Objectives:The surface of a hybrid composite resin material restoration can be finished using a variety of techniques. The effect of finishing on the staining of restorations during long-term use has not been completely clarified. The purpose of this study was to investigate the effect of different polishing methods on the color stability of composite resin materials upon exposure to a staining agent.
Material and methods:
The six different hybrid composite resin material (Pearleste,Estenia,Gradia,GradiaForte,Sinfony and Cermage)were tested. 32 square specimens (20x20x2 mm) of each material were prepared. They were further divided into 4 groups of 8 specimens each for the different surface polishing procedures. They were polished with either 1500-grit silicon carbide abrasive paper,5000,4000 grid silicone diamond polishing burs or a silicone polishing bur. They were stored in 7.4wt% of coffee solution for 1week, 3weeks, 5weeks at 37°C. Color changes were recorded with a colorimeter (TC-1800Mk2; Tokyo dennsyoku).
| Material | #5000 | #4000 | Si | #1500 |
| Pearleste(Tokuyama Dental) | 4.5±0.3 | 4.9±0.5 | 5.0±0.4 | 5.3±0.7 |
| Estenia C&B(Kuraray Medical) | 5.8±0.4 | 6.7±0.9 | 6.0±1.1 | 8.2±0.8 |
| Gradia(GC) | 5.1±0.5 | 7.8±0.3 | 7.3±0.3 | 8.0±0.7 |
| Gradiaforte(GC) | 4.1±0.7 | 5.1±0.7 | 5.8±0.8 | 8.1±1.0 |
| Sinfony(3M ESPE) | 5.8±0.6 | 7.7±1.0 | 7.6±0.5 | 9.3±0.6 |
| Cermage(Shofu) | 6.8±0.6 | 7.6±1.8 | 6.9±1.3 | 9.2±0.7 |
Conclusions:
.When polished with 1500-grit silicon carbide abrasive paper, Pearleste demonstrated a significantly lower color difference than the other hybrid composite materials tested. (P< 0.05) Other hybrid composite resins polished with 1500-grit silicon carbide abrasive paper demonstrated significantly higher color differences than the other polishing groups.