Conclusiones: Los residentes de ortodoncia deben elevar su nivel de conocimiento sobre el análisis del índice de Bolton e incrementar su aplicación práctica mediante un sistema evaluativo más exigente y metódico(AU)

Introduction: Application and analysis of the Bolton index is necessary to establish a correct treatment plan in patients with dental malocclusions. Training specialists must acquire and apply this knowledge for the proper development of their professional practice. Objective: To assess the learning needs of Orthodontics residents regarding the use and interpretation of the Bolton index and its potentially determining factors. Methods: Descriptive and cross-sectional study with a qualitative-quantitative approach, using anonymous surveys and non-structured interviews with residents and professors of the Department of Orthodontics at the Dental School in Havana, during the academic year 2017-2018. Results: The surveyed residents showed insufficient knowledge about the Bolton index. Its application was not systematic in education at work. The greatest deficiencies were observed in the second and third academic years. The potentially determining factors revealed were lack of uniformity and professors' being demanding for student evaluation. Conclusions: Orthodontics residents should increase their level of knowledge about analysis of the Bolton index and increase its practical application through a more demanding and methodical evaluation system(AU)

Comportamiento de proporciones divinas e índice de Bolton en mediciones dentales de individuos con maloclusión / Behavior of divine proportions and the Bolton's index in dental measurements of subjects with malocclusion

Los pacientes acuden cada vez con más frecuencia a los servicios estomatológicos en busca de mejorar su aspecto estético. Uno de los métodos más polémicos para el examen de la estética lo constituyen aquellos que se basan en el empleo de la proporción divina, esto motivó a la realización de este trabajo. Se evaluó el comportamiento de las proporciones divinas en mediciones dentales de individuos con maloclusión, mediante el empleo del índice de Bolton. Se realizó un estudio descriptivo transversal en estudiantes del segundo al quinto años de la Facultad de Estomatología de La Habana, Cuba, desde el mes de enero del año 2009 al mes de enero del año 2010. Se emplearon modelos de yeso pertenecientes a 80 estudiantes de 18 a 25 años de edad. Se efectuaron mediciones de los anchos mesiodistales de los dientes y se relacionaron algunas secciones de dientes donde se identificaron los que guardaron relación de proporción divina, según la variable oclusión. Los estudiantes que presentaron maloclusión se estudiaron según la variación del índice de Bolton. En los estudiantes con maloclusión el índice de Bolton que predominó fue a favor de un mayor tamaño de los dientes anteroinferiores, con rangos de proporción divina menores de 1,60(AU)

Patients came more and more frequently to Stomatology services to improve the esthetic feature. Among the more polemic methods for esthetics examination are those based on the use of divine proportion, leading to carrying out of present paper to assess the behavior of divine proportions in the dental measurements of subjects with malocclusion using the Bolton's index. A cross-sectional and descriptive study was conducted in second to fifth years students of the Stomatology Faculty of La Habana from January, 2009 to January, 2010 using the plaster casts in 80 students aged 18 to 25. Measurements of the mesio-distal width of teeth relating some sections of them where were identified those en relation to the divine proportion according the occlusion variable. The students presenting with malocclusion were studied according the variation of Bolton's index. In the students with malocclusion, there was predominance of Bolton's index favoring a great size of anteroinferior teeth with ranks of divine proportion of 1,60(AU)