Stegaroiu R, Kusakari H, Nishiyama S, Miyakawa O
Department of Fixed Prosthodontics, School of Dentistry, Niigata University, Japan.
Int J Oral Maxillofac Implants. 1998 Nov-Dec;13(6):781-90.
A 3-dimensional finite element analysis was conducted to assess stress distribution in bone, implant, and abutment when gold alloy, porcelain, or resin (acrylic or composite) was used for a 3-unit prosthesis. A unit force was applied axially and then buccolingually to the center of the pontic. For gold and porcelain, similar maximum equivalent stress was found in each part of the models. In almost all cases, stress in the model with the resin prostheses was similar to or higher than that in the models with the other 2 prosthesis materials. The highest increase in stress with the resins was found in the implant-abutment unit under axial load. The protective role of resin for the implant-bone interface could not be demonstrated under the conditions of this analysis.
进行了三维有限元分析，以评估当使用金合金、瓷或树脂（丙烯酸树脂或复合树脂）制作三单位修复体时，骨、种植体和基牙中的应力分布情况。轴向施加单位力，然后向桥体中心颊舌向施加单位力。对于金和瓷，在模型的每个部分都发现了相似的最大等效应力。在几乎所有情况下，树脂修复体模型中的应力与其他两种修复体材料模型中的应力相似或更高。在轴向载荷下，树脂修复体中应力增加最高的部位是种植体-基牙单元。在本分析条件下，无法证明树脂对种植体-骨界面的保护作用。
