Comparison of Occlusal Indices and Dental Arch Dimensions in Monozygotic Twins

Abstract

Introduction & Objective: The study of monozygotic twins is a valuable method for distinguishing the genetic and environmental etiologic factors. The purpose of this study was comparison between occlusal indices and dental arch dimensions in monozygotic twins. Materials & Methods: This descriptive study was preformed on 40 monozygotic twins that their permanent teeth were fully erupted. The variables that were evaluated in this study included: overjet, overbite, molar relationship, canine relationship, anterior circumference of dental arch , total circumference of dental arch , inter canine width , inter molar width. The data were analyzed using SPSS software (the pair t-test and Pearson correlation coefficient). Results: According to pair t-test all the variables had P value more than 0.05.The amount of correlation coefficient of overbite (r=0.907) was greater than the other variables and overjet (r=0.408) was minimum. Conclusion: The occlusal indices and dental arch dimensions in monozygotic twins were compared and mostly influenced by genetics factors. Overbite had the strongest correlation among the occlusal indices in monozygotic twins.

Keywords

• dental arch
• occlusion
• twins