Berlin 2015 – scientific programme

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MI: Fachverband Mikrosonden

MI 1: Microanalysis and Microscopy of Biological Materials

MI 1.3: Talk

Monday, March 16, 2015, 11:00–11:15, EMH 225

Microstructure diagnostics of fluoride interaction with human dental tissue — •Matthias Petzold, Lutz Berthold, and Andreas Kiesow — Fraunhofer Institute for Mechanics of Materials IWM Halle, Walter-Huelse-Strasse 1, 06120 Halle, Germany

In dentistry, fluoride compounds play a crucial role particularly for caries prevention. Topical treatments of teeth using e.g. fluoridated tooth pastes or mouth rinses result in surface microstructure changes. In addition to clinical and (bio-)chemical studies, methods like electron microscopy and X-ray analyses allow contributing to establish more substantiated models of how fluorides interact with the tooth surface. In the presentation, a short introduction is given on current understanding of topical fluoridation of dental enamel and dentine. Results of case studies on calcium fluoride-like precipitate formation on dental enamel after treatment with amine fluoride-containing products will be presented. In addition, findings from HR-TEM/EDX studies comparing different fluoride compounds are discussed that contribute to a deeper understanding of the effects of pH and fluoride compound on fluoride interaction modes. In addition to calcium fluoride-like reaction products formed at the tooth surface, attention is also given to the microstructure of the dental enamel beneath the surface layers. The results presented will be compared to current models published in literature regarding the mode of action of fluorides. In this context, open questions and future research needs regarding fluoride interaction with dental enamel and dentine will also be highlighted.