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Primer for bonding resin to metal
1Department of Fixed Prosthodontics, School of Dentistry, Nagasaki University, Japan.
Summary
This study found that combining thiophosphoric and phosphoric methacrylates with benzoyl peroxide significantly enhances resin bond strength and durability to dental noble metals, achieving results comparable to base metals.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesive Dentistry
Background:
- Dental restorations require durable bonds between resins and metal alloys.
- Current primers may not provide sufficient long-term stability for resin-metal bonds.
- Optimizing primer composition is crucial for improving restoration longevity.
Purpose of the Study:
- To evaluate the impact of modified primers on resin-to-metal bond strength and durability.
- To investigate the efficacy of thiophosphoric methacrylate, phosphoric methacrylates, and benzoyl peroxide in primer formulations.
Main Methods:
- Acrylic rods were bonded to various dental alloys (Ag-Pd, Au-Ag, Co-Cr, Ti) using modified primers and a luting resin.
- Bonded samples underwent 2,000 thermocycles to simulate aging.
- Mean bond strengths were statistically analyzed using ANOVA and Duncan's test.
Main Results:
- Primers with thiophosphoric methacrylate or phosphoric methacrylates alone showed decreased bond strength after thermocycling.
- Combining thiophosphoric methacrylate with phosphate monomers significantly improved durability.
- Adding benzoyl peroxide and heat treatment further enhanced durability, with bond strengths exceeding 20 MPa and remaining stable.
Conclusions:
- A primer mixture of thiophosphoric and phosphoric methacrylates with benzoyl peroxide yields the highest bond strength and durability to noble dental metals.
- These enhanced bond strengths are comparable to those achieved with base metals.
- This optimized primer formulation offers a promising solution for durable resin-metal dental restorations.