5.4 Infection Prevention Across Care Settings, Laboratory Asepsis & Employee Health Records
Key Takeaways
Infection prevention applies in the reception area, business office, clinical area, laboratory, and remote or mobile clinics, because microorganisms travel on hands, records, impressions and equipment.
Impressions, bite registrations and appliances are rinsed, disinfected with a compatible intermediate-level disinfectant, rinsed again and labelled before going to the lab, and are disinfected again on return.
Lathe rag wheels and brushes are heat-sterilized or discarded after each case, and fresh pumice is used for every patient's appliance.
Mobile and remote clinics meet the same sterilization monitoring standards, or carry used instruments in closed, rigid, puncture-resistant, labelled containers to a central reprocessing area.
Employee health records hold immunizations, titres, TB screening and exposure reports; they are confidential and kept separate from the general personnel file.
5.4 Infection Prevention Across Care Settings, Laboratory Asepsis & Employee Health Records
Quick Answer: Competency 3.1.1 asks you to explain why infection prevention applies in every setting: the reception and business office, the clinical area, the laboratory, and remote locations and mobile clinics. Competency 3.1.6 covers laboratory equipment and asepsis, and 3.1.4 covers keeping employee health records. Anything that has been in a patient's mouth (impressions, bite registrations, appliances, prostheses) is contaminated until it is cleaned and disinfected, both before it goes to the lab and when it comes back. Mobile and remote clinics must meet the same reprocessing and monitoring standards as a fixed office.
1. Why IPAC Applies Everywhere
Microorganisms do not stay in the operatory. They travel on hands, gloves, charts, impressions, payment terminals, aerosols and contaminated instruments. The chain of infection (section 5.1) can be broken at any of these points. Each area of the practice therefore needs its own written routine.
2. Reception and Business Office
| Risk | Control |
|---|---|
| Patients with coughs, fever or other acute respiratory infection | Screen when booking and on arrival. Post respiratory-etiquette signs. Offer a mask, tissues and hand rub. Seat symptomatic patients apart from others and reschedule elective care |
| High-touch surfaces (counter, pens, payment terminal, door handles, toys, tablets) | Clean regularly with a low-level hospital disinfectant; choose toys and furniture that can be wiped |
| Cross-contamination from clinical staff | Remove gloves, gowns and masks before entering reception or the business office; perform hand hygiene first |
| Paper charts, radiographs and devices moving between areas | Handle with clean hands; never carry records or the appointment tablet with contaminated gloves |
| Biohazards at the front desk | No clinical waste, impressions or instruments in the business area |
3. The Clinical Setting
The clinical area follows the full program described in sections 5.1 to 6.3: Routine Practices, hand hygiene, PPE, barriers, surface disinfection, waterline maintenance, instrument reprocessing and sterilization monitoring. Plan the operatory so that clean and contaminated items never cross, and keep only what is needed for the current patient on the work surfaces.
4. The Dental Laboratory Area
In-office labs and the items exchanged with commercial labs are a common, overlooked route of cross-contamination.
Items leaving the operatory:
- Rinse the impression, bite registration, denture or appliance under running water to remove saliva and blood.
- Disinfect it with an intermediate-level (tuberculocidal) disinfectant that is compatible with the material, for the manufacturer's contact time (section 11.1).
- Rinse again, seal it in a bag and label it as disinfected before it goes to the in-office lab or is packaged for a commercial laboratory.
Items returning from a commercial lab (crowns, dentures, appliances, custom trays) are cleaned and disinfected before try-in, because the clinic cannot verify how they were handled.
Laboratory equipment and supplies:
- Lathe: use fresh pumice and a clean pan liner for each case. Rag wheels and brushes are heat-sterilized or discarded after each patient's appliance. Keep the lathe shield in place, and wear eye protection and a mask.
- Burs, stones and lab handpieces used on items that have been in a patient's mouth are cleaned and heat-sterilized, or discarded, after each patient.
- Model trimmer: keep the water supply running while grinding, clean out slurry daily and wear eye protection. Casts are poured from disinfected impressions.
- Separate lab tools from clinical instruments. Lab knives, spatulas, bowls and articulators are cleaned (and disinfected if contaminated) between cases.
