WORLD JOURNAL OF ADVANCE
HEALTHCARE RESEARCH

Jannah Mahdi Mohammed*, Maha Anwar Agha

ABSTRACT

Background: Zirconia posts are widely used due to their strength, biocompatibility, and esthetics, but their inert polycrystalline surface complicates bonding. Selecting an appropriate luting agent is therefore essential. Aim: This study compared the push-out bond strength of zirconia posts cemented with bulk-fill resin composite (BF), resin-modified glass ionomer cement (RMGIC), and self-adhesive resin cement (SARC) across cervical, middle, and apical root regions. Materials and Methods: Thirty extracted single-rooted premolars were endodontically treated, decoronated, and prepared for zirconia post placement. Specimens were divided into three groups (n = 10) according to the luting agent used. Following cementation, roots were sectioned into 2-mm slices and subjected to push-out testing with a universal testing machine. Data were analyzed using two-way ANOVA and Tukey’s post hoc test (α = 0.05). Results: Bond strength was significantly influenced by both luting agent and root region (p < 0.05). BF achieved the highest values (cervical: 27.67 ± 1.20 MPa; middle: 20.78 ± 1.20 MPa; apical: 13.83 ± 1.20 MPa), followed by RMGIC, while SARC consistently showed the lowest performance (apical: 12.66 ± 1.20 MPa). Cervical regions outperformed middle and apical thirds (p < 0.001). Failure analysis indicated predominantly cohesive failures with BF (67%) and adhesive failures with SARC (50%). Conclusion: Bulk-fill resin composites provide superior retention for zirconia posts compared with RMGIC and SARC, with cervical dentin offering the most favorable bonding substrate. Clinically, BF cements appear to be the most reliable choice, while SARC should be avoided.