In vitro color change of three dental veneering resins in tea, coffee and tamarind extracts

To study the in vitro color changes of three dental resin veneering materialswhen immersed in tea, coffee and tamarind extracts.Materials and Methods: The color changes of heat polymerized tooth colored acrylic resin(Stellondetrey, B, F14, DPI Dental products of India Ltd, Mumbai), auto polymerizedtooth colored acrylic resin (DPI, B, QV5, DPI Dental products of India Ltd, Mumbai) andlight polymerized resin composite (Herculite XRV, Enamel A2, part no. 22860, lot no.910437, Kerr Corporation, West Collins Avenue, Orange, CA, USA) when immersed inwater extracts of tea (Tata Tea Ltd. Bangalore, India), coffee (Tata Coffee Ltd. Coorg, India)and tamarind were evaluated using computer vision systems. The color images wererecorded in R (red), G (green) and B (blue) form and converted into H (hue), S (saturation)and V (value).Results: Significant color change occurred for auto polymerized tooth colored acrylic resinin tamarind extract, for heat polymerized tooth colored acrylic resin in tea extract andfor light polymerized resin composite in coffee extract. Auto polymerized tooth coloredacrylic resin samples showed an overall higher color change. However, for all the materialsamples coffee extract produced more color change.Conclusion: These results suggest that the color stability of the resins is influenced by thepresence of secondary metabolites such as tartaric acid, tannins, caffeine, saponins andphenols in tamarind, tea and coffee extracts.