中心螺丝锥度角度对牙种植体松动性能和疲劳特性的影响。

Effect of central screw taper angles on the loosening performance and fatigue characteristics of dental implants.

机构信息

Key Laboratory of Implant Device and Interface Science of Liaoning Province, School of Mechanical Engineering and Automation, Northeastern University, Shenyang, 110819, China.

Key Laboratory of Implant Device and Interface Science of Liaoning Province, School of Mechanical Engineering and Automation, Northeastern University, Shenyang, 110819, China; State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China.

出版信息

J Mech Behav Biomed Mater. 2022 May;129:105136. doi: 10.1016/j.jmbbm.2022.105136. Epub 2022 Feb 24.

DOI:10.1016/j.jmbbm.2022.105136

PMID:35231728

Abstract

Biomechanical performance plays an important role in the long-term service of dental implants. Loosening and fatigue damage of the central screw are the most common problems. This research investigated the effect of the central screw taper angle on the loosening performance and fatigue characteristics of dental implants. Central screws with four taper angles, 30°, 60°, 90° and 180°, were processed and tested. The loosening performance of the screws under initial and postload conditions was compared. Then, the fatigue characteristics of dental implants was measured. Finally, the wear and fracture modes of the screws were observed. The damage locations were verified by finite element analysis (FEA). The results showed that the central screws with 30° taper had substantially better anti-loosening performance and less fretting wear. The central screws with 180° taper had a higher preload, resulting in a longer fatigue life. Furthermore, the fatigue fracture of the central screw occurred at the level of the first thread position, consistent with the FEA results. In the future clinical applications, central screws with a 30° taper angle may improve anti-loosening performance and prolong fatigue life by increasing the tightening torque.

摘要

生物力学性能在牙种植体的长期使用中起着重要作用。中央螺丝的松动和疲劳损伤是最常见的问题。本研究探讨了中央螺丝锥度角对牙种植体松动性能和疲劳特性的影响。加工和测试了具有 30°、60°、90°和 180°四个锥度角的中央螺丝。比较了初始和后加载条件下螺丝的松动性能。然后，测量了牙种植体的疲劳特性。最后，观察了螺丝的磨损和断裂模式。通过有限元分析（FEA）验证了损伤位置。结果表明，具有 30°锥度的中央螺丝具有更好的防松动性能和更少的微动磨损。具有 180°锥度的中央螺丝具有更高的预紧力，从而具有更长的疲劳寿命。此外，中央螺丝的疲劳断裂发生在第一螺纹位置，与 FEA 结果一致。在未来的临床应用中，通过增加拧紧扭矩，具有 30°锥度角的中央螺丝可能会提高防松动性能并延长疲劳寿命。