Lecturer, Faculty of Dentistry, Department of Prosthodontics, Near East University, Mersin, Turkey.
Implant Dent. 2018 Jun;27(3):303-310. doi: 10.1097/ID.0000000000000750.
To evaluate the effects of prosthetic material on the degree of stress to the cortical bone, trabecular bone, framework, and implants using finite element analysis (FEA).
A mandibular implant-supported fixed prosthesis was designed. Different prosthetic materials [cobalt-chromium-supported ceramic, zirconia-supported ceramic, and zirconia-reinforced polymethyl methacrylate (ZRPMMA)-supported resin] were used. FEA was used to evaluate stress under different loading conditions. Maximum principal (σmax), minimum principal (σmin), and von Mises (σvM) stress values were obtained.
Similar σmax, σmin, and σvM values were observed in the cortical and trabecular bones and in implants under both loading conditions, with the exception of the ZRPMMA model, which showed the highest σmax, σmin, and σvM values in oblique loading. The ZRPMMA model had the lowest σvM value in the framework under both loading conditions.
ZRPMMA had the lowest stress values in the framework, with increased stress values in the implants and bone tissue. Framework and veneering materials may influence stress values under different loading conditions.
通过有限元分析（FEA）评估修复材料对皮质骨、松质骨、支架和种植体的应力程度的影响。
设计了下颌种植体支持的固定修复体。使用了不同的修复材料[钴铬陶瓷支持体、氧化锆陶瓷支持体和氧化锆增强聚甲基丙烯酸甲酯（ZRPMMA）支持体树脂]。FEA 用于评估不同加载条件下的应力。获得了最大主应力（σmax）、最小主应力（σmin）和冯·米塞斯（σvM）应力值。
在两种加载条件下，除了 ZRPMMA 模型外，皮质骨和松质骨以及种植体中的 σmax、σmin 和 σvM 值相似，而 ZRPMMA 模型在斜向加载下显示出最高的 σmax、σmin 和 σvM 值。在两种加载条件下，ZRPMMA 模型在支架中的 σvM 值最低。
ZRPMMA 在支架中的应力值最低，而在种植体和骨组织中的应力值增加。支架和饰面材料可能会影响不同加载条件下的应力值。
