Influence of Different Adhesives on Shear Bond Strength of Zirconia Restorations
Asian Journal of Dental Sciences · pp. 537–543 · Published 17 Oct 2025
10.9734/ajds/2025/v8i1274Abstract
Background: Bonding to zirconia is challenging due to its non-etchable surface. Incorporation of 10-MDP in adhesives has been suggested to improve resin–zirconia adhesion. Aim: To compare the shear bond strength to zirconia using a 5th-generation adhesive, a 7th-generation adhesive and an MDP-containing adhesive. Materials and Methods: Forty-five zirconia specimens were air-abraded and divided into three groups (n=15): Group I – Recreate Bond 5 (5th-generation etch-and-rinse), Group II – Restorite Bond 7G (7th-generation self-etch), and Group III – Renew MDP (MDP-containing adhesive). Composite cones were bonded and specimens were tested for shear bond strength.Data were analyzed with ANOVA and Tukey’s test (p<0.05). Results: Mean bond strengths were: Group I – 14.55 ± 6.99 MPa, Group II – 13.71 ± 5.65 MPa, and Group III – 17.87 ± 5.67 MPa. Renew MDP showed the highest bond strength, significantly greater than Restorite Bond 7G (p<0.05). Conclusion: MDP-containing adhesive achieved superior zirconia bonding compared with non-MDP adhesives, supporting its clinical advantage.
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