FRACTURE RESISTANCE OF A NOVEL TITANIUM POST

Objectives: The aim of this study was to evaluate fracture strength of a novel titanium post design. This new dental post was designed to minimize stresses at remaining tooth tissues.
Methods: Fracture resistance testing of the post/core/root complex, fracture analysis were used to post evaluation. Thirty freshly extracted maxillary canin were used and the crowns were removed. The root canals were enlarged to size 45#. The prepared root canals were filled with gutta-percha cones and AH Plus sealer by lateral condensation technique. Filled roots were incubated at 37˚C for 1 week under humid conditions. Post spaces were prepared using Parapost drills to a depth of 10 mm. The roots were embedded in a self-curing polymethyl-methacrylate resin and randomly divided into three groups: Group 1: Novel post with two washers, Group 2: Novel post without washer, Group 3: Parapost. Then all posts were cemented with zinc phosphate cement. Composite resin cores were created and the specimens were angle of 45° loaded (1mm/min), the force that was required to fracture each sample was recorded (N) and analyzed (Kruskal Wallis and Mann Whitney-U tests). Fracture types were recorded.
Results: There was a statistically significant difference among the groups (p=0.03). Fracture strengths of Group 1 (718,3±336,4) was significantly higher than the group 2 (582,5±158,12) and group 3 (448,9±152,61). No significant difference was found between the group 2 and group 3 (p=0.88).
Conclusions: Novel post with two washers presented better results fracture strength and repairable fractures.