Comparison of microleakage in bonded amalgam restrorations using different adhesive materials: An invitro study

The objective of the this study was to comparatively evaluate the micro leakage in cavities prepared on the sample tooth with and without application of intermediate adhesive systems before condensation of amalgam, and to compare the sealing efficiency of different adhesive material in preventing the amount of micro leakage. Forty freshly extracted human teeth were collected and the samples were maintained and stored in normal saline until subjected to experimental procedure. Samples were randomly divided into control group and experimental groups. Control group (Groups-1) with no intermediate adhesive material. Group-2 is experimental group with copal varnish. Group-3 contains vitrebond as intermediate adhesive material and Group – 4 consist of clearfil-SE. After application of adhesive material, amalgam was condensed on the sample. Specimen was then immersed in .5% methylene blue dye for 8 hrs and sectioned in (B-L) plane for steriomicroscopic study. The results were drawn and tabulated using ANOVA test. Microleakage was found to be maximum in control group with no intermediate adhesive material. In experimental groups microleakage was maximum in group-II (Copal varnish) followed by group-IV (Clearfil-SE) and the least amount of microleakage was seen in group-III (Vitribond). Hence this study concludes that application of intermediate adhesive material before condensation of amalgam can act as an efficient barrier for microleakage.