objective: Is to assess skeletal changes in Class II malocclusion correction using miniscrew supported advanced molar distalization appliance (AMDA).
Material and methods: A prospective case series study with twelve participants fulfilling the eligibility criteria were enrolled in the study. All patients included were growing patients with mixed dentition or early permanent before the full eruption of maxillary second molar. The patients were collected from the outpatient clinic of the Orthodontic Department, Ain Shams University. Two mini-screw implant (1.6 x 8 mm) aided AMDA appliance was used for bilateral distalization of maxillary first molars. Lateral cephalometric radiograph was obtained before and after molar distalization; when Class I molar relation was achieved, for all participants. The skeletal changes were assessed using SNA, SNB, ANB, PP/SN, MP/SN, facial height.
Results: There was insignificant change in all measurements with P value > 0.05. In SNA: there was insignificant increase by 0.31 ± 1.52. For SNB, there was an insignificant increase by 0.91 ± 2.79. ANB showed insignificant decrease by -0.61 ± 3.00. Regarding PP/SN, there was insignificant increase by 0.42 ± 3.51. The PFH/AFH Ratio showed insignificant decrease by -0.06 ± 2.86, and LAFH/AFH Ratio increased insignificantly by 0.06 ± 1.82.
Conclusions: AMDA ® is effective for bilateral maxillary molars distalization and Class II correction. AMDA ® distalizer has not skeletal effects, so cannot replace the orthopedic appliance.