title: Esthetic restorative material shade changes due to photopolymerization.
abstract: This study sought to measure color values (before and after photopolymerization) and variations of A1 shade polymeric dental restorative materials. The L*a*b* values of polymeric dental restorative material disks were measured by a spectrophotometer with the specular component excluded (SCE) geometry under D65 illumination over a standardized white background before and after photopolymerization. Color differences (DeltaE*ab) due to polymerization were calculated using the CIE Lab color-difference formula. DeltaE*ab indicates differences between two colors in the L*a*b* color space. In this system, L*, a*, and b* indicate lightness, red-green, and yellow-blue, respectively. Color differences (DeltaE*ab) were calculated by the equation DeltaE*ab = [(DeltaL*)2 + (Deltaa*)2 + (Deltab*)2]1/2. Eight resin composites, three flowable resin composites (FRCs), and two resin-modified glass ionomers (RMGIs) were utilized; L*a*b* and DeltaE*ab values of the test groups were analyzed using ANOVA and Newman-Keuls multiple comparison tests. DeltaE*ab values before and after photopolymerization ranged from 3.01-17.76. All RMGI and two FRC materials displayed greater color changes than the resin composites (p < 0.05). Photopolymerization produced measurable increases and decreases in lightness. Yellow-blue (b*) values decreased in all test groups after polymerization, while most red-green (a*) values increased. Color differences between polymerized A1 shade materials ranged from 0.76-25.41 DeltaE*ab. The color difference between the test materials and a widely used tooth shade guide (the Vita Lumin) was averaged at 12.66 DeltaE*ab.
authors.affiliation: Department of Adult Restorative Dentistry, University of Nebraska Medical Center, College of Dentistry, Lincoln, NE, USA.
authors.forename: Hidehiko
authors.initials: H
authors.lastname: Watanabe
authors.forename: David
authors.initials: D
authors.lastname: Covey
mesh_terms: D000704:Analysis of Variance; D003116:Color / Q000592:standards; D003124:Colorimetry; D003188:Composite Resins / Q000737:chemistry / Q000528:radiation effects*; D017267:Dental Prosthesis Design; D003793:Dental Restoration, Permanent; D003801:Dental Veneers; D005899:Glass Ionomer Cements / Q000737:chemistry / Q000528:radiation effects*; D006801:Humans; D008027:Light; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D017797:Prosthesis Coloring / Q000592:standards*
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements