Bioceramic dressing and its influence on intratubular penetration and bond strength of endodontic sealers

This study aimed to evaluate the influence of bioceramic root canal dressing (BRCD) BIO-C TEMP (BT) on intratubular penetrability through confocal laser scanning microscopy (CLSM) and bond strength (push out) of epoxy resin AH Plus (AH) and bioceramic Bio-C (BC) sealers and evaluate the dentin surface after removing the intracanal medication by scanning electron microscopy (SEM).

After biomechanical preparation, 48 bovine incisors were filled and evaluated for bond strength and intratubular penetrability. The groups were established by the type of sealer used: AH (n=24) or BC (n=24) and no use (0BT) (n=8) or use of root canal dressing for two different experimental times, 7 (7BT) (n=8) and 30 (30BT) (n=8) days. For SEM evaluation, five unfilled teeth were used: without BT (n=1), BT for 7 (n=2) and 30 (n=2) days. Kruskal-Wallis and T-tests were performed for bond strength analysis. Descriptive analysis was used in CLSM and SEM evaluations.

BT decreased the bond strength of AH and BC sealers in both experimental times (7 and 30 days) (P< 0.05). The intratubular penetration with AP was higher than that with BC. SEM showed remnants of BT on the dentin surface in both groups (7 and 30 days). The AH Plus sealer showed more evident intratubular penetration than the Bio-C sealer.

It is not possible to remove a BRCD completely from the root canal. A bioceramic root canal dressing Bio-C Temp decreased the bond strength of both tested sealers, epoxy resin AH Plus and bioceramic Bio-C Sealer. Key words:Root canal dressing, bioceramic, scanning electron microscopy, laser scanning confocal microscopy, sealer.