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Infection Control

What is the appropriate disinfection technique for impressions?

This question was submitted by a general dentist: What is the appropriate disinfection technique for impressions?

Dr. Nita Mazurat, representing the Organization for Safety, Asepsis, and Prevention (OSAP) has provided this quick initial response

ImpressionsCleaning and disinfecting impressions before pouring in stone is an important aspect of laboratory asepsis. Different materials require different handling techniques.

In general, impressions should be rinsed under running water and/or gently scrubbed with a camel hair brush (i.e., artists brush, one-half inch bristle) and a liquid detergent under running water to remove bioburden. Scrubbing gently with dental stone sprinkled into the impression will remove stubborn materials. Always consult the impression material manufacturer or instructions for use for advice on using compatible disinfectants. Hydrocolloid and polyether impression materials generally are sprayed to saturate for the required time with an intermediate level disinfectant and placed in a plastic bag or sealed container to prevent evaporation of the agent. More stable silicone (vinyl polysiloxane) or rubber-based impression material typically may be immersed for disinfection.  A commonly used disinfectant for impressions is sodium hypochlorite 5.25% diluted 1:10, mixed daily with exposure for 10 minutes. 


Do you need further information on this topic? Do you have any comments or suggestions? Email us at oasisdiscussions@cda-adc.ca

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  1. Varun Nischal February 24, 2019

    Are alcohol based disinfectants good enough to carry out complete disinfection of the intraoral impressions?

  2. Robert June 1, 2020

    Nice Information

  3. Varun June 1, 2020

    They use alcohol to disinfect the impressions at the Toronto dental school. Is the use justified?


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