Faiza Malik, Iffat Batool.
Evaluation of Tooth Size Discrepancy in Orthodontic patients with Various Skeletal Patterns.
J Sharif Med Dent Coll Jan ;5(2):85-9.

Objective: To determine the frequency of various skeletal patterns in orthodontic patients with malocclusion and evaluate mean tooth size discrepancy ratios in various skeletal patterns. Methodology: It was a cross-sectional study with consecutive sampling conducted at 28 Military Dental Centre, Lahore. After approval from the ethical committee and written informed consent from patients, the ANB angle of 150 orthodontic patients was derived from corresponding lateral cephalograms to determine the skeletal pattern (Class I, II, III). Their impressions were taken with alginate and poured with hard plaster to form pre-treatment study casts. The mesiodistal widths of all maxillary and mandibular teeth from right first molar to left first molar were measured on the casts using a digital caliper, to calculate the anterior and overall ratios via Bolton analysis. Results: The frequency of skeletal patterns was such that there were 34.7% patients with Class I skeletal pattern, 51.3% of patients with Class II skeletal pattern and 14% of patients with Class III skeletal pattern. No significant difference in the overall and anterior Bolton ratios in different skeletal patterns (p>0.05) was observed upon the application of ANOVA and Tukey's test. However, the anterior ratios for all skeletal patterns showed higher values than the norm, owing to the diversity of skeletal patterns selected. The frequency of individuals with significant tooth size discrepancy i.e. outside 2SD of Bolton's norms was 12.6% for overall ratio and 36.0% for anterior ratio. No sexual dimorphism was observed. Conclusion: Class II skeletal pattern showed the highest frequency in this study. No significant difference was found in the tooth size discrepancy ratios in different skeletal patterns and both genders. However, a common trend was noted towards excess tooth material in the mandibular anterior region of all skeletal patterns. Keywords: Tooth size discrepancy. Bolton's norms. Bolton analysis. Overall ratio. Anterior ratio.

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