Department of Conservative Dentistry, Jordan University of Science and Technology, Irbid, Jordan.
J Prosthet Dent. 2010 Aug;104(2):105-13. doi: 10.1016/S0022-3913(10)60102-3.
Little is known about the wear behavior of ceramics opposed to unveneered zirconia and whether wear varies according to microstructure, surface toughness, and flexural strength of the ceramics.
The purpose of this study was to evaluate the 2-body wear resistance of 5 ceramics opposing unveneered zirconia ceramic.
Yttrium-stabilized zirconia, lithium disilicate glass ceramic, leucite-reinforced glass ceramic, fluorapatite glass ceramic, and nanofluorapatite glass ceramic specimens (n=8) were tested against standardized zirconia balls. Wear tests were performed in a dual-axis mastication simulator. Wear resistance was calculated by measuring the vertical and volumetric substance loss using a laser scanner. Specimen surfaces were evaluated at x50 and x500 magnification using SEM. Data were statistically analyzed using 1-way ANOVA and Fisher's exact test (alpha=.05).
Zirconia specimens demonstrated significantly lower vertical and volumetric loss than other ceramics (P<.05). The wear of fluorapatite and nanofluorapatite glass ceramics was significantly greater than that of leucite-reinforced and lithium disilicate glass ceramics (P<.05). SEM images showed no cracks or flaws in the zirconia and leucite-reinforced glass-ceramic specimens, indicating a mixture of attritional and adhesive wear. Other ceramic specimens exhibited cracks and chipped particle spaces which were consistent with fatigue wear. Zirconia demonstrated the lowest vertical and volumetric wear values. Leucite-reinforced and lithium disilicate glass ceramics demonstrated nonsignificant differences in volumetric wear, but these values were significantly lower than those observed for nanofluorapatite and fluorapatite glass ceramics (P<.05).
Wear varied according to the structure of the ceramic tested. Wear was of the fatigue type, and was significantly lowest in the zirconia specimens tested.
对于与无饰面氧化锆相对的陶瓷的磨损行为知之甚少，并且不知道磨损是否根据陶瓷的微观结构、表面韧性和弯曲强度而变化。
本研究的目的是评估 5 种与无饰面氧化锆陶瓷相对的陶瓷的 2 体耐磨性。
用 Y 稳定氧化锆、锂硅玻璃陶瓷、透锂长石增强玻璃陶瓷、氟磷灰石玻璃陶瓷和纳米氟磷灰石玻璃陶瓷试件（n=8）与标准化氧化锆球进行测试。磨损试验在双轴咀嚼模拟器中进行。通过使用激光扫描仪测量垂直和体积物质损失来计算耐磨性。使用 SEM 在 x50 和 x500 放大倍数下评估样品表面。使用单向方差分析和 Fisher 确切检验（alpha=.05）对数据进行统计分析。
氧化锆样品的垂直和体积损失明显低于其他陶瓷（P<.05）。氟磷灰石和纳米氟磷灰石玻璃陶瓷的磨损明显大于透锂长石增强和锂硅玻璃陶瓷（P<.05）。SEM 图像显示氧化锆和透锂长石增强玻璃陶瓷试件无裂纹或缺陷，表明存在磨损和粘着磨损的混合物。其他陶瓷试件显示出裂纹和剥落的颗粒空间，这与疲劳磨损一致。氧化锆表现出最低的垂直和体积磨损值。透锂长石增强和锂硅玻璃陶瓷在体积磨损方面没有显著差异，但这些值明显低于观察到的纳米氟磷灰石和氟磷灰石玻璃陶瓷（P<.05）。
磨损根据所测试的陶瓷结构而变化。磨损类型为疲劳型，所测试的氧化锆试件的磨损最低。
