Abstract
The aim of this in vitro study was to evaluate and compare the color stability of different esthetic restorative materials (one microfilled composite, one nanofilled composite, one nanoceramic composite, one microfilled hybrid composite, one microfilled hybrid composite, one nanohybrid Ormocer based composite and one supra-nano spherical hybrid composite) after exposure to different staining solutions (physiological saline, red wine, coffee). All materials were prepared and polymerized into silicon rings (2 mm × 6 mm × 8 mm) to obtain specimens identical in size. Thirty cylindrical specimens of each material were prepared. Specimens were immersed in staining solutions (physiological saline, coffee and red wine) over a 28-day test period. A colorimetric evaluation according to the CIE L*a*b* system was performed by a blind trained operator at 7, 14, 21, 28 days of the staining process. The Shapiro–Wilk test and ANOVA were applied to assess significant differences among restorative materials. A paired t-test was applied to test which CIE L*a*b* parameters significantly changed after immersion in staining solutions. All restorative materials showed significant color differences after immersion in coffee. Coffee caused a significant color change in all types of tested composite resins. Only Filtek Supreme XTE demonstrated a staining susceptibility to red wine; no other significant differences among the materials were demonstrated. Long-term exposure to some food dyes (coffee in particular) can significantly affect the color stability of modern esthetic restorative materials regardless of materials’ different compositions.
Highlights
Composite resins play an essential role in dental restoration, mostly in the anterior sector, because of its esthetic proprieties and for the good maneuverability and the acceptable biocompatibility [1,2]
A crucial property of esthetic restorative materials is their long-term color stability and an unacceptable color match is a primary reason for replacement of composite resin restoration [2]
Any aesthetic restorative material should duplicate the appearance of a natural tooth in color, and the success of an aesthetic restoration depends first on the color match and on the color stability of the material [3]
Summary
Composite resins play an essential role in dental restoration, mostly in the anterior sector, because of its esthetic proprieties and for the good maneuverability and the acceptable biocompatibility [1,2]. A crucial property of esthetic restorative materials is their long-term color stability and an unacceptable color match is a primary reason for replacement of composite resin restoration [2]. Due to their good aesthetic properties, resin composite materials are widely used in clinical practice. A major disadvantage is the staining and discoloration of the restorative material after prolonged exposure to the oral environment. This is due to the aging process in the oral environment
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