A study by researchers at Imperial College London and King’s College London measured and analysed the generation of aerosols during dental procedures. (Image: Imperial College London/King’s College London)
LONDON, UK: Dental procedures were flagged early on in the SARS-CoV-2 pandemic as posing a high risk for the spread of the virus. The strict infection control measures in place at dental clinics have helped to prevent the spread of the virus in dental settings; however, researchers from Imperial College London and King’s College London have found that careful selection and operation of dental drills could lower the risk of transmission even further.
Researchers at the universities measured and analysed the generation of aerosols during dental procedures and suggested changes in the use of dental drills in order to prevent transmission of SARS-CoV-2 and contamination in dental clinics.
According to a joint press release, the suggestions include carefully selecting and controlling the rotation speeds of drills that only use water as a coolant, and avoiding the use of dental drills that use a mixture of water and air as abrasion coolants. The study identified parameters that would allow dental procedures such as tooth reconstructions to be carried out with 60 times fewer aerosol droplets being produced.
The researchers found that using air turbine drill types—the most common type of dental drill—creates dense clouds of aerosol droplets that spread as fast as 12 m/s and can quickly contaminate an entire treatment room. Just 1 ml of saliva from infected patients contains up to 120 million copies of the virus, each having the capacity to infect.
Images of “the spray formed by an air turbine unobstructed running in a steady state (A), the probability distribution of the spray droplet concentration based on >2000 images (B) and its standard deviation (C). For interpretation in (B) pixels that are red indicated a 100% chance of encountering a droplet at any point in time, pixels that are black 0%. In (C) standard deviation is plotted on an equivalent scale.” (Image: Imperial College London/King’s College London)
They tested a high-torque electric micromotor drill both with and without the use of water and air streams. They found that using this type of drill without air streams at speeds lower than 100,000 rpm produced 60 times fewer droplets than air turbine drill types did. In addition to factors such as the positioning of the patient and the presence of ventilation systems, they found that the type of cutting instrument and the amount and type of cooling water being used affected the spread of aerosol concentration in treatment rooms.
The researchers pointed out that the fallow time required between dental treatments limits patient access and commented that the study could help dentists to understand how to reduce the amount of aerosol that is being generated, potentially allowing them to treat more patients.
“This important work describes the basic mechanisms that lead to the features of dental aerosols that we currently consider to be high risk,” Prof. Owen Addison of King’s College London’s Faculty of Dentistry, Oral and Craniofacial Sciences, co-author of the study, was quoted as saying. “This has enabled us to choose drill parameters to keep our patients and the dental team safe at this difficult time. Although we cannot provide every procedure, because slowing our drills is much less efficient, we now have the basis to do more than we have done in the last six months.”
Addison added: “Because of the COVID-19 pandemic, dentistry has become a high-risk practice—but the need for treatments hasn’t gone away. Our suggestions could help begin to open up dentistry to patients once again.”
BALTIMORE, US: Engineering students at Johns Hopkins University in Baltimore have collaborated with a Florida dentist to develop a prototype device that ...
KRIENS, Switzerland: During the ongoing COVID-19 crisis, the dental profession forms one of the most threatened groups. Close contact with patients, ...
NEW DELHI, India: New regulations for the dental profession in India will mean that all BDS graduates will have to pass a dental National Exit Test ...
PORTLAND, Ore., U.S.: A recent study has found that a compound used to make car bumpers more robust and protect wood decks could make dental fillings last ...
NYON, Switzerland: Guided Biofilm Therapy (GBT), developed by EMS together with clinicians and academics, is a systematic, evidence-based modular protocol ...
BRISBANE, Australia: Dental professionals and researchers continue to look for the best solutions to help prevent and manage peri-implant disease. For ...
MOSCOW, Russia: Researchers from Austria, Germany and Russia have collaborated in successfully using lithography-based ceramic manufacturing (LCM), a form ...
XI’AN, China: Dental implantology is no longer just about milling. Technological leaps in additive manufacturing have hastened both the pace at which ...
NEW YORK, U.S.: The daily routine to avoid cross-infection in the dental office is never ending. However, the consequences of an outbreak are even worse, ...
Education
Live webinar Thu. 18 July 2024 8:00 pm EST (New York)
For decades, dentists around the world have profited from high demand for dental clinics by selling to a dental support organisation (DSO), entering ...
Aligner orthodontics is one of the fastest-growing areas of cosmetic dental treatment. To broadly assess patient satisfaction with aligner therapy, a team ...
Broken file management is one of the most challenging parts of endodontic treatment. Regardless of whether the clinician is faced with a retreatment ...
To post a reply please login or register