Evaluation of Dental Crowding and Spacing in Relation to Tooth Size and Arch Dimensions in a Sample of Sudanese Adults.

AIMS AND OBJECTIVES: This study aimed to compare tooth size and arch dimensions between normal, crowded, and spaced groups in a Sudanese sample. MATERIAL AND METHODS: A sample of 312 university students, were selected and divided into normal, crowded, and spaced groups. Each group included 104 students with equal males to females ratios. Age was ranged from 16 to 26 years. Mesiodistal (MD) tooth width of all teeth (except molars), arch perimeters, and dimension at the level of intercanine, interpremolar, and intermolar were measured for each group. ANOVA and student t-test were performed for the comparison between groups. RESULTS: The MD dimensions of all teeth are greater in crowded arches as compared to the teeth in normal dental arches, except for the width of the maxillary, left second premolar in females, and mandibular left second premolar in male. Spaced arches were presented with significantly smaller MD width in all teeth when compared to normal arches, except for the width of maxillary right second premolar, maxillary left first premolar, mandibular right and left second premolars in female, and maxillary right second premolar in male. Crowded arches exhibit the largest total tooth material followed by normal and spaced dentition. Spaced arches show the widest arch dimension and perimeters followed by normal and crowded dentitions. CONCLUSIONS: Both tooth size and arch dimensions contribute to dental crowding and spacing. CLINICAL RELEVANCE: Since the size of the teeth and dental arches affect the space availability of the dentition. These factors should be considered in the initial stages of orthodontic treatment planning to avoid compromised treatment outcomes.

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)