Yatabe M, Zwijnenburg A, Megens C C, Naeije M
First Department of Prosthodontics, Faculty of Dentistry, Tokyo Medical and Dental University, Japan.
J Dent Res. 1995 Oct;74(10):1644-8. doi: 10.1177/00220345950740100401.
The kinematic center of the temporomandibular condyle is that condylar point which follows as much as possible the same movement path during different types of mandibular movements. In this study, the location of the kinematic center with respect to the palpated lateral pole of the condyle was investigated. Also, the lengths of the condylar movement path reconstructed by means of the kinematic center and the palpated condyle were compared. Mandibular movements were recorded with 6 degrees of freedom in 20 healthy subjects. A software procedure calculated the location of the kinematic center as that mandibular point for which the protrusive and opening movement path showed a minimal difference. For each subject, its average location was calculated on the basis of 16 pairs of protrusive and opening movements. The kinematic center was located posteriorly and superiorly with respect to the palpated condylar point (p < 0.0001). The standard deviation in the anterior-posterior coordinate of the average kinematic center was smaller than that in the superior-inferior coordinate (p < 0.0001). During opening, the path length of the kinematic center is longer than that of the palpated lateral pole of the condyle (p < 0.0001). In contrast to left-right differences found in the path lengths of the lateral pole of the condyle, no left-right differences were found for the kinematic center.
颞下颌关节髁突的运动中心是在不同类型的下颌运动中尽可能遵循相同运动轨迹的髁突点。在本研究中，研究了运动中心相对于通过触诊确定的髁突外侧极的位置。此外，还比较了通过运动中心和触诊髁突重建的髁突运动轨迹的长度。对20名健康受试者的下颌运动进行了六自由度记录。一种软件程序将运动中心的位置计算为下颌点，其前伸和开口运动轨迹显示出最小差异。对于每个受试者，基于16对前伸和开口运动计算其平均位置。运动中心相对于触诊髁突点位于后方和上方（p<0.0001）。平均运动中心前后坐标的标准差小于上下坐标的标准差（p<0.0001）。在开口过程中，运动中心的轨迹长度比触诊的髁突外侧极的轨迹长度长（p<0.0001）。与髁突外侧极轨迹长度的左右差异不同，运动中心未发现左右差异。
