مقایسه شاخصهای اکلوژن و ابعاد قوس دندانی بین دوقلوهای همسان

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.