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@#Intermaxillary tooth size discrepancy (TSD) is the disproportion in patients’ tooth size that is usually referred to the Bolton analysis. This size imbalance may also affect the outcome of orthodontic treatment. Therefore, this retrospective study was conducted to determine the prevalence of intermaxillary tooth size discrepancy (TSD) beyond 2 standard deviation (2 SD) from Bolton’s mean in orthodontic patients and to evaluate the effect of TSD beyond 2 SD of Bolton’s mean on orthodontic treatment outcomes. A total of 226 sets of orthodontic study models that met the selection criteria were selected from 3077 orthodontic cases. Bolton's analysis of the anterior and overall ratios was performed on each of the pre-treatment models. The orthodontic treatment outcomes for the cases which were identified of having TSD beyond 2 SD were evaluated and any interventional techniques to improve the outcome of the treatment were recorded. The results showed that 29.20% of cases had TSD beyond 2 SD of Bolton’s mean. 26.54% of cases had anterior ratio of more than 2 SD. Meanwhile, 7.08% of cases had an overall ratio greater than 2 SD. Of all cases with TSD beyond 2 SP, most of these cases (62.12%) had affected the outcome of orthodontic treatment. In conclusion, there is more than one quarter of orthodontic patients present with TSD beyond 2 SD of Bolton’s mean which may influence the outcome of orthodontic treatment. Intervention techniques should be carefully planned to achieve satisfactory treatment outcomes.
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Objective To measure Bolton index with malocclusions in Shanghai Fengxian district,and ana-lyze the distinction among different malocclusions patients in respect of gengder,age,and different Angle classifica-tion.Methods Measure Bolton index of plaster models of 348 eligible malocclusions patients who were selected ran-domly from Shanghai Fengxian District,and divided them into different groups by gender,age and Angle classification. Then,Bolton overall ratio and Bolton anterior ratio among these groups were analyzed and compared.Results The results showed that there were no significant differences of Bolton analysis in respect of gender or age(all P >0.05). It exsisted obvious differences in anterior ratios among the three Angle malocclusion class(P <0.05).Bolton anterior ratios were (79.88 ±3.15)%,(78.91 ±2.86)% and (80.59 ±1.55)%,mean of Class I and mean of ClassⅢwere bigger than that of Class Ⅱ.Bolton overall ratios of Angle class Ⅰ,classⅡ and class Ⅲ were (79.88 ± 3.15)%,(79.88 ±3.15)% and (79.88 ±3.15)%,and there were no obvious differences in overall ratios among them.Conclusion Bolton index with malocclusions for Shanghai Fengxian District accord with normol Bolton index of our country.Gender and age are not the influencing factors of Bolton index in Fengxian District.Bloton index anomalies are the important fator in malocclusions.We should pay more attention to the Bolton analysis of class Ⅱ malocclusions in clinical practice,and draw up a treatment plan combined with specific classification.
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INTRODUÇÃO: as discrepâncias entre o tamanho mesiodistal dos dentes superiores e inferiores e seus efeitos sobre a oclusão têm sido relatados há muito tempo. O método proposto por Bolton para o diagnóstico de discrepância de tamanho dentário é, inegavelmente, um dos mais difundidos no meio ortodôntico, devido à sua relativa simplicidade. Entretanto, a aplicação desse método requer cálculos matemáticos e o uso de tabelas que, muitas vezes, inviabilizam a sua utilização durante a avaliação clínica. OBJETIVO: avaliar o método proposto por Wolford, que não requer o uso de tabelas, como alternativa ao método tradicional de Bolton. MÉTODOS: a amostra foi composta por 90 pares de modelos dentários iniciais de pacientes adultos, com diferentes más oclusões. A proporção entre os dentes inferiores e superiores foi calculada para cada paciente, resultando na obtenção de dois índices (a razão total e a razão anterior). Os índices foram obtidos por meio do método originalmente proposto por Bolton e por um método alternativo, composto por duas fórmulas (uma simplificada e a variação da mesma), que foram analisadas separadamente. RESULTADOS: comparadas ao método de Bolton, as fórmulas simplificadas mostraram uma tendência de superestimar as discrepâncias dentárias inferiores (total e anterior), embora em pequena proporção. CONCLUSÕES: ambas as fórmulas do método alternativo podem ser utilizadas em substituição ao método tradicional, uma vez que mostraram diferenças médias menores que 0,58mm quando comparadas ao método de Bolton, não apresentando, portanto, significância clínica.
INTRODUCTION: Mesiodistal size discrepancies of upper and lower teeth and their effect on occlusion have been related. Bolton's method for tooth size discrepancies is, undeniably, one of the most commonly-used methods in orthodontics because of its simplicity. However, the application of this method requires mathematical calculations and use of tables, which often prevents its clinical use. PURPOSE: Evaluate an alternative method for Bolton's analysis proposed by Wolford that does not require table information. MATERIAL AND METHODS: The sample was composed of 90 initial dental casts of adult patients, with different malocclusions. The ratio between the sum of widths of maxillary and mandibular teeth was calculated for each patient, resulting in the attainment of two indices: The overall ratio and the anterior ratio. Indices were calculated by Bolton's method and by an alternative method, using two different formulas (one simplified and a variation of the same formula) that were separately analyzed. RESULTS: In comparison with Bolton's method, the Simplified Formulas demonstrated a slight trend towards an overestimation of the inferior dental discrepancies (overall and anterior). CONCLUSION: Both formulas employed for the alternative method may be used to substitute the traditional method, since each demonstrated, on average, differences of less than 0.58 mm when compared with Bolton's method and no clinical significance.
