こう合力による顎口腔系の変形が顎運動解析に及ぼす影響

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  • The effect of the craniomandibular deformation on analysis of the jaw movements.

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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:<BR>1. Maxillary dental arch displacement during clenching in the intercuspal positionaveraged 29±11 μm superiorly, 17±23 μm at the right side and 5±14 μm anteriorly at bilateral first molars. And during clenching on the unilateral first-molar pivot, they averaged 35± 18 μm superiorly, 5±22 μm medially and 21±27 μm anteriorly at the maxillary first molar of the working-side.<BR>2. In the vertical direction, the maxillary tooth arch displacement showed the condyle more inferior than the real position. Those values were 63±47 μm at both condyles (clenchig in the intercuspal position) and 31±65 μm at the working-side condyle (clenching on the pivot).

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