Effect of Ceramic Thickness and Luting Agent Shade on the Color Masking Ability of Laminate Veneers

Abstract

The main objective of the study was to recognize the effect of ceramic thickness and luting agent on the extent to which the restoration masks color variations that may be present in the underlying dental structure. Two pressable ceramics were used: Lithium disilicate reinforced (IPS e.max- Ivoclar Vivadent) and Leucite reinforced (Cergo- Dentsply). Fifteen ceramic discs were manufactured from each ceramic and divided into three groups, according to the thickness (0.5, 1, 1.5 mm). To simulate the color of a dark underlying dental structure, background discs, color C3, with 20 mm diameter, were made using resin composite. The ceramic discs with varying thicknesses were seated on the dark background of the resin composite with either resinous opaque cement or resinous cement. The color parameters were determined by the CIE Lab system of colors using a spectrophotometer and color differences (ΔE) were calculated. The results were then statistically analyzed, using ANOVA test and Tukey HSD test. The ΔE values of both ceramic systems were affected by both the luting agent and the ceramic thickness (P < 0.05). The use of an opaque luting agent resulted in an increase of the ΔE* values for all ceramics tested, regardless of the thickness. For the 1.5-mm thick veneers, higher values in the color parameters were obtained for both ceramic materials. The color masking ability of ceramics used for laminate veneers is significantly affected by the thickness of the ceramic and the shade of the luting agent used.

Optical properties of contemporary monolithic CAD‐CAM restorative materials at different thicknesses

“…According to manufacturer's, one of the common indications for all tested materials is a veneer restoration. Therefore, thicknesses of 0.5 and 1.0 mm were chosen in the present study because the thickness of veneer restorations usually lies between these two values …”

“…Therefore, thicknesses of 0.5 and 1.0 mm were chosen in the present study because the thickness of veneer restorations usually lies between these two values. 31,51 The shade of remaining tooth structure or the core foundation material should be considered when choosing the esthetic restorative material. 25 Highly translucent restorative materials may be used for thin restorations to replace enamel tissue with no discoloration.…”

Evaluation of the Final Color of Ceramic Veneers with Different Self-Adhesive Resin Cements

“…Therefore, the selection of the substrate that is most related to the clinical conditions is considered. Nonetheless, standardization of the color and surface properties of substrate is difficult, most research studies used composite substrate [5,9,10,13] or no substrate [4,19,21]. Some studies used human molar [3,17] or bovine teeth [2] to stimulate clinical conditions.…”

Effect of porcelain thickness and translucency on the final shade of IPS e.max CAD overlaying a dark substrate.

“…The results of this study show that as porcelain thickness is reduced from 1.0mm to ultimately 0.3mm, a consistent increase in ΔE * ab becomes apparent, independent of the translucency level. Previous studies have been conducted on how thickness can affect the optical properties of all-ceramic systems (Begum et al, 2014;Chaiyabutr et al, 2011;de Azevedo Cubas et al, 2011;Dozic et al, 2003;W. Kang et al, 2018;Kurklu et al, 2013;Nakamura, Saito, Fuyikawa, & Ishigaki, 2002;Niu et al, 2014;O.…”

“…Matching human teeth with restorations proves challenging since tooth appearance and shade is an intricate process, involving translucency, opacity, fluorescence, surface texture, and lighting conditions (Begum, Chheda, Shruthi, & Sonika, 2014;O. Ozturk et al, 2008;Uludag, Usumez, Sahin, Eser, & Ercoban, 2007;Vichi, Louca, Corciolani, & Ferrari, 2011).…”