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Interfacial Fracture Energy Between New Translucent Zirconias and a Resin Cement
The Journal of Adhesive Dentistry
|April 13, 2022
Summary
Thermal aging negatively impacts translucent zirconia and resin cement bonds, reducing interfacial fracture energy (IFE). Failures in the oral environment are likely to occur under tensile stress due to lower energy requirements.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Solid Mechanics
Background:
- Translucent zirconia is increasingly used in dental restorations.
- Understanding the bond strength and failure mechanisms of zirconia bonded to resin cement is crucial for clinical success.
- Brazil-nut-shaped specimens offer a unique geometry for evaluating interfacial properties.
Purpose of the Study:
- To determine the interfacial fracture energy (IFE) of Brazil-nut-shaped specimens made of translucent zirconia and resin cement.
- To analyze the stress distribution within these specimens under various loading conditions.
- To evaluate the effect of thermal aging on the IFE and bonding integrity.
Main Methods:
- Three types of translucent zirconia (3Y-TZP, 4Y-TZP, 5Y-TZP) were bonded with 10-MDP-based resin cement.
- Brazil-nut-shaped specimens with elliptical defects were subjected to thermal aging (5°C-55°C; 40,000 cycles).
- Interfacial fracture energy (IFE) was measured at different interface angles (0-30 degrees) using a piston compression method; Finite Element Analysis (FEA) was employed for stress distribution analysis.
Main Results:
- No significant differences in IFE were found between non-aged and aged materials when analyzed independently (p > 0.05).
- A significant difference was observed between aged and non-aged materials across all inclinations (p < 0.05), indicating negative effects of aging.
- FEA revealed a predominance of tensile stress at 0 degrees and shear stress at 30 degrees under compressive loading.
Conclusions:
- The IFE is higher under predominantly shear stress compared to tensile stress.
- Failures in the oral environment are predicted to occur preferentially under tensile stress due to lower energy requirements.
- All tested translucent zirconia-resin cement interfaces exhibit similar IFE, but thermal aging compromises their bonding integrity.
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