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Aim: The aim was to study and compare lower incisor dentoalveolar compensation and mandibular symphysis morphology of patients with Class II and Class III malocclusion. Materials and Methods: Lower incisor inclination (incisor mandibular plane angle [IMPA]), as well as buccal (LA) and lingual (LP) cortex depth, and mandibular symphysis height (LH) were measured in 60 lateral cephalometric X-rays of adult patients without prior orthodontic treatment. The subjects were divided into three groups based on antero-posterior skeletal malocclusions Class I (control group), Class II and Class III groups. Results: IMPA and symphysis dimensions showed significant differences between the sagittal malocclusion groups. In Class III subjects, the lower incisor apex was closer to the buccal cortex, therefore, value of LA was decreased and LH was increased. In Class II subjects, the lower incisor apex was near to the lingual cortex, there value of LP was reduced and LH increased. Conclusion: Narrow alveolus was observed in Class II and III subjects compared to the Class I subjects. Natural compensation elongates the symphysis and influences the lower incisor position. Thus limiting the pre-surgical decompensation and increasing the risk of damage to periodontal tissues.

Lower incisor dentoalveolar compensation and symphysis dimensions in class II and class III patients