Evaluation of the effect of remineralization with strontium-doped nanohydroxyapatite with noncollagenous protein analog: Chitosan on the shear bond strength of resin composite to dentin – An in vitro study

CONTEXT: The resin–dentin interface is less durable, which reduces the longevity of tooth-colored restorations. To encounter this shortcoming, the use of nanotechnology to mimic biomineralization proves beneficial. AIMS: This study was conducted to evaluate the effect of remineralization with strontium-doped nanohydroxyapatite (Sr-nHAp) with chitosan on shear bond strength of resin composite to dentin. MATERIALS AND METHODS: Sixty five extracted human premolars were divided into five groups (n = 13) based on remineralization protocol as: Group A – 20% (Sr-nHAp) with chitosan, Group B – 10% (Sr-nHAp) with chitosan, Group C – 20% (Sr-nHAp) with simulated body fluid, Group D – 10% (Sr-nHAp) with simulated body fluid, and Group E – control. Following bonding, resin composite of specified dimension was built and was subjected to shear bond strength test after 24 h and 1 week using Universal Testing Machine, and mode of failure was assessed. ANOVA and paired sample t-test were used for analyzing the data, and the level of significance was set at 5%. RESULTS: The highest value of shear bond strength was obtained from Group A after aging for a week, and there is a significant increase in the value of all the groups as compared to the control group after 1 week of storage than 24 h. CONCLUSIONS: Remineralization with Sr-nHAp and chitosan has positively improved the bond strength of resin to dentin at the end of 1 week.