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Comparative Evaluation of Shear Bond Strength Between Monolithic Zirconia and Three Different Core Build-Up Materials
Ayben Şentürk1, Bora Akat1, Fehmi Gönüldaş1
1Faculty of Dentistry, Prosthetic Dentistry, Ankara University, 06500 Ankara, Turkey.
Journal of Functional Biomaterials
|September 26, 2025
Summary
Nanohybrid composite resin demonstrated superior shear bond strength to monolithic zirconia compared to glass ionomer cements. This finding highlights optimal core build-up material selection for dental restorations.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Monolithic zirconia (MZ) restorations are increasingly popular due to their strength and aesthetics.
- Effective bonding of core build-up materials to MZ is crucial for long-term restoration success.
- Evaluating different core materials' shear bond strength (SBS) to MZ is essential for clinical application.
Purpose of the Study:
- To compare the shear bond strength (SBS) of nanohybrid composite resin (NHCR), glass ionomer cement (GIC), and zirconia-reinforced glass ionomer cement (Zirconomer) to monolithic zirconia (MZ).
- To analyze failure modes associated with each core build-up material bonded to MZ.
Main Methods:
- Sixty monolithic zirconia specimens were prepared and divided into three groups (n=20) based on core material: NHCR, GIC, and Zirconomer.
- Specimens underwent airborne-particle abrasion and bonding with self-adhesive dual-cure resin cement.
- Shear bond strength testing was conducted after 24-hour water storage at 37°C, with failure modes analyzed microscopically.
Main Results:
- The nanohybrid composite resin (NHCR) group exhibited the highest mean SBS (48.32 ± 12.49 MPa), significantly higher than Zirconomer (14.19 ± 3.66 MPa) and GIC (10.37 ± 4.21 MPa) (p < 0.001).
- Zirconomer showed higher mean bond strength than GIC, though the difference was not statistically significant.
- Adhesive, cohesive, and mixed failure modes were observed and classified.
Conclusions:
- Nanohybrid composite resin demonstrates superior shear bond strength to monolithic zirconia compared to conventional glass ionomer cement and zirconia-reinforced glass ionomer cement.
- Zirconomer offers improved performance over GIC but does not match the bond strength of NHCR to monolithic zirconia.
- Further research on surface treatments and long-term clinical performance is recommended to optimize bonding efficacy for core build-up materials on monolithic zirconia.
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