title: Influence of a series of organic and chemical substances on the translucency of resin composites.
abstract: The objective of this study was to investigate the changes in the translucency of resin composites following a series of immersion treatments in organic and chemical substances. Color of resin composites was measured according to the CIELAB color scale relative to the standard illuminant D65 over a white and a black background. Translucency parameter (TP) of resin composites was calculated at baseline, and after sequential immersion: Step 1, porcine liver esterase (a substitute for a salivary esterase); Step 2, organic substances (mucin and serum) and phosphate-buffered saline (PBS) as a control; Step 3, chemical alteration agents [chlorhexidine (CH) and carbamide peroxide (CP)]; and Step 4, 2% methylene blue. Porcine liver esterase caused small changes in TP (DeltaTP = -0.5 to 0.2). After Step 2, DeltaTP values of three groups were similar in the range of -0.7 to 1.2. After Step 3, DeltaTP values of all groups were small in the range of -1.5 to 2.2. After Step 4, DeltaTP values were high and differences that varied by the resin composite and the immersion protocol were clearly observed (DeltaTP = -13.4 to -2.5). Changes in TP were mainly influenced by resin composite. After Step 4, mucin and serum groups showed generally small changes in TP compared to PBS group. It is a possibility that the high changes in TP after immersion in methylene blue is an indication of dye absorption which might be an indication of the degree of resin composite degradation.
authors.affiliation: Department of Dental Biomaterials Science, Dental Research Institute, College of Dentistry, Seoul National University, 28 Yeongeon-dong, Jongro-gu, Seoul, Korea.
authors.forename: Ji-Hyung
authors.initials: JH
authors.lastname: Kim
authors.forename: Yong-Keun
authors.initials: YK
authors.lastname: Lee
authors.forename: John M
authors.initials: JM
authors.lastname: Powers
mesh_terms: D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry / Q000378:metabolism; D001826:Body Fluids / Q000737:chemistry; D003116:Color; D003188:Composite Resins / Q000737:chemistry / Q000378:metabolism; D004950:Esterases / Q000378:metabolism; D008027:Light; D008422:Materials Testing; D013552:Swine
chemical_list: D001672:Biocompatible Materials; D003188:Composite Resins; D004950:Esterases