Evaluation of Retention of Custom- Made Posts Using Different Types of Luting Cements – An In-Vitro Study

Abstract

This study was selected to evaluate and compare: The tensile strength of custom made posts using three different luting cements, namely Zinc phosphate cement (HARVARD), Glass ionomer cement (FUJI 1GC), Rely X U-100 Dual cure adhesive resin cement (3M ESPE). Sixty extracted single rooted mandibular premolar teeth were selected. Biomechanical preparation done, obturated and then post space prepared using peeso-reamer. The custom made nickel-chromium posts were fabricated for individual teeth. Posts were luted with three different adhesive luting cements and mounted on an acrylic block. The plastic cylindrical tubes were used to embed the specimens in auto polymerizing acrylic resin block. The whole assembly was gripped in a three jawed chuck and connected to the testing machine. The specimens were tested for tensile bond strength using an Instron testing machine. The machine was run to a cross head speed of 1mm/min. increasingly, heavy tensile load were applied to the specimen, till the post comes out the root canal by breaking the cement medium. The results were recorded in Newton’s and then converted to kilograms by dividing by 9.81. Retentive qualities were then statistically analyzed.