Dento-skeletal changes associated with treatment of deep overbite in class II malocclusion

Abstract

The present study aimed to evaluate the treatment changes in class II patients with deep overbite. A total of 22 females (15-18 years) were treated with fixed orthodontic appliances divided into 2 groups; the first group comprised of 12 cases with class II division 1and the second group ten cases with class II division 2. All cases possessed over bite more than 4 mm, class II more than 4 degrees and had pre and post treatment lateral cephalometric x-ray films. Eleven angular and ten linear cephalometric measurements were recorded and analyzed before and after treatment. The differences in mean values of variables within each studied group were statistically analyzed using Wilcox on singed rank test. On the other hand the mean differences of overbite before and after intervention were compared between the two studied groups using Mann-Whitney test.Results: Bite depth improved an average of 5.6 mm in class II division1, and 2.6 mm in class II division2 with significant differences within and between the studied groups. All measurements showed changes that were statistically significant except SNB0 in both groups, ANB0, OP/MP0, U1-PP, ANS-Me in group 1, and L1-MP in group 2. Conclusion: Bite depth improved due to the changes in the axial inclination of incisor teeth that were decreased in class II division1, while increased in class II division 2, intrusion of lower incisor in class II division1, and intrusion of maxillary incisor in class II division 2 in addition to extrusion of upper and lower molars in both groups.