title: The evaluation of the influence of using MTA in teeth with post indication on the apical sealing ability.
abstract: OBJECTIVE
  The aim of this study was to evaluate the influence of using MTA in teeth with post-core indication and to compare it with the immediate or delayed post space preparation on the integrity of apical seal in teeth filled with gutta-percha and sealer.
  
  
  METHODS
  Fifty-one single-rooted freshly extracted human maxillary incisor teeth were selected. The crowns of the teeth were removed to a length of 14 mm and canals were prepared by using K-files with the step-back technique. The teeth were randomly divided into 3 groups of 15 specimens each. Group A was filled with gutta-percha and sealer using lateral compaction, and post space was prepared immediately using a heated instrument. Specimens in Group B were filled with the same materials as Group A and post space was prepared after 1 week with Gates-Glidden drills. Group C was filled with MTA as an apical 5-mm filling. In all groups, materials were left in the root canals at the apical 5-mm level. The remaining 6 teeth were used as controls. The microleakage values of each group were measured after 1 month, using a computerized fluid filtration method.
  
  
  RESULTS
  The MTA (Group C) showed less microleakage than immediate and delayed post space preparation methods (Group A, B) in 1 month, and this difference was found to be statistically significant (P < .005). Additionally, no statistically significant difference was determined between Group A and Group B (P > .05).
  
  
  CONCLUSIONS
  These results suggest that MTA can be used in the root canals as apical filling material in teeth with post-core indication.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey.
authors.forename: Tahsin
authors.initials: T
authors.lastname: Yildirim
authors.forename: Tamer
authors.initials: T
authors.lastname: Taşdemir
authors.forename: Hasan
authors.initials: H
authors.lastname: Orucoglu
mesh_terms: D017607:Aluminum Compounds / Q000627:therapeutic use*; D017610:Calcium Compounds / Q000627:therapeutic use*; D001840:Dental Bonding; D003763:Dental Leakage / Q000145:classification; D004338:Drug Combinations; D004853:Epoxy Resins / Q000627:therapeutic use; D006171:Gutta-Percha / Q000627:therapeutic use; D006801:Humans; D007202:Indicators and Reagents; D007552:Isotonic Solutions; D008422:Materials Testing; D010087:Oxides / Q000627:therapeutic use*; D011176:Post and Core Technique; D012387:Root Canal Filling Materials / Q000627:therapeutic use*; D012389:Root Canal Obturation / Q000295:instrumentation / Q000379:methods; D018915:Root Canal Preparation / Q000295:instrumentation; D017640:Silicates / Q000627:therapeutic use*; D019810:Sodium Azide; D012965:Sodium Chloride; D013696:Temperature; D013997:Time Factors; D019227:Tooth Apex / Q000648:ultrastructure*
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D004853:Epoxy Resins; D007202:Indicators and Reagents; D007552:Isotonic Solutions; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C534916:epoxy resin-based root canal sealer; C086631:mineral trioxide aggregate; D012965:Sodium Chloride; D006171:Gutta-Percha; D019810:Sodium Azide