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Published on: March 16, 2020
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Metal-composite adhesion based on diazonium chemistry.
Yara Oweis1, Omar Alageel2, Paige Kozak1
1Faculty of Dentistry, McGill University, Montreal, QC, Canada.
Summary
A novel diazonium-based adhesive significantly improves the bond strength between dental alloys and composite resins. This breakthrough enhances the durability of dental prostheses and orthodontic appliances.
Area of Science:
- Biomaterials Science
- Dental Materials
- Surface Chemistry
Background:
- Composite resins exhibit poor adhesion to dental alloys, leading to interface failures in prostheses and orthodontic brackets.
- Developing robust chemical bonding is crucial for improving the longevity and performance of dental restorations.
Purpose of the Study:
- To engineer a new adhesive utilizing diazonium chemistry for enhanced chemical bonding between dental alloys and composite resins.
- To address the limitations of current composite-metal interfaces in dental applications.
Main Methods:
- Dental alloys (stainless steel, cobalt chromium) were coated with a diazonium layer to promote composite adhesion.
- Surface analysis was performed using X-ray photoelectron spectroscopy (XPS).
- Tensile and shear bond strengths of the composite-metal interface were measured, including bracket bonding to teeth.
Main Results:
- X-ray photoelectron spectroscopy confirmed successful diazonium coating on treated metal surfaces.
- The diazonium coating significantly increased tensile bond strength by threefold and shear bond strength by fourfold.
- Improved bond strength was observed for composite resin adhesion to treated alloys and for bracket bonding.
Conclusions:
- Diazonium chemistry offers a viable approach for creating effective composite adhesives for dental alloys.
- This adhesive technology promises enhanced durability for dental repairs, cementation, and orthodontic bracket fixation.
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