Compatibility of irreversible hydrocolloid impression materials with dental stones

Carlyle, L. W.

doi:10.1016/0022-3913(83)90290-1

Cited by 15 publications

(1 citation statement)

References 21 publications

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“…They recommended that efforts be made to formulate alginates to reduce the concentrations of sodium and sulfate ions in the exudate formed on the surface of the set alginate. Carlyle (1983) and Eames et al (1978) reported on the compatibility of gypsum products with alginates and agars. Both showed that various combinations of hydrocolloid and gypsum products had variations in compatibility and that attention should be paid to selection of a compatible pair.…”

Section: Techniquesmentioning

confidence: 99%

Review of Dental Impression Materials

Craig

1988

Adv Dent Res.

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M ajor advances in impression materials and their application have occurred during the last decade, with greater emphasis being placed on rubber impression materials than on dental compound, zinc oxide-eugenol, and agar and alginate. Of particular interest has been the effect of disinfection solutions on the qualities of impressions and the biocompatibility of impression materials. The principal advance in hydrocolloids has been the introduction of the agar/alginate impression technique, which has simplified the procedure and improved the quality of gypsum dies compared with those prepared in alginate impressions. The tear strength of some alginates has been improved, and some have been formulated so that the powder is dustless, thus reducing the health hazard as a result of patient inhalation of dust during the dispensing process. Polyether and silicone impression materials have been modified so that the working time, viscosity, and flexibility of the polyethers have been improved and, with the introduction of addition silicones, their accuracy has become exceptional. Although the early addition silicones liberated hydrogen after setting, thus delaying the pouring of models and dies, most addition silicones have been improved so that no hydrogen is released and dies can be poured immediately. The introduction of automatic mixing systems for addition silicones has simplified their manipulation, has reduced the number of voids in impressions, and has reduced the amount of material wasted. The incorporation of surfactants into addition silicones has made them hydrophilic, with wetting properties similar to those of polyethers, and has made pouring bubble-free gypsum dies easier. This review is confined to published and unpublished information of the past decade. It will also suggest trends that should be anticipated in the near future based on this information. The review will not present information developed before 1975, which is available in several textbooks on dental materials by Craig (1985a), Phillips (1982), and Williams and Cunningham (1979). RIGID IMPRESSION MATERIALS IMPRESSION COMPOUND The use of dental tray compound has decreased with the increased substitution of acrylic tray materials. The application of dental impression compound has also decreased with the increased use of rubber impression materials, which can also be electroformed to produce metal dies. However, impression compound is useful for checking cavity preparations for undercuts and for making impressions of full crown preparations where gingival tissues must be displaced. Excessive temperature rise of the pulp chamber is undesirable, and Grajower et al. (1975) recently measured temperature increases in the pulp when

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Section: Techniquesmentioning

confidence: 99%