In vitro sealing ability of dentin bonding agents and cavity varnish with amalgam as retrofills

The aim of this study was to test the effect on the seal produced by an ama lgam retrofill of two dentin bonding agents (Amalgambond and All-Bond) and a cavity varnish (Copalite). The three materials were tested when placed be fore the retrofill (group I) and before and after the retrofill (group II). Ninety teeth distributed into three groups were prepared for the retrofill ing. Each group was divided into subgroups of I and II. Linear apical leaka ge was measured by a stereomicroscope after 1 month in dye. All materials p ermitted dye leakage around the retrofill, regardless of the application ty pe. No statistical difference was found between the Amalgambond subgroups o r between the All-Bond subgroups. There was less leakage in varnish group I than group II. Amalgambond group I leaked significantly less than All-Bond group I.