Regensburg 2004 – wissenschaftliches Programm
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SYLS: Life Sciences on the Nanometer Scale - Physics Meets Biology
SYLS 3: Symposium "Life Sciences on the Nanometer Scale - Physics Meets Biology"
SYLS 3.15: Poster
Mittwoch, 10. März 2004, 16:00–18:30, B
Acid-attack on Dental Enamel Investigated by Scanning Force Microscopy — •N. Schwender1, F. Al Marrawi2, K. Huber2, M. Hannig2, and C. Ziegler1 — 1Department of Physics, University of Kaiserslautern — 2Department of Operative Dentistry and Periodontology, Saarland University
As food or drinks always contain acids knowledge about the interaction of acids with dental enamel is important in preventive dentistry. Using the possibilities of Scanning Force Microscopy (SFM), the influence of acids on enamel surfaces was therefore investigated here. For this purpose, bovine enamel samples were ground flat, polished or cut by a diamond knife. Samples were treated with different acids such as phosphoric, citric, or hydrochloride acid, systematically changing the exposure time and the pH-value. Typical etch-patterns with a variation of height from the nano- to the micrometer scale as a result of mineral loss was observed. Distinct differences between the different acids could be observed which will be discussed taking into account the different reactivity of the components of enamel. Furthermore, the etched enamel shows a loss in stability and hardness noted by the erosion induced by the cantilever. In a further step the adsorption of saliva proteins such as BSA and lysozym on the etched surface compared to the undestroyed surface was investigated.