Department of Prosthodontics, School of Dentistry, Kaohsiung Medical University, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
J Endod. 2010 Oct;36(10):1688-92. doi: 10.1016/j.joen.2010.07.002. Epub 2010 Aug 21.
This study was designed to investigate the biomechanical interactions in endodontically treated tooth implant-supported prosthesis with variations in implant system and load type by using the nonlinear finite element (FE) approach.
The computed tomography (CT), micro-CT image process, and computer-aided design systems were integrated to construct the FE models containing 1-, 2-, and 3-piece implants splinted to the second premolar. Realistic interface conditions within the implant system were simulated by using frictional contact elements, and mechanical responses in terms of von Mises stress were computed for all models.
The simulated results indicated that splinting an endodontically treated tooth to a neighbor implant decreased stress values in dentin and post but increased stress of implant and bone. The oblique occlusal forces increased the stress values relative to those of axial analogs. A splinted system with a 2-piece implant increased stress on the bone and decreased stress on the prosthesis compared with that of the 1-piece implant.
Splints with 1-piece implant prosthesis, without eccentric occlusal contacts, have better mechanical responses than those of 2- or 3-piece implants when connected to an endodontically treated tooth restored with post core and crown.
本研究旨在通过非线性有限元（FE）方法，研究不同种植体系统和载荷类型对根管治疗后牙种植体-支持修复体的生物力学相互作用。
通过将 CT、微 CT 图像处理和计算机辅助设计系统集成，构建了包含 1、2 和 3 部分种植体的 FE 模型，这些种植体连接到第二前磨牙上。通过使用摩擦接触元素模拟种植体系统内的真实界面条件，并计算所有模型的 von Mises 应力机械响应。
模拟结果表明，将根管治疗后的牙齿与邻接种植体固定在一起，会降低牙本质和桩内的应力值，但会增加种植体和骨的应力。斜向咬合力与轴向类似物相比，会增加应力值。与 1 部分种植体相比，2 部分种植体的固定系统会增加骨上的应力，减少修复体上的应力。
对于与带有桩核和冠修复的根管治疗后牙齿相连的 1 部分种植体修复体，带有夹板的系统在没有偏心咬合接触的情况下，其机械响应优于 2 部分或 3 部分种植体。
