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허정무,강동현,김명섭,오상엽,장광수,이용근 원광대학교 생체재료·매식연구소 1995 원광생체재료·매식 Vol.4 No.2
Under oral conditions, restorations are exposed to the combined effect of light, oral fluid, extrinsic stain and mechanical wear, which can cause esthetically undesirable color changes. Discoloration of dental appliances may pose a considerable cosmetic problem to many patients. Denture and orthodontic appliances are used considerably long time in the mouth, and the degree of discoloration will be different depending on the oral cavity conditions, foods consumed and storage condition. The purpose of this study was to evaluate the color stability of dental acrylic resins after immersion in various solutions using color difference meter(CIEL.AB color scale). Five kinds of acrylic resins, two(VRS, PS2) were heat cured denture base resin, one(VSC) was chemically cured denture base resin and the other two (ORJ, VOP) were orthodontic resins. The acrylic resin specimens of thickness 3 mm were made according to the manufacturer's instructions and were final polished with Microcloth(Buehler). The specimens were immersed in five kinds of solutions, normal saline(SAL), Polident solution(PDT), cola(COL), beer(BER) and vinegar solution(VNG) for four weeks. Every one week, after removal from each solutions, L, a, b and ΔE value of specimens were measured using Colorimeter (Model TC-6FX, Tokyo Denshoku Co.). In the denture base acrylic resin, the color change (ΔE) was great in the PDT and BER solution after four weeks immersion, and the amount of change was most prominent during the second one week. In the orthodontic resin, greater color change was recorded compared to denture base resin. And th color change (ΔE) was great in the BER, COL, VNG, PDT and SAL in the decreasing order after four weeks immersion, and the amount of change was most prominent during the second one week immersion. The 'L' value showed decreasing tendency during immersion. And 'a' and 'b' value was changed according to the color of immersion solutions. Results suggest that the dental acrylic resins generally became darker and absorbed extrinsic pigments during immersion in solutions, and the amount and direction of discoloration was different depending on the solution type and duration.