距離マップを用いた歯の咬み合わせの3次元分法(1部生体の力学的特性)

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In dentistry, the opposing relations between the upper and lower teeth during contact, which is referred to as occlusion, are evaluated chiefly by the location and/or total area of their contact portions. Considering the amount of force applied to the teeth during chewing, however, the proximity between the opposing surfaces as a whole should also be evaluated. In order to evaluate the relations of opposing teeth, including both contact and clearance, the distance transformation was applied, in which any surface point was mapped into the distance between that point and its opposing surface. That distance and its distribution on the surface are referred to as the interocclusal distance and the distance map, respectively. This map provides a closed surface-region where the interocclusal distance is less than or equal to xmm, denoted as R(x). This region can be interpreted as a generalization of contact region R(0) by the interocclusal distance. The proximity can be evaluated by the area of R(x), denoted as s(x)mm^2, which decreases monotonously as the two surfaces approach each other. To verify the validity of s(x) for the occlusal analysis, it was applied to that during lateral excursions. The occlusal surfaces of the upper and lower first molars were digitized by a laser scanner, and the jaw movements were measured in 6 degrees of freedom. The combination of these measurements provides any positional relation between the opposing surfaces during lateral excursions. Proximity s(x) of the upper first molar was computed at various occlusal positions, where the incisal point was less than or equal to 2.0mm from its location in the intercuspal position (ICP). Proximity s(x) relative to that in the ICP, referred to as the relative proximity, was compared on the working and non-working sides. For s(0.3), the difference between the two sides was not significant statistically on the relative proximity in all the lateral positions, suggesting that the portions relatively close to the opposing surface remained even on the non-working side. For s(2.0), however, the relative proximity on the working side was on average larger than that on the non-working side, as was expected. These results revealed that proximity {s(x)|x≧0} considerably reflected the opposing relation of the two surfaces as a whole.
バイオメカニズム学会の論文
1994-08-10

距離マップを用いた歯の咬み合わせの3次元分法(1部生体の力学的特性)

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距離マップを用いた歯の咬み合わせの3次元分法(1部 生体の力学的特性)

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距離マップを用いた歯の咬み合わせの3次元分法(1部生体の力学的特性)