Abstract:

Abstract:Objective
To detect the changes of color of four commercial heat-curing denture base resins in different solutions for different storage time and  to evaluate the color stabilities of four commercial heat-curing denture base resins.Methods Four commercial heat-curing denture base resin samples of New Century,Meliodent,Nissin and Basis-Hi were made according to the manufacturer’s instructions and immersed in red wine,coke,coffee， and tea.The samples were also immersed in artificial saliva as control group.The values of changes of color(ΔE) of the specimens immersed in the incubator at 37℃ for 1,28 and 84 d were retested.The value of the   ΔE of the specimens was calculated and analyzed statistically.Results Four commercial heat-curing denture base resins were immersed in red wine,coke,coffee， and tea for 1,28,and 84 d,compared with the other solutions,the values of ΔE of the Meliodent resin materials immersed in red wine was  increased most significantly （P<0.05）.The values of ΔE of the Meliodent and New Century resin materials immersed in red wine were over 3.7,which was regarded as clinically unacceptable.The values of ΔE of the Nissin resin materials immersed in coke,coffee,and tea for 1,28 and 84 d changed  little and there were no significant differences（P>0.05）.Conclusion The color stability of dental base resin materials is associated with  the denture base resins,soak solution,and storage time，and the stability of the Nissin resin materials is the best.

Key words: denture base resin, color stability, soak solution, storage time, chromatism