Changes in the anterior and posterior occlusal plane in nongrowing females with hyperdivergent skeletal Class II malocclusion treated with mini-implant anchorage

Abstract

Abstract Objectives: To analyse anterior and posterior occlusal plane (AOP and POP, respectively) canting changes in camouflage treatment of females growth completed with hyperdivergent skeletal Class II malocclusion using mini-implant (MI) anchorage. Materials and methods: This retrospective study included 50 nongrowing females with hyperdivergent skeletal Class II malocclusion treated with extraction of the maxillary first premolars and mandibular second premolars. Participants were divided into the MI (n = 25) and control (without MIs, n = 25) groups. Cephalometric analyses of these patients were performed before (T1) and after (T2) treatment. Measurements were taken at each treatment stage and analysed within and between groups. Results:Significant correlations were observed between AOP and POP canting and mandibular position (P < 0.05), and AOP canting had a greater impact on mandibular position. Moreover, compared with those of the control group, the AOP and POP canting, the vertical height of the maxillary first molar and incisor, and mandibular plane angle were significantly decreased. Conclusions: During the camouflaging treatment of nongrowing females with hyperdivergent skeletal Class II malocclusion using MI anchorage, reduction in POP and AOP canting and intrusion of the maxillary incisor and first molar made a difference in the mandibular counterclockwise rotation, which, in turn, improved the facial profile. Clinical relevance: These findings can form the basis for evaluating the reduction in POP and AOP cantings and the intrusion of the maxillary incisor and first molar in the camouflaging treatment of nongrowing females with hyperdivergent skeletal Class II malocclusion using MI anchorage.