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Infection Prevention in Dentistry

martie 9, 2015

The dental practice is a high risk of disease transmission. That is why, infection prevention and control is an important part of safe patient care. Concerns about the possible spread of blood-born diseases, and the impact of highly contagious respiratory diseases and other illnesses, require practitioners to establish, evaluate and continually update and monitor their infection prevention and control strategies and protocols.

Three main elements are required in the spread of an infection:

  1. susceptible host
  2. causative agent
  3. mode of transmission

By removing any one of this elements, an infection cannot occur.

Understanding the ways of transmission is necessary for designing and implementing effective prevention and control strategies. In the dental office, the three main ways of transmission of micro-organisms are:

  1. direct transmission – direct physical contact with blood, oral fluids or other materials
  2. indirect transmission – contact with an intermediate contaminated object, such as a dental instrument, equipment or an environmental surface
  3. droplet transmission – contact of oral, nasal or conjunctival mucosa with droplets, spatter or spray containing micro-organisms generated from an infected person, by coughing, sneezing or talking

There are certain universal precautions which represent the strating point for the dentist in infection control in the dental office.They are the following:

  1. The concept that all patients are potentially infected, even when asymptomatic.
  2. The same safe standards of practice should be routinely applied in contact with blood, body fluids and secretions (e.g. saliva), mucous membranes and non-intact skin of every pacient.
  3. Perform a risk assessment before each interaction with the patient in order to determine the interventions that are required to prevent the transmission.
  4. Hand hygiene is the single most important measure for preventing the transmission of micro-organisms.
  5. Always use personal protective equipment and protective clothing.

dental clinic Timisoara

A pacient’s medical history must be performed for everyone that enters the dental office for the first time,  and that information has to be updated from time to time. The medical questionnaire and the discussion with the pacient should not be missed from the standard protocol of the dental office.

The discovery of a pacient with infection must be followed by a predeterminated protocol. It is unethical to refuse an infected pacient in order to avoid the exposure of the doctor. Reducing the extent of contamination of the dental interventions can be achieved partly by the use of rubber dam, pre-procedural antiseptic mouthrinses, high volume evacuation and correct patient positioning. Rubber dam minimises the spread of blood or saliva. When rubber dam is not applied, high volume aspiration becomes essential.

Any instruments placed into the contaminated zone for a treatment session but not used during that session must be regarded as contaminated. For this reason all bulk supplies such as opened boxes of gloves, cotton rolls or gauzes must be stored outside the contaminated zone and protected from contamination from splashes and aerosols. For equipment that is difficult to clean, a protective covering such as a plastic wrap may be necessary.

Dental prostheses and appliances, as well as items used in their fabrication (e.g. impressions, occlusion rims, bite registrations), are potential sources for cross-contamination. Impressions, prostheses or appliances should be cleaned and disinfected as soon as possible after removal from the patient’s mouth, before drying of blood or other organic debris.

Effective communication and coordination between the dental office and the dental laboratory will ensure that:

  1. appropriate cleaning and disinfection procedures are performed in the dental office or the dental laboratory;
  2. materials are not damaged or distorted because of overexposure to disinfectants;
  3. disinfection procedures are not unnecessarily duplicated.

The contaminated items must be sent to the dental laboratory with a red label.

All instruments must be properly cleaned, rinsed and dried prior to either disinfection or sterilization. This step is essential, as residual organic debris will compromise the disinfection and sterilization process.

The sterilization section of the processing area should include the sterilizer and related supplies, with adequate space for loading, unloading and cool down. The area may also include biological indicators and incubators for conducting spore tests, as well as enclosed storage for sterile and single-use disposable items.

The sterilization can be achieved by steam under pressure at 121° C for 15 minutes (autoclaving) or by dry heat at 170°C for 60 minutes.

The term “hand hygiene” has replaced handwashing and includes the use of plain or antimicrobial soap with running water, as well as alcohol-based hand rub. Hand hygiene will be performed at the beginning of the day, after every patient and at the end of the day.

