Dresden 2017 – scientific programme

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BP: Fachverband Biologische Physik

BP 22: Posters - Biomaterials and Biopolymers

BP 22.3: Poster

Tuesday, March 21, 2017, 14:00–16:00, P1A

Time dependent fluoride uptake in hydroxyapatite from aqueous NaF solution - How long should we brush our teeth? — •Thomas Faidt¹, Christian Zeitz¹, Samuel Grandthyll¹, Michael Hans², Matthias Hannig³, Karin Jacobs¹, and Frank Müller¹ — ¹Experimental Physics, Faculty of Natural Sciences and Technology, Saarland University, 66123 Saarbrücken, Germany — ²Functional Materials, Faculty of Natural Sciences and Technology, Saarland University, 66123 Saarbrücken, Germany — ³Clinic of Operative Dentistry, Periodontology and Preventive Dentistry, Faculty of Medicine - Clinical Medicine, Saarland University Hospital, 66421 Homburg, Germany

The application of fluoride containing products to protect tooth enamel from caries has been daily practice for many decades. However, to this day little is known about the time dependence of fluoride uptake in hydroxyapatite (HAP) which is the mineral component of human enamel. In our study, we use HAP pellet samples as a model system for the crystallites of tooth enamel. To investigate the time dependence of the fluoride uptake, samples were exposed to a fluoride solution (NaF, 500 ppm) for different times, resembling the tooth brushing process. XPS depth profiling revealed a saturation behavior both for the overall amount of fluoride taken up by the sample and for the thickness of the formed fluoridated layer. Our results show that the usual application times of about 2 minutes for, e. g., toothpastes are already in a range to ensure the maximum uptake of fluoride.