The evaluation of the influence of using MTA in teeth with post indication on the apical sealing ability.
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.
Yildirim
Tahsin
T
Department of Restorative Dentistry, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey.
Taşdemir
Tamer
T
Orucoglu
Hasan
H
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*
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