ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 60, (2) 105 - 114 (2016)


CORROSION IN ACIDIC BEVERAGES AND RECOVERY OF MICROHARDNESS OF HUMAN TEETH ENAMEL
 
Gaalová Petra 1, Galusková Dagmar 1, Kováč J. 2, Kováč D. 2, Galusek Dušan 1
 
1 Vitrum Laugaricio - Joint Glass Center of the Institute of Inorganic Chemistry, SAS, Alexander Dubček University of Trenčín, and Faculty of Chemical and Food Technology, Slovak University of Technology, Študentská 2, 911 50 Trenčín, Slovakia
2 Faculty of Medicine, Comenius University of Bratislava, Vajanského nábrežie, 811 02 Bratislava, Slovakia

Keywords: Human tooth enamel, Microhardness, Corrosion, Recovery
 

We studied the influence of corrosion in acidic beverages (white wine, pH~3.5) on micromechanical properties of human teeth. Simultaneously, the effect of fluorine-containing mouthwash (pH~4.4) and of artificial saliva (pH~5.3) in terms of their protective action against corrosion, and the recovery of mechanical properties through fluoridation and re-calcification was studied. The influence of the solutions on Vickers hardness of dental enamel was monitored on the basis of results from the corrosion tests carried out under quasi-dynamic conditions. The tests were performed at the temperature corresponding to the temperature of human body (37°C). The measurements confirmed a significant deterioration of microhardness with prolonged exposure to white wine. The Vickers hardness decreased from 347 HV0.2 in un-corroded specimens to 186 HV0.2 in samples corroded for 60 minutes in white wine. A recovery of Vickers hardness was observed after 60 minutes exposition time in the fluoridation solution, with the increase from 186 to 372 HV0.2. Similar effect was observed in the artificial saliva solution, with observed hardness increase from 186 to 320 HV0.2. Healing of corrosion-induced defects by the action of both solutions was observed by SEM, and associated with observed increase of hardness


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doi: 10.13168/cs.2016.0016
 
 
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