Shinohara Ryusuke, Ueda Kazuhiko, Watanabe Fumihiko
Functional Occlusal Treatment, Graduate School of Life Dentistry at Niigata, The Nippon Dental University.
Department of Crown and Bridge Prosthodontics, School of Life Dentistry at Niigata, The Nippon Dental University.
Dent Mater J. 2019 Feb 8;38(1):150-156. doi: 10.4012/dmj.2018-023. Epub 2018 Nov 17.
The purpose of this study was to investigate how differences in dental implant and screw materials affected screw loosening. Screws (pure titanium; Ti4S, titanium alloy; TiAS), blocks (Y-TZP; ZrB, pure titanium; Ti4B) and plates (Y-TZP; ZrP), representing abutment screws, implant bodies and superstructures, respectably, were used. Plates were fastened to blocks by screws using a torque of 20 N•cm, and the loosening torque was measured after cyclic loading. Tests was performed on 13 specimens per group, with four groups for loading at the eccentric point (9 mm from screw center) and one group at the centric point (3 mm from screw center). In eccentric point tests, Ti4S screws led to significantly more loosening than TiAS screws (p<0.01). The block material had no effect. For ZrBTi4S, there was no difference in loosening before and after the centric point tests. More loosening occurred for eccentric point than for centric point tests (p<0.05).
本研究的目的是调查牙种植体和螺钉材料的差异如何影响螺钉松动。分别使用代表基台螺钉、种植体主体和上部结构的螺钉（纯钛；Ti4S，钛合金；TiAS）、块体（Y-TZP；ZrB，纯钛；Ti4B）和板（Y-TZP；ZrP）。使用20 N•cm的扭矩通过螺钉将板固定到块体上，并在循环加载后测量松动扭矩。每组对13个样本进行测试，四组在偏心点（距螺钉中心9 mm）加载，一组在中心点（距螺钉中心3 mm）加载。在偏心点测试中，Ti4S螺钉导致的松动明显多于TiAS螺钉（p<0.01）。块体材料没有影响。对于ZrBTi4S，中心点测试前后的松动没有差异。偏心点测试比中心点测试发生更多的松动（p<0.05）。
