Fracture strength of flared bovine roots restored with different intraradicular posts

The aim of this study was to evaluate the fracture strength and failure mode of flared bovine roots restored with different intraradicular posts. Fifty bovine incisors with similar dimensions were selected and their roots were flared until 1.0 mm of dentin wall remained. Next, the roots were allocated into five groups (n=10): GI- cast metal post-and-core; GII- fiber posts plus accessory fiber posts; GIII- direct anatomic post; GIV- indirect anatomic post and GV- control (specimens without intraradicular post). A polyether impression material was used to simulate the periodontal ligament. After periodontal ligament simulation, the specimens were subjected to a compressive load at a crosshead speed of 0.5 mm/min in a servo-hydraulic testing machine (MTS 810) applied at 135 masculine to the long axis of the tooth until failure. The data (N) were subjected to ANOVA and Tukey's post-hoc test (alpha=0.05). GI and GIV presented higher fracture strength (p0.05) from GI, GII and GIV. Control specimens (GV) produced the lowest fracture strength mean values (p