Subject(s)
Humans , Male , Female , Adult , Dental Arch , Diagnosis, Oral , Malocclusion , Weights and Measures , Tooth , OrthodonticsABSTRACT
A discrepância de tamanho dentário ocorre em um número considerável de pacientes que procuram por tratamento ortodôntico, e pode influenciar de maneira negativa os objetivos do tratamento e os seus resultados finais, impedindo a busca da excelência na finalização do caso. Tal deficiência na finalização pode ser detectada e considerada na fase de diagnóstico e planejamento do tratamento, pela análise da discrepância de tamanho dentário. O artigo está ilustrado com o caso clínico de um paciente do sexo masculino, 13,2 anos de idade, que após a realização da análise de Bolton, constatou-se a discrepância de tamanho dentário, com proporção total igual a 95,3 (média de 91,3), demonstrando um déficit na arcada superior devido à anomalia de forma nos incisivos laterais superiores. Sendo assim foi planejado um tratamento multidisciplinar com a Ortodontia para devolver a oclusão e macroestética do sorriso e a Dentística para obter a microestética. Esse planejamento multidisciplinar permitiu o tratamento mais adequado e a excelência na finalização do caso. Portanto a análise de Bolton é uma ferramenta importante na fase de diagnóstico e planejamento do tratamento ortodôntico.
The discrepancy of dental size occurs in a considerable number of patients who search for orthodontic treatment and may negatively influence the treatment objectives and compromise its final results. This size deficiency can be detected and considered in the diagnosis and treatment plan phases through the analysis of tooth size discrepancy. This article illustrates a case report of a male patient, 13.2 years old, who had a tooth size discrepancy identified through the Bolton analysis with a total proportion of 95.3 (average of 91.3), demonstrating a deficit in the superior arch due to a shape anomaly of the superior lateral incisors. Thus, a multidisciplinary treatment course was planned including orthodontic, to reestablish occlusion and macro-esthetic elements of the smile; and restorative dentistry, to improve micro-esthetic quality. This multidisciplinary plan enabled a more adequate course of treatment and higher rate of overall success. Therefore, the Bolton analysis is an important tool in the diagnosis and orthodontic treatment planning phases.
Subject(s)
Humans , Male , Adolescent , Diastema , Tooth/anatomy & histology , OrthodonticsABSTRACT
The purpose of this study was to measure the average tooth size of Korean with normal occlusion. According to the study, the average tooth ratios between the upper and lower teeth which could assure the proper ovebite, overjet and good interdigitation were calculated. The normal occluson sample of this study consisted of 43 Korean male adults and 51 Korean female adults. Among them, 22 Korean male adults and 51 Korean female adults were from KAO(Korean Association of Orthodontists), 21 Korean male adults were from Department of Orthodontics, College of Dentistry, Yonsei University. The results from this study were as follows : 1. The average tooth size of Korean Norm classified by male and female was measured. 2. The average tooth size of Korean male adults with normal occlusion was significantly larger than that of Korean female adults except upper and lower first molars.(p<0.05) 3. The tooth ratio which could predict the proper overbite and overjet in anterior teeth and proper occlusion in posterior teeth was calculated. 1) Sum of inciosrs = 4 : 2.97 2) Neff's anterior coefficient = 1.22 3) Bolton's anterior ratio = 78.29%, overall ratio = 91.14% 4. A positive correlation was observed between the sum of lower anterior incisors and the sum of unilateral canine and premolars in each jaw. Based this correlation, the regression equation was made which could predict the sum of unerupted unilateral canine and premolars in mixed dentition. 1) Sum of unilateral unerupted upper canine and premolars' width = 10.435018 + 0.513346x(sum of lower 4 incisors' width) 2) Sum of unilateral unerupted lower canine and premolars' width = 9.654002 + 0.502565x(sum of lower 4 incisors' width)
Subject(s)
Adult , Female , Humans , Male , Bicuspid , Dentistry , Dentition, Mixed , Incisor , Jaw , Orthodontics , Overbite , ToothABSTRACT
Objective:To investigate whether the changes of anterior arch dimension have an impact on the precision of Bolton analysis. Methods:A mathematic-geometric model was used to evaluate the data. Results:The ideal anterior tooth size ratio may need adjustments, depending on the dimensions in radii of the upper and lower anterior dental arches. The ideal ratio is lower for dental arches with a high anterior curvature. There is a deficiency in the upper arch, a flatter anterior segment may compensate for some of the discrepancy and vice versa. Conclusion:An ideal Bolton value may not guarantee an ideal occlusion. Anterior tooth size ratio is not precise in predicting the anterior inter relationship post-treatment.