在变色基底上分层树脂复合材料可确保整体陶瓷的遮盖能力。

Resin composite layering on discolored substrates ensures masking ability for monolithic ceramics.

机构信息

Post-Graduate Program in Oral Sciences (Prosthodontics Units), Faculty of Odontology, Federal University of Santa Maria (UFSM), Santa Maria, Brazil.

Post-Graduate Program in Oral Sciences (Prosthodontics Unit), Faculty of Odontology, Federal University of Santa Maria (UFSM), Santa Maria, Brazil.

出版信息

J Esthet Restor Dent. 2023 Sep;35(6):860-868. doi: 10.1111/jerd.13066. Epub 2023 May 20.

DOI:10.1111/jerd.13066

PMID:37209028

Abstract

OBJECTIVE

the aim of this study was to evaluate the effect of resin composite layering on discolored substrates to obtain masking ability with monolithic ceramics.

MATERIALS AND METHODS

Four groups (n = 8) of computer-aided design/computer aided manufacturing (CAD/CAM) monolithic ceramics, shade A1, with thicknesses of 1.0 and 1.5 mm, were tested: feldspathic (FC), leucite-reinforced (LC), lithium disilicate-reinforced (LD), and translucent zirconia (5YSZ). Five substrates were used: A1 (used as reference), A3.5, C4, and coppery and silvery metals. The substrates were separated as non-layered or layered (with flowable opaque resin composite (FL), white opaque restorative resin composite (WD), and A1-shaded opaque restorative resin composite (A1D)). Resin composite layers of 0.5 and 1.0 mm were tested. The try-in paste, shade A1, was used as a luting agent. Translucency parameter (TP ) was assessed for the ceramics. Color differences (∆E ) were assessed for the restorative ceramics and resin composite layers over discolored substrates with the CIEDE2000 formula. The results were compared statistically, and descriptively with acceptability (AT, 1.77) and perceptibility (PT, 0.81) thresholds.

RESULTS

Feldspathic showed the highest TP (for both ceramic thicknesses) and LD the lowest (for 1.5 mm of ceramic thickness) (P < 0.001). For substrate A3.5, layering with 1.0 mm of A1D or WD ensured ∆E below PT for all ceramics tested (P < 0.001). The use of 0.5 mm of FL or 1.0 mm of A1D associated with ceramics LC, LD, and 5YSZ ensured ∆E below AT for substrates C4 and coppery metal (P < 0.001). Silvery background layered with 0.5 mm of FL presented ∆E below AT for all ceramics and ∆E below PT for lithium disilicate of 1.0 mm of thickness (∆E = 0.72).

CONCLUSIONS

Layering severely discolored substrates with selected opaque resin composites ensures masking ability for restoration with CAD/CAM monolithic ceramics.

CLINICAL SIGNIFICANCE

Severely discolored substrates are predictably restored with monolithic CAD/CAM ceramics by performing a previous layering of the substrate with opaque resin composite.

摘要

目的

本研究旨在评估树脂复合材料分层对有色基底的影响，以获得整体陶瓷的遮蔽能力。

材料与方法

对 4 组（每组 8 个）计算机辅助设计/计算机辅助制造（CAD/CAM）整体陶瓷（A1 色调）进行了测试，厚度分别为 1.0 和 1.5mm：长石质（FC）、锂辉石增强型（LC）、锂硅增强型（LD）和半透明氧化锆（5YSZ）。使用了 5 种基底：A1（用作参考）、A3.5、C4、铜色和银色金属。基底分为未分层或分层（使用流动型不透明树脂复合材料（FL）、白色不透明修复树脂复合材料（WD）和 A1 色调不透明修复树脂复合材料（A1D））。测试了 0.5 和 1.0mm 的树脂复合材料层。使用试戴糊剂 A1 色调作为粘固剂。评估了陶瓷的半透明度参数（TP）。使用 CIEDE2000 公式评估有色基底上修复陶瓷和树脂复合材料层的色差（∆E）。使用可接受性（AT，1.77）和可感知性（PT，0.81）阈值进行了统计学和描述性比较。

结果

长石质陶瓷在两种陶瓷厚度下均表现出最高的 TP，而 LD 陶瓷在 1.5mm 陶瓷厚度下表现出最低的 TP（均 P<0.001）。对于 A3.5 基底，用 1.0mm 的 A1D 或 WD 分层可确保所有测试陶瓷的 ∆E 低于 PT（均 P<0.001）。对于 C4 基底和铜色金属，使用 0.5mm 的 FL 或 1.0mm 的 A1D 与 LC、LD 和 5YSZ 陶瓷结合使用可确保 ∆E 低于 AT（均 P<0.001）。对于银色基底，用 0.5mm 的 FL 分层可使所有陶瓷的 ∆E 低于 AT，而对于 1.0mm 厚度的锂硅陶瓷，∆E 低于 PT（∆E=0.72）。