Clinical Evaluation of In-Office Tooth Bleaching Effects on Three Contemporary Composite Resins

Materials and methods: A total of 30 restorations (twelve subjects), 18-38 year olds with class IV carious upper anterior teeth were included, divided into three groups. Each group (n=10 restorations) was randomly restored with the same restoration material type; Beautifil II nano hybrid composite resin (Shofu Dental Corporation, USA), IPS Empress Direct nano hybrid composite resin (Ivoclar Vivadent, USA), and the nano ceramic micro hybrid composite resin Ceram-x-mono (DeTrey, Dentsply, Germany). They were restored according to the manufacturers’ instructions. A clinical evaluation was conducted before bleaching (baseline) and two days, 3 months, 6 months, and one year after bleaching for modified Ryge criteria. The A and B scores were considered clinically acceptable while C and D scores were considered clinically unacceptable. The data were subjected to statistical analysis using Chi-squared test (Х2) and ANOVA.