A Comparison of Arch Width in Adults with Normal Class I Occlusion and Adults with Class II Division1 Malocclusion in Ramadi City

Abstract

Aim: The purpose of this study is to compare the arch width between normal class I occlusion and class II div 1 malocclusion in males and females in Ramadi city Methods and Materials: Fifty-six pairs of study models samples were selected from Ramadi secondary school. The mean age of this group is 18.3±0.7 years. The 56pairs of study are divided into two groups. The first group consists of 28 study models of Class I occlusion.The samples were divided evenly between the genders (14 females and 14 males). The second group consists of 28 study models of Class lI division1 malocclusion who were equally divided between the genders (14 males and 14 females) Measurements were made directly on upper and lower dental casts with an electronic digital caliper with sharpened tips. The dental arch width was recorded by measure intercanine width, intermolar width and interalveolar width to compare the two groups, the student’s t-test was used with 95% confidence interval.Results: The present study showed the maxillary intercanine and intermolar width were significant narrower in Class II Division 1 than that in Class I normal occlusion. The maxillary interalveolar widths showed no difference between the two groups. These results suggested that transverse discrepancy in Class II division 1 patients originated from upper posterior teeth and not from the maxillary alveolar base. On the other hand, themandibular intercanine width was significant larger in Class II, Division 1 than that in Class I normal occlusion . The mandibular intermolar and Interalveolar width were significant larger in Class I normal occlusion subjects.Conclusion: The arch widths were smaller in Class II, Division 1 malocclusion compared to Class I normal occlusion except mandibular intercanine width and the arch widths were larger in males than that of females