Introduction:
It is important for dental operators to recognize the risk of aerosol infections and always adhere to strict infection control protocols. The guidelines given by the Centers for Disease Control and Prevention (CDC) outline essential measures for infection prevention and control guidelines to prevent aerosol infections. This article gives an overview of essential guidelines aimed at preventing aerosol-generated infections in dentistry.
How Do Aerosols Cause Infections in Dentists?
Aerosols (smaller airborne particles) and spatter (larger airborne particles) tend to be the most commonly generated particles within an intraoperative setting of the dental clinic. This can especially be seen with the aerosol‐generating procedures (AGPs) according to current dental research and guidelines that have been advocated by dental practitioners or operators within a clinical setting, who may often use high‐speed handpieces and burs commonly in surgical procedures.
Further dental healthcare providers are also at an increased risk of disease transmission because they operate in risky settings that make them in close proximity to patients' blood and salivary fields during dental or oral surgery. Dental practitioners are currently prone to aerosol-generated infections as well as droplet infections (infections that spread through respiratory droplets) ranging from tuberculosis (an infectious disease caused by bacteria that usually affects the lungs.), severe acute respiratory syndrome (SARS), and measles (a viral infection caused by the measles virus). In the wake of the SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) infection variant, it has become mandatory for dental practitioners or operators to protect themselves from the risk of droplet infections or disease transmission related to aerosols and spatter.
Further, despite taking precautionary or preventive measures within the intraoperative clinical or hospital setting, in a lack of caution or by occasional carelessness, dentists would be highly prone to inhaling droplets from patients' oral mucosa, inhalation of the aerosols generated in a clinic or surgical setting, or even the inhalation of fomites on oral or skin mucosa, that may be harboring several pathogenic or infectious micro‐organisms. There are several ways for operators to mitigate and effectively contain or control the spatter and aerosol risks that are generated by high-powered surgical instruments, handpieces, or burs.
At What Distance Do Aerosols Cause Contamination?
In the most common dental clinic or hospital setting where high‐speed instruments like surgical handpieces, aerators, dental burs, or surgical drills are used, aerosols are certainly generated during these procedures. Aerosols and spatters are tiny particles that remain suspended in the air. When the clinical setting is incompletely disinfected or not thoroughly disinfected or patients do not follow the cough etiquette or preprocedural mouth rinse or gargling, this can create complications or pose challenges to the dental or maxillofacial surgeon. This is because aerosols can easily be inhaled, which would be risky to dental operators after the dental procedure is finished.
These aerosols tend to settle on surfaces, away from the surgical field, potentially harboring pathogenic microorganisms, and make way for the transmission of droplet infections through direct or indirect contact with the surfaces of dental clinics or in hospital settings.
Even for asymptomatic patients, it is important for the dental operators or the clinicians to know that the droplets would be generated by these carriers of infection either while not following the cough etiquette correctly or even from the simple acts of coughing, or sneezing.
Current dental research suggests that particles that are less than 5 μm in diameter would tend to be settled only in the near vicinity of the operating area, usually within less than a 1-meter range. Bioaerosols, on the other hand, produced from dental devices and machines, during the AGPs generated would almost remain suspended in the air for longer periods. This is the possible reason why dental research suggests safety for practitioners or operators to protect themselves from the risk of virulent pathogens over the distance reference range of 1.8 to 2 meters, citing potential disease transmission risks.
What Are the CDC Guidelines for the Prevention of Infection in a Clinical Setting?
According to the Centers for Disease Control and Prevention (CDC) infection prevention and control guidelines, the following strategies, with their indicated percentages can be a way to combat the infection chain in a clinical setting:
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Thorough disinfection of surfaces and dental instruments (99.1 percent).
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Use of personal protective equipment (PPE) (85.2 percent).
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Screening patients for COVID-19 and other respiratory infections (98.5 percent).
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Use of suction methods in a clinic or hospital setting (4 percent).
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Use of masks by the dental staff members (99.1 percent).
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Social distancing (98.9 percent).
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Preprocedural mouth rinse use before dental surgery (12 percent).
Dental aerosols are commonly generated during endodontic, periodontal surgical, or restorative treatment modalities or procedures because they involve the use of high‐speed handpieces, ultrasonic scalers, and high‐pressure air syringes.
How Do Preprocedural Mouth Rinses Contribute to Infection Control?
Preprocedural mouth rinses have been considered to be one of the best ways to counteract the chain of infection between operators and patients, according to research findings over the past decade. The use of a potent mouth rinse before dental procedures and even after the procedure by patients could be beneficial in reducing the microbial load of aerosols that would be generated during dental AGPs.
These mouth rinses in question that have been investigated through scientific research range from using chlorhexidine (CHX) mouth rinse, cetylpyridinium chloride (CPC), essential oils or herbal mouthwashes, or boric acid combined with water. In comparison to other mouth rinses, the CHX mouth rinse is usually referred to by dentists as the most effective rinse in controlling infections between the operator and patient.
However, there is limited evidence supporting that the mouth rinses would be beneficial at all or act against any reduction in CFU (colony-forming units) of bacteria as such according to other dental research statements.
Conclusion:
To effectively control the chain of infection in a dental or hospital setting and to further reduce any risk of disease transmission to the operator themselves from patients' possible droplet infections, several clinical measures have been hypothesized by medical and dental researchers, and are currently under investigation for scientific evidence and how effectively dental operators can save themselves from any possible disease transmission even from asymptomatic patients who may be carriers of respiratory or droplet infections. To effectively prevent the aerosols from being suspended in the atmosphere, it is effective to always allow scope for adequate cross ventilation in the dental clinic or rather implement a laminar flow setting. Further, the use of steam heat sterilization is deemed most effective for dental instruments while dry heat sterilization and other disinfectants for the dental operative surfaces and the floor of the clinic or hospital should be adequately implemented or used to prevent aerosol and droplet infections from patients.
