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Measurement of Viscosity of Silver Nanoparticles as an Irrigation Solution by Rotating Viscometer Method (CAT#: STEM-PPA-0028-YJL)

Introduction

fficient disinfection of root canal system is highly dependent on the ability of irrigants to penetrate dentin and its tubules [1]. The capability of irrigants to access apical third of the root canal system as well as penetration to dentinal tubules mainly depends on the irrigants’ characteristics such as dynamic viscosity and surface tension. Dynamic viscosity is the resistance exhibited by a liquid as it is being reshaped by shear or tensile stresses; hence, less viscosity allows the fluid to flow easier.<br />Irrigation solutions can affect surface properties of dentin such as wetting ability, which in turn can influence the adhesion of bacteria and regulate the interaction between dentin and restorative materials. In recent years, interest in the use of silver nanoparticles (AgNPs) as root canal irrigants or medicaments has developed in dentistry especially in endodontics. These particles appear to prevent the development of resistance by the organisms because of their rapid reaction between the target cells and them. They are highly active against bacteria while compatible to human cells.




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