The effect of crude Khat extract on the color stability of a Nano-composite resin material: an in vitro study

Abstract

Background: The use of resin composite for restoring teeth has been increased greatly in recent years. Manufacturers are claiming that the nanofilled composite technology has been improved to be similar to the ceramics in shade selection and color stability. In Yemen, khat (Catha) chewing habits may affect the color of esthetic restoration, and it is always accompanied by drinking water and cola. Aim: The aim of this study is to evaluate the effect of crude khat extract on color stability of Nano-composite compared to microhybrid composite resin. Materials and Methods: A total of fifty-four specimens were prepared from each of the composite resin material in the form of circular discs. The prepared specimens were representing the two main groups (I and II), these were subdivided randomly into six equal sub-groups (a-f). Staining solutions were (crude khat extract, cola-mineral water and artificial saliva as a control group). The specimens were immersed in the corresponding staining solutions for four hours daily and kept in an incubator at 37�C for a total of 180 hours. The solutions were changed every 24 hours. Colorimeter was used for color change testing, then collected data was analyzed using SPSS version 20. Results: Microhybrid composite resin showed higher degree of discoloration than nanofilled composite resin. Conclusion: Khat and drinking solutions were significant factors that affected the color stability of composite restorative materials, nanofilled composite showed the least color change.