title: In vitro quantification of the apical sealing ability of retrograde amalgam fillings.
abstract: Retrograde amalgam fillings were placed in 12 extracted human canines. The microleakage from the both directions (coronally and apically) was determined using pressurized fluid filtration at 90 min, 6 h, 1 day, 2 days, and 1,2,4, and 8 wk after amalgam filling. Leakage from either direction decreased markedly in the 90-min to 6-h interval after filling. At intervals between 1 day and 8 wk, only small changes in leakage were noted. After any time period, leakage from the coronal direction was greater than leakage from the apical direction. However, this difference was not statistically significant except at 90 min when the coronal leakage was significantly greater. This experimental system was shown to reliably measure microleakage in retrograde amalgam fillings.
authors.affiliation: School of Dentistry Hokkaido University, Sapporo, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yoshimura
authors.forename: F J
authors.initials: FJ
authors.lastname: Marshall
authors.forename: J S
authors.initials: JS
authors.lastname: Tinkle
mesh_terms: D003481:Cuspid; D003723:Dental Amalgam; D003763:Dental Leakage / Q000175:diagnosis*; D003804:Dentin / Q000648:ultrastructure; D006801:Humans; D008855:Microscopy, Electron, Scanning; D012184:Retrograde Obturation; D012387:Root Canal Filling Materials
chemical_list: D012387:Root Canal Filling Materials; D003723:Dental Amalgam