目的:研究氮化钛涂层对循环摘戴后圆锥型套筒冠固位力的影响.方法:使用精密数控车床制作标准金属内、外冠试件14 对,随机分成2 组(实验组和对照组),每组7 对,在实验组套筒冠内冠表面和外冠内面沉积2 μm氮化钛(TiN),未镀TiN组为对照组,测定2 组套筒冠经循环摘戴后固位力值.采用SPSS 13.0软件包对实验数据进行成组t检验统计分析.结果:镀TiN组套筒冠初始固位力较未镀膜组小, 2 组固位力随循环次数的增加而降低,未镀膜组固位力下降速度较镀膜组更为显著.镀TiN组套筒冠在循环3 000 次后固位力开始下降,3 000 次前和7 000 次后固位力下降平缓.结论:圆锥型套筒冠内、外冠沉积氮化钛涂层可以降低套筒冠固位力衰减速度,能够保持持久的固位力.%Objective:To evaluate the effect of TiN coating on retentive force of conus telescopic crowns after repeated insertion/separation tests. Methods: Fourteen pairs of standard metal specimens fabricated by precision Computer Numerical Control (CNC) Lathe were randomly divided into experimental group and control group, seven pairs in each group. The external surfaces of inner crowns and internal surfaces of outer crowns of experimental group were coated with a 2.0 μm titanium nitride (TiN) by multi-arc ion plating method. The group without titanium nitride coating was served as control. The retentive forces of two group telescopic crowns was investigated by repeated insertion/separation tests. Statistical analysis of group t-test was performed by SPSS 13.0 software package. Results: The results demonstrated that the initial retentive force of titanium nitride group in our study were lower than that of uncoated titanium nitride group. The retentive forces of two groups gradually decreased depending on the number of insertion/separation cycles and the rate of retention attenuation was found to be statistically significant. It was also shown that the retentive force of titanium nitride coating group began to decrease after 3 000 cycles and declined slowly not only before 3 000 cycles but also after 7 000 cycles. Conclusion: Titanium nitride coating deposited on external surface of inner crowns and internal surface of outer crowns can significantly decrease retention attenuation rate of conus telescopic crowns and maintain persistent retentive force.
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