fluid exuded from the impression seen as droplets on surface are called syneresis
Absorption of water by the impression when placed in water is called imbibition.
Addition silicones have very little residual polymerization, making them the most dimensional you stable of all the dental materials. They are also highly biocompatible impression materials.
Larger, visible, non-soluble particles in solvent. It exists as 2-phase system.
Liquid droplets which are suspended in water.
A solid, liquid, or a gaseous substance made up of large molecules or masses of small molecules that remain in suspension in a surrounding continuous medium of different matter.
A compound that speeds up the reaction; also refers to the component called the catalyst in the reaction of impression materials.
A dimensionally accurate reproduction of a part or parts of the oral cavity or extra oral facial structures produced in a durable hard material.
A polymerisation reaction in which each polymer chain grows to a maximum length in sequence and no reaction byproduct is formed.
A polymerisation process in which the polymer chains grow simultaneously and a reaction by-product is formed with associated shrinkage.
The reaction process that takes place primarily during the setting of a polymer but continues after setting.
The total time from the start of mixing to the final time at which an impression tray can be fully seated without distortion.
The elapsed time from the star of mixing until the impression material becomes firm enough to resist permanent deformation .
Irreversible change in shape that occurs when the polymer responds as a viscous liquid under an applied pressure.
Characteristic of a material to become more fluid when an applied force is increased; this behaviour involves shear thinning and is strain rate dependent.
An element of the viscoeladtic model describing the viscous response of a polymer.
admin | Dec 1,2016
it should be explain with example.