Impression materials and virus

Article Abstract:

One current focus of research in dentistry is the proper disinfection of dental impression materials (materials used to form models of the mouth) to prevent viral contamination. This was studied by exposing six impression materials (which are listed) to a herpesvirus; the impressions were mixed and seated onto metal models of an upper jaw arch to which a small amount of the virus had been applied. After setting, the impressions were removed and treated in one of four ways: they sat for five minutes, and were then washed twice with culture medium (in which herpesvirus grows); they were rinsed immediately in tap water for five seconds, then sat for five minutes before being washed with culture medium; they sat for five minutes, then had superficial layers sliced off with a scalpel into culture medium; or, they sat for five minutes and were rinsed in tap water for five seconds before layers were sliced off and placed in culture medium. The amount of virus grown in culture medium was a measure of the absorption and retention of virus by the impression material. Results showed that virus was recovered from all six materials with the possible exception of Reprosil. Impregum, Permlastic, Surgident, and Jeltrate seemed to harbor virus that could be transmitted to dental personnel. Different amounts of virus were recovered from the different impression materials depending on the method of recovery; for example, although immediate rinsing in tap water followed by a five-minute rest led to recovery of virus from three materials, no viruses were recovered from the other three. A discussion of these results is presented. Rinsing in tap water significantly reduced the quantities of, or eliminated, virus recovery; however, saliva or blood (which were not present) would make removal of virus more difficult. Materials that adsorbed virus (i.e. where the virus adhered to the surface) were easier to rinse and disinfect than those that absorbed virus. (Consumer Summary produced by Reliance Medical Information, Inc.)

Methods, Usage, Disease transmission, Viruses, Maintenance and repair, Disinfection and disinfectants, Disinfectants, Disinfection, Sterilization (Disinfection), Sterilization

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Direct and indirect restorative materials

Article Abstract:

The advantages and disadvantages of all materials used to repair teeth are reviewed to allow dentists to pass this information on to their patients. Materials include amalgam, resin-based composites, glass ionomer, resin-modified glass ionomer, porcelain, metal-ceramic, cast gold alloys, and base metal alloys. Topics include principal uses, leakage and recurrent decay, durability, clinical considerations, resistance to wear and fracture, biocompatibility, esthetics, cost, and number of visits to complete the treatment.

Evaluation, Dental matrices

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The spectrum of composites: new techniques and materials

Article Abstract:

Advances in composite-based resins are discussed. Topics include the classification of composite-based resins, flowable resins, packable resins, techniques for placing the material, and the polymerization of resin-based composites.

Analysis, Dental resins

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