【摘要】 目的:探究人工唾液环境下两种椅旁混合陶瓷树脂渗透陶瓷(PICN)和树脂纳米瓷(RNC)的摩擦磨损行为。方法:采用纳米力学测试仪对PICN、RNC和牙釉质进行压入测试和蠕变测试,评估材料的纳米力学性能和粘弹性性能。采用微动摩擦磨损测试仪对PICN、RNC和牙釉质在人工唾液环境下进行磨损测试,测试参数如下:法向载荷(Fn)为50N,往复幅度(D)为500μm,往复频率(F)为2Hz,循环次数(N)为10,000次。通过白光干涉三维形貌仪获得磨损深度,扫描电子显微镜观察磨斑形貌和损伤特征,分析磨损机制及耐磨损性。结果:平均弹性模量和塑性指数均为牙釉质>PICN>RNC,弹性回复率为RNC>PICN>牙釉质,人工唾液环境下最大磨损深度为PICN>RNC>牙釉质。结论:与RNC相比,PICN的纳米力学性能和粘弹性性能更接近牙釉质。两种混合陶瓷的耐磨性都小于牙釉质的耐磨性,但RNC的耐磨性与牙釉质的耐磨性更匹配,这可为临床选择修复材料提供参考。更多还原

【Abstract】 Objective: To evaluate wear resistance of two kinds of dental chair side hybrid ceramics(PICN and RNC under artificial saliva environment. Methods: Nanoindentations were applied on PICN, RNC and enamel samples using the nanomechanical tester equipped with a Berkovich diamond tip. In vitro two-body wear tests were performed with the ball-on-flat configuration using a reciprocal horizontal fretting tribometer under artificial saliva environment. The load force(50 N), the reciprocating amplitude(500 μ m), the frequency(2 Hz) and the test cycle(10,000 cycles) were selected as the test parameters. Wear scars were observed by 3-D profile microscopy and scanning electron microscope(SEM). Results: Elastic modulus and plasticity index are both enamel>PICN>RNC, and elastic recovery rate is RNC>PICN>enamel. The maximum wear depth under artificial saliva environment is PICN>RNC>enamel. Conclusion:Compared with those of RNC, the nanomechanical properties and viscoelastic properties of PICN are closer to enamel.Wear resistance of the investigated hybrid ceramics is enamel>RNC>PICN, providing references for clinical selection of restoration materials.更多还原