Division of Removable Prosthodontics, Fukuoka Dental College, Fukuoka, Japan.
Acta Odontol Scand. 2013 May-Jul;71(3-4):716-20. doi: 10.3109/00016357.2012.715196. Epub 2012 Aug 20.
The aim of this study was to investigate the flexural properties of denture base resins subjected to long-term water immersion.
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.
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.
The flexural properties of denture base resins significantly changed after long-term water immersion.
本研究旨在探讨长期浸水对义齿基托树脂弯曲性能的影响。
本研究选择了四种义齿基托树脂（一种传统热固化型、一种微波固化型和两种注压型自凝树脂）。根据制造商的说明制作了每种义齿基托材料的试件（n=10）。根据 ISO 20795-1 标准测量义齿基托树脂的弯曲性能。评估试件的极限弯曲强度、比例极限弯曲强度和弹性模量。
热固化型树脂和两种注压型自凝树脂的极限弯曲强度在 6 个月水浸后显著降低。热固化型树脂的比例极限弯曲强度在 6 个月水浸后显著降低，但微波固化型义齿基托树脂和两种注压型自凝树脂在 6 个月水浸后没有变化。热固化型树脂、微波固化型义齿基托树脂和一种注压型自凝树脂的弹性模量在 6 个月水浸后显著增加。
义齿基托树脂的弯曲性能在长期水浸后发生显著变化。
