2 上顎前突症例の治療効果について : とくに上顎口蓋部の三次元的考察(第518回大阪歯科学会例会)

概要

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There are many case reports on the clinical effect of maxillary prognathy. However, few reports compare relapse cases with those that result in stable occlusion. We compared a maxillary prognathy relapse case (case A) and one with stable occlusion (case B) three and a half years after completion of orthodontic treatment. Four reference lines (L1, L2, L3 and L4) and two reference points (A0, PM-A0) were established on the plaster models of the two cases. Case A with relapse showed no remarkable changes in the Mid-Curve except in the anterior region. However, the primary cause of the relapse was a large change in the width and depth of the PM Curve. There were no remarkable changes in the MM Curve. Case B showed no remarkable changes in the Mid-Curve of the anterior and premolar regions. However, there were considerable changes in the deep palate of the molar region at the Mid-Curve. This stable occlusion case showed remarkable changes in the depth at the MM Curve, but no significant changes at the PM Curve. Our findings based on three-dimensional models were highly accurate and reliable in distinguishing the differences between the relapse case and the one with stable occlusion.
2009-06-25