RIGIDITY AND RETENTION OF CARBON-FIBER VERSUS STAINLESS-STEEL ROOT-CANAL POSTS

Two of the main requirements of a root canal post are that it is rigid so as to resist flexing under functional load, and that it is well re tained in the root. This study compared these properties in two differ ent 1-mm diameter root canal posts-smooth carbon fibre posts (Endopost ) and serrated stainless steel posts (Parapost). Ten posts of each typ e were tested for rigidity in a three-point bend test. Ten posts of ea ch type were cemented with resin cement into the roots of endodontical ly treated, extracted teeth. The tensile force required to remove the posts was recorded, The Paraposts proved to be significantly more rigi d under load (P < 0.001) and significantly more strongly retained in t he tooth roots (P < 0.005). The Parapost appears to be a mechanically superior post for the restoration of root-filled teeth with narrow dia meter root canals.