Micromotion of implant-abutment interfaces (IAI) after loading: correlation of finite element analysis with in vitro performances
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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.
KeywordsDental implants Finite element analysis Microleakage Micromotion Locked condition
The authors gratefully thank Shandong Weigao Group Medical Polymer Co., Ltd. (Weihai, Shandong, China) for providing WEGO implants.
This study was supported by the National Natural Science Foundation of China (No. 81771113), the National Key Research and Development Project (2016YFC1102704), the Provincial Key Technology Research and Development Program of the Ministry of Science and Technology of Sichuan Province (No. 2014SZ0037), and the Sichuan Province Science and Technology Innovation Team Program (2011JTD0006).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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