7.2 Personal Protective Equipment (PPE) & OSHA Bloodborne Pathogens Standard

7.2 Personal Protective Equipment (PPE) & OSHA Bloodborne Pathogens Standard

Protecting the dental healthcare team from bloodborne, droplet, and airborne pathogens requires strict adherence to statutory federal regulations and clinical infection prevention guidelines. The Occupational Safety and Health Administration (OSHA) enforces legal standards designed to eliminate workplace exposure risks, while the Centers for Disease Control and Prevention (CDC) provides scientific, evidence-based recommendations for clinical practice. Mastering these standards is essential for every registered dental assistant.

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Evolution of Infection Control: Universal to Standard Precautions

Prior to the 1980s, infection control practices in dentistry varied widely. The emergence of the human immunodeficiency virus (HIV) epidemic prompted a comprehensive overhaul of occupational infection control:

Universal Precautions (1980s)

Introduced by the CDC and codified into law by OSHA in 1991, Universal Precautions established the fundamental rule that all human blood and certain human body fluids visibly contaminated with blood must be treated as known to be infectious for HIV, HBV, and other bloodborne pathogens. However, Universal Precautions did not apply to feces, nasal secretions, sputum, sweat, tears, urine, or saliva unless they contained visible blood.

CDC Standard Precautions (Current Policy)

In 1996 (and reaffirmed in the definitive 2003 and 2016 CDC Guidelines for Infection Control in Dental Health-Care Settings), the CDC expanded Universal Precautions into Standard Precautions. Standard Precautions synthesize the concepts of Universal Precautions and Body Substance Isolation into a single, comprehensive standard of care.

Other Potentially Infectious Materials (OPIM)

In dentistry, saliva has always been classified as OPIM. It is clinically impossible to isolate saliva from microscopic capillary bleeding originating within the gingival sulcus, particularly during dental procedures involving manipulation of periodontal tissues. OPIM also encompasses amniotic fluid, pericardial fluid, peritoneal fluid, pleural fluid, synovial fluid, cerebrospinal fluid, any unfixed human tissue or organ, and cell or tissue cultures containing bloodborne agents.

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The OSHA Bloodborne Pathogens Standard (29 CFR 1910.1030)

Promulgated by the federal government under Title 29 of the Code of Federal Regulations, the OSHA Bloodborne Pathogens Standard (29 CFR 1910.1030) is a legally binding workplace safety regulation. Its purpose is to safeguard employees from occupational exposure to blood and OPIM. The standard establishes strict statutory employer mandates:

The Exposure Control Plan (ECP)

Every dental facility with employees who incur occupational exposure must create and maintain a written, site-specific Exposure Control Plan. Key components include:

• Exposure Determination: A comprehensive listing of all job classifications, duties, and procedures in the practice where occupational exposure may occur (e.g., dental assistants, dental hygienists, dentists, sterilization technicians).
• Methods of Implementation: Detailed policies outlining engineering controls, work practice controls, personal protective equipment, housekeeping schedules, and biohazard waste disposal.
• Annual Review and Update: The ECP must be reviewed and updated at least annually, or whenever technological, procedural, or staffing changes alter occupational exposure risk.
• Frontline Employee Input: The standard mandates that employers document the active solicitation and input of non-managerial clinical employees (such as dental assistants) in identifying, evaluating, and selecting effective engineering controls and safety-engineered sharps devices.

The Hepatitis B Immunization Mandate

Because Hepatitis B represents the most infectious bloodborne hazard in clinical healthcare, OSHA enforces strict vaccination protocols:

1. Employer Expense: The entire hepatitis B vaccination series must be provided at no financial cost to the employee.
2. Timeframe: The vaccination must be made available to all occupationally exposed employees within 10 working days of their initial employment assignment.
3. Post-Vaccination Serologic Titer Testing: Employees must undergo a post-vaccination blood test for antibody to hepatitis B surface antigen (anti-HBs) within 1 to 2 months after completing the final dose of the vaccine series to document successful seroconversion and clinical immunity.
4. The Declination Form: An employee retains the legal right to decline the hepatitis B vaccine. However, if an employee refuses the vaccine, they must sign the official OSHA Hepatitis B Vaccine Declination Form. If an employee initially declines but subsequently decides to accept the vaccination while remaining in an exposed clinical role, the employer must immediately provide the vaccination series free of charge.

