Human parotid saliva collected at flow rates ranging from 0.1 to 2.0 ml/ min was analyzed for ionized calcium and inorganic phosphate concentrations, pH and total ionic strength. Calculations showed that the saliva was supersaturated with respect to hydroxyapatite (HAP) and β-tricalcium phosphate (TCP) and unsaturated with respect to dicalcium phosphate dihydrate (DCPD) at all flow rates. At flow rates higher than 0.2 ml/min the saliva was also supersaturated with respect to octacalcium phosphate (OCP). After varying the pH level within the range 5.0–8.0, the saliva was found to be just saturated or unsaturated with respect to DCPD at all levels. At pH values lower than 5.5, 6.4 and 6.9, the saliva became unsaturated with respect to HAP, TCP and OCP, respectively.

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