Abstract
The color stability of interim computer-aided design and computer-assisted manufacturing (CAD/CAM) materials has not been exhaustively investigated. The aim of this study was to compare the translucency (TP) and contrast ratio (CR) of CAD/CAM blocks and conventional interim materials, as well as the effects of varnish application and tooth-brushing on color stability after immersion in different staining solutions. Four hundred and eighty specimens were fabricated with four different interim materials (n = 120) and were divided into three experimental, and one control group (n = 30). The color measurements were taken at the initial time (T0), 24 h (T1), 7 days (T2), and 30 days (T3) after immersion in different solutions. CIEDE2000 (ΔE00) values were analyzed with ANOVA and Fischer’s LSD test with a 95% confidence interval. The relationship between TP and CR was analyzed with a Pearson correlation. All interim materials showed a significant difference (p < 0.05) in color change after 30 days. Results showed that polyethyl methacrylate resins (PEMA) had the highest stability over time. The TP and CR were statistically significant (p < 0.05). It was observed that brushing improved the color stability but the ΔE00 were the highest when the varnish alone or varnish and brushing were used, except in the bis-acryl group, in which varnish and brushing decreased the color stainability.
Highlights
Interim materials should have appropriate mechanical, biological and aesthetic properties until the cementation of the definitive restoration [1,2,3,4]
Regarding the stability of the materials tested, ∆E00 (T3) values showed that polyethyl methacrylate resins (PEMA) had the highest stability over time, followed by polymethyl methacrylate resins (PMMA), PMMA blocks for computer-aided design and computer-assisted manufacturing (CAD/CAM), and bis-acryl, which obtained the greatest color change (Table 3)
Four materials were used (PEMA, PMMA, PMMA blocks for CAD/CAM, and bis-acryl); each material was divided into four groups, which were exposed to different surface treatments and immersed in six staining solutions
Summary
Interim materials should have appropriate mechanical, biological and aesthetic properties until the cementation of the definitive restoration [1,2,3,4]. Powder and liquid methacrylate resins and paste–paste composite resin-based materials have been used in recent years to manufacture interim restorations [5,6]. These materials can be polymerized by different reactions (chemical, light or dual reactions) that are activated by one or several initiators (benzoyl peroxide activated by a tertiary amine or camphorquinone) [1,5]. One of the drawbacks of interim materials when exposed to the oral environment is their propensity to change color. The degree of color change is affected by exogenous and endogenous factors. Exogenous factors include patient habits, such as diet, tooth brushing or staining solutions, namely coffee, red wine, and black tea, among others
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