The friction coefficients for parotid and submandibular-sublingual salivas of 7 subjects were measured. At the load and speeds used, the lubricatory properties of the secretions followed the McKee-Petroff's curve. The friction coefficients for both secretions approximated those reported for boundary and thin film lubrication.
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Acknowledgement-Thisw ork was supportedi n part by USPHS grants PSO DE08420,P O1 DE01585,a nd NO1 DE52559f rom the National Instituteo f Dental Research.