- Chemicals: follow WHMIS labels and SDSs for monomers, gypsum, separating media and disinfectants, and use adequate ventilation.
- Surfaces: treat lab counters as clinical contact surfaces when contaminated items are handled there.
5. Remote Locations and Mobile Clinics
Outreach programs bring dental care to long-term care homes, schools, rural and northern communities and mobile vans. The standard of care does not drop because the setting is temporary.
- Reprocessing plan: either sterilize on site with a portable steam sterilizer (with the same physical, chemical and biological monitoring and logbook), or transport used instruments in closed, rigid, puncture-resistant, leak-proof, labelled containers to a central reprocessing area. Pack enough sterile instrument sets for the planned number of patients.
- Zones: even in a small vehicle or a borrowed room, keep a dirty-to-clean flow, with separate areas for contaminated items and for clean and sterile packs.
- Water: use an independent reservoir with potable or treated water, flush and treat lines as required, and use sterile water or saline for surgical procedures.
- Hand hygiene: alcohol-based hand rub stations wherever sinks are limited, with handwashing available for visibly soiled hands.
- PPE and supplies: bring adequate stock, including masks suited to aerosol-generating procedures, eye protection and utility gloves.
- Waste: transport sharps and biomedical waste according to provincial rules, in approved containers.
- Equipment: portable and hand-held X-ray units must be used according to Safety Code 30 (section 8.1).
6. Immunization and Employee Health Records
Competency 3.1.2.6 (immunization) and 3.1.4 (updating employee health records) protect both staff and patients.
Immunizations commonly recommended for dental health care workers (follow the Canadian Immunization Guide, provincial requirements and office policy):
- Hepatitis B series, with a post-vaccination anti-HBs titre to confirm a response
- Measles, mumps and rubella, and varicella, if not already immune
- Tetanus, diphtheria and pertussis (Tdap), with boosters as recommended
- Influenza every year, and COVID-19 as currently recommended
- Tuberculosis screening at hire where the employer's risk assessment requires it
What the employee health record contains:
- immunization history and serology results (or documented declinations)
- TB screening results
- exposure incident reports (date, mechanism, source assessment, first aid, medical follow-up, PEP and follow-up serology)
- work-related injuries and accommodations
- training records, such as IPAC and WHMIS training (often kept with the health and safety file).
How it is managed:
- The record is confidential and kept separate from the general personnel file. Access is limited to people who need it.
- Update it whenever a new vaccine, titre, exposure or training event occurs, and review it at least yearly.
- Retain records for the period required by provincial occupational health and safety rules. Exposure records may need to be kept long-term.
7. Injury Prevention and the Exposure Control Plan
Every office keeps a written exposure control plan. It sets out:
- engineering controls (safety syringes, sharps containers at point of use, instrument cassettes)
- work practices (one-handed recapping, no hand-to-hand passing of sharps, utility gloves for cleanup)
- the post-exposure protocol: immediate first aid, reporting, medical evaluation within two hours, and follow-up (sections 5.1 and 17.3).
Staff review the plan at hire and at least once a year. Every incident is recorded in the employee health record.
A denture returns from a commercial dental laboratory in a sealed bag. What should be done before it is tried in the patient's mouth?
Steam-sterilize it in the autoclave so that it is handled as a critical item
Rinse it with tap water only, because disinfectants always damage acrylic
Clean and disinfect it, because the office cannot verify how it was handled
Try it in directly, because commercial labs must sterilize every prosthesis
Which practice is correct when an assistant uses a dental lathe to polish a patient's acrylic appliance?
Reuse one pan of pumice all day if it is moistened with disinfectant
Use fresh pumice and a sterilized or new rag wheel for each case
Rinse the rag wheel in water between cases and replace it each week
Remove the lathe shield so the appliance can be seen more clearly
Where should a dental office keep a dental assistant's hepatitis B titre results and sharps-injury reports?
Posted on the staff room board, so that coworkers know who is already immune
In a confidential employee health record, kept separate from the personnel file
In the general personnel file, together with the résumé and performance reviews
In the office WHMIS binder, next to the Safety Data Sheets for each product
Sections you finish are checked off in the contents.