Objective: The present study was conducted to evaluate effects of adding silver nanoparticles with 0.5% nanoparticles on the bonding of adhesive system to cement glass fiber posts.
Materials and methods: Twenty human maxillary canines were selected, the coronal portion was sectioned and teeth were endodontically instrumented and obturated with gutta percha. Gutta percha was removed using Largo drills, and then root canal walls of each sample were enlarged with the low-speed burs provided by the manufacturers. The depth of the post space preparation was 10 mm, measured from the cementoenamel junction. The samples were randomly divided into two groups according to adhesive system used. Group A: Adhesive system without additives and Group B: Adhesive system containing 0.5%nanoparticles of silver (NAg). Clearfil SE bond applied without and with additives of (NAg) then cured for 20 seconds using light emitting diodes. RelyX ARC resin cement was introduced into canal and posts were positioned and light-cured for
40 seconds then tensile test was done and recorded values of bond strengths in (MPa) were collected, tabulated and statistically analyzed. One way analysis of variance (ANOVA) and Tukey's tests were used for testing the significance between the means of tested groups which are statistically significant when the P value ≤ 0.05.
Results: Tensile strength of adhesive system containing (NAg) (group B) [11.42MPa] had a statistically higher value than adhesive system without (NAg) (group A) [7.99MPa].
Conclusions: The results indicate that (NAg) with concentration 0.5% increase tensile bond strength of the adhesive system.