Pereira Carolina-Nemesio-de Barros, Magalhães Cláudia-Silami, Lages Frederico-Santos, Ferreira Raquel-da Conceição, da Silva Emerson-Hamilton, da Silveira Rodrigo-Richard, Corrêa Elaine-Carballo-Siqueira, Fantini Cristiano-Leite, Moreira Allyson-Nogueira
PhD, Professor, Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Minas Gerais, Belo Horizonte, Brazil.
PhD, Professor, Department of Social and Preventive Dentistry, Faculty of Dentistry, Federal University of Minas Gerais, Belo Horizonte, Brazil.
J Clin Exp Dent. 2021 Nov 1;13(11):e1068-e1075. doi: 10.4317/jced.58630. eCollection 2021 Nov.
To assess whether glass-ceramic shade, thickness and translucency affect degree of conversion (DC) and Knoop microhardness (KHN) of resin cements photoactivated using light-emitting diode (LED) or quartz-tungsten-halogen (QTH) units.
Glass-ceramic blocks were cut (2, 3 and 4mm) and sintered. For DC FT Raman spectroscopy (n=3), film specimens of cements (RelyX ARC, U200, Veneer, C&B) were obtained. For KHN test (n=3), cements were inserted in cylindrical matrix and covered by polyester strip. Specimens were photoactivated (30s) using LED or QTH according to each group: direct photoactivation (DP), interposing ceramic specimens or no photoactivation (NP). Data were analysed by ANOVA and Tukey's test, Kruskal-Wallis and Dunn's tests (<0.05).
Ceramic features had significant effect on DC of RelyX ARC, U200 and Veneer (<0.0017). Light source had no effect (=0.9512). C&B and Veneer had higher DC, followed by dual cements. NP dual cements showed the lowest DC. For KHN, ceramic shade (=0.1717) and light source (=0.1421) were not significant, but ceramic translucency, thickness and resin cement were significant (=0.0001). KHN was higher for U200 followed by ARC, and lowest for Veneer.
DC was affected by ceramic shade, translucency and thickness. KHN was dependent on ceramic translucency and thickness. Higher DC and KHN were achieved for dual-cured cements photoactivated through 2mm-thick low translucent or 3mm-thick high translucent glass-ceramic. Cementation, composite resin cements, dental curing lights, glass ceramics.
评估玻璃陶瓷的色泽、厚度和半透明度是否会影响使用发光二极管（LED）或石英钨卤素（QTH）光固化设备光激活的树脂水门汀的转化率（DC）和努氏显微硬度（KHN）。
将玻璃陶瓷块切割成2毫米、3毫米和4毫米厚并进行烧结。对于DC，采用傅里叶变换拉曼光谱法（n = 3）获取水门汀（RelyX ARC、U200、Veneer、C&B）的薄膜样本。对于KHN测试（n = 3），将水门汀插入圆柱形模具中，并用聚酯条覆盖。根据每组情况，使用LED或QTH对样本进行30秒的光激活：直接光激活（DP）、插入陶瓷样本或无光激活（NP）。数据通过方差分析和Tukey检验、Kruskal-Wallis检验和Dunn检验进行分析（<0.05）。
陶瓷特性对RelyX ARC、U200和Veneer的DC有显著影响（<0.0017）。光源无影响（=0.9512）。C&B和Veneer的DC较高，其次是双固化水门汀。NP双固化水门汀的DC最低。对于KHN，陶瓷色泽（=0.1717）和光源（=0.1421）无显著影响，但陶瓷半透明度、厚度和树脂水门汀有显著影响（=0.0001）。U200的KHN较高，其次是ARC，Veneer的最低。
DC受陶瓷色泽、半透明度和厚度的影响。KHN取决于陶瓷半透明度和厚度。通过2毫米厚的低半透明或3毫米厚的高半透明玻璃陶瓷光激活的双固化水门汀可实现更高的DC和KHN。粘结、复合树脂水门汀、牙科固化灯、玻璃陶瓷。
