Compensatory Treatment In Skeletal Class III Malocclusion

Compare an all four second premolar extraction approach with a mandibular third molar extraction and temporary anchorage devices (TADs)-based approach for compensatory orthodontic treatment in mild to moderate skeletal class III malocclusion. 31 subjects with skeletal class III malocclusion were included in this retrospective, observational study. Lateral cephalograms taken before and after treatment were used to perform measurements for 7 dental indicators, 9 skeletal indicators, and 5 soft tissue indicators. Statistical analyses were performed . Dental cephalometric measurements showed that IMPA (-7.73±4.72°) and L1-NB (-8.36 ±4.57°)all significantly reduced (P<0.05) in the premolar extraction group, while the changes were non-significant in the mandibular third molar extraction group, Skeletal cephalometric measurements showed that ANB increased (premolar extraction group: 1.01±0.86°, mandibular third molar extraction group: 1.22±0.93°) significantly in both groups, (P<0.05); with a significantly larger decrease in SNB in the premolar extraction group (P<0.05). Soft tissue measurement items showed Lip Difference increased (premolar extraction group: 2.30±0.58, mandibular third molar extraction group: 2.01±0.52mm) significantly in both groups (P<0.05), with between-group differences non-significant. For mild and moderate skeletal class III malocclusion patients, both premolar extraction and mandibular third molar extraction with TADs showed good clinical outcomes. Soft tissue changes mainly included improvements in lower lip protrusion with the two groups.