When using soap and water for routine care:

  1. Wet hands with warm, not hot, water.
  2. Apply adequate amount of soap.
  3. Rub vigorously for a minimum of 15 seconds, covering all surfaces of hands and fingers. Pay particular attention to finger tips, between fingers, backs of hands and base of thumbs, which are the most commonly missed areas.
  4. Rinse well with running water.
  5. Dry thoroughly with a disposable paper towel. Turn off taps with towel and discard towel in a bin.

It is also recommended that the doctor keeps their fingernails short and clean and avoid wearing any jewelery.

The protection of the operating team is mandatory. It is achieved by the use of personal protective equipment to shield their own tissues from exposure to potentially infectious material and also by immunization.

Additional protective barriers and techniques should be employed to shield patients from potentially infectious material.

Patients should be provided with protective eyewear to shield their eyes from spatter and debris created during dental procedures. Protective eyewear should be worn throughout the dental appointment, then cleaned and disinfected after use.

The personal protective equipment includes:

  1. Protective clothing
  2. Protective eyewear
  3. Gloves
  4. Masks

The protective clothing can be made from a variety of materials and it must withstand to wash over 60°, temperature at which the viruses are destroyed.

The protective clothing should not be washed with the rest of the normal clothes.

It is the dentist’s responsibility to develop a policy that uniforms and scrubs worn during patient care procedures should not be worn outside the dental office.

The conjunctival mucosa should be protected from spatter and debris created during dental procedures by wearing appropriate eyewear or face shields.

Gloves are worn to protect the hands from contamination. Since gloves are not completely free from leaks and may tear, their use does not replace the need for hand hygiene. Therefore, effective hand hygiene protocols should be followed before donning gloves and after removing them.

In the dental office:

  1. Gloves must be worn when contact with mucous membranes, non-intact skin or body fluids is anticipated.
  2. The same pair of gloves must not be used for more than one patient.
  3. Gloves should be put on immediately before the activity for which they are indicated.
  4. Gloves must be removed and discarded immediately after the activity for which they were used, and hand hygiene must be performed.
  5. Gloves should not be worn outside any room or area where they are required for personal protection.
  6. Gloves must not be washed and reused.
  7. Double-gloving may be utilized for some specific procedures, which may involve the handling of multiple sharp instruments or during longer appointments. However, if used, double-gloving should be procedure-specific, not patient-specific. This would be in keeping with human rights considerations.

Appropriate masks that cover the nose and mouth should be worn during dental procedures to protect the respiratory mucosa from contact with potentially contaminated droplet material. Masks lose efficiency over time, as they become moist from breathing. Accordingly, masks should be changed when they become contaminated, wet or more often, such as during longer appointments.

All these procedures have the purpose to avoid contamination of the pacient, the doctor and the rest of the medical staff.

Stay safe, remain healthy!

Bogdan Fondrea & Denisa Sava – www.dentaldesign.ro

Posted in Bogdan Fondrea, denisa sava, dental clinic, dental clinic timisoara, dental infection, dental sterilisation, dentists in romania, health risks in dentistry
Cel mai frumos cadou de 8 Martie
How to Keep Your Teeth Healthy

Autor: dr. Fondrea

Sunt Bogdan Fondrea, medic dentist pasionat de Estetica Dentara, atestat in Implantologie Orala, fondator al Clinicii Dental Design din Timisoara. Pentru mine, stomatologia nu este o simpla meserie, este o pasiune, un scop bine definit care tine de urmarea propriului drum, de atentia indreptata spre pacient. Conform unui scriitor francez, Luc de Clapiers, “Perfectiunea unei pendule nu este de a merge repede, ci regulat”. Cred ca este foarte important sa cautam, in mod constant, sa ne perfectionam, sa facem ceea ce ne place si, foarte important, sa o facem intr-un mod profesionist. Un medic are datoria sa faca tot ce ii sta in putere sa salveze, sa trateze, sa informeze, dar, mai ales, sa previna. La urma urmei, nu clestele scoate dinti si nici antibioticele nu salveaza dinti.

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