title: Investigation of the effect of different prefabricated intracanal posts on fracture resistance of simulated immature teeth.
abstract: OBJECTIVE
  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.
  
  
  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 < 0.01). No statistically significant difference was noted between the experimental groups (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.
authors: Faculty of Dentistry, Department of Prosthodontics, Yeditepe University, Istanbul, Turkey.
authors: Idil
authors: I
authors: Dikbas
authors: Jale
authors: J
authors: Tanalp
authors: Temel
authors: T
authors: Koksal
authors: Ayşe
authors: A
authors: Yalnız
authors: Tufan
authors: T
authors: Güngör
mesh_terms: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D006801:Humans; D010087:Oxides; D011176:Post and Core Technique; D017640:Silicates; D014082:Tooth Fractures / Q000517:prevention & control*
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D017640:Silicates; C086631:mineral trioxide aggregate
keywords: fracture resistance; glass fiber post; immature teeth; mineral trioxide aggregate; quartz fiber post; zirconia post