Microhardness evaluation of root dentin after the use of resin sealer solvents

Abstract

Background: This study aimed to assess the effects of methyl ethyl ketone (MEK) and ethyl acetate (EA) on dentin microhardness when used as resin sealer solvents. Methods: Eighty halves of single-rooted teeth were divided into four groups for the application of MEK, EA, chloroform, or saline. Vickers hardness values were measured for three root levels before and after the direct application of solvents for 5 and 15 minutes or for a 1-minute application with ultrasonic agitation. The results were analyzed using repeated measures analysis of variance (ANOVA) and adjustments were made for comparisons with Bonferroni tests. Results: The dentin microhardness decreased in all solvent groups (P < 0.05). The changes in microhardness increased with prolonged exposure times, except for the saline group. Chloroform had the greatest decrease in value. Furthermore, ultrasonic agitation elicited a greater decline in values. Conclusion: The use of MEK and EA may be preferred over chloroform as a solvent for resin sealers because they offer an attenuated decrease in dentin microhardness and do not have gutta‑percha–dissolving properties.