ABSTRACT
This study was done to evaluate the rate of microleakage in class V amalgam restorations in which the dental bonding agent [DBA] Excite was used as a sealer beneath the restorations. Four amalgam restorative materials with commercial names of Dentam, Cinalux, Tytin and SDI [GS-80] were used. Seventy sound human premolars were selected and randomly divided into 4 groups of 15 teeth and 2 groups of 5 teeth as negative and positive control groups]. Class V cavities were prepared on the buccal surface of each tooth, Excite was applied on the surface of all cavities and then teeth were cured and restored with four selected amalgam restorative materials. Then teeth were thermocycled [500 cycles] and immersed in 2% methylen blue solution for 24 hours. After immersion, teeth were thoroughly washed with tap's water, and sectioned using a diamond disk. Based on microscopic evaluation and Kruskal-wallis test, Cinalux [An amalgam filling material manufactured in Iran] showed maximum of microleakage in comparison to other amalgam filling materials used in this study, however it's value was not significant