Indoor Air Quality Assurance In A Dental Environment.Dental.presentation ( october 2012) by somamedical.net
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Fundamental Principle Of Dental I.A.Q.( Indoor Air Quality).Environmental SurfacesContaminated patient care items and surfaces pose different degrees of risk for infectiontransmission based on their location and potential to transmit pathogens. With regard toenvironmental surfaces, the latest precautionary dental guidelines also provide a betterunderstanding of how to discriminate between the two categories of environmentalsurfaces: clinical contact surfaces and housekeeping surfacesCategories of Contaminated Environmental SurfacesCategory Definition ExamplesClinical contact Surfaces that are directly Dental unit surfaces, laboratory contacted by contaminated equipment, reusable containers of instruments, devices, hands, dental materials, drawer handles, or gloves heavily used countertops, pens, telephone handles, doorknobsHousekeeping Surfaces that require regular Floors, walls, lightly used cleaning to remove soil and countertops dust but that rarely contact dental personnel or patients
Environmental Decontamination In Dentistry“A high level of general cleanliness must be maintained in dental surgery.Working surfaces, bracket tables and countertops should be disinfected. Theuse of sterilize-able trays or disposables are recommended. Floors, walls andsinks must be routinely cleaned. All spilt blood or body fluids must beattended to immediately.“The phrase “risk of aerosols contamination“ means :1. “General cleanliness”, “routinely cleaned” are not enough.2. “Spilt blood and body fluids” might not be attended too immediately.3. Aerosol dispersal is not completely prevented by Using high-volume suction and dental dam.4. How many of dental clinics follow the exact IAQ preventive instructions?5. Air conditioners make the air dryer (higher risk of droplet nuclei formation because of fluctuating humidity levels)
Why is I.A.Q important in a dental environment?The execution of dental work and the use of various chemical compounds leads toexposure levels for dentists, staff and patients to a range of potentially harmful airbornecontaminants. Especially for dental staff this exposure to potentially harmful air pollutantscan be significantly higher than that of individuals in most indoor environments.MicroorganismsThe use of high-speed drills and ultrasonic scaling equipment generates fine droplets whichare light enough to stay airborne for hours. Bacteria and viruses, which are contained inthese micro-droplets, are easily inhaled and constitute a potential source of infection.MercuryNumerous studies show that dentists and their staff have higher than average levels ofinorganic mercury (Hg) in their blood and urine. Mercury vapours can be released by theplacement and the removal of amalgam fillings. They may also be released from indoorsurfaces, where they may have accumulated over years of usage.DisinfectantsChemical disinfectants in a dental environment are responsible for a generally unpleasantodour. Some disinfectants may also cause irritation and may have a sensitising potentialespecially for staff.
Journal- ExtractIndoor air quality in a dentistry clinic.Helmis CG, Tzoutzas J, Flocas HA, Halios CH, Stathopoulou OI, Assimakopoulos VD, Panis V, Apostolatou M, SgourosG, Adam E.SourceDivision of Applied Physics, Department of Physics, University of Athens, University Campus, Build.Phys-5, Athens 157 84,Greece. email@example.com <firstname.lastname@example.org>AbstractThe purpose of this work is to assess, both experimentally and theoretically the status of air quality in a dentistry clinic of theAthens University Dentistry Faculty with respect to chemical pollutants and identify the indoor sources associated with dentalactivities. Total VOCs, CO(2), PM(10), PM(2.5), NO(x) and SO(2) were measured over a period of approximately three monthsin a selected dentistry clinic. High pollution levels during the operation hours regarding CO(2), total VOCs andParticulate Matter were found, while in the non-working periods lower levels were recorded. On the contrary, NO(x) andSO(2) remained at low levels for the whole experimental period. These conditions were associated with the number ofoccupants, the nature of the dental clinical procedures, the materials used and the ventilation schemes, which lead tohigh concentrations, far above the limits that are set by international organizations and concern human exposure. The indoorenvironmental conditions were investigated using the Computational Fluid Dynamics (CFD) model PHOENICS for inert gasessimulation. The results revealed diagonal temperature stratification and low air velocities leading to pollution stratification,accompanied by accumulation of inert gaseous species in certain areas of the room. Different schemes of natural ventilationwere also applied in order to examine their effect on the indoor comfort conditions for the occupants, in terms of air renewal anddouble cross ventilation was found to be most effective. The relative contribution of the indoor sources, which are mainlyassociated with indoor activities, was assessed by application of the Multi Chamber Indoor Air Quality Model (MIAQ) to theexperimental data. It was found that deposition onto indoor surfaces is an important removal mechanism while a greatamount of particulate matter emitted in the Clinic burdened severely the indoor air quality. The natural ventilation of theroom seemed to reduce the levels of the fine particles. The emission rates for the fine and coarse particulates were found to bealmost equal, while the coarse particles were found susceptible to deposition onto indoor surfaces.PMID: 17434576 [PubMed - indexed for MEDLINE]
The Dental I.A.Q. SolutionsTemporary Solutions:Using of disinfectants on surfaces. (Timeconsuming and costly )Long-lasting preventive solutions :Slow releasing active chemicals (TitaniumDioxide, TiO2), air filters, UV-C light andnegative ions.
