局所機能圧・負担圧に関する基礎的研究 ＩＶ‐２．下顎総義歯の側方こう合位について

Abstract

A study was made on the stress-bearing features of the denture basal seat with changes in the balance and non-masticatory articulation under right-side occlusion. The model for each of right-side occlusion, right rubber-molar occlusion, and right-resin molar occlusion was established. The distributions of stress-bearing in the lower complete denture basal seat were compared. The results were as follows:1. Right-side occlusion (right) Stress borne by alveolar bone was substantially lower than that borne by alveolar mucosa except in the central incisor.Stress rose significantly on the working side of the ridge, border, buccal, lingual, and retromolar pads, and fell significantly on the balancing side.2. Right rubber-molar occlusion (rubber) Stress borne by alveolar bone was substantially lower than that borne by alveolar mucosa except in the central incisor.Stress on the masticatory side of the ridge, border, buccal, lingual, and retromolar pads was significantly higher than in cases of centric and right occlusions.3. Right resin-molar occlusion (resin) Stress borne by alveolar bone was substantially lower than that borne by alveolar mucosa except in the central incisor.Stress on the masticatory side of the ridge, border, buccal, lingual, and retromolar pads was significantly higher than in cases of centric, right and rubber occlusions. Conversely, stress on the non-masticatory side was significantly lower. Negative stress-bearing was found on alveolar mucosa on the non-masticatory side. No stress-bearing was noted on alveolar bone.