Methods: In this in vitro study, 36 freshly extracted adult human premolars were used. Then specimens were divided into three groups of 12 as follows: normal saline (group 1), chlorhexidine gel 2% (group 2), and triple antibiotic paste (group 3). All specimens were stored for 10 days at 37°C in incubator, and then dentin bonding system was applied to the dentin surfaces. Shear bond strength was measured after 24 h incubation. Then data were analyzed with Kruskal-Wallis Test.
Results: The mean shear bond strength in saline, chlorhexidine, and antibiotic groups were 17.25, 25.75 and 13.93 respectively. There was no significant difference between studied groups (P>0.05).
Conclusions: There were no noticeable changes in shear bond strength of experimental groups. Also, chlorhexidine increased the mean shear bond strength slightly.