Abstract
There are not a significant different between adhesive strength and compressive strength in case of whole dental cements, but resinous adhesives showed significant correlations. The various properties of resinous adhesives decreases with higher temperature, for with low softening temperature.
The compressive strength of resinous adhesives at the 37℃ and 60℃ were about 46% and 18% of the value at 23℃, while the adhesive strength at same conditions were about 95% and 65%. But, in case of composite resinous adhesive, the respective values were 85% and 78% in compressive strength, and 84% and 76% in adhesive strength.
However, even at the higher temperature, the absolute adhesive values of resinous adhesives are much higher than that of the conventional dental cements.
These cements were use in the mouth, which has higher temperature than the room temperature at which the test with many properties are generally done. Therefore, the measuring of adhesive strength should be done at a moderately high temperature for the above reasons.
This phenomenon may be one of the reasons concerning the decrease in adhesive strength over a long period.
