irreversible hydrocolloid


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Related to irreversible hydrocolloid: alginate

ir·re·vers·i·ble hy·dro·col·loid

a hydrocolloid the physical state of which is changed by an irreversible chemical reaction when water is added to a powder and an insoluble substance is formed.

irreversible hydrocolloid

A hydrosol of alginic acid whose physical state is changed by an irreversible chemical reaction, forming insoluble calcium alginate. This substance is called alginate or dental alginate. Alginate is used in dentistry as a primary impression material. Synonym: alginate

CAUTION!

Care should be taken not to inhale the dust created by alginate.
See also: hydrocolloid

ir·re·vers·i·ble hy·dro·col·loid

(irrĕ-vĕrsi-bĕl hīdrō-koloyd)
A hydrocolloid the physical state of which is changed by an irreversible chemical reaction when water is added to a powder and an insoluble substance is formed.
References in periodicals archive ?
Due to their low cost and easy handling, irreversible hydrocolloids are one of the most commonly used impression materials in dental practice.
(4) Compared to other impression materials, irreversible hydrocolloids have the disadvantages of low dimensional stability and reduced capacity for detail reproduction.
when irreversible hydrocolloid material is thicker mixed and loaded tray insert and seated in the mouth, material may not flow into the interdental spaces properly and cannot obtained the tissue record.
If alginate material mixed in thin consistency it would be hard to handle and escape from the tray which cause the voids formation in impression of irreversible hydrocolloid is difficult to control in the impression tray and may flow out from the tray and cause voids in the impression, thus results inaccurate production of the anatomy of soft tissues.
Schwartz, Efficacy of various spray disinfectants on irreversible hydrocolloid impressions.
Schuster, Sodium hypochlorite disinfection of irreversible hydrocolloid impression material.
Collares, Influence of delayed pouring on irreversible hydrocolloid properties.
Grant, Measurement of the viscosity of irreversible hydrocolloids. Journal of oral rehabilitation, 1993; 20(4): 379-84.
28 Muller-Bolla M et al in their study tried to find out that whether different disinfectants are needed for different impression materials and concluded that same disinfection procedure for both irreversible hydrocolloid and silicone impressions was used by 78% of European Union dental schools with almost same efficacy.29
Impressions were made using reversible hydrocolloid for the lower arch and irreversible hydrocolloid for the upper arch and casts were poured with dental stone.
Zinc oxide eugenol impression paste is a material of choice for functional impression whilst irreversible hydrocolloid is suitable for an anatomic impression.
Characterization of airborne particles from irreversible hydrocolloids. J Am Dent Assoc 1977;94:501-4.