聚醚醚酮（PEEK）和聚四氟乙烯（PTFE）涂层对牙种植体固位螺钉连接疲劳性能的影响：一项体外研究。
Effect of PEEK and PTFE coatings in fatigue performance of dental implant retaining screw joint: An in vitro study.
作者信息
Chen Xi, Ma Ruiyang, Min Jie, Li Zhi, Yu Ping, Yu Haiyang
机构信息
State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, 610041, Chengdu, Sichuan Province, China; Beijing Stomatological Hospital, Capital Medical University, 100050, Beijing, China.
State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, 610041, Chengdu, Sichuan Province, China.
出版信息
J Mech Behav Biomed Mater. 2020 Mar;103:103530. doi: 10.1016/j.jmbbm.2019.103530. Epub 2019 Nov 14.
OBJECTIVES
Mechanical complications play a key role in failure of dental implants. Retaining screw loosening was one of the most commonly encountered. This study investigated the effect of PEEK and PTFE coatings on dental implant screw thread joint.
METHODS
Retaining screws were coated with PEEK and PTFE in thickness of 30 μm and 60 μm. Friction coefficient and clamping force of screw thread pair were measured, single load-to-fracture (SLF) test and dynamic fatigue life (DFL) test were done to test the stability of implant thread connection. After that, screw fracture mode and erosion morphology of screw surface and implant internal thread were observed.
RESULTS
The results showed that both PEEK and PTFE coatings could reduce friction coefficient, and consequently increase clamping force, especially PTFE coatings. PEEK coatings had no significant effect on fracture load, while 30 μm PTFE coating reduced fracture load. PEEK coatings also elongated fatigue life and improved the anti-loosening property under dynamic load, while 30 μm PTFE coating shortened fatigue life. Most of the screw fracture happened at the first thread of the retaining screws. The fracture-end of PEEK coated screws were loosed and could easily remove, but fracture-end of PTFE screws could not. Internal thread observation showed that both PEEK and PTFE coatings could reduce wear of implant internal thread.
CONCLUSION
PEEK coatings could effectively improve the stability of implant threaded connection, and reduce wear of implant internal thread. PEEK coating may be a suitable way to prevent screw loosening.
目的
机械并发症在牙种植体失败中起关键作用。固位螺钉松动是最常见的情况之一。本研究调查了聚醚醚酮（PEEK）和聚四氟乙烯（PTFE）涂层对牙种植体螺纹连接的影响。
方法
将固位螺钉分别涂覆厚度为30μm和60μm的PEEK和PTFE。测量螺纹副的摩擦系数和夹紧力，进行单载荷至断裂（SLF）试验和动态疲劳寿命（DFL）试验以测试种植体螺纹连接的稳定性。之后，观察螺钉断裂模式以及螺钉表面和种植体内螺纹的侵蚀形态。
结果
结果表明，PEEK和PTFE涂层均可降低摩擦系数，从而增加夹紧力，尤其是PTFE涂层。PEEK涂层对断裂载荷无显著影响，而30μm的PTFE涂层降低了断裂载荷。PEEK涂层还延长了疲劳寿命并改善了动态载荷下的抗松动性能，而30μm的PTFE涂层缩短了疲劳寿命。大多数螺钉断裂发生在固位螺钉的第一螺纹处。PEEK涂层螺钉的断裂端松动且易于移除，但PTFE涂层螺钉的断裂端则不然。内螺纹观察表明，PEEK和PTFE涂层均可减少种植体内螺纹的磨损。
结论
PEEK涂层可有效提高种植体螺纹连接的稳定性，并减少种植体内螺纹的磨损。PEEK涂层可能是防止螺钉松动的合适方法。
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