Department of Dental Biomaterials, Faculty of Dentistry, Mansoura University, Mansoura, 35516, Egypt.
Department of Restorative Dental Science, Vision Colleges, Jeddah, Saudi Arabia.
BMC Oral Health. 2022 Mar 27;22(1):96. doi: 10.1186/s12903-022-02136-y.
The purpose of this study was to evaluate the optical properties of nanohybrid Grandio (GR) and nanoceramic Lava Ultimate (LU) CAD/CAM restorative materials subjected to different beverage solutions and subsequently bleached.
Five groups of each restorative material (n = 20/group, shade A2-high translucent) were immersed in distilled water, coffee, tea, cola, and ginger for one week. Changes in whiteness index, translucency parameter, and color changes of the specimens were evaluated. The data of color measurements after staining, bleaching, and the residual differences were statistically analyzed using Kruskal-Wallis and Mann-Whitney U tests at the significance level of P < 0.05.
LU and GR revealed the highest differences in whiteness index after coffee staining (P < 0.001). GR revealed lower translucency parameter differences after staining with coffee than LU (P = 0.007). There were no significant differences in translucency changes between LU and GR after staining with tea, cola, or ginger (P > 0.05). LU revealed significantly greater color changes than GR after staining (P < 0.001).
LU nanoceramic CAD/CAM restorative material revealed higher color changes than GR nanohybrid material. Staining beverage solutions had a distinct influence on the optical properties of the tested CAD/CAM restorative materials.
本研究旨在评估纳米复合 Grandio（GR）和纳米陶瓷 Lava Ultimate（LU）CAD/CAM 修复材料的光学性能，以及它们在经过不同饮料溶液浸泡和随后漂白后的变化。
每组各有 5 种修复材料（n=20/组，A2-高半透明色）被分别浸泡在蒸馏水中、咖啡、茶、可乐和姜水中一周。评估了各试件的白度指数、半透明度参数和颜色变化。使用 Kruskal-Wallis 和 Mann-Whitney U 检验对染色、漂白后的颜色测量数据和残余差异进行统计分析，显著性水平为 P<0.05。
咖啡染色后，LU 和 GR 的白度指数差异最大（P<0.001）。GR 经咖啡染色后的半透明度参数差异低于 LU（P=0.007）。茶、可乐和姜水中染色后，LU 和 GR 的半透明度变化无显著差异（P>0.05）。LU 染色后的颜色变化明显大于 GR（P<0.001）。
与 GR 纳米复合材料相比，LU 纳米陶瓷 CAD/CAM 修复材料的颜色变化更大。染色饮料溶液对测试 CAD/CAM 修复材料的光学性能有明显影响。
