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UNSTIMULATED HUMAN PAROTID FLUID SPECIFIC GRAVITY AND OSMOLALITY.
Final rept. Apr-May 67,
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX
Pagination or Media Count:
Parotid fluid was collected without exogenous stimulation from 503 systemically healthy young adult males. The specific gravity and osmolality of this fluid were measured and correlations were sought with oral health status. Neither specific gravity nor osmolality was significantly related to either dental caries experience or periodontal status. The rate of flow was negatively correlated with both specific gravity and osmolality. Thus, as flow rates became lower, there w was a concurrent increase in both the number of particles present and the mass of each unit volume of parotid fluid. The concentrating effect of decreased flow rate in unstimulated parotid fluid is distinctly different from the changes found when flow rate decreases under exogenous stimulation. Increased passive diffusion of water from the duct lumen down an osmotic gradient produced by sodium reabsorption is offered as a possible explanation for the increased specific gravity and osmolality as the fluid remains in the duct system for longer and longer periods of time. Author
APPROVED FOR PUBLIC RELEASE