Effect of a Desensitizing Agent on Microshear Bond Strength of Two Bonding Systems

Background and Aim: Postoperative tooth hypersensitivity after restorative procedures is a common finding.Considering the obstruction of dentinal tubules following the use of dentin desensitizers, there are some concerns about the effects of desensitizers on the bond strength of bonding systems.This study aimed to assess the effect of a desensitizer on microshear bond strength (SBS) of two bonding systems. Materials and Methods:In this in vitro study, 20 sound human molars were mesiodistally sectioned into halves, and the roots were cut at the cementoenamel junction.The samples (n=40) were then randomly divided into four groups (n=10): (I) Adper Single Bond 2, (II) Desensibilize desensitizing agent+ Adper Single Bond 2, (III) Single Bond Universal, and (IV) Desensibilize desensitizing agent + Single Bond Universal.Adhesives and desensitizing agents were applied according to the manufacturers' instructions.Filtek Z250 composite cylinders were fabricated and bonded to dentin surfaces.The SBS of each sample was then measured.Data were analyzed by one-way ANOVA and a post-hoc test (P<0.05).Results: A reduction in SBS was found following the application of desensitizing agent in combination with Adper TM Single Bond 2 (P<0.05).The SBS increased when the desensitizing agent was applied in combination with Single Bond Universal.However, this difference was not significant (P0.05).Conclusion: Desensibilize desensitizing agent affected the dentinal tubule obstruction and decreased the SBS when used with Adper TM Single Bond 2 total-etch system, while the SBS increased when it was used with Single Bond Universal adhesive.