title: A 24-week study of the microleakage of four retrofilling materials using a fluid filtration method.
abstract: The microleakage after retrofillings of amalgam, amalgam with cavity varnish, silver-containing glass ionomer cement, and intermediate restorative material was compared in vitro. Thirty-six extracted human incisors and canines were instrumented, obturated with gutta-percha without sealer, subjected to apicoectomy, and retrofilled with the materials described above. After removal of the gutta-percha filling, the microleakage from both directions (apically and coronally) was measured quantitatively and longitudinally for 24 wk after filling by a fluid filtration technique. All four retrofilling materials revealed some apical and coronal leakage at all time periods. The amalgam group showed statistically significant (p less than 0.001) apical leakage at 1.5 h. The use of cavity varnish significantly reduced the apical leakage of the amalgam group at 1.5 h. The silver-containing glass ionomer cement and intermediate restorative material groups showed significantly (p less than 0.05) less coronal leakage compared with the amalgam group at 1.5 h. Scanning electron microscopy of selected samples showed marginal defects of approximately 5 microns between the root dentin and the retrofilling material.
authors.affiliation: Department of Operative Dentistry, School of Dentistry, Hokkaido University, Sapporo, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Inoue
authors.forename: M
authors.initials: M
authors.lastname: Yoshimura
authors.forename: J S
authors.initials: JS
authors.lastname: Tinkle
authors.forename: F J
authors.initials: FJ
authors.lastname: Marshall
mesh_terms: D016722:Cermet Cements; D003723:Dental Amalgam; D003736:Dental Cavity Lining; D003763:Dental Leakage; D003764:Dental Materials; D003804:Dentin / Q000648:ultrastructure; D005054:Eugenol; D005374:Filtration; D006801:Humans; D008768:Methylmethacrylates; D008855:Microscopy, Electron, Scanning; D012116:Resins, Plant; D012184:Retrograde Obturation; D012387:Root Canal Filling Materials; D015034:Zinc Oxide; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D016722:Cermet Cements; D003764:Dental Materials; D008768:Methylmethacrylates; D012116:Resins, Plant; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C023806:Copalite; D005054:Eugenol; C031667:IRM cement; D003723:Dental Amalgam; D015034:Zinc Oxide