Comparative evaluation of the effect of three medications on the color stability of two commercially available acrylic resin denture teeth after thermocycling – An in vitro study

Introduction: The purpose of this study is to estimate the color stability of two commercially available acrylic resin teeth and the effect of three types of medications after thermocycling, by spectrophotometric analysis. Aim: The aim of this study is to evaluate the effect of three types of medications – iron syrup, cough syrup, and digestive syrup on the color stability of two commercially available acrylic resin denture teeth after thermocycling. Materials and Methods: Total 160 samples were divided into two main groups. The samples were first thermocycled and randomly divided into subgroups according to the respective brands and were subjected to baseline spectrophotometric measurement and then immersed in respective medication solutions. After 4 weeks, color measurements were recorded for all samples. Color differences were determined by ΔE* and National Bureau of Standards units (NBS units). Results: After ΔE evaluation, control groups had values A1 (0.509) and B1 (0.498). Color differences with ΔE values above 3.7 were observed in all the test subgroups. When the National Bureau of Standards (NBS) values were evaluated, iron syrup was observed to cause “much” change in both the subgroups A2 (7.835) and B2 (7.843), but more color change was observed in B2. Conclusion: Acry Rock denture teeth were more color stable than Rolex in three medications. Most chromogenic staining medication was found to be iron syrup, which caused “much” color changes, followed by digestive syrup. Moreover, the least staining medication was cough syrup, which caused “appreciable” color changes according to the NBS critical remarks of color differences.