Effect of cigarette smoke on color stability of dental composites using spectrophotometer -an in vitro study.

Abstract

Aim: To assess three dental composites color stability after they are exposed to brushing and cigarette smoke using spectrophotometer.
Materials and Methods: Twenty specimens were prepared for each type of restorative material used: nanohybrid (Tetric N-Ceram); hybrid (Z250-3M ESPE) and silorane-based microhybrid (Filtek P90-3M ESPE), which were divided into 2 groups (n = 10), according tothe type of finishing/polishing received: Group 1 – papers with decreasing abrasive grit and Group 
2 – polyester matrix (without polishing). After initial readouts of color (Easy Shade-VITA) specimens were subjected to action of smoke from 20 cigarettes, (Marlboro Red–Philip Morris). After each cigarette, the samples were submitted to brushing in a standardised device. After this, final readouts were taken to calculate change in color