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Effect of Saliva on pH in Different Regions of the Mouth

  • Suzuki Yoshitaka
    Department of Pediatric Dentistry, Meikai University School of Dentistry
  • Watanabe Shigeru
    Department of Pediatric Dentistry, Meikai University School of Dentistry

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  • 口腔内各部位のpHの変動に与える唾液の影響

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Abstract

The aim of this study was to develop a method of continuous intra-oral pH monitoring of the tooth surfaces at different regions and to evaluate the influence of saliva on the pH at different regions of the mouth. Ion-sensitive field-effect transistor (ISFET) pH electrodes were used to record the pH changes. The electrodes were fixed using adhesive resin on the buccal surface of an upper first molar (UPB), the lingual surface of a lower incisor (LALi) and on the labial sarface of an upper incisor (UAB). After the flow rates and pH were monitored in 'resting condition', the tip of tongue was stimulated by the filter paper disc soaked in 5% citric acid. Parotid saliva was collected from a single salivary gland with Lushley cannulae and the pH of the UPB at the other site was monitored simultaneously. To determine the influence of saliva on the pH at different regions of the mouth, the pH was monitored continuously at the UPB, LALi and UAB before and after the stimulation. The flow rates were increased after 6.6 seconds of the stimulation, and still showed maximum pH at 13 seconds. The maximum pH at the UPB region was recorded after 153 seconds later than the maximum flow fates. The mean highest pH of the UPB and LALi regions were 6.32±0.38 and 7.17±0.12, respectively, while the pH at the UAB region did not show any change after the stimulation. In conclusion our results suggest that the pH at different regions in the mouth was strongly effected by the saliva.

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