Investigation of the effect of different prefabricated intracanal posts on fracture resistance of simulated immature teeth

Aim The aim of this study was to assess fracture resistances of simulated immature single‐rooted teeth whose roots have been backfilled using 3 different post systems after a 4 mm apical mineral trioxide aggregate (MTA) placement. Materials and methods Forty‐eight maxillary anterior teeth were assigned into four groups. The lengths of each root were standardized by cutting off the coronal and apical portions to obtain 13 ± 1 mm samples and root canals were enlarged. The #6 Peeso reamers were allowed to protrude 1 mm beyond apex to simulate immature teeth. Apical 4 mm of each tooth was filled using MTA. The remaining portions were treated as follows: Group 1 (Control): AH Plus + Gutta‐percha cold lateral compaction. Group 2: Glass fiber posts (FRC Postec Plus post) cemented using self‐adhesive resin cement. Group 3: Quartz fiber posts (D.T. Light post) cemented using self‐adhesive resin cement. Group 4: Zirconia posts (Cosmopost) were placed using self‐adhesive resin cement. Specimens were embedded in self‐curing acrylic. A compressive load was applied lingually at a crosshead speed of 1 mm/min at an angle of 45º until fracture in a universal testing machine. Results The mean fracture resistances were 823.17 ± 188.80, 1155.50 ± 190.37, 1208.00 ± 254.32, and 1153.25 ± 195.71 Newtons for Groups 1, 2, 3, and 4, respectively. All experimental groups had significantly higher fracture resistance compared with the control group (P 0.05). Conclusions All post systems exerted a similar reinforcing effect to a simulated immature tooth and may be preferred specifically in situations which require additional reinforcement.