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Degree of conversion in denture base materials for varied polymerization techniques
J A Bartoloni1, D F Murchison, D T Wofford
1USAF Dental Investigation Service, Brooks AFB, Lackland AFB, TX, USA. joseph.bartoloni@brooks.af.mil
Journal of Oral Rehabilitation
|July 11, 2000
Summary
New denture resin processing methods were studied for residual monomer content. Rapid boil-out techniques showed slightly lower conversion but are unlikely to cause adverse tissue reactions compared to conventional methods.
Area of Science:
- Materials Science
- Biocompatibility
- Polymer Chemistry
Background:
- New processing techniques for denture base acrylic resins lack comparative data on residual monomer content.
- Elevated residual monomer levels can cause tissue irritation and affect physical properties and biocompatibility.
- Understanding the degree of conversion is crucial for assessing the safety and efficacy of new acrylic resin processing methods.
Purpose of the Study:
- To evaluate and compare the residual monomer content of acrylic resins processed using different polymerization modes.
- To determine the degree of conversion for each processing technique.
- To assess the potential clinical implications of residual monomer content on tissue response.
Main Methods:
- Acrylic resins were processed using three distinct polymerization methods: conventional (Lucitone 199), rapid boil-out (Accelar 20), and microwave (Acron MC).
- Fourier transform infrared spectrometry (FTIR) was utilized to quantify the degree of conversion for each resin sample.
- Statistical analysis (ANOVA) was performed to determine significant differences between the groups.
Main Results:
- All tested curing methods achieved a high degree of conversion (Lucitone 199: 92.7%, Acron MC: 92.6%, Accelar 20: 90.9%).
- The Accelar 20 (rapid boil-out) technique showed a statistically significant, though minor, reduction in conversion compared to conventional and microwave methods (P < 0.05).
- Residual monomer levels were comparable across all techniques, suggesting similar biocompatibility.
Conclusions:
- The rapid boil-out technique for denture base acrylic resins results in a high degree of conversion, comparable to conventional and microwave methods.
- While statistically different, the slight decrease in conversion with the rapid boil-out technique is unlikely to lead to increased adverse tissue responses.
- Current alternative processing techniques appear to maintain acceptable levels of residual monomer, ensuring clinical safety.