顆頭運動の解析法 : 運動学的解析点としての全運動軸点

概要

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Kinematic axis point is known to be one of the posterior reference points of the mandible. We can identify it by its characteristic that it moves reciprocally in sagittal border movement. But no one has investigated how far its estimated location depends on the sagittal movement used. Therefore, we experimentally investigated the reproducibility of the estimated location of the kinematic axis point.Firstly we investigated the variation of the locations estimated by three voluntary sagittal border movement. We evaluated it by the average value of three inter-location-distances, which resulted in 0.77±0.55 [mm] on the average of twenty condyles. As for each condyle, a point with the average location of three measurements appeared to be appropriate for an approximation of the kinematic axis point. Secondly we compared the location estimated by non-border movement with that by the border movement. The results showed that the difference between the two locations was affected by the following two factors : 1) moved distance of the condyle, 2) the difference between rotational angles of the mandible at the same condylar position. When either the moved distance was more than 70% of the maximum value, or the difference of the rotational angle was more than 10 degrees, the difference between the two locations was small.
社団法人日本補綴歯科学会の論文
1988-12-01