Comparative Assessment of Adhesive Bond Strength of 25% and 50% Propolis-modified Glass Ionomer Cement to Human Dentin: An In Vitro Study

Purpose: Comparative assessment of the adhesive bond strength of conventional glass ionomer cement (GIC), 25% propolis-modified GIC and 50% propolis-modified GIC to human dentin. Materials and methods: Forty-five human permanent molars were embedded in acrylic resin block. GIC was modified with 25% ethanol-soluble liquid propolis (ESLP) solution and 50% ESLP to prepare 25% propolis-modified GIC and 50% propolis-modified GIC, respectively. The enamel was removed to expose the dentin followed by conditioning of the dentin surfaces. The samples were randomly divided into three groups: conventional GIC (group A), 25% propolis-modified GIC (group B), and 50% propolis-modified GIC (group C). Standardized-size molds were applied to the exposed dentin, and the GIC was bonded within these molds to form GIC cylinders. Shear bond strength was evaluated after incubation and thermocycling to simulate the oral environment using a universal testing machine. The statistical analysis was performed using one-way analysis of variance (ANOVA) and <i>post hoc</i> Tukey’s test. Results: There was significant difference (<i>p</i> = 0.001) in adhesive bond strength among different groups. The highest mean adhesive bond strength (2.287 ± 0.372 MPa) was noticed in group B (25% propolis-modified GIC), followed by group A (conventional GIC 2.200 ± 0.853 MPa), and then group C (50% propolis-modified GIC 2.200 ± 0.853 MPa. There was statistically significant difference between conventional GIC and 25% propolis-modified GIC (<i>p</i> = 0.002) and 25% propolis-modified GIC and 50% propolis-modified GIC groups (<i>p</i> = 0.001). Conclusion: 25% propolis-modified GIC showed the most significant improvement in bond strength of conventional GIC. 50% propolis-modified GIC showed a deleterious effect. The 25% propolis-modified GIC seems to have the potential to improve clinical performance of restoration. How to cite this article: Madhamshetty N, Punia SK, Bhargava R, <i>et al.</i> Comparative Assessment of Adhesive Bond Strength of 25% and 50% Propolis-modified Glass Ionomer Cement to Human Dentin: An <i>In Vitro</i> Study. Int J Prosthodont Restor Dent 2024;14(3):140–145.