咬合力による顎口腔系の変形が顎運動解析に及ぼす影響

概要

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At the present time, there are several Jaw movement analyzers that can analyze the condylar movements in six degrees-of-freedom. All of them are mounted between maxillary and mandibular face-bows. And all investigators study jaw movements on assumption that the human body is rigid. But the occlusal force causes the displacement of teeth and deformation of bones. In this study, we measured the displacement of maxillary dental arch during clenching with two occlusal conditions in three subjects, and evaluated its effects on analysis of Jaw movements quantitatively. We recorded the clenching for three times with each condition in each subject. The results are as follow : 1 . Maxillary dental arch displacettaent during clenchiuag in the intercuspal position averaged 29±11μm superiorly, 17±23μm at the right side and 5±14μm anteriorly at bilateral first molars. And during clenching on the unilateral first-molar pivot, they averaged 35±18μm superiorly, 5±22μm medially and 21±27μm anteriorly at the maxillary first molar of the working-side. 2. In the vertical direction, the maxillary tooth arch disrlacement showed the condyle more inferior than the real position. Those values were 63±47μm at both condyles (clenchig in the intercuspal position) and 31±65μm at the working-side condyle (clenching on the pivot).
日本補綴歯科学会の論文
1990-12-01