The effects of antioxidant application and time factor on fiber post bonding to root dentin after intracoronal bleaching

Abstract

Aim: The aim was to evaluate the effects of antioxidant application and delayed cementation on the bond strength of fiber posts after intracoronal bleaching.Methodology: Fifty-five maxillary central incisors were used. Root canals were enlarged using Reciproc system up to R40 instrument. Root canals were irrigated, dried with paper-points, and obturated with gutta-percha and a sealer. In 44 teeth, root canal fillings were removed 2-mm coronally and canal orifices were sealed with glass-ionomer-cement. A 37% carbamide peroxide (CP) gel was used to bleach the teeth. Five experimental groups were defined (n=11). G1: No bleaching, G2: Immediate fiber post cementation (FPC), G3: Immediate FPC after sodium ascorbate (SA) application, G4: 14-days delayed FPC, G5: 14-days delayed FPC after SA application. Push-out tests were performed. Statistical interpretations were made (α=0.05).Results: There was no significant difference among the groups in apical thirds (p>0.05). However, significant differences were detected among the groups in middle and coronal thirds (p