A Study on 3-Dimensional Condylar Movements in Lateral Mandibular Movements. Part 4 The Timing of the Mandibular Side Shift.

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  • 側方運動におけるか頭部三次元動態に関する研究　第４報下顎のサイドシフトのタイミング
  • Part 4 The Timing of the Mandibular Side Shift
  • 第4報下顎のサイドシフトのタイミング

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The lateral movements of 40 young adults were measured and the timing of the mandibular side shift was analyzed. The following results were obtained:<BR>1. The KA angle-side shift curve was developed to analyze the timing of the mandibular side shift. The KA angle was defined as the rotation angle of the intercondylar axis for the working condyle during lateral mandibular movement.<BR>2. The curves were classified as 5 patterns according to the timing of the side shift:<BR>type I; a side shift occurred proportional to the KA angle (movement of the mandible).<BR>type II; a side shift occurred in the early stage of the movement.<BR>type III; the curve is sigmoidal, which means that a side shift occurred in the early and late stage of the movement.<BR>type N; a side shift occurred in the last part of the movement.<BR>type V; a side shift occurred in the middle of the movement.<BR>And type 0, which has no significant side shift, was added to the timing.<BR>3. Type 0-III were popular patterns in all 80 condyles, but type N and V were rare.<BR>4. The significant side shift occurred before the middle of the lateral movements for most condyles.

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