Badarneh Abdelrahman, Eun Choi Joanne Jung, Lyons Karl, Porter Gemma, Waddell Neil, Chun Li Kai
Faculty of Dentistry, Sir John Walsh Research Institute, University of Otago, PO Box 56, Dunedin 9054, New Zealand; Faculty of Dentistry, Jordan University of Science and Technology, PO Box 3030, Irbid 22110, Jordan.
Faculty of Dentistry, Sir John Walsh Research Institute, University of Otago, PO Box 56, Dunedin 9054, New Zealand.
Dent Mater. 2022 May;38(5):e136-e146. doi: 10.1016/j.dental.2022.04.018. Epub 2022 Apr 13.
Investigate the effect of aging on the wear behavior of glazed vs polished monolithic zirconia and to establish if glazing provides protection against low temperature degradation.
40 1-mm-diameter spheres made from four differently treated monolithic zirconia (VITA YZ® HT); polished, polished-aged, glazed and glazed-aged (n = 10), were tested in a wear testing machine (UFW200) against bovine enamel in artificial saliva as per the following settings (ISO20808:2016): ball-on-disc configuration, 5 N vertical load, 0.1 m/s sliding speed, 400 m sliding distance and 37 °C temperature. Vertical substance loss (mm) wear of zirconia and enamel specimens was measured. Data were statistically analyzed with Kruskal-Wallis one-way ANOVA test (α > 0.05).
Glazed-aged zirconia specimens resulted in the greatest amount of enamel wear (0.823 mm ± 0.157) followed by glazed (0.729 mm ± 0.289), polished-aged (0.377 mm ± 0.201) then polished (0.247 mm ± 0.125). In the groups with the same surface finish, aging showed no statistical difference in wear (P > 0.008). Glazing resulted in a higher enamel wear compared with polishing that was statistically significant (P < 0.008) except when the polished specimens were aged and the glazed specimens were not aged.
Aging increases abrasiveness of monolithic zirconia regardless of the type of surface finish. The effect of aging is "latent" and only revealed under mechanical loading during wear simulation which increases surface roughness and wear by adversely affecting zirconia's mechanical properties, making it less capable to maintain its initial surface smoothness. The glaze layer may protect zirconia from LTD, however, it is susceptible to aging which further increases its abrasiveness.
研究老化对釉面与抛光整体式氧化锆磨损行为的影响，并确定釉面是否能提供低温降解防护。
采用四组经过不同处理的整体式氧化锆（维他YZ® HT）制作40个直径1毫米的球体；抛光、抛光老化、釉面和釉面老化（n = 10），在磨损试验机（UFW200）中按照以下设置（ISO20808:2016）以牛牙釉质为对象在人工唾液中进行测试：球盘配置、5 N垂直载荷、0.1 m/s滑动速度、400 m滑动距离和37°C温度。测量氧化锆和牙釉质试样的垂直物质损失（毫米）磨损。数据采用Kruskal-Wallis单因素方差分析进行统计分析（α > 0.05）。
釉面老化的氧化锆试样导致的牙釉质磨损量最大（0.823毫米±0.157），其次是釉面（0.729毫米±0.289）、抛光老化（0.377毫米±0.201），然后是抛光（0.247毫米±0.125）。在具有相同表面光洁度的组中，老化在磨损方面无统计学差异（P > 0.008）。与抛光相比，釉面导致更高的牙釉质磨损，具有统计学意义（P < 0.008），但抛光试样老化而釉面试样未老化的情况除外。
无论表面光洁度类型如何，老化都会增加整体式氧化锆的磨蚀性。老化的影响是“潜在的”，仅在磨损模拟过程中的机械载荷下才会显现，这会增加表面粗糙度并通过对氧化锆机械性能产生不利影响而导致磨损，使其难以维持其初始表面光滑度。釉面层可能会保护氧化锆免受低温降解，然而，它易受老化影响，这会进一步增加其磨蚀性。
