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The c/o Department of Prosthodon cs, School of Oral Health Sciences, University of the Witwatersrand, Johannesburg. The efficiency of disinfection methods and their adverse effects on the materials are being evaluated since 19743. SCIENTIFIC Disinfection of irreversible hydrocolloid impression material with chlorinated compounds SADJ June 2009, Vol 64 no 5 p208 - p212 I H Rweyendela: BDS, MScDent. Phenols with a high alcohol content, for example, can desiccate some impression materials. After these steps, the specimens were submitted to different situations: 1. After disinfection, rinse impression well … 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. Follow the manufacturer’s instructions . In one study, while comparing UV rays disinfection with Introduction erials, and dental laboratories are exposed to different types of pathogenic microorganisms. Mechanical mixing of alginate ensures that Selection of impression tray alginate mix is the same each time they are mixed. Storage of the impression and transport to the dental lab 45 10. of alginate impression material, preparing the mouth, making the impression, removal/inspection of the impression, and storage and disinfection. They stated that there were variations in the spatulation. impression materials have been standards for definitive edentulous impressions. In this in vitro experimental study, 66 circular samples of alginate impression material were contaminated with Staphylococcus aureus, Pseudomonas aeruginosa, and Candida albicans fungus. Method and Materials . did a PubMed search between 1980 and 2005 on the effect of chemical disinfection, by immersions or spraying, on the impression’s dimensional changes. 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. 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 Disinfection. All commercial water-based disinfectants indicated for dental impression materials can be used. Glutaraldehyde solutions are recommended for disinfection. Material incompatibilities and impression disposal 20 3.6. Introduction . Impression materials for preliminary impressions 19 3.5. for use, time, and level of disinfection required. Effect of disinfection on dental impression materials is con-troversial. In an in-vitro study Lu JX et al.11 found no dimension deformation on the Silicone rubber, Irreversible 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. Overview of material types and consistencies according to ISO 4823:2000 21 ... Disinfection 44 9. Fabrication of the stone model 46 10.1. Most of the studies on impression disinfection focused on the dimen-sional changes and surface details3,10,14,15. Immediate measurement of the dry material and at 10 and 20 minutes after maintenance on the … In 2008, Kotsiomiti et al. impression material. 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. ZOE and compound impressions Impression materials, impression trays, and poured stone cast have been said to be the main source of cross infection between patients and dentists [1]. Of particular interest has been the effect of disinfection solutions on the “disinfection” of dental impressions [4]. 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. Both impression and base were rinsed in running water for 15 seconds and air-dried. Keywords: Disinfection materials, alginate impression, spray method 1. 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