Ceren DEĞER, Leyla FAZLIOĞLU, Zümrüt Ceren ÖZDUMAN, Burcu OĞLAKÇI ÖZKOÇ, Evrim ELİGÜZELOĞLU DALKILIÇ
Clinical Dentistry and Research - 2026;50(2):171-178
Background and Aim: Calcium hydroxide liners are commonly used in deep cavities and their mechanical properties may affect the adhesion of restorative materials. This study evaluated the effect of cavity conditioner application on the shear bond strength of glass ionomer-based materials to a calcium hydroxide liner. Materials and Methods: Sixty acrylic blocks containing standardized cylindrical cavities were prepared and filled with a calcium hydroxide liner (Dycal, Dentsply Caulk). The specimens were first divided according to cavity conditioner application (with or without 20% polyacrylic acid) and then subdivided based on the restorative material applied over the liner: a conventional glass ionomer cement (Fuji IX GP Capsule, GC Dental), a resin-modified glass ionomer cement (Fuji II LC Capsule, GC Dental), or a bioactive ionic resin liner (Activa BioActive Liner, Pulpdent) (n=10). Shear bond strength testing and failure mode analysis were performed. Data were analyzed using two-way analysis of variance and Bonferroni post hoc tests ( alpha=0.05). Results: Glass ionomer-based material type significantly affected shear bond strength (p<0.05), whereas cavity conditioner application showed no significant effect (p>0.05). Fuji II LC showed the highest bond strength values (6.48+/-2.67 and 6.81+/-3.50 MPa), whereas Fuji IX GP showed the lowest (3.54+/-1.98 and 4.13+/-1.46 MPa). Activa BioActive Liner showed comparable values (4.99+/-1.84 and 6.39+/-2.34 MPa). Adhesive failures predominated in Fuji IX GP groups, whereas cohesive and mixed failures were more frequent in resin-containing groups. Conclusion: Cavity conditioner application did not significantly improve bond strength to calcium hydroxide. Resin-modified glass ionomer may provide more favorable interfacial performance than conventional GIC, whereas the bioactive ionic resin liner demonstrated comparable performance to both materials.
