State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
Aerospace Center Hospital, Beijing, China.
Med Biol Eng Comput. 2019 May;57(5):1133-1144. doi: 10.1007/s11517-018-1937-6. Epub 2019 Jan 17.
Micromotion between IAI affects long-term survival rate of dental implants. The use of practical implants for mechanical test is costly. Finite element analysis (FEA) could test the micron level deformation changes, but whether it reflects the in vitro mechanical performances remains unknown. This study aims to investigate the correlation between IAI micromotion of FEA and in vitro performances. The two-step-two-component FEA method was used to test the relative deformation between IAI for three implant designs (M1, M2, and M3) during torque loading and cyclic oblique loading. The micromotion was divided into directions that perpendicular to (x-axis) and parallel to (y-axis) IAI. In vitro experiments on the micromotion relevant performance of IAI microleakage (tested by toluidine blue releasing with a spectrometer) and IAI locked condition (tested by abutment removal force tests after detaching the central screws) were also conducted for the identical implant systems (G1, G2, and G3). One-way ANOVA and Pearson's correlation tests were performed for data analysis. FEA illustrated that the three implant systems performed different micromotion patterns. Significant differences were found in the IAI microleakage and removal force among the groups. Positive correlations were found between FEA and in vitro outcomes. Therefore, the two-step-two-component FEA method is an appropriate method to evaluate the IAI micromotion after loading. Graphical abstract The correspondence of IAI micromotion between FEA analysis and in vitro performances.
种植体微动会影响种植体的长期存活率。使用实际种植体进行机械测试成本高昂。有限元分析（FEA）可以测试微米级别的变形变化，但它是否反映体外机械性能尚不清楚。本研究旨在探讨 FEA 分析中种植体微动与体外性能之间的相关性。采用两步两组件 FEA 方法，测试了三种种植体设计（M1、M2 和 M3）在扭矩加载和循环斜向加载过程中种植体界面相对变形。微动分为垂直于（x 轴）和平行于（y 轴）种植体界面的方向。对相同种植体系统（G1、G2 和 G3）的种植体界面微渗漏（通过光谱仪释放甲苯胺蓝进行测试）和种植体界面锁定状态（通过拆卸中央螺丝后测试基台移除力进行测试）的微动相关性能也进行了体外实验。采用单因素方差分析和 Pearson 相关性检验进行数据分析。FEA 结果表明，三种种植体系统表现出不同的微动模式。组间种植体界面微渗漏和移除力存在显著差异。FEA 分析与体外结果之间存在正相关。因此，两步两组件 FEA 方法是评估加载后种植体界面微动的一种合适方法。
