Influence of repeated load and water immersion on deterioration of composite resin

Abstract

I investigated the influence of water immersion and repeated load on the deterioration of composite resins. Specimens loaded repeatedly for 100,000 times were subjected to long-term immersion in 37℃ or 60℃ water. The sectioned specimens were observed by SEM and their flexural properties were determined. Although repeated loads created superficial cracks and fractures in the microfilled resin, long-term immersion had little effect. Neither repeated loading nor long-term immersion significantly affected the flexural properties, regardless of the type of composite resin. The water temperature had little effect on deterioration of the material.