So what is IAQ ?Indoor Air Quality as defined by OSHA Malaysia,OSHA Singapore and ASHRAE standard 62-1989.“Wherein it is stated that air in which there are no known contaminants at harmfulconcentrations”. So quality air is always related to fresh air.
3 main causes of IAQ problems • Source of contamination • Susceptible occupants• Mechanism transport of contaminants
Type of IAQ contaminantsGases Volatile Organic Compounds (V.O.C). Potential VOC’s come from gases of building furnishings i.e. carpets, furniture etc. and life cycle byproducts of micro-organism that lives in the building (or its HVAC system). Aldehyde vapors are typical byproducts of both off gassing and chemical processes, that occur inside or outside the building.Particles Mostly counted in the diameter range from 0.1 micron or greater. Bio-aerosol are defined as airborne particles, which are living organisms, spores and fragments of organisms released from living organisms. These include pathogens (disease causing viruses), fungi (mold) and bacteria.
What I.A.Q problems should we be concerned about?1. How can people eject flu viruses into the air.2. What different forms can airborne viruses take.3. How far can those viruses travel & how can they circulate within buildings and inside their HVAC units.4. What conditions increase airborne flu virus survival.5. What systems are available to sterilize, capture and/or kill airborne flu viruses.
Airborne transmission depends on people tolaunch viruses into the air. People can shed this many flu virus into the air:1. Coughing 3,000+2. Sneezing 3,000+3. Breathing 200+ natural sterilization , nose hair & mucus.4. Talking/Singing 1,000+5. Vomiting 1,000+6. Diarrhea *20,000+
How far can Airborne Viruses Travel? Large/Small Droplets Droplet Nuclei1. Coughing 1-5 feet 160+ feet2. Sneezing 8-15 feet 160+ feet3. Singing, Talking 1-3 feet 160+ feet4. Mouth Breathing 1-3 feet 160+ feet5. Diarrhea* 5 feet+ 160+ feet *As a result of toilet water aerosolization, air contamination in toilets need to be effectively sterilized and contained.
Stages of Infectious Droplets & Droplet Nuclei
Optimum HumidityFor optimum air quality, Indoor Relative Humidity should always bemaintained between 40% and 60%!
Low indoor humidity increases Droplet Nuclei Levels• Viruses evaporate faster in low humidity levels thus creating More Droplet Nuclei.• Low humidity allows droplet nuclei to stay airborne longer as the droplets do not absorb water weight which would cause them to fall to the ground.• Indoor Air currents both created by HVAC systems and people movement assure that droplet nuclei will remain airborne Indefinitely.• This allows HVAC systems to remove and redistribute droplet nuclei throughout the building to infect more occupants.
So, is there a solution to resolve I.A.Q.A problem?
