Fluoride uptake by cavity walls following application of Duraphat around amalgam restorations.
This study aimed to assess possible fluoride uptake by cavity walls following a single application of Duraphat around class V or I amalgam restorations which were inserted in seventeen human premolars in vitro and in vivo. Six cavities were lined with one layer of Copalite before insertion of the restorations. After a week in vivo and 12--24 h in vitro, 200--300 micrometers thick longitudinal sections passing through the cavities were prepared. By electron probe microanalysis F concentrations ranging from 2000 to 6000 ppm were measured near the surface of the cavity walls. Copalite seemed to inhibit F uptake. The study indicates that F ions released from the Duraphat varnish have been taken up by the cavity walls. Such uptake may influence development of secondary caries (wall lesions) in connection with amalgam restorations.
D002648:Child; D003723:Dental Amalgam; D003736:Dental Cavity Lining; D003743:Dental Enamel / Q000378:metabolism*; D003764:Dental Materials; D003793:Dental Restoration, Permanent; D004577:Electron Probe Microanalysis; D005459:Fluorides / Q000378:metabolism*; D005460:Fluorides, Topical; D006801:Humans; D007764:Lacquer; D012116:Resins, Plant; D012969:Sodium Fluoride / Q000378:metabolism
D003764:Dental Materials; D005460:Fluorides, Topical; D012116:Resins, Plant; C023807:sodium fluoride topical preparation; C023806:Copalite; D003723:Dental Amalgam; D012969:Sodium Fluoride; D005459:Fluorides