Evaluatoin of Effect of Surface-Sealing on Composite- Discoloration:(In Vitro Study)

Objectives: Objective: Color stability of tooth colored restoration material is always a noticeable issue in cosmetic dentistry. Discoloration (ΔE) of resin composites is one of the most important reasons of replacement of the restorations in long-term. Consequently many techniques and materials were introduced and applied to overcome this challenge such as; surface repolishing, surface sealing, type of composite, types and power of light cure devices. Surface sealing or glazing of composite restoration is one of the strategies to overcome the surface staining and discoloration of composite materials. The aim of this study was to evaluate the effect of surface sealing on composite discoloration
Methods: Method: composite discs (n=18, 3x11mm, AmelogenA2) were prepared and then divided in to three groups including: control group (C), Polished group (P), Glazed group (G). In C group no treatments were performed on the surface of the composites. In P group the samples were polished with Sof-Lex discs according to manufacture instruction. In G group specimens were first polished exactly similar to the P group, afterward the surface coating (Permaseal) were applied and stored in distilled-water (24 hours).All samples were brushed and stored in natural saliva in order to resemble the oral environment. Samples were exposed to staining solution (Lipton tea) and introduced to spectrophotometer (Coloreye 7000A).One sample of each group were analyzed by Scanning Electronic Microscope (SEM).
Results: Result: ANOVA test revealed that there was no statistically significant difference in discoloration between three tested groups (P≥ 0.05).Mean value of ΔE were in Glazed group 1.7±0.81, Control group 2.03±0.25, polished group 2.4±0.92.
Conclusions: Conclusion: According to the results we achieved in this study it seems that surface sealing had no particular effect on surface staining and discoloration of composites. In addition , discoloration was not clinically noticeable in all three groups (ΔE≤ 3.3).