In this study, we investigated compressive strength of various luting cements and composite resin cores in both dry and wet condition, and then influences of repeating load on compressive strength in wet condition of distilled water at 37.
As frequency of repeating load increased, compressive strength of all materials decreased. It means that the repeated load cycling test used in this studyis adequate for evaluating durability of various dental materials.
The results were as follows:
1. In the condition of no loading in both dry and wet condition, resin cement indicated the highest compressive strength of all cements examined and was followed by glass ionomer cement, zinc phosphate cement and polycarboxylate cement. Glass ionomer cement was notably influenced in wet condition.
2. After 10, 000 cycles of loading in wet condition, resin cement indicated the highest compressive strength again and was followed by glass ionomer cement, polycarboxylate cement and zinc phosphate cement. In particular, compressivestrength of zinc phosphate cement decreased remarkably.
3. In the condition of no loading, visible light-cured composite resin core was superior to chemicalone. Visible light one was notably influenced in wet condition.
4. After 10, 000 cycles of loading, visible light-cured composite resin core was superior to chemical one.
