Abstract
Background: Composite – luted ceramic inlays were one of the top choices for restorations of anterior and posterior teeth because of high aesthetic, good marginal adaptation and controllable anatomy and lateral contact. If the luting composite was exposed to air condition during polymerization, the presence of oxygen would interfere with polymerization of the adhesive surface layer, adversely affecting the prognosis of restorations. Therefore, it is very essential to evaluate different margin - treating techniques to prevent the formation of an oxygen - inhibited layer during the polymerization of composite resin materials. Objectives: The aim of this study was to examine the effectiveness of glycerine and Mylar strip on the marginal adaptation of composite - luted inlays. Methods: Thirty class II cavities were prepared on extracted human permanent premolars, randomly divided into three groups: group 1: e.max Press indirect inlays luted by Variolink II were polymerized in air; group 2: inlays were polymerized after applying glycerine on the restoration margins; group 3: inlays were covered by Mylar strip before light polymerization. To remove the oxygen - inhibited layer, the inlays were brushed with acetone. The clinical evaluation and computerized quantitative marginal analysis under digital microscope were carried out before and after applying acetone. Results: Statistical analysis revealed significant difference between the polymerization with and without the use of glycerine gel, specifically, the inlay margins of group 2 showed better marginal adaptation than group 1 did (p < 0.001). Meanwhile, there was no statistical difference between group 2 and 3 in marginal quality of restorations. Conclusions: Oxygen-initated inhibition during polymerization can be prevented by the application of glycerine gel and Mylar strip to the surface of composite resin materials Key words: IPS e.max Press inlay, class II restoration, marginal adaptation, glycerine gel, Mylar strip.
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