COMPARISON OF DENTAL ARCH WIDTHS IN CLASS II DIVISION I AND CLASS II DIVISION 2 MALOCCLUSION

The dental arch width is of significant interest to orthodontists. The literature confirms a significant difference among the arch width dimensions among the established type of class II malocclusions. The purpose of this study was thus to compare dental arch widths in Class II/1 with Class II/2 malocclusion subjects. The Intercanine, Interpremolar and Intermolar widths were measured on 100 dental casts (50 class II/1 and 50 class II/2 malocclusion subjects). The data was developed on SPSS 16 for windows. Independent-samples t-test was applied for comparison of the groups. The mandibular Interpremolar width was found out to be significantly narrower whereas Intermolar width was larger in class II/2 sample. No significant differences were documented for maxillary Intercanine and Interpremolar widths, whereas the Intermolar arch width was signifi- cantly lager in class II/2 subjects. Lower Interpremolar width was significantly narrow in class II/ 2 malocclusion and the maxillary and mandibular Intermolar arch width was significantly larger in class II/2 malocclusion.