Resistance to fracture of crowned teeth restored with different post systems.

This study examined the effect of four different post systems, Cast Post, Para Post, Flexi-post and Fil Post, on the fracture resistance of crowned endodontically treated teeth. The Flexi-post and Para Post groups showed significantly higher resistance to fracture than the others. Horizontal root fractures were seen in the prefabricated post groups compared with vertical root fractures in the Cast Post group. Findings of this study suggest that the choice of prefabricated post systems is important in determining maximum resistance to fracture in teeth that have been endodontically treated.