Overall and anterior Bolton ratio in Class I, II, and III orthodontic patients

Wędrychowska-Szulc, Barbara; Janiszewska‐Olszowska, Joanna; Stępień, Piotr

doi:10.1093/ejo/cjp114

Cited by 40 publications

(44 citation statements)

References 28 publications

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“…However, other studies have observed significant differences in the presence of tooth size discrepancies among malocclusion groups. 10,11,12,13 Wedrychowska-Szulc et al 14 compared tooth size ratios in 600 study casts of patients with different malocclusion groups (Class I, Class II division 1, Class II division 2, and Class III) and found statistically significant differences in the overall ratio among all groups and in the mean ratio in the anterior region between Class I and Class III groups. Araujo and Souki 10 assessed the association between tooth size discrepancy in the anterior region and Class I, II, and III Angle malocclusions in 300 Brazilian patients.…”

Section: Introductionmentioning

confidence: 99%

Association between Bolton discrepancy and Angle malocclusions

Cançado¹,

Júnior²,

Valarelli³

et al. 2015

Braz. oral res.

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This study aimed to assess and compare the overall and anterior ratios of tooth size discrepancies in all Angle malocclusion groups. The following null hypothesis (H0) was tested: no difference between tooth size discrepancies (overall and anterior) would be observed among Angle malocclusion groups. The sample comprised of 711 pre-orthodontic treatment study casts of Brazilian patients with a mean age of 17.42 years selected from private practices in Brazil. The casts were divided into 3 groups according to the type of malocclusion: Class I (n = 321), Class II (n = 324), and Class III patients (n = 66). The measurement of the greatest mesiodistal width of the teeth was performed using a centesimal precision digital caliper directly on the study casts, from the distal surface of the left first molar to the distal surface of the right first molar. The overall and anterior ratios between the maxillary and mandibular teeth were evaluated using Bolton's method. The following statistical tests were applied: chi-square, independent t-test, and one-way ANOVA. Results showed that all Angle malocclusions groups exhibited a ratio compatible with those recommended by Bolton. With respect to the overall and anterior ratios among the malocclusion groups, no statistically significant differences were found. The null hypothesis was accepted because the results showed no differences in the overall and anterior ratios of tooth size discrepancies among different Angle malocclusion groups.

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Section: Introductionmentioning

confidence: 99%

Association between Bolton discrepancy and Angle malocclusions

Cançado¹,

Júnior²,

Valarelli³

et al. 2015

Braz. oral res.

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“…There were no significant systematic errors, and the random errors of the mesiodistal diameters of each tooth were within acceptable limits 14,15 , ranging from 0.10 (canines) to 0.31 mm (molars).…”

Section: Resultsmentioning

confidence: 78%

Applicability of bolton’s tooth size ratios among mediterranean, japanese and japanese-brazilian populations

et al. 2017

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Objective: The aim of this study was to determine if Bolton's tooth size ratios can be applied to Mediterranean, Japanese and Japanese-Brazilian populations. Materials and methods: The sample comprised 90 pairs of dental casts of untreated individuals with normal occlusion, divided into 3 groups according to ethnical characteristics: White (30 Mediterranean descendant subjects, with a mean age of 13.64 years), Japanese (30 subjects with Japanese ancestry, with a mean age of 15.63 years) and Japanese-Brazilian (30 Japanese-Brazilian subjects, with a mean age of 13.96 years). A digital caliper was used to measure the maxillary and mandibular mesiodistal widths from first molar to first molar on each dental cast. The anterior and overall tooth size ratios were calculated. T test was applied for comparisons between Bolton standards and the ethnical groups for anterior and overall ratios. Results: Only the Japanese-Brazilian group showed significantly greater ratios than Bolton standards. Conclusion: It was concluded that Bolton's ratios are not applicable to the Japanese-Brazilian population. Therefore, it is suggested that Bolton's ratios may not be suitable for different populations.

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“…Some researchers have concluded that interarch relationships are correlated with sex, ethnicity, and type of malocclusion, [15][16][17]29 whereas others refute such findings. 20 Moreover, the Bolton indexes are essentially means with wide ranges of values (anterior, 74.5-80.4; overall, 87.5-94.8), indicating great interindividual variability in what is considered normal occlusion.…”

Section: Discussionmentioning

confidence: 99%