Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Prosthodont. 2018 Feb;27(2):201-211. doi: 10.1111/jopr.12740. Epub 2018 Jan 9.
Zirconia ceramic is a popular trend in esthetic and restorative dentistry. Computer-aided design/computer-aided manufacturing (CAD/CAM) systems have been well developed to fabricate zirconia frameworks and restorations with acceptable mechanical properties. Zirconia ceramics have excellent optical characteristics; however, achieving optimal esthetic outcomes with zirconia-based restorations is still challenging due to multiple effective factors on the final color. These factors are different layers of a zirconia-based restoration and its underlying structures including: dental substrate, cement, zirconia coping, veneering ceramic, and glaze. Moreover, the laboratory procedure of these restorations' fabrication is another effective factor on the resultant color. Unpredictable esthetic results may be obtained without estimation of the role of each factor and its effect on the final color. This review discussed the color aspect of zirconia-based restorations according to these factors and based on the literature. In the past decade, investigators have been concerned with the shade reproduction with zirconia-based restorations; however, there are no sufficient clinical guidelines on how to reproduce the appearance of natural teeth with these restorations. Zirconia-based restorations have presented a new chance for accomplishing optimum esthetics. Nonetheless further investigations are needed on these restorations to establish clinical guidelines on esthetics.
氧化锆陶瓷在口腔美学和修复领域是一种流行趋势。计算机辅助设计/计算机辅助制造（CAD/CAM）系统已得到很好的发展，可以制造出具有可接受机械性能的氧化锆基支架和修复体。氧化锆陶瓷具有优异的光学特性；然而，由于最终颜色受多种有效因素的影响，使用氧化锆基修复体获得最佳美学效果仍然具有挑战性。这些因素包括氧化锆修复体的不同层及其底层结构，如：牙本质基底、粘结剂、氧化锆全冠、饰面陶瓷和釉料。此外，这些修复体制作的实验室程序也是影响最终颜色的另一个有效因素。如果不估计每个因素及其对最终颜色的影响，就可能会得到不可预测的美学效果。本文根据文献综述了氧化锆基修复体的颜色方面，讨论了这些因素对修复体颜色的影响。在过去的十年中，研究人员一直关注氧化锆基修复体的颜色再现问题；然而，目前还没有足够的临床指南来指导如何使用这些修复体再现天然牙齿的外观。氧化锆基修复体为实现最佳美学效果提供了新的机会。然而，仍需要对这些修复体进行进一步的研究，以建立关于美学的临床指南。
