Abstract
AIM: To verify the presence of Bolton anterior and total discrepancy in Brazilian individuals with natural normal occlusion and Angle's Class I and Class II, division 1 malocclusions. METHODS: The sample was divided in three groups (n=35 each): natural normal occlusion; Class I malocclusion; Class II, division 1 malocclusion. Of the 105 Caucasian Brazilian individuals, 24 were boys and 81 were girls aged from 13 to 17 years and 4 months. The mesiodistal width of the maxillary and mandibular teeth, from the left first molar to the right first molar, was measured on each pre-treatment dental plaster cast using a digital caliper accurate to 0.01 mm resolution. Values were tabulated and the Bolton ratio was applied. The Kolmogorov-Smirnov test was used to verify if data were normally distributed (p>0.2). For comparison between the values obtained and those from the Bolton standard, Student's t test was used and one-way ANOVA was used for comparisons among the 3 groups, with a significance level of 5% (p<0.05). RESULTS: For groups 1, 2 and 3, respectively, the total ratio found was 90.36% (SD 1.70), 91.17% (SD±2.58) and 90.76% (SD±2.45); and the anterior ratio was 77.73% (SD 2.39), 78.01% (SD 2.66) and 77.30% (SD 2.65). CONCLUSIONS: There was no significant difference among the groups regarding the values indicated in the Bolton ratio.
Highlights
Received for publication: October 03, 2013 Accepted: December 17, 2013A detailed planning phase is critical to the success of orthodontic treatment, by which the professional may identify and prevent occlusal disorders that impede treatment completion[1,2]
Given the importance of these topics, this study aimed to evaluate the presence of the Bolton anterior and total discrepancy in individuals with natural normal occlusion, Class I and Class II, division 1 malocclusions
Since no occurrence of gender dimorphism was found, the sample was grouped so that it could be possible to compare a potential relationship between natural normal occlusion and the different types of malocclusion (Class I and Class II, division 1)
Summary
A detailed planning phase is critical to the success of orthodontic treatment, by which the professional may identify and prevent occlusal disorders that impede treatment completion[1,2]. In this stage tooth discrepancies have greater influence. In the beginning of the last century, Black became interested in the study of dental morphology and size[6]. The Bolton analysis[2] came up with the proposal to locate and determine tooth size discrepancies – intra and intermaxillary – avoiding the need to perform set up for such purpose. The Bolton method assists in the decision to perform interdental stripping, dental extractions, or even increase of dental crown with restorative material
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