hydrocolloid (hI-dro-kol´oyd)

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 chemical reaction when water is added to a powder and an insoluble substance is formed.
reversible h. a h. composed of a base substance whose physical state may be changed to that of a liquid by the application of heat and then changed to that of an elastic gel by cooling.


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