Final shade and whiteness: impact of various ultra-thin CAD/CAM veneers and tooth-colored resin substrates

作者：Yinghui Wang, Xia Wei, Linjuan Gao, Dingkun Liu, Xing Chen, Liujun Lin, Yu Pan, Hao Yu, Guang Hong, Hui Cheng · 发表于：BMC Oral Health · 年份：2025 · DOI：10.1186/s12903-025-05901-x · 被引用次数：4 · 研究领域：Dental materials and restorations、Dental Erosion and Treatment、Dental Health and Care Utilization

Achieving optimal color control in chairside CAD/CAM ultra-thin veneers, remains a significant challenge for dental clinicians and technicians. This study aims to investigate the effect of ultra-thin CAD/CAM medium translucency (MT) lithium disilicate veneers and tooth-colored resin substrates on final tooth shade and whiteness. Disk-shaped ceramic veneers (IPS e.max CAD MT, Ivoclar Vivadent, Liechtenstein) with a thickness of 0.3 mm were fabricated in BL2, BL3, BL4, B1, A1, A2, and A3 shades. Additionally, 4-mm thick resin substrates (Tetric N-Ceram, Ivoclar Vivadent, Liechtenstein) were prepared in A2, A3, A3.5, and A4 shades to simulate tooth-colored substrates. Veneer-resin composites were prepared by combining veneer specimens and resin substrates. Color coordinates of tooth-colored resin substrates (R), veneer-resin composites (C) and the shade guide tabs (G) were obtained using a spectroradiometer. Color differences of ΔE00(C-R), ΔE00(C-G) and ΔE00(R-G) were then calculated with the CIEDE2000 formula. The initial and final shades were considered matched when ΔE00(R-G) or ΔE00(C-G) was clinically acceptable or minimal. Additionally, whiteness differences (ΔWID) between R and C specimens were recorded. Two-way analysis of variance (ANOVA) was performed, followed by the Tukey HSD. The significance level was set at p < 0.05. Both the shades of resin substrates and veneer shades had significant effects on ΔE00(C-R) and ΔWID (p < 0.001), while no interaction effects were obs...