Influence of Calcium Silicate-Based Cement-Repaired Root Canals on Push-Out Bond Strength of Glass Fiber Posts: An In...

This study aimed to compare the push-out bond strength of glass fiber posts cemented with self-etch and self-adhesive resin cements in various sizes of perforated roots repaired by calcium silicate-based cement.

Human premolars were divided into six groups based on perforation size (none, 0.8 mm, or 1.4 mm) and type of resin cement: self-etch adhesive (SE) and self-adhesive (SA) (n = 12). Root perforations were created using a cylindrical diamond bur and repaired with calcium silicate-based cement, then stored in distilled water at 37°C for 7 days. Fiber posts were cemented with either SE or SA resin cement. Specimens were embedded in epoxy resin, stored for 24 h at 37°C, then sectioned into 2 ± 0.1 mm slices. Push-out testing was conducted using a universal testing machine at 1 mm/min. Data were analyzed by two-way ANOVA and Tukey's test (p < 0.05). Failure modes were examined under SEM.

Perforation size significantly influenced bond strength. The 1.4 mm group showed lower bond strength (13.07 ± 3.01 MPa) than the 0.8 mm and control groups (16.74 ± 2.63 MPa and 17.13 ± 2.89 MPa; p < 0.05). However, the type of resin cement did not significantly affect bond strength between groups (SE: 15.00 ± 3.63 MPa; SA: 16.23 ± 2.96 MPa; p > 0.05).

Larger root perforations repaired with calcium silicate-based cement result in reduced push-out bond strength of fiber posts. No significant difference in bond strength was found between SE and SA resin cement.