- irreversible hydrocolloid
- a hydrocolloid that can be converted from the sol to the gel condition but cannot be reverted to a sol by any simple means. Common examples are the soluble alginates (see alginate).
Medical dictionary. 2011.
Medical dictionary. 2011.
hydrocolloid — A gelatinous colloid in unstable equilibrium with its contained water, useful in dentistry for impressions because of its dimensional stability under controlled conditions. irreversible h. a h. whose physical state is changed by an irreversible … Medical dictionary
alginate — An irreversible hydrocolloid consisting of salts of alginic acid, a colloidal acid polysaccharide obtained from seaweed and composed of mannuronic acid residues; used in dental impression materials. * * * al·gi·nate al jə .nāt … Medical dictionary
impression — 1. A mark seemingly made by pressure of one structure or organ on another, seen especially in cadaveric dissections. See also groove for the various impressions of the lungs, e.g., descending aorta, subclavian artery, and vena cavae. 2. An … Medical dictionary
Colloid — Milk is an emulsified colloid of liquid butterfat globules dispersed within a water based solution. A colloid is a substance microscopically dispersed evenly throughout another substance.[1] A colloidal system consists of two separate phases: a… … Wikipedia
colloid — 1. Aggregates of atoms or molecules in a finely divided state (submicroscopic), dispersed in a gaseous, liquid, or solid medium, and resisting sedimentation, diffusion, and filtration, thus differing from precipitates. SEE ALSO: hydrocolloid … Medical dictionary