[Studies concerning the effect of sport drinks on hydroxyapatite dissolution].

Abstract

The purpose of this study was to evaluate the erosive properties of sport drinks and to clarify the facts which effect these properties. We analysed the contents of 3 kinds of sport drinks and measured their capacity to dissolve hydroxyapatite in vitro under several duration times. The following results were obtained: 1) The pH Values of the sport drinks ranged from 2.91 to 4.07. 2) The total sugar concentration of the sport drinks ranged from 3.24 to 5.95%. The sugar were consisted mainly to sucrose, glucose and fructose, but their proportion in the sport drinks had different values respectively. 3) After stirring for 1 and 5 minutes, there was a negative correlation (Spearmann's rank correlation coefficient test) between the pH values of the sport drinks and the amounts of Ca2+ released into them. And after stirring for 10 and 20 minutes, there was a negative correlation between the Ca concentrations of the sport drinks and the amounts of Ca2+ released into them. 4) The addition of sugar to the sport drinks showed no effect on their capacity to dissolve hydroxyapatite. The results suggested that tooth erosion depends on the pH value of the sport drink at the early stage when the tooth contacted it, and also tooth erosion depends on the Ca concentration of the sport drink when the tooth is in contact with it for a long time.