Objective: To assess incisor position and its correlation to alveolar bone thickness on lateral cephalogram in pretreatment different Angle’s Classes of malocclusions.Methods: Comparison of pretreatment cephalograms of Class l malocclusion was done among different types of malocclusions according to Angles classification. Each group comprises of 60 cephalograms. The study consists of males and females both to determine comparison between genders. Positions of upper and lower central incisors and their association to alveolar bone thickness were analyzed in 240 cephalograms.Results: Notable differences were observed between the groups in relation to maxillary and mandibular alveolar bone thickness. Mx-Alv (p=<0.001) and Mn-Alv (p=0.018) with greater value in mandible, palatal and labial bone thickness in maxilla U1-pal (p=0.001) and U1-lab (p=0.032) with greater on palatal side, maxillary and mandibular incisor inclination U1-incl. (p=<0.001) and L1-incl. (p=<0.001) with greater in upper incisor. On comparison of all classes of malocclusion with class 1 malocclusion some of the results were statistically significant. Gender based results were non-significant, but age showed significant results.Conclusion: Significant differences in alveolar bone thickness and incisor inclination were observed among different Angle’s classes of malocclusion, with age showing a significant association. Greater palatal alveolar bone support in Class II Division 1 cases suggests that increased maxillary incisor retraction may be achieved safely during orthodontic treatment.
Rizwan et al. (Tue,) studied this question.