title: Comparative investigation of marginal adaptation of mineral trioxide aggregate and other commonly used root-end filling materials.
abstract: This study investigated the marginal adaptation of mineral trioxide aggregate (MTA) as a root-end filling material, compared with commonly used root-end filling materials by scanning electron microscopy (SEM). Eighty-eight single-rooted freshly extracted human teeth were cleaned, shaped, and obturated with gutta-percha and root canal sealer. Following root-end resection and cavity preparation, the root-end cavities were filled with amalgam, Super-EBA, Intermediate Restorative Material (IRM), or MTA. Using a slow-speed diamond saw, 40 roots were longitudinally sectioned into two halves. Resin replicas of resected root ends of the remaining nonsectioned roots were also prepared. After mounting longitudinal sections of roots and resin replicas of resected roots on aluminum stubs, the distance between the test root-end filling materials and surrounding dentin was measured at four points under SEM. Examination of the original samples showed numerous artifacts in the longitudinal sections of the specimens. In contrast, the resin replicas of resected and filled root ends had no artifacts. Statistical analysis of data comparing gap sizes between the root-end filling materials and their surrounding dentin shows that MTA had better adaptation compared with amalgam, Super-EBA, and IRM.
authors.affiliation: Department of Endodontics, School of Dentistry, Loma Linda University, California, USA.
authors.forename: M
authors.initials: M
authors.lastname: Torabinejad
authors.forename: P W
authors.initials: PW
authors.lastname: Smith
authors.forename: J D
authors.initials: JD
authors.lastname: Kettering
authors.forename: T R
authors.initials: TR
authors.lastname: Pitt Ford
mesh_terms: D017607:Aluminum Compounds; D000704:Analysis of Variance; D017610:Calcium Compounds; D003723:Dental Amalgam; D018772:Dental Marginal Adaptation; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D006801:Humans; D008768:Methylmethacrylates; D008855:Microscopy, Electron, Scanning; D010087:Oxides; D012184:Retrograde Obturation; D012387:Root Canal Filling Materials; D017640:Silicates; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D008768:Methylmethacrylates; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; D015035:Zinc Oxide-Eugenol Cement; C086631:mineral trioxide aggregate; C031667:IRM cement; D003723:Dental Amalgam; C084074:Super EBA