COMPARISON OF RETENTIVE PROPERTIES OF 4 POST SYSTEMS

This study compared the retention of posts in the root for various diameters (1.3 mm and 1.6 mm) of three prefabricated post systems (Unity, Filpost, and Brasseler) with that of the previously reported No. 1 and No. 2 Flexi-Post systems. The experiment was divided into three groups comprising 10 samples for each post system studied. In group 2, the Filpost system was cemented both with a resin cement and zinc phosphate cement. Retention values were obtained with a modified universal testing machine. The retention of 1.3 mm posts from most to least retentive was Flexi-Post (zinc phosphate) > Filpost (zinc phosphate) > Filpost (resin) > Brasseler (zinc phosphate), > Unity (resin). The retention of 1.6 mm posts from most to least was Flexi-Post (zinc phosphate) > Filpost (zinc phosphate) > Brasseler (zinc phosphate), Unity (resin) > Filpost (resin). The Filpost system achieved higher retention with zinc phosphate cement than it did with resin cement.