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Risk of disease transmission in dentistry

Dental personnel is constantly exposed to a wide variety of microorganisms. Potentially hazardous pathogenic microorganisms include: e.g. HBV, HCV, HIV, staphylococci, streptococci, mycobacterium tuberculosis, herpes simplex virus etc. People working in dentistry have the highest risk of contracting corona (Peng et al., 2020).

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Aerosol reduction by means of an intraoral spray mist suction – first findings from an experimental pilot study

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From Spray Mist to Aerosols

  • The use of high-speed instruments and powder jet handpieces generates spray mist
  • Spray mist is a mixture of cooling water, particles, powder, splashes, droplets of different sizes, saliva, blood and microorganisms
  • If the spray mist is not correctly aspirated within the patient's mouth, an aerosol cloud will be formed, which spreads over a radius of several meters

    The risk

    • Over 600 different types of bacteria can be detected in the human oral cavity *
    • 1 ml of saliva contains about 100 million bacteria *
    • During a 15-minute treatment without protective measures, 0.014 µl - 0.12 µl saliva is inhaled via the aerosol **
    • High risk of infection for patients due to cross contaminations

     

    *Source: Genome Research (2009), DOI: 10.1101/gr.084616.108
    **Source: Bennet et al. British Dental Journal, Vol. 189 No. 12 (2000))



    The solution

    • Intraoral high-performance spray mist suction with 300 l/min for up to 100% aerosol reduction*
    • An intraorally applied flow rate of 300 l/min is the most important factor
    • To achieve this, a large suction cannula must be used
    • Optimal suction technique directly at the treatment area improves the effect

     

    *Measurement results from internal study, September 2020, Dürr Dental


    Aerosol prevention depending on the flow rate at the cannula

    *The S-curve shown was graphically (not mathematically) laid through the measuring points to ensure a better visibility of the result. Measurement results from internal study, September 2020, Dürr Dental

    This is what counts:

    • A suction volume of less than 300 l/min is too low to prevent the formation of aerosols (see red area above)
    • Above 300 l/min no more particles could be measured -> a flow rate of  >300 l/min is the key to avoid aerosols (see green area above)
    • Optimal suction technique improves the effect

    Our recommendation

    High Performance Spray Mist Suction systems

    Mobile Spray Mist Suction unit

    Mobile Spray Mist Suction unit

    Large suction cannulas for a maximum suction volume

    Large suction cannulas for a maximum suction volume


    This is what counts

    • High suction volume of >300 l/min at suction handpiece
    • Robust suction engines for reliable function in continuous operation
    • Working with a large suction cannula with secondary air inlets for maximum suction volume at the cannula
    • Working with a saliva ejector only or venturi system (volume flow < 200 l/min) is not sufficient to reduce aerosols*

     

    *Measurement results from internal study, September 2020, Dürr Dental


    Aerosol prevention through intraoral spray mist suction with 300 l/min


    Best protection for the practice team



    Find all information in our free whitepaper:

    Aerosol reduction by means of an intraoral spray mist suction – first findings from an experimental pilot study

    Free whitepaper

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