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Flexural properties of denture base resins subjected to long-term water immersion
Yutaka Takahashi1, Ippei Hamanaka, Hiroshi Shimizu
1Division of Removable Prosthodontics, Fukuoka Dental College, Fukuoka, Japan. ytakaha@college.fdcnet.ac.jp
Objective:
The aim of this study was to investigate the flexural properties of denture base resins subjected to long-term water immersion.
Materials And Methods:
Four denture base resins (one conventional heat-processed, one microwave energy-processed and two pour-type autopolymerizing) were selected for this study. The specimens of each denture base material tested were fabricated according to the manufacturers' instructions (n = 10). The flexural properties of the denture base resins were measured according to ISO 20795-1. The ultimate flexural strength, the flexural strength at the proportional limit and the elastic modulus of the specimens were evaluated.
Results:
The ultimate flexural strengths of the heat-processed resin and the two pour-type autopolymerizing resins significantly decreased after 6 months water immersion. The flexural strength at the proportional limit of the heat-processed resin significantly decreased after 6 months water immersion, but the microwave energy-processed denture base resin and two pour-type autopolymerizing resins did not change after 6 months water immersion. The elastic moduli of the heat-processed resin, the microwave energy-processed denture base resin and one pour-type autopolymerizing resin significantly increased after 6 months water immersion.
Conclusion:
The flexural properties of denture base resins significantly changed after long-term water immersion.
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