Graduate student, Department of Prosthodontics, School of Dentistry, Chosun University, Gwangju, Korea.
J Adv Prosthodont. 2009 Jul;1(2):102-6. doi: 10.4047/jap.2009.1.2.102. Epub 2009 Jul 31.
Screw loosening has been a common complication and still reported frequently.
The purpose of this study was to evaluate abrasion of the implant fixture and TiN coated abutment screw after repeated delivery and removal with universal measuring microscope.
Implant systems used for this study were Osstem and 3i. Seven pairs of implant fixtures, abutments and abutment screws for each system were selected and all the fixtures were perpendicularly mounted in liquid unsaturated polyesther with dental surveyor. After 20 times of repeated closing and opening test, the evaluation for the change of inner surface of implant and TiN-coated abutment screw, and weight loss were measured. Mann-Whitney test with SPSS statistical software for Window was applied to analyze the measurement of weight loss.
TiN-coated abutment screws of Osstem and 3i showed lesser loss of weight than non-coated those of Osstem and 3i (P < .05, Mann-Whitney test).
Conclusively, TiN coating of abutment screw showed better resistance to abrasion than titanium abutment screw. It was concluded that TiN coating of abutment screw would reduce the loss of preload with good abrasion resistance and low coefficient of friction, and help to maintain screw joint stability.
螺丝松动是一种常见的并发症，仍有频繁报道。
本研究旨在使用万能测量显微镜评估种植体修复螺丝在反复装卸过程中对种植体螺丝的磨损。
本研究使用的种植体系统为奥齿泰和 3i。每个系统各选择 7 对种植体螺丝、基台和基台螺丝，并将所有基台垂直安装在不饱和聚酯液体中，用牙科测量器进行测量。经过 20 次反复开闭测试后，对种植体和 TiN 涂层基台螺丝内表面的变化以及重量损失进行评估。采用 SPSS 统计软件的曼-惠特尼检验对重量损失进行分析。
奥齿泰和 3i 的 TiN 涂层基台螺丝的重量损失明显小于奥齿泰和 3i 的非涂层基台螺丝（P<.05，曼-惠特尼检验）。
TiN 涂层基台螺丝具有更好的耐磨性，优于钛基台螺丝。结论是 TiN 涂层基台螺丝具有良好的耐磨性和低摩擦系数，可以减少预紧力的损失，有助于维持螺丝连接的稳定性。
