分层有色基底与高值不透明复合材料用于 CAD-CAM 整体陶瓷。
Layering of discolored substrates with high-value opaque composites for CAD-CAM monolithic ceramics.
机构信息
Graduate student, MSciD Post-Graduate Program in Dentistry, School of Dentistry, Meridional Faculty, IMED, Passo Fundo, Rio Grande do Sul State, Brazil.
Graduate student, MSciD and Phd Post-Graduate Program in Oral Sciences, Federal University of Santa Maria, UFSM, Santa Maria, Rio Grande do Sul, Brazil.
出版信息
J Prosthet Dent. 2021 Jul;126(1):128.e1-128.e6. doi: 10.1016/j.prosdent.2021.03.034. Epub 2021 May 26.
STATEMENT OF PROBLEM
Severely discolored substrates have been shown to limit the use of computer-aided design and computer-aided manufacturing (CAD-CAM) ceramic blocks because they provide insufficient color masking.
PURPOSE
The purpose of the in vitro study was to evaluate the effect of a layer of high-value opaque composite resin over discolored substrates to determine its masking ability with CAD-CAM ceramics.
MATERIAL AND METHODS
Six ceramic groups (n=10) were tested. A bilayer group of zirconia and porcelain served as the control. The CAD-CAM monolithic groups were translucent zirconia, zirconia-reinforced lithium silicate, lithium disilicate, leucite-reinforced glass-ceramic, and feldspathic ceramic. Five substrates were used: A1 (used as reference), A3.5, C4, and coppery and silvery metals. The substrates were separated as nonlayered or layered (with flowable or restorative opaque composite resins). The tested luting agents were white, opaque, and A1. Color differences (ΔE) were assessed with the CIEDE2000 formula. A 2-way ANOVA (α=.05) was used to detect significant differences in ΔE among the groups for each substrate. The results were compared with acceptability (1.77) and perceptibility (0.81) thresholds.
RESULTS
The flowable composite resin layer associated with A1 luting agent ensured ΔE lesser the than perceptibility thresholdwith the use of CAD-CAM monolithic ceramics, with the lowest values for zirconia-reinforced lithium silicate in substrates A3.5 (0.53) and C4 (0.32) and for leucite-reinforced glass-ceramic for coppery (0.49) and silvery (0.81) substrates (P<.001). The same benefit was observed when zirconia and porcelain was tested over the silvery substrate. The absence of substrate treatment only provided ΔE lesser than the acceptability threshold with CAD-CAM ceramics for the A3.5 background.
CONCLUSIONS
The application of a flowable opaque composite resin and the use of a shaded luting agent ensure masking with CAD-CAM monolithic ceramics.
问题陈述
严重变色的基底已被证明限制了计算机辅助设计和计算机辅助制造（CAD-CAM）陶瓷块的使用，因为它们提供的颜色遮蔽不足。
目的
本体外研究的目的是评估在变色基底上涂覆一层高值不透明复合树脂对 CAD-CAM 陶瓷的遮蔽能力。
材料和方法
测试了 6 个陶瓷组（n=10）。氧化锆和瓷的双层组作为对照。CAD-CAM 整体组为半透明氧化锆、氧化锆增强锂硅、锂二硅、透锂长石增强玻璃陶瓷和长石陶瓷。使用了 5 种基底：A1（用作参考）、A3.5、C4 以及铜色和银色金属。基底分为非分层或分层（使用流动性或修复性不透明复合树脂）。测试的粘固剂为白色、不透明和 A1。使用 CIEDE2000 公式评估颜色差异（ΔE）。使用 2 因素方差分析（α=.05）检测每个基底中各组之间的 ΔE 差异是否具有统计学意义。结果与可接受性（1.77）和可感知性（0.81）阈值进行比较。
结果
使用 CAD-CAM 整体陶瓷时，与 A1 粘固剂相关的流动复合树脂层确保 ΔE 小于可感知性阈值，在 A3.5（0.53）和 C4（0.32）基底中的氧化锆增强锂硅以及铜色（0.49）和银色（0.81）基底中的透锂长石增强玻璃陶瓷中具有最低值（P<.001）。在测试银色基底上的氧化锆和瓷时也观察到了相同的益处。仅对基底进行处理时，只有在 A3.5 背景下，CAD-CAM 陶瓷的 ΔE 才小于可接受性阈值。
结论
应用流动不透明复合树脂和使用遮色粘固剂可确保 CAD-CAM 整体陶瓷的遮蔽。
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