title: The effect of post space preparation in teeth obturated with Mineral Trioxide Aggregate evaluated using a fluid filtration system.
abstract: The aim of this study was to evaluate the seal of a 4-mm Mineral Trioxide Aggregate (MTA) filling after post space preparation. Forty single-rooted premolar teeth without curved root anatomy and fractures were selected. The root length was standardized to 12 mm by removing excess from the apical end. The roots were instrumented to a 50 K-file by the step-back technique. The roots were randomly divided into groups A and B, of fifteen each. In group A, the canals were obturated with 7 mm of white MTA. After 24 h, 3 mm of MTA was removed to simulate post space preparation using a long shank diamond round bur. In group B, the canals were filled with 4 mm of white MTA. All samples were attached to a fluid filtration device. Measurements (µl min⁻¹ cm H₂O⁻¹) were taken every 2 min, for 10 min and data were analyzed by an independent t-test (P > 0.05). Fluid transport averaged in groups A and B at 9.2 × 10⁻⁴, and 11.8 × 10⁻⁴ µl min⁻¹ cm H₂O⁻¹, respectively. Independent t-test showed no significant difference between the groups (P < 0.05). Removing set MTA using a round bur for post space preparation does not affect its sealing ability, when 4 mm of MTA remains.
authors.affiliation: Department of Endodontics, Dental School, Hamadan University of Medical Sciences, Hamadan, Iran. jalalzadeh@umsha.ac.ir
authors.forename: Seyed Mohsen
authors.initials: SM
authors.lastname: Jalalzadeh
authors.forename: Ahmad
authors.initials: A
authors.lastname: Mamavi
authors.forename: Elham
authors.initials: E
authors.lastname: Khoshbin
authors.forename: Vrginia
authors.initials: V
authors.lastname: Karapanou
authors.forename: Zahed
authors.initials: Z
authors.lastname: Mohammadi
mesh_terms: D017607:Aluminum Compounds; D017610:Calcium Compounds; D003763:Dental Leakage / Q000517:prevention & control*; D004338:Drug Combinations; D005374:Filtration; D006801:Humans; D057446:Hydrodynamics; D010087:Oxides; D011176:Post and Core Technique; D019233:Retreatment; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000379:methods*; D018915:Root Canal Preparation / Q000379:methods*; D017640:Silicates
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C086631:mineral trioxide aggregate