Can we use the translucency parameter to predict the CAD/CAM ceramic restoration aesthetic?

Jie Wang; Jiawei Yang; Kaige Lv; Hongming Zhang; Hui Huang; Xinquan Jiang

doi:10.1016/j.dental.2023.01.002

Can we use the translucency parameter to predict the CAD/CAM ceramic restoration aesthetic?

Dent Mater. 2023 Mar;39(3):e1-e10. doi: 10.1016/j.dental.2023.01.002. Epub 2023 Feb 24.

Authors

Jie Wang¹, Jiawei Yang¹, Kaige Lv¹, Hongming Zhang¹, Hui Huang², Xinquan Jiang³

Affiliations

¹ Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai, China; College of Stomatology, Shanghai Jiao Tong University, Shanghai, China; National Center for Stomatology, Shanghai, China; National Clinical Research Center for Oral Diseases, Shanghai, China; Shanghai Key Laboratory of Stomatology, Shanghai, China; Shanghai Research Institute of Stomatology, Shanghai, China.
² Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai, China; College of Stomatology, Shanghai Jiao Tong University, Shanghai, China; National Center for Stomatology, Shanghai, China; National Clinical Research Center for Oral Diseases, Shanghai, China; Shanghai Key Laboratory of Stomatology, Shanghai, China; Shanghai Research Institute of Stomatology, Shanghai, China. Electronic address: huanghui_68@126.com.
³ Department of Prosthodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University, School of Medicine, Shanghai, China; College of Stomatology, Shanghai Jiao Tong University, Shanghai, China; National Center for Stomatology, Shanghai, China; National Clinical Research Center for Oral Diseases, Shanghai, China; Shanghai Key Laboratory of Stomatology, Shanghai, China; Shanghai Research Institute of Stomatology, Shanghai, China. Electronic address: xinquanjiang@aliyun.com.

PMID: 36841746
DOI: 10.1016/j.dental.2023.01.002

Abstract

Objectives: To evaluate the effects of background color, ceramic type and coping thickness on masking ability (ΔE) and translucency parameter (TP) of CAD/CAM lithium disilicate glass-ceramic/monolithic zirconia and, to determine the correlations between coping thickness, TP and ΔE.

Methods: A total of 120 ceramic specimens (2 mm, 1 mm and 0.5 mm thickness; n = 10) of four CAD/CAM ceramics: IPS e.max, IPS ZirCAD, Upcera Li CAD and Upcera TT CAD, were studied. Specimens were tested over nine fabricated backgrounds: A1, A2, A3.5, ND2 and ND7 shade resin-based composites, cobalt-chromium alloy (CC), medium precious alloy (MPA), black (B) and white (W). CIELab values (L*, a* and b*), color difference (ΔE) and translucency parameter (TP) were measured and calculated using a digital spectrophotometer (color i7, X-Rite, Pantone®). Data were analyzed using the Shapiro-Wilk test, one-way ANOVA, three-way ANOVA, independent t-tests and Tukey post-hoc tests (p < 0.05).

Results: 2 mm CAD/CAM ceramics showed ideal color matching (ΔE<2.6) over different backgrounds, except for CC, B and W backgrounds. Monolithic zirconia had lower ΔE values than lithium disilicate glass-ceramics. ΔE and TP values significantly reduced with the increased coping thickness (p < 0.05). Regardless of ceramic type and thickness, a strong TP-SD of ΔE correlation was observed.

Significance: CAD/CAM ceramic restoration color was significantly affected by background color, ceramic type and coping thickness. TP is a promising predictor for appropriate ceramic selection to receive an acceptable CAD/CAM ceramic restoration aesthetic.

Keywords: Color; Coping thickness; Glass-ceramic; Translucency; Zirconia.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Ceramics*
Chromium Alloys
Computer-Aided Design
Esthetics, Dental*

Substances

zirconium oxide
Chromium Alloys