Abstract
The objective was to evaluate the color stability of ceramic veneers luted with resin cements and pre-heated composite resins (60oC) for 12 months, and determine the degree of conversion (DC) of the luting agents. Two resin cements (AllCem Veneer, light-cured (LRC) and AllCem, dual-cured (DRC)] and three composite resins [Z100 (MNCR-minifilled), Herculite Classic (MHCR-micro-hybrid) and Durafill (MCCR-microfilled)] were used for cementing 0.8-mm-thick lithium-silicate glass-ceramic laminates (Suprinity, shade B2-HT, Vita) on bovine enamel (n=10). The specimens were stored at 37oC in distilled water. CIELab parameters were determined at 24h after luting (baseline), 7, 30, 90, 180 days and 12 months. Three specimens were prepared for DC evaluation, performed by micro-Raman spectroscopy. Data were analyzed by ANOVA and Tukey's test (a=5%). For ΔEab and ΔE00, there were significant differences for luting material (p<0.001), time (p<0.001), and double interaction (p<0.001). The groups cemented with MHCR (1 year), MCCR (90 days and 1 year) and MCCR-PH (1 year) were the ones with ΔE values greater than the acceptability threshold. All other groups maintained their ΔE lower than the acceptability threshold after 1 year in distilled water. Regarding DC, there were no significant differences (p=0.127) among the materials. Non-significant negative correlations were observed between the mean ΔEab and DC (R=-0.65) and ΔE00 and DC (R=-0.64). A significant positive correlation was observed mean ΔEab and ΔE00 (R=0.99). It was concluded that the different luting agents influenced the final color of the restorations. The heating of the composite resins did not affect their DC.
Highlights
One of the major challenges for modern dentistry is to achieve the perfect optical properties of natural teeth with artificial materials [1]
Luting material is a determinant factor that influences the final color of thin ceramic veneers [19]
The results for luting materials are in accordance with those described in the literature, rejecting the first hypothesis, since the different luting agents influenced the final color of thin ceramic veneers
Summary
One of the major challenges for modern dentistry is to achieve the perfect optical properties of natural teeth with artificial materials [1]. The optical behavior of a ceramic restoration is determined by the combination of the underlying tooth structure color, the thickness of the ceramic layers, and the color of the cement [2]. It is essential to understand how the color of a cemented ceramic restoration may change after aging in the oral cavity. Cement layer discoloration is an important aspect to be considered when luting ceramic restorations. When compared to ceramic materials, the cement layer is chemically less stable and may undergo color changes over time. The perception of color alteration due to resin cement aging may be different according to the ceramics’ translucency. Clinicians should understand the factors affecting final result of indirect restorations and carefully choose restorative materials in order to achieve optimal aesthetic results [3]
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