Comparative Study of Tooth Size and Arch Dimensions in Class I Crowded, Proclined Malocclusion and Class I Normal Occlusion.

Background: Prevalence of dental crowding has shown a steady rise in the modern population. An effective treatment mode to eliminate malocclusion involves clear understanding of its etiology. Various studies reported so far correlating malocclusion with tooth size- arch dimension discrepancy. This current study would find the correlation between dental malocclusions like crowding and proclination with variables like tooth size and arch dimensions. Aim: purpose of this study to compare the extent and to find whether it is arch dimension or tooth size that contributes to a greater extent to malocclusions like dental crowding and proclination. Methods: Three groups of dental casts were selected. Each group consisted of 30 models (15 male and 15 females). The Following measurement were obtained and compared between groups. Lrgest mesiodistal width of each tooth on each arch, Buccal inter-canine and intermolar widths, Lingual inter-canine and inter-molar widths, Arch perimeters, Arch length, Anterior and overall Bolton ratios. Results: The findings revealed that the mesiodistal tooth dimensions were significantly higher in crowded and proclination group than uncrowded group. In arch dimensions maxillary inter canine and inter molar width were reduced in crowded group. Arch perimeter and arch length were higher in proclination group. Conclusion: The mesiodistal teeth dimensions were significantly higher in crowded and proclination group. Both inter canine width and inter molar width of maxilla were significantly reduced in crowded group than uncrowded and proclination groups. Maxillary and mandibular arch perimeter and arch lengths were significantly increased in proclination group than crowded and uncrowded group