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Warm Air Delivery in Adhesive Application: Effect on Bonding Performance and Morphological Outcomes
Rim Bourgi1,2, Naji Kharouf2,3, Carlos Enrique Cuevas-Suárez4
1Department of Restorative Dentistry, School of Dentistry, Saint-Joseph University, Beirut 1107 2180, Lebanon.
Biomimetics (Basel, Switzerland)
|April 26, 2024
Summary
Warmer air temperatures (40°C and 60°C) significantly improve dental adhesive performance by enhancing solvent evaporation. This leads to better bond strength and longevity of dental restorations, offering a practical optimization for dentists.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials Engineering
Background:
- Solvent evaporation is critical for dental adhesive performance.
- Optimizing this step can enhance bond strength and restoration longevity.
- Current methods lack specific temperature optimization for evaporation.
Purpose of the Study:
- To evaluate the impact of different air-drying temperatures on the performance of four universal adhesive systems.
- To determine if elevated temperatures (40°C, 60°C) improve micro-tensile bond strength (μTBS) compared to ambient temperature (20°C).
- To assess secondary outcomes including failure modes and adhesive layer characteristics.
Main Methods:
- Sixty human molars were prepared for μTBS testing with four adhesive systems (PBU, OBU, OBFL, CSE).
- Solvent evaporation was conducted using cold (20°C), warm (40°C), or hot (60°C) air for 10 seconds.
- Bonded samples were aged for 24 hours and 6 months before μTBS testing; failure analysis and SEM were performed.
Main Results:
- No significant difference in bond strength was observed among adhesive systems or with aging.
- Air-drying temperature significantly impacted bond strength (p < 0.05), with 60°C yielding the highest values.
- Warmer temperatures (40°C, 60°C) increased mass loss, suggesting more complete solvent evaporation and improved adhesive layer quality.
Conclusions:
- Elevated air temperatures (40°C and 60°C) during solvent evaporation positively influence dental adhesive performance.
- Optimizing solvent evaporation with warmer air enhances micro-tensile bond strength and the quality of the adhesive-dentin interface.
- This provides a simple, effective method to improve the durability of dental restorations.
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