Effect of polydopamine surface pre-treatment on pushout bond strength of customised short fiber reinforced post

Aim: To evaluate and compare the effect of silane and polydopamine functionalized surface treatment on the push out bond strength of customised fiber reinforced post system cemented to root dentin.

Methodology: Thirty single rooted premolar teeth were endodontically treated followed by post -space preparation. Fiber reinforced posts systems (EverStick-POST Stick, ESP) were randomly assigned (n=10) for surface treatment with Polydopamine (group 1), silane (group 2) and control (no treatment) (group 3), following which posts were cemented using resin cement. Following 24 hours, each sample was subdivided into four slices (2 mm thick) to determine the push out bond strength in the coronal and middle thirds and expressed in megapascals (MPa). Data was statistically analyzed using Post hoc Tukey HSD and Student t tests using one-way ANOVA (p=0.05). Failure modes were investigated using a stereomicroscope. Surface treated posts from each group were also analysed under SEM.

Results: Polydopamine surface treatment showed significantly higher push out bond strength than silane and control groups in the middle third (p<0.05) with more of mixed type of failures in both the experimental groups. SEM images revealed good homogenization and surface deposition of polydopamine molecules on the post surface.

Conclusion: Polydopamine surface treatment showed positive effect than silane on the adhesion of customised fiber reinforced post to root dentin.