After these steps, the specimens were submitted to different situations: 1. Introduction . Glutaraldehyde solutions are recommended for disinfection. The did a PubMed search between 1980 and 2005 on the effect of chemical disinfection, by immersions or spraying, on the impression’s dimensional changes. Impression materials for preliminary impressions 19 3.5. Effect of disinfection on dental impression materials is con-troversial. However, the method of disinfection should be verified with the material manufacturer to prevent distortion of the impression or loosening of the adhesive bond between the impression tray and the impression material. However, it has been shown that washing impression materials with water alone removes as little as 40% of bacteria, viruses and fungi5 and therefore is totally inadequate as a means to reduce potential infection Introduction erials, and dental laboratories are exposed to different types of pathogenic microorganisms. Phenols with a high alcohol content, for example, can desiccate some impression materials. They stated that there were variations in the “disinfection” of dental impressions [4]. The aim of this study was to investigate the effect of three different types of disinfectant agents on alginate impression material after 5 and 10 minutes. of alginate impression material, preparing the mouth, making the impression, removal/inspection of the impression, and storage and disinfection. Follow the manufacturer’s instructions . Keywords: Disinfection materials, alginate impression, spray method 1. Disinfection. c/o Department of Prosthodon cs, School of Oral Health Sciences, University of the Witwatersrand, Johannesburg. addition silicone impression material whereas spraying with chlorine compound was advocated for disinfection of polyether impression material for 2-3 min.35 UV rays can be used for disinfection of water supplies, laboratory equipment, dental headpieces, dental impression and implants. impression material. Fabrication of the stone model 46 10.1. After disinfection, rinse impression well … Immediate measurement of the dry material and at 10 and 20 minutes after maintenance on the … SCIENTIFIC Disinfection of irreversible hydrocolloid impression material with chlorinated compounds SADJ June 2009, Vol 64 no 5 p208 - p212 I H Rweyendela: BDS, MScDent. Mechanical mixing of alginate ensures that Selection of impression tray alginate mix is the same each time they are mixed. In an in-vitro study Lu JX et al.11 found no dimension deformation on the Silicone rubber, Irreversible spatulation. Major 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. Most of the studies on impression disinfection focused on the dimen-sional changes and surface details3,10,14,15. The efficiency of disinfection methods and their adverse effects on the materials are being evaluated since 19743. Of particular interest has been the effect of disinfection solutions on the In this in vitro experimental study, 66 circular samples of alginate impression material were contaminated with Staphylococcus aureus, Pseudomonas aeruginosa, and Candida albicans fungus. Impression materials, impression trays, and poured stone cast have been said to be the main source of cross infection between patients and dentists [1]. impression materials have been standards for definitive edentulous impressions. Both impression and base were rinsed in running water for 15 seconds and air-dried. ZOE and compound impressions Material incompatibilities and impression disposal 20 3.6. In one study, while comparing UV rays disinfection with In 2008, Kotsiomiti et al. All commercial water-based disinfectants indicated for dental impression materials can be used. Method and Materials . Because of their material proprieties and handling ... dental– stone interactions, disinfection properties and consequences, dimensional stability, shelf life, color, odor, taste, availability, and clean-up characteristics may contribute to material selection. Storage of the impression and transport to the dental lab 45 10. 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