Oral Health and Dental Management

Abstract

Comparative Evaluation of Push-Out Bond Strength of Bulk-Fill versus Dual-Cure Resin Composites in Root Canals

Aysin Dumani, Sehnaz Yilmaz, Gorkem Ozbilen, Cihan Cem Gurbuz, Oguz Yoldas

Purpose: The aim of this study to evaluate the bond strength of bulk-fill and dual-cure resin composites to root canal dentin at coronal, middle and apical levels. Materials and Methods: Forty four extracted single-rooted teeth were removed 12 mm from the apex and a root canal treatment was performed. The post spaces were prepared to a depth of 8 mm using a Cytec Blanco pilot bur. Then, the roots were randomly divided into four groups according to the restoration protocols: Fiber post + Panavia F, Clearfil DC Bond + Bulkfill composite (SonicFill), Clearfil DC Bond + Bulkfill composite (Clearfil PhotoCore), and Clearfil DC Bond + Dualcure composite (Clearfil DC CorePlus). For the push-out test, the roots were embedded in acrylic and sectioned using a watercooled diamond coated saw. Three slices (coronal, middle, and apical) were obtained from each root. Results: The SonicFill group had the lowest push-out bond strength values, while the Fiber post + Panavia F group had the highest median MPa levels for the coronal, middle, and apical levels (p<0.001). In all groups, the apical third section had a lower push-out bond strength compared with the middle and coronal levels. Conclusion: The bond strength of a sonic activated bulk-fill composite in root canals is lower than that of other conventional methods