Effect of proanthocyanidin on push-out bond strength between fiber post and root dentin-An in-vitro study

The aim of this study was to assess the influence of Proanthocyanidin (PA) application on bond strength of glass fiber posts to root canal dentin using self-etch adhesive luting system.

Twenty single rooted mandibular premolars, freshly extracted for orthodontic purpose, were decoronated below the cementoenamel junction, and standardized to 14mm in length. Post space preparation was done upto No 3 Peeso reamer during which canals were irrigated with conventional irrigation protocol. Teeth were randomly divided into two groups (n=20 each) Group 1: Pre-treatment with PA and Group 2 served as the control group. Both Groups were restored with fiber posts bonded with RELYX U200 self-etch adhesive system. Teeth were then stored in distilled water for three months at 37° C. One mm slices were obtained and push-out bond strength testing was performed. Failure patterns were assessed under stereomicroscope at 20x magnification.

Individual bond strength values were calculated and statistically analysed with the chi-square test and independent-ttest. A statistically significant difference existed between the two Groups (p <0.001) with Group 1 showing a mean bond strength value greater than Group 2.

Pretreatment with PA preserves the bond strength of fiber posts to root dentin bonded with a self-etch adhesive system. The results indicate that PA can be used as a biocompatible pretreatment alternative to improve bond strength stability of dentin-adhesive interfaces in root canals.