[微波与传统烧结法制备牙科氧化锆陶瓷的摩擦磨损性能研究]
[Study on friction and wear properties of dental zirconia ceramics processed by microwave and conventional sintering methods].
作者信息
Guoxin Hu, Ying Yang, Yuemei Jiang, Wenjing Xia
机构信息
Fuzhou Medical College, Nanchang University, Fuzhou 344000, China.
Dept. of Prosthodontics, Affiliated Stomatological Hospital of Nanchang University, Nanchang 330006, China.
出版信息
Hua Xi Kou Qiang Yi Xue Za Zhi. 2017 Apr 1;35(2):150-154. doi: 10.7518/hxkq.2017.02.008.
OBJECTIVE
This study evaluated the wear of an antagonist and friction and wear properties of dental zirconia ceramic that was subjected to microwave and conventional sintering methods.
METHODS
Ten specimens were fabricated from Lava brand zirconia and randomly assigned to microwave and conventional sintering groups. A profile tester for surface roughness was used to measure roughness of the specimens. Wear test was performed, and steatite ceramic was used as antagonist. Friction coefficient curves were recorded, and wear volume were calculated. Finally, optical microscope was used to observe the surface morphology of zirconia and steatite ceramics. Field emission scanning electron microscopy was used to observe the microstructure of zirconia.
RESULTS
Wear volumes of microwave and conventionally sintered zirconia were (6.940±1.382)×10⁻², (7.952±1.815) ×10⁻² mm³, respectively. Moreover, wear volumes of antagonist after sintering by the considered methods were (14.189±4.745)×10⁻², (15.813±3.481)×10⁻² mm³, correspondingly. Statistically significant difference was not observed in the wear resistance of zirconia and wear volume of steatite ceramic upon exposure to two kinds of sintering methods. Optical microscopy showed that ploughed surfaces were apparent in zirconia. The wear surface of steatite ceramic against had craze, accompanied by plough. Scanning electron microscopy showed that zirconia was sintered compactly when subjected to both conventional sintering and microwave methods, whereas grains of zirconia sintered by microwave alone were smaller and more uniform.
CONCLUSIONS: Two kinds of sintering methods are successfully used to produce dental zirconia ceramics with similar friction and wear properties. .
目的
本研究评估了采用微波烧结和传统烧结方法的牙科氧化锆陶瓷的对颌磨损情况以及摩擦磨损性能。
方法
用Lava牌氧化锆制作10个样本，并随机分为微波烧结组和传统烧结组。使用表面粗糙度轮廓仪测量样本的粗糙度。进行磨损试验，用滑石陶瓷作为对颌材料。记录摩擦系数曲线并计算磨损体积。最后，用光学显微镜观察氧化锆和滑石陶瓷的表面形态，用场发射扫描电子显微镜观察氧化锆的微观结构。
结果
微波烧结和传统烧结氧化锆的磨损体积分别为(6.940±1.382)×10⁻²、(7.952±1.815)×10⁻² mm³。此外，采用上述方法烧结后对颌材料的磨损体积相应为(14.189±4.745)×10⁻²、(15.813±3.481)×10⁻² mm³。两种烧结方法下，氧化锆的耐磨性和滑石陶瓷的磨损体积均未观察到统计学上的显著差异。光学显微镜显示氧化锆表面有明显的犁沟痕迹。滑石陶瓷的磨损表面有裂纹并伴有犁沟。扫描电子显微镜显示，传统烧结和微波烧结的氧化锆都烧结致密，而仅采用微波烧结的氧化锆晶粒更小且更均匀。
结论
两种烧结方法均成功制备出摩擦磨损性能相似的牙科氧化锆陶瓷。
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