The establishment of caries risk diagnosis by the pH monitoring.

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The following was studied in this fiscal year. The pH of 3 positions in the oral cavity is monitored simultaneously, by the change of the salivary flow rate, and also examined the effect of saliva on the change of pH. Flow velocity, pH, personal change of buffer capacity of the saliva are examined and after the plaque deposits, the aspect of the recovery after pH decrease by sugar solution is monitored.After the calibration, the pH of LALi for all examinees hardly changed from that of the adjustment liquid (pH:6.86) until rinsing by the acid solution, while the pH of the UPB and UAB regions was lowered to around 6.2. After rinsing the mouth with the acid beverage, the pH dropped to 3.3, and it gradually recovered. At the LALi region, the mean time of recovery to the original pH was 92.2 ± 89.1 seconds but the pHs at the UPB and UAB regions recovered to the original pH very slowly and at 30 minutes after rinsing, the mean pHs of UPB and UAB were 5.1 ± 0.3 and 4.7 ± 0.3, respectively. Both were significantly different (p<0.001) from the pH at the LALi sites.The individual range of salivary flow rate, pH and the buffer capacity varied considerably relative to the overall range. The variation of the calcium and phosphate concentration in stimulated saliva was smaller than those in unstimulated saliva There was the positive correlation between salivary flow rate and buffer capacity in total adult samples (p<0.05).In the experiment which examines the recovery of pH after pH decrease by the sugar solution, it was difficult that the plaque is made to deposit on the sensor, and the improvement of the experimental method seemed to be the necessity.