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Journal of Dental Research
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Biological

Immediate Erosive Potential of Cola Drinks and Orange Juices

T. Jensdottir1,*,2, P. Holbrook3, B. Nauntofte1, C. Buchwald4 and A. Bardow1

1 Department of Oral Medicine, School of Dentistry, University of Copenhagen, Nørre Alle 20, 2200 Copenhagen N, Denmark;
2 Toms Group A/S, Ballerup, Denmark;
3 Faculty of Odontology, University of Iceland, Vatnsmyrarvegur 16, 101 Reykjavik, Iceland; and
4 Department of Otolaryngology, Head and Neck Surgery, Rigshospitalet, Copenhagen, Denmark

Correspondence: * corresponding author, tje{at}odont.ku.dk

Little is known about the erosive potential of soft drinks within the first minutes of exposure to teeth, and about the potentially protective role of salivary proteins. We hypothesized that the erosive potential is determined primarily by pH and decreases in the presence of salivary proteins. To investigate this, we first added uncoated hydroxyapatite crystals and, second, salivary-protein-coated hydroxyapatite crystals to 20 commercially available cola drinks and orange juices simultaneously, with pH recordings every 15 sec for 3 min. The amount of apatite lost per liter of soft drink per sec was calculated from titratable acidity values to each pH obtained by crystal addition. The erosive potential within the first minutes of exposure was determined solely by the pH of the drink, and the erosive potential was ten-fold higher in cola drinks compared with juices. However, salivary proteins reduced the erosive potential of cola drinks by up to 50%.

Key Words: erosion • soft drinks • human salivary proteins • hydroxyapatite crystals

Journal of Dental Research, Vol. 85, No. 3, 226-230 (2006)
DOI: 10.1177/154405910608500304
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