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Acrylic denture distortion following double processing with microwaves or heat
E al-Hanbali1, J P Kelleway, J A Howlett
1Department of Prosthetic Dentistry, University of London, UK.
Journal of Dentistry
|June 1, 1991
Summary
Microwave curing significantly reduced acrylic resin denture base distortion compared to conventional water-bath methods. This optimization is crucial for improving the fit and longevity of dental prosthetics.
Area of Science:
- Dental Materials Science
- Prosthodontics
Background:
- Acrylic resin denture bases are susceptible to distortion during curing cycles.
- Optimizing curing methods is essential for achieving accurate fit and patient comfort.
Purpose of the Study:
- To compare the dimensional accuracy of acrylic resin bases cured using water-bath and microwave methods.
- To evaluate the impact of two curing cycles on denture base fit.
Main Methods:
- Acrylic resin bases (conventional and chemically activated) were fabricated and subjected to two curing cycles.
- Curing methods included long water-bath, short water-bath, and microwave irradiation.
- Denture base fit was assessed by measuring distortion using silicone indices and cross-sectional analysis.
Main Results:
- All curing methods showed significant distortion between the first and second curing cycles (P < 0.001).
- Microwave curing resulted in significantly less distortion than short water-bath curing (P < 0.001).
- The center of the palate showed the most significant difference in distortion reduction with microwave curing.
Conclusions:
- Microwave curing offers a superior method for reducing dimensional distortion in acrylic resin denture bases.
- Optimized curing protocols, particularly microwave, can enhance the fit and potentially the clinical performance of dentures.