title: In vitro comparison of the setting of dry ProRoot MTA by moisture absorbed through the root.
abstract: This study explored the potential of dry ProRoot mineral trioxide aggregate (MTA) (Dentsply Tulsa Dental, Tulsa, OK) powder to set solely by moisture absorbed through the root. Thirty-three single-rooted extracted teeth were decoronated and instrumented. The canal was packed with dry powder, and the coronal and apical 4 to 5 mm was sealed with nail varnish. Teeth were grouped and submerged in physiologic saline as follows: group A, 12 hours; group B, 36 hours; and group C, 72 hours. After submersion, the teeth were sectioned, and a 5-lb pound weight was placed on the Proroot MTA for 1 minute. The surface was evaluated for any evidence of penetration or fracture at 15x magnification. Nine of 10 samples were set at 72 hours versus 4 of 10 at 36 hours and 1 of 10 at 12 hours. Statistical analysis using a McNemar test with a significance of p < 0.05 found the number of roots in which dry MTA powder set at 72 hours versus 12 hours was statistically significantly different (p = 0.0133).
authors.affiliation: University of Alabama at Birmingham, Birmingham, Alabama, USA.
authors.forename: Christopher Gene
authors.initials: CG
authors.lastname: Budig
authors.forename: Paul Duncan
authors.initials: PD
authors.lastname: Eleazer
mesh_terms: D000042:Absorption; D017607:Aluminum Compounds / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D003739:Dental Cementum / Q000502:physiology; D004338:Drug Combinations; D006801:Humans; D007180:Incisor; D010087:Oxides / Q000737:chemistry*; D010539:Permeability; D012387:Root Canal Filling Materials / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D013997:Time Factors; D014867:Water
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C086631:mineral trioxide aggregate; D014867:Water