In vitro fracture resistance of glass-fiber andcast metal posts with different designs

Abstract

Purpose: To evaluate the in vitro fracture resistance of roots with glass-fiber and metal dowels with different designs. Methods: Fifty-endodontically treated maxillary central incisors were embedded in acrylic resin. Ten of them received only the coronary preparation, and the remaining forty were embedded (except for 4mm of the cervical area) after removing the clinical crowns. Specimens were divided into five groups (n=10): control (teeth with only coronary preparation), cylindrical cast dowel, conical cast dowel, cylindrical glass-fiber dowel and conical glass-fiber dowel. Specimens were subjected to an increasing compressive load (N) until fracture. Results: ANOVA indicated significant difference (P