骨内インプラントの形状および支持部位との接合状態が応力分布に及ぼす影響

Abstract

For the purpose of examining the influence of an implant body on stress distribution in alveolar bone, we carried out a two-dimensional photoelastic experiment using different shapes of the wing portion of the implant body and different conditions of its union with the supporting alveolar bone (e. g., presence of connective tissue between the implant body and alveolar bone, etc.), as well as different implant directions (i. e., vertical vs. 10°-nclined implantation).The results obtained were as follows:1. The use of implants with a curved lower margin and a silicone-coated surface led to a shift was not observed in the absence of silicone at the interface.2. Shaping of the lower margin of the implant body curve resulted in a more even distribution of the stress, and this effect depended upon the presence of the silicone at the interface, direction of the implantation, and the degree of curvature of the lower margin.3. Vertically placed implants showed an even stress distribution on both sides of the wing portion, as compared with the uneven stress found for the inclined ones. Furthermore, the presence of silicone at the interface caused the stress to be concentrated mainly at the lower margin of the wing portion, while implants without the silicone showed stress concentrated at not only the lower margin, but also at the neck portion.