Methods:
: Standardized class II inlay preparations were made in twenty extracted sound human third molars. Indirect composite inlays were made using Z100 (3M, ESPE) composite resin. They randomly divided into two groups (n=10) according to the cementing agents. In group 1 Maxcem (self-adhesive resin cement-3M, ESPE) and in group 2 RelyX ARC (etch & rinse resin cement-3M, ESPE) were used according to the manufacturer’s instructions as luting cement. After 24h storage in 100% moisture inside an incubator, they subjected to 500 thermal cycling. The specimens were embedded in 0.5% fushin solution for 24h and sectioned in mesio-distal direction. Dye penetration were analyzed under a stereomicroscope (magnification of ×20) using a scale of 0-3. The data were analyzed using a non-parametric Mann-whitney U test at a P<0.05 level of significance.
Results:
: In group 1 after 24 h, 50% of specimens have no leakage and 40% showed index 1 and 10% showed index 2 .The results for group 2 were 90% no leakage and 10% showed index 1. The difference of leakage degree in two groups was statistically significant (p<0.05).
Conclusions:
Within the limitation of this in vitro study, etch&rinse resin cement showed significantly less microleakage in enamel after 24h.