Instituto e Centro de Pesquisas Odontológicas São Leopoldo Mandic, Dental Materials department, Campinas, Brazil.
Acta Odontol Latinoam. 2023 Aug 31;36(2):86-95. doi: 10.54589/aol.36/2/86.
During the manufacture of ceramic restorations there is an important step of finishing and polishing and the effects of different types of these procedures on the surface characteristics of ceramics are not known for sure.
To evaluate the effects of various surface treatments and immersion in coloring substances on the roughness, microhardness, and color stability of CAD-CAM monolithic ceramics.
The ceramics used were lithium disilicate reinforced with zirconium dioxide (Suprinity), lithium disilicate (E.max) or leucite (Empress). They were subjected to two surface treatments: glazing (group G) (n=20) or mechanical polishing (group P) (n=20). Then they were divided into two subgroups (n=10) to be treated with the staining substance (coffee or water). Roughness, microhardness and color were measured before and after treatment. Data were subjected to analysis of variance and multiple comparisons were performed with Tukey tests at 5% significance level.
Roughness was lower in all tested ceramics after polishing than after glazing. Microhardness was the same for polished and glazed E.max, higher in glazed than polished Empress, and higher in polished than glazed Suprinity. Analysis of the effects of glazing and polishing on the individual ceramics showed that the ΔE2000 and ΔWID data of the E.max ceramic subjected to polishing showed greater change. Mechanical polishing is a good option for surface treatment of monolithic ceramics.
Glazing was inferior and less satisfactory than polishing. Glazing generates changes that can lead to color instability.
评估不同表面处理和浸入着色物质对 CAD-CAM 整体陶瓷的粗糙度、显微硬度和颜色稳定性的影响。
使用的陶瓷为掺氧化锆的锂硅玻璃陶瓷（Suprinity）、锂硅陶瓷（E.max）或透锂长石陶瓷（Empress）。它们经过两种表面处理：上釉（G 组）（n=20）或机械抛光（P 组）（n=20）。然后将它们分为两个亚组（n=10），用染色物质（咖啡或水）处理。处理前后测量粗糙度、显微硬度和颜色。数据采用方差分析，并用 Tukey 检验进行多重比较，置信水平为 5%。
所有测试的陶瓷经抛光后粗糙度均低于上釉后。抛光后的 E.max 和上釉后的 E.max 显微硬度相同，上釉后的 Empress 比抛光后的 Empress 高，抛光后的 Suprinity 比上釉后的 Suprinity 高。对个别陶瓷的上釉和抛光效果分析表明，抛光后的 E.max 陶瓷的 ΔE2000 和 ΔWID 数据变化较大。机械抛光是整体陶瓷表面处理的较好选择。
上釉不如抛光，效果较差。上釉会产生导致颜色不稳定的变化。