Yes!According to Environmental Protection Agency These are the recommended technologies According to EPA guidelines… 1. MERV (Minimum Efficiency Reporting Value) Rated Filters (H.E.P.A) 2. Germicidal UV Lights (UV-C) 3. Magnetized Air Media Filtration (ELECTROSTATIC FILTERS) 4. Bi-Polar Ionization (GERMICIDAL MEDICAL LAMP) 5. Photo-Catalytic Oxidation (NANO TiO2)
So in essence, if we follow all five sterilization recommended by EPA, we would effectively have a 24/7 sterilization solution protocol MERV UVC 24/7 IAQA solution Bi-polar Photo- Ionization Protocol catalyst Electrostatic filter
Lets explore and understand each ofthe 5 technologies recommended by Environmental Protection Agency (EPA)
1. MERV (Minimum Efficiency Reporting Value) Rated Filters (H.E.P.A)• Particulate matter contain pathogens (viruses, bacteria and infectious organisms), allergens and carcinogens.• Mechanical air filters, like High Efficiency Particulate Air (HEPA) filters, remove 99.97% of all airborne particulates of 0.3 microns and above in size.• They trap the particles in filters made out of tightly woven fibers.
2.Germicidal UV Lights (UV-C) How does UV-C Work?• UV-C light emits germicidal wavelengths between 200-300nm. This reacts with the DNA and permanently alters the structure and the molecular bonds of microbiological contaminants such as bacteria, viruses, germs, molds and mildews.
Its scientifically proven that Ultraviolet Germicidallamps (UVC) working at 253.7 nanometers at thecorrect intensity can effectively prevent crosscontamination of the following airborne diseases:- • Aspergillosis Niger • Legionella • SARS • Bacillus Anthracis • Dust Mites • Allergy & Sinusitis • Tuberculosis (TB) • H1N1
3. Magnetized Air Media Filtration (ELECTROSTATIC FILTERS)• Electrostatic air precipitators use a process called electrostatic attraction to trap charged particles.• They draw air through an ionization section where particles obtain an electrical charge.• The charged particles then accumulate on a series of Flat plates called collectors that are oppositely charged.
4. Bi-Polar Ionization (Medilites)• Air ion generators, or ionizers disperse negatively charged ions (anions) into the air, similar to the electronic air cleaners but without a collector plate.• These ions attach to airborne particles, making them heavier and causing them to settle on the ground faster, away from the nasal breathing zone.• Negatively charged oxygen molecules will behave like hydroxyl radicals to neutralize odors and destroy the DNA of pathogens and allergens.• Studies have shown that anions can freshen indoor air, reduce tiredness, relieve stress, alleviate affective depression, reinforce collagen, and strengthen the functions of autonomic nerves and the immune system.
5. Photo-Catalytic Oxidation -NANO Titanium Dioxide (TiO2)• Nano Titanium Dioxide (TiO2) transforms biological and gaseous pollutants into harmless products by a process called photo catalytic oxidation (PCO).• When applied as a coating and exposed to ultra- violet or ambient light, Nano-TiO2 produces hydroxyl radicals and superoxide ions that will neutralize biological and gaseous contaminants in indoor air.
• We now know IAQA problems exist!• We now understand the recommendations by EPA for effective sterilization!• So, what kind of equipments and technologies does Soma Medical have to resolve these IAQA problems?
Benefits• Cost efficient• Long lasting• Low maintenance• Good indoor air quality
The proof is in the pudding!! Our recommended sterilization solution protocol and productscan be effectively tested through a pre and post microbial challenge test, VOC count test and particulate testing
Our equipments used for testing Particle Scanner Negative Ion Tester IAQA VOC Tester
The importance of testing forVolatile organic compounds (VOC)Volatile organic compounds (VOCs) refersto organic chemical compounds which havesignificant vapor pressures and can affect theenvironment and human health.
The importance of testing for negative ionsNegative ions help freshen and purify the air byneutralizing allergens such as pollen, moldspores, dust, and animal dander floating in theair. Negative ions will cause floating particulatesto be attracted and stick to each other, formingclumps, this eventually falls to the ground andthus purifies the air.
The importance of testing for Particulate countParticle counters are used to determine the airquality by counting and sizing the number ofparticles in the air. This information is useful indetermining the concentration and micron size ofparticulates since it has a direct relationship tohuman well being and IAQA.