Comparative evaluation of various polishing systems on color stability of two nano composite resin restorative materials - an in vitro study

Aim: To compare the effect of four different polishing systems on color stability of two Nano composite resins immersed in four beverages (Coffee, Tea, Cola and Fanta). Methods: Eighty disc shaped specimens of 10 mm diameter and 2 mm thickness were prepared for each of the two Nano composite resins (Tetric N Ceram; Estelite alpha). The specimens of each material were divided into four groups (n=20) and were polished by four different systems (Optrapol; Astro brush; Diamond polishing paste; Shofu super-snap polishing discs). They were then immersed in four different beverages for 10 days at room temperature (Coffee, Tea, Cola and Fanta). The color of the specimens were evaluated under spectrophotometer before and after immersion. The mean color change (ΔE) values were statistically analyzed using three ways ANOVA. Results: The color change (ΔE) of the two Nano-composites ranged between 4.012 and 2.474 after 10 days of immersion in staining solutions. Statistically significant difference (p<0.05) was observed between the staining of two Nano-composites when compared with polishing systems and staining solutions. Conclusions: The two Nano-composites showed comparable color changes in all beverages. Estelite alpha showed greater resistance to staining as compared to Tetric N Ceram. Staining susceptibility was greater when polished by OptraPol followed by Astro brush, Diamond polishing paste and Shofu super-snap polishing discs. Correspondence to: Anitha Rao S, Department of Conservative Dentistry and Endodontics, Mamata Dental College, Giriprasad Nagar, Khammam 507002, Telangana, India; Tel: +91 9866957163; Fax: 08742 255545; E-mail: [email protected]