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Repair strength of denture base resins using various methods
G L Polyzois1, R W Handley, G D Stafford
1Department of Restorative Dentistry, University of Wales College of Medicine, Dental School, Cardiff, UK.
Summary
Microwave-cured denture base resins show superior repair strength compared to conventional water bath or autopolymerized resins. This study measured repair strength using bend and impact tests for enhanced denture durability.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
Background:
- Denture base resins are susceptible to fracture, necessitating effective repair methods.
- Current repair techniques involve heat-activated or autopolymerizing resins, with varying mechanical properties.
Purpose of the Study:
- To evaluate and compare the repair strength of denture base resins using different polymerization methods.
- To assess the efficacy of microwave-activated polymerization versus conventional water bath and autopolymerization for denture repairs.
Main Methods:
- Three types of denture base resins were tested: standard heat-activated, microwave-activated, and autopolymerizing.
- Repairs were performed using conventional flasking for heat-activated resins and open gypsum molds for autopolymerizing resin.
- Transverse bend and impact tests were employed to measure the mechanical strength of the repaired specimens.
Main Results:
- Resin specimens repaired using microwave irradiation demonstrated generally superior transverse strength.
- Impact resistance was also significantly higher in specimens repaired with microwave-activated resins.
- Both microwave-cured resins outperformed those repaired with water bath curing or autopolymerizing resin.
Conclusions:
- Microwave-activated polymerization offers a more robust method for repairing denture base resins.
- This technique enhances both the transverse strength and impact resistance of repaired dentures.
- The findings suggest microwave curing as a preferred method for improved denture repair outcomes.