Measurement of Viscosity of Artificial Saliva by Rotating Viscometer Method (CAT#: STEM-PPA-0022-YJL)

Introduction

The effect of the physiological protection of the oral cavity depends on the physical properties of saliva and the change in the rheological properties of saliva has become the subject of increasing research in salivary diagnostics. By the mechanism of self-purification, saliva protects against the occurrence of the most common oral diseases, caries and periodontitis.
Generally, when the symptoms of dry mouth occur, patients are advised to drink large quantities of water, but, water is not able to provide sufficient hydration and lubrication and does not have antimicrobial properties. Saliva preparations or substitutes are recommended as a better solution, since these solutions have a higher viscosity compared to water that is closer to the viscosity of natural saliva.
Salivary substitutes expressing acidic behavior have a distinct erosive potential, however most products with higher viscosity exhibit an erosion protective effect.

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Principle Applications Procedure Materials Notes Related Products

Principle

The principle of the rotating viscometer method to measure the force acting on a rotor (torque) when it rotates at a constant angular velocity (rotational speed) in a liquid. Rotating viscometers are used for measuring the viscosity of Newtonian (shear-independent viscosity) or non-Newtonian liquids (shear dependent viscosity or apparent viscosity). Rotating viscometers can be divided in 2 groups, namely absolute and relative viscometers. In absolute viscometers the flow in the measuring geometry is well defined.
The measurements result in absolute viscosity values, which can be compared with any other absolute values. In relative viscometers the flow in the measuring geometry is not defined. The measurements result in relative viscosity values, which cannot be compared with absolute values or other relative values if not determined by the same relative viscometer method. Different measuring systems are available for given viscosity ranges as well as several rotational speeds.

Applications

Mineral oil industry; Food industry; Cosmetic/pharmaceutical industry; Petroleum industry; Chemical industry

Procedure

1. Pour the liquid into the measuring cup.
2. Insert the spindle into the liquid.
3. Rotate the spindle and measure the resistance.

Materials

• Sample Type: liquid, gel-like, or semi-solid everyday substances

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