Mesiodistal Size Asymmetry of the Left and Right Quadrant

Background It has been proved that, there's craniofacial asymmetry but much of this skeletal asymmetries are clinically ignorable. This asymmetry may exist in teeth size arranged in right and left sides of human mouth too. Orthodontists should pay attention to bilateral tooth asymmetry in treatment planning stage. Objectives This study was conducted to demonstrate whether the difference between size of left and right side teeth is actual. Materials and Methods A total of ۲۰۰ plaster dental molds were used which were collected from a private practice in Tehran. A caliper with accuracy of ۰.۰۱ mm was used for measuring teeth and most teeth were measured twice and the average value was considered as the teeth size. In all cases, the Vernier calipers jaws were moved along the teeth longitudinal axis and the biggest width was measured in the contact point area. Results In average ۸۳.۱۶% of left and right teeth in upper jaw and ۸۳.۶۶% of left and right teeth in the lower jaw were not symmetrical and teeth in the upper and lower jaws were completely similar ۱۶.۸۴% and ۱۶.۳۴%, respectively. Conclusions The result of the study showed that nearly ۸۳% of teeth in maxilla and mandible are asymmetric in mesiodistal width. Mandibular second molar and canine showed the highest and lowest bilateral asymmetry respectively.

Keywords:

Asymmetry , Tooth Size , Mesiodistal Width