Infection control is one of the most important and non-negotiable aspects of dental assisting. It protects patients from cross-contamination between appointments, protects you and your colleagues from occupational exposure, and is a legal requirement under OSHA standards and the CDC guidelines for dental settings. This guide covers every component of a compliant infection control program.
The foundational principle — Standard Precautions: Treat all patients as potentially infectious for bloodborne and other pathogens at all times, regardless of their known medical history. This approach protects both patients and healthcare workers by removing assumptions and applying consistent safeguards universally.
Personal Protective Equipment (PPE)
Proper PPE is required whenever there is potential for exposure to blood, saliva, or other potentially infectious materials — which is virtually every dental procedure.
Gloves
Changed between every patient. Must be inspected before donning. Torn or punctured gloves require immediate change. Never wash and reuse examination gloves.
Mask
ASTM Level 1 for routine procedures; Level 2 or 3 for aerosol-generating procedures. Changed if wet or after each patient. N95 respirators required for airborne precaution situations.
Eye Protection
Protective eyewear or face shield required during procedures that generate aerosols, splatter, or debris. Must be decontaminated between patients.
Protective Clothing
Clinical gown or lab coat worn in patient care areas. Changed if visibly soiled. Not worn outside the clinical area or taken home for laundering.
Hand hygiene
Hand hygiene is the single most effective infection control measure. Required moments in dentistry:
- Before donning gloves
- After removing gloves
- Before and after patient contact
- After contact with potentially contaminated surfaces or equipment
- Before eating, drinking, applying lip balm, or touching your face
Alcohol-based hand rubs are effective for most situations; soap and water is required when hands are visibly soiled or after contact with C. difficile or certain spore-forming organisms.
Spaulding classification — instrument categories
The Spaulding classification categorizes instruments by their risk of infection transmission and determines the required level of decontamination:
Critical Items
Penetrate soft tissue or bone. Must be sterilized. Examples: scalers, surgical instruments, extraction forceps, burs.
Semi-Critical Items
Contact mucous membranes but don't penetrate tissue. Must be sterilized or high-level disinfected. Examples: mirrors, impression trays, handpieces.
Non-Critical Items
Contact intact skin only. Require low-to-intermediate level disinfection. Examples: blood pressure cuffs, X-ray head, light handles.
Sterilization methods
Steam autoclave (steam under pressure) — most common
The standard sterilization method in most dental offices. Steam at 121°C or 134°C under pressure kills all microorganisms including bacterial spores. Instruments must be cleaned, dried, and packaged before sterilization. Cycle time and temperature depend on the autoclave type and load. Always run with biological and chemical indicators to verify function.
Dry heat oven
Uses high temperature without moisture. Appropriate for instruments that would corrode in steam — certain carbon steel instruments. Longer cycle times required. Less common than steam autoclaves.
Chemical vapor sterilization (chemiclave)
Uses chemical vapor at high temperature. Instruments must be completely dry beforehand. Less common but effective for instruments sensitive to moisture.
Sterilization monitoring — the three types
- Mechanical indicators — the autoclave's own gauges and readouts showing time, temperature, and pressure. Check after every cycle.
- Chemical indicators — strips or tape on packaging that change color when exposed to sterilization conditions. Include in every package. They confirm conditions were reached but do not confirm sterility.
- Biological indicators (spore tests) — most definitive test. Contains bacterial spores that should be killed by proper sterilization. Run weekly at minimum. Send to a monitoring service or incubate in-office. If a spore test fails, take the autoclave out of service and investigate.
Surface disinfection — operatory between patients
All clinical contact surfaces must be either covered with barriers or disinfected between patients. The two-step protocol for non-covered surfaces:
- Clean: Apply an EPA-registered hospital disinfectant and wipe to remove gross contamination. This is the cleaning step — it removes organic material that would otherwise inactivate the disinfectant.
- Disinfect: Apply a fresh application of the disinfectant and allow it to remain wet for the full contact time specified by the manufacturer — typically 1 to 3 minutes. Do not wipe dry before the contact time is complete.
Common surfaces requiring disinfection: light handles, chair controls, bracket table, headrest, evacuation system handles, X-ray equipment.
Sharps safety
- Never recap a used needle by hand — use a one-handed scoop technique or a recapping device
- Dispose of needles, blades, and other sharps in a puncture-resistant sharps container immediately after use
- Never overfill a sharps container beyond the fill line
- If a sharps injury occurs: wash with soap and water immediately, report to the supervising dentist, and follow your office's exposure control plan
The bottom line
Infection control is not optional and it is not variable by convenience or time pressure. Every shortcut is a risk to a patient or to you. Consistent application of standard precautions, proper sterilization protocols, and thorough surface disinfection is what separates a compliant, safe dental practice from one that puts people at risk. Know these protocols, follow them every time, and speak up if you see a lapse.