OBJECTIVES To evaluate two-body wear of three zirconia ceramics stabilized with 3, 4 and 5mol% yttria and to compare their wear behavior with that of a lithium-disilicate glass-ceramic. METHODS Sixteen rectangular-shaped specimens made from three grades of zirconia ceramics and a lithium-disilicate glass-ceramic were polished and dynamically loaded in a chewing simulator (2kg vertical load, 2.1Hz) under water at 90°C for 1.2×106 cycles (about 7 days) in the ball-on-plate mode against steatite antagonists. Surface roughness was measured before and after wear testing. Wear tracks were scanned with a non-contact 3D profilometer and super-impositions were used to determine wear loss of the antagonists. Wear surfaces were imaged by SEM. XRD and micro-Raman spectroscopy were used to characterize phase transformation and stress status in the worn and unworn areas of the zirconia ceramics. RESULTS Independent of fracture toughness, strength and aging-susceptibility, the three zirconia ceramics showed a similar and limited amount of wear (∼10μm in depth) and were more wear-resistant than the lithium-disilicate glass-ceramic (∼880μm in depth). Abrasive wear without obvious cracks was observed for all investigated zirconias, whereas the glass-ceramic with a lower fatigue threshold and high susceptibility to surface dissolution exhibited significant abrasion, fatigue and corrosion wear. All three zirconia ceramics yielded a lower antagonist wear than the glass-ceramic and no significant differences were found between the zirconia ceramics. SIGNIFICANCE In the context of this study, high-translucent zirconia ceramics stabilized with a higher yttria content, recently introduced in the dental field, were as wear-resistant and antagonist-friendly as conventional high-strength zirconia and suitable for monolithic restorations.

中文翻译：

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高透明的氧化钇稳定的氧化锆陶瓷具有耐磨性和拮抗性。

目的评估三种氧化钇稳定在3％，4％和5％（摩尔）的氧化锆陶瓷的二体磨损，并将其与二硅酸锂玻璃陶瓷的磨损性能进行比较。方法抛光十六种由三种等级的氧化锆陶瓷和二硅酸锂玻璃陶瓷制成的矩形标本，并在90°C的水中于咀嚼模拟器（2kg垂直载荷，2.1Hz）中将其动态加载1.2×106个循环（约7天）以球涂方式对抗滑石拮抗剂。在磨损测试之前和之后测量表面粗糙度。用非接触式3D轮廓仪扫描磨损轨迹，并使用超叠加确定拮抗剂的磨损量。磨损表面通过SEM成像。XRD和显微拉曼光谱用于表征氧化锆陶瓷磨损和未磨损区域的相变和应力状态。结果与断裂韧性，强度和时效敏感性无关，这三种氧化锆陶瓷显示出相似且有限的磨损量（深度约10μm），并且比二硅酸锂玻璃陶瓷（深度约880μm）具有更高的耐磨性。 。在所有研究的氧化锆中均观察到无明显裂纹的磨料磨损，而疲劳阈值较低且对表面溶解的敏感性较高的玻璃-陶瓷表现出明显的磨损，疲劳和腐蚀磨损。所有三种氧化锆陶瓷的拮抗剂磨损均低于玻璃陶瓷，并且在氧化锆陶瓷之间未发现显着差异。意义在这项研究中，