种植体-基台-螺钉复合体中的预负荷、摩擦系数和螺纹摩擦力
Preload, Coefficient of Friction, and Thread Friction in an Implant-Abutment-Screw Complex.
作者信息
Wentaschek Stefan, Tomalla Sven, Schmidtmann Irene, Lehmann Karl Martin
出版信息
Int J Prosthodont. 2017 Nov/Dec;30(6):542-544. doi: 10.11607/ijp.5286.
PURPOSE
To examine the screw preload, coefficient of friction (COF), and tightening torque needed to overcome the thread friction of an implant-abutment-screw complex.
MATERIALS AND METHODS
In a customized load frame, 25 new implant-abutment-screw complexes including uncoated titanium alloy screws were torqued and untorqued 10 times each, applying 25 Ncm.
RESULTS
Mean preload values decreased significantly from 209.8 N to 129.5 N according to the number of repetitions. The overall COF increased correspondingly. There was no comparable trend for the thread friction component.
CONCLUSION
These results suggest that the application of a used implant-abutment-screw complex may be unfavorable for obtaining optimal screw preload.
目的
研究种植体-基台-螺钉复合体克服螺纹摩擦力所需的螺钉预紧力、摩擦系数（COF）和拧紧扭矩。
材料与方法
在定制的加载框架中，对25个包括未涂层钛合金螺钉的新型种植体-基台-螺钉复合体进行扭矩施加和松开，各进行10次，施加扭矩为25 Ncm。
结果
根据重复次数，平均预紧力值从209.8 N显著降至129.5 N。总体摩擦系数相应增加。螺纹摩擦分量没有类似趋势。
结论
这些结果表明，使用过的种植体-基台-螺钉复合体可能不利于获得最佳螺钉预紧力。
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