Determination of Microleakage in CL V Amalgam Restoration Lined with and Without Varnish and Dentin Bonding Agents

The purpose of this study is to assess the microleakage in CL V Amalgam restoration lined with and without varnishes and dentine bonding agents. In this study, two varishes (Kimia and Copalite) and two dentin bonding agents (Syntac and Excite) were used. 70 fresh human premolars were selected for this study. These samples were randomly divided to five groups (four group of 15 teeth and one group of 10 teeth as negative control group). Then class V cavities were prepared on the buccul surface of teeth and four liners were applied before amalgam filling. The teeth were thermocycled for 700 cycles and then were immersed in 2% methylene blue for 24 hours.After immersion, the teeth were sectioned by a diamond disk. The degree of dye penetration was assessed with a stereo microscope.(* 40). For detecting the amount of microleakage a grading scale was used as follows:Grade zero: No dye penetration was detected.Grade one: Dye was involved about half of buccolingual walls of box.Grade two: Dye was involved whole of buccolingual walls of box, but it wasn’t involved axial wall.Grade three: Dye was involved both buccolingual and axial walls. Microscopic evaluation and Kkruskal Wallis test showed that Excite group had the least microleakage while the most microleakage was seen in Copalite group and there was a significant difference between these two groups.