effects of chitosan on micro-shear bond strength of self-adhesive cements

Background: the long-term success of bonding of self-adhesive cement to the tooth is questionable. different conditioning methods were suggested to improve the bonding durability of these cements. this study aimed to investigate the effect of 1% chitosan solution on micro-shear bond strength of self-adhesive resin cements to dentin.methods: 28 human sound premolar teeth were divided into 4 groups. the occlusal surfaces of the teeth were ground to expose the dentine surface. in control groups, bf (bifix) and eb (embrace) dual-cure self-adhesive cements were applied to the dentin surface using a microtube and were light cured. in the eb+ch and bf+ch test groups, dentin surfaces were conditioned with 1% chitosan solution before using resin cements. the specimens were thermocycled for 2000 times between 5-55°c and their bond strength was measured by a mechanical testing machine at strain rate of 0.5 mm. failure modes were determined using a stereo-microscope at 40x magnification. data were analyzed using two-way anova and tukey's tests (α=0.05).results: the results have revealed maximum bond strength in the eb+ch test group (13.73±0.42 mpa) and the minimum strength in the bf control group (8.01±0.42 mpa). data analysis showed the maximum bond strength in groups where dentin had been pretreated with chitosan solution (p<0.001). the failure mode was mainly adhesive type in all groups.conclusion: dentin surface treated with 1% chitosan solution prior to application of self-adhesive cements increases the cement-dentin bond strength.