Abstract

This study investigated the effects of oxygen inhibition and finishing/polishing procedures on the composite resin properties. One bulk-fill and two conventional composite resins (nanoparticle and microhybrid) were evaluated. Specimens were prepared using 4 surface treatments: control, no treatment; Gly, oxygen inhibition with glycerin; FP, finishing and polishing; Gly + FP, glycerin followed by finishing and polishing. The degree of conversion (DC) was measured using Fourier Transformed Infrared Spectroscopy (FTIR) immediately and after 15 days (n=5). Color stability (ΔEab, and ΔE00) and opacity were evaluated using a spectrophotometer after 15 days of immersion in coffee, using the CIELAB system (n=5). Data were analyzed by two-way ANOVA and Tukey tests (α=0.05) and opacity by two-way repeated-measures ANOVA. Glycerin usage increased significantly the DC however had no influence on the ΔEab, ΔE00 and, opacity values. Finishing and polishing reduced ΔEab and ΔE00 values, regardless of composite resins. Microhybrid showed higher opacity, followed by the nanoparticle and bulk fill, regardless of surface treatment. Post-polymerization polishing procedures resulted in lower conversion than using an oxygen inhibitor agent (Gly condition), but similar staining caused by coffee.

Highlights

  • Composite resins are materials widely used in daily practice that need adequate polymerization for good clinical performance [1]

  • Two-way ANOVA showed that the composite resin (p

  • Two-way ANOVA showed that the composite resin (ΔEab :p

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Summary

Introduction

Composite resins are materials widely used in daily practice that need adequate polymerization for good clinical performance [1]. These materials are undergoing chemical degradation processes in the oral cavity due to diets that contain staining solutions, as well as acidic foods and drinks [2,3]. Degradation of composite resin, including color alteration, may result in additional costs due to early replacement of restorations. The DC depends on the emission spectra of light curing units to match the absorption spectra of the photoinitiators used in these materials. The light must reach all area of the restoration [4]

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