Assessment of changes in color and color parameters of light-cured composite resin after alternative polymerization methods

• Published in: European journal of dentistry Vol. 7; no. 1; pp. 110 - 116
• Main Authors: Karaarslan, Emine Sirin, Mehmet, Bulbul, Ertan, Ertas, Cebe, Mehmet Ata, Usumez, Aslihan
• Format: Journal Article
• Language: English
• Published: A-12, Second Floor, Sector -2, NOIDA -201301, India Thieme Medical and Scientific Publishers Private Ltd 01.01.2013; Dental Investigations Society
• Subjects: Original Article; color change; inlay oven; Composite resin; polymerization methods
• ISSN: 1305-7456; 1305-7464
• DOI: 10.1055/s-0039-1699004

ABSTRACT Objective:To examine the amount of change in color and color parameters of a composite resin (Filtek P60) polymerized by five different polymerization methods. Methods: A Teflon mold (6mm in diameter, 2mm in height) was used to prepare the composite resin discs (n=10). G1: Polymerization with inlay oven; G2: Polymerization with HQTH and autoclave; G3: Polymerization with LED and autoclave; G4: Polymerization with HQTH; G5: Polymerization with LED. Colorimetric values of the specimens before and after polymerization were measured using a spectrophotometer. The CIE L*a*b color system was used for the determination of color difference. Analysis of variance (ANOVA) was used to analyze the data for significant differences. Tukey’s HSD test and paired two-tailed tests were used to perform multiple comparisons (α=.05). Results: There were no significant differences in total color change (ΔE*ab) among the polymerization groups (P>.05). However, the lowest color change (ΔE*ab) value was 3.3 in LED and autoclave; the highest color change (ΔE*ab) value was 4.6 in HQTH. For all groups, CIE L*, C*ab and a*values decreased after polymerization (P<.05). The highest Δb* and ΔC*ab values were observed in specimens polymerized in an inlay oven (P<.05). Conclusion: Composite resin material showed color changes above the clinically accepted value in all study groups (ΔE*ab≥3.3). All specimens became darker during investigation (ΔL*< 0). Specimens polymerized with inlay oven presented the highest Δb* values which means less yellow color in specimens. (Eur J Dent 2013;7:110-116)