Department of Stomatology, Beijing Tongren Hospital, Capital Medical University, Beijing, China.
Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan.
J Oral Rehabil. 2020 Dec;47(12):1566-1573. doi: 10.1111/joor.13097. Epub 2020 Oct 5.
Research on resolving implant fracture is still gaining attention as it can be a serious treatment failure outcome. The implant fracture is likely to occur due to increased stress in implant body associated with peri-implant bone resorption.
This study aimed to investigate the relationship between degree of peri-implant bone resorption and stress distribution in implant body by using finite element analysis (FEA).
The magnitude and direction of loads on implants at the mandibular molar region were measured with 3D piezoelectric force transducers in a patient during maximal voluntary clenching, grinding and tapping to obtain input for the FEA as the loading condition. Simplified finite element bone models were generated to simulate the six patterns of peri-implant bone resorption progression which the bone levels from implant platform were set at 0, 1, 2, 3, 4 and 5 mm. Three types of implants with different diameters (3.5, 4.0 and 5.0 mm), corresponding abutments and screws were created. FEA using the in vivo measured load was conducted to investigate how peri-implant bone loss affects stress distribution in the implant body.
Loading condition affected stress distribution in the implant body. As bone resorption increased, von Mises stress in the implant body became larger, which was marked in smaller diameter implants, and this change was amply demonstrated when the bone resorption increased from 0 to 2 mm.
The FEA demonstrated that as peri-implant bone loss increased, the magnitude of stress in the implant increased, especially in small diameter implants.
研究解决种植体骨折仍然受到关注，因为它可能是严重的治疗失败结果。种植体骨折可能是由于与种植体周围骨吸收相关的种植体体部应力增加而发生的。
本研究旨在通过有限元分析（FEA）研究种植体周围骨吸收程度与种植体体部应力分布之间的关系。
通过 3D 压电测力传感器在患者最大自主紧咬、研磨和叩诊期间测量下颌磨牙区种植体上的载荷大小和方向，以获得 FEA 的输入作为加载条件。生成简化的有限元骨模型，以模拟六种种植体周围骨吸收进展模式，即种植体平台处的骨水平分别为 0、1、2、3、4 和 5mm。创建了三种不同直径（3.5、4.0 和 5.0mm）的种植体、相应的基台和螺钉。使用体内测量的载荷进行 FEA 研究，以研究种植体周围骨丧失如何影响种植体体部的应力分布。
加载条件影响种植体体部的应力分布。随着骨吸收的增加，种植体体部的 von Mises 应力变得更大，在较小直径的种植体中更为明显，并且当骨吸收从 0 增加到 2mm 时，这种变化得到了充分的证明。
FEA 表明，随着种植体周围骨丧失的增加，种植体中的应力增加，尤其是在小直径种植体中。
