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Effect of different concentrations of chlorhexidine on bond strength of primary dentin

Abstract:

Purpose: The purpose of this study was to assess the effect of different concentrations of chlorhexidine digluconate on the bond strength to primary tooth dentin immediately and after 12 months. Methods: Twenty-one sound primary molars were assigned to 3 groups (n=7). The bonding procedure was performed in control group (A) using 37%phosphoric acid gel (15 seconds), then washed (15 seconds), dried with air (30 seconds), and rehydrated with water. Groups B and C had the rewetting procedure performed, respectively, with 0.5%and 2%chlorhexidine for 30 seconds. The tensile bond strength was tested immediately (iM) or after storage in artificial saliva for 12 months (12M). Data were evaluated by 2-way repeated measures analysis of variance and Tukey's post-hoc test. Results: There was no significant reduction in bond strength values when chlorhexidine was used at concentrations of 0.5%(iM=49.3/2.6 and 12M=32.3/7.9) and 2%(iM=44.0/8.7 and 12M=34.6/5.1). Conversely, a significantreduction in bond strength was observed in the control group (iM=50.8/12.8 and 12M=20.4/3.7). Conclusion: The study validates the concept that chlorhexidinesolution, at different concentrations, may prevent the degradation of the adhesive interface in primary teeth.