The effect of type of cement and different surface treatments on the final color of high translucent monolithic zirconia restorations

Abstract

Objective: In general, surface treatment and the type of cement used, are two very important factors involved in the color of monolithic zirconia restorations. Considering the importance of aesthetics in the restoration of missing teeth, various studies investigated the effect of various factors on the color of the restorations. This study was conducted with the aim of investigating the effect of the type of cement (adhesive resin and self-adhesive) and different surface treatment methods (glazing and polishing) on the final color of high-translucent monolithic zirconia restorations. Methods: In this study, 60 samples of translucent zirconia blocks , which their standards were checked in terms of correct size, absence of bubbles and nodules, correct thickness and diameter of control, and then their surface was treated by polishing and glazing methods. Two types of adhesive resin cement and self-adhesive cement with a thickness of 0.1 mm, controlled by a metal mold with specific diameter and thickness, were placed on the zirconia blocks. To measure the effect of cement type and surface treatment on the final color, a spectrophotometery was used before and after cement. Then transmittance of the samples was calculated. The results were analyzed using appropriate statistical tests. Results: The results showed that there was no significant difference in transmittance between polished and glazed monolithic zirconia restorations (P>0.05). In other words, the type of surface preparation had no effect on the color of monolithic zirconia restoration. Also, in terms of investigating the effect of the type of cement used in the color of the restoration, our results showed that in polished restorations, the type of adhesive or self-adhesive resin cement has no effect on the difference in transmittance and therefore the color of the restoration (P>0.05). But in the glazed type, restorations with adhesive resin cement had a significant difference in transmittance compared to restorations with no cement (P<0.05). Conclusion: Based on the findings of this in vitro study, the type of surface treatment (glazing or polishing) has no effect on the color of monolithic zirconia restoration. Regarding the effect of the type of cement used, the use of adhesive resin cement in glazed restorations caused a change in the color of monolithic zirconia restorations, which indicates the effect of the type of cement used in the restoration on the color.