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Hierarchy of Occupational Hazard Controls

OSHA dictates that workplace hazards must be systematically addressed using a defined hierarchy of controls, prioritizing structural and mechanical solutions over human behavioral reliance:

[1. Engineering Controls]     ──► Physical devices that isolate or remove the hazard
[2. Work Practice Controls]   ──► Behavioral rules altering HOW tasks are performed
[3. Administrative Controls]  ──► Training, protocols, exposure plans, and policies
[4. Personal Protective Eq.]  ──► Physical barriers worn by the worker (Last line of defense)

Engineering Controls

Engineering controls are mechanical devices, structural hardware, or technological designs that physically isolate, shield, or remove a bloodborne hazard from the clinical environment. Examples in the dental practice include:

• Rigid, puncture-resistant, leak-proof sharps disposal containers.
• Self-sheathing dental anesthetic safety syringes and retractable needles.
• Scalpel handles featuring mechanical blade-ejection devices or retractable guards.
• High-Volume Evacuation (HVE) units and dental dam isolation.
• Automated ultrasonic cleaners and instrument washer-disinfectors equipped with locking lids.

Work Practice Controls

Work practice controls are behavioral protocols and administrative operating rules that reduce the likelihood of exposure by modifying the specific physical manner in which a task is performed:

• The Needle Recapping Protocol: Anesthetic needles must never be recapped using an unshielded two-handed technique. Two-handed recapping where the operator holds the cap in one hand and directs the unsheathed needle toward it is an explicit OSHA violation. Recapping must be executed using either the one-handed scoop technique or a mechanical needle-capping holding device.
• Ban on Operatory Consumption: Eating, drinking, smoking, applying cosmetics or lip balm, and handling contact lenses are strictly prohibited in clinical operatories, instrument processing areas, and laboratories.
• Storage Isolation: Food and beverages must never be stored in refrigerators, freezers, shelves, or countertops where blood, dental impressions, or medications are present.
• Hand Hygiene: Washing hands immediately upon glove removal or following accidental contact with blood or OPIM.
• Minimizing Sharps Passing: Never passing unsheathed needles or exposed scalpel blades directly between team members during four-handed dentistry.

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Post-Exposure Protocol and Management

An occupational exposure incident is defined as a specific percutaneous injury (needlestick, bur laceration, scalpel puncture) or contact of mucous membranes (eyes, nose, mouth) or non-intact skin (chapped, abraded, dermatitis) with blood or OPIM. Dental practices must follow a structured, rapid-response protocol:

[1. Immediate First Aid]
- Percutaneous: Wash thoroughly with soap & warm water (DO NOT squeeze/bleed)
- Mucous Membrane: Flush eyes/mouth with water or saline for 15 MINUTES
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[2. Report Incident Immediately]
- Notify Practice Exposure Control Manager & Supervising Dentist
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[3. Source Patient Protocol]
- Request voluntary consent for confidential HBV, HCV & HIV testing
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[4. Immediate Medical Referral & PEP]
- Refer exposed worker to licensed occupational healthcare provider
- Start HIV PEP as soon as possible (ideally within hours; no later than 72 hours)
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[5. Documentation & Sharps Injury Log]
- Complete confidential exposure report (plus sharps injury log if the office keeps OSHA injury logs)
- Retain medical records for Duration of Employment + 30 YEARS

Immediate First Aid Actions

• Percutaneous Puncture / Cut: Immediately wash the wound thoroughly with warm water and mild soap. Do not squeeze, milk, or pinch the wound, and never apply caustic chemicals, harsh antiseptics, or bleach; irritating the tissue induces local inflammation that increases vascular absorption.
• Splash to Mucous Membranes or Eyes: Irrigate the affected area immediately with copious running water or sterile saline at an emergency eyewash station for a minimum of 15 continuous minutes.

Medical Evaluation and Post-Exposure Prophylaxis (PEP)

The exposed employee must be referred immediately to a qualified healthcare professional or emergency department:

• HIV Post-Exposure Prophylaxis: If indicated, antiretroviral PEP medications should be initiated as rapidly as possible—ideally within 2 hours of exposure, and generally no later than 72 hours—and continued for 28 consecutive days.
• HBV Prophylaxis: For an exposed worker who has not been vaccinated or is a known non-responder, Hepatitis B Immune Globulin (HBIG) and the hepatitis B vaccine series should be initiated within 24 hours.

Documentation and Recordkeeping

The incident must be documented in a confidential exposure report (route of exposure, circumstances, and the type and brand of device). Employers required to keep OSHA injury and illness records must also enter percutaneous injuries in a sharps injury log; many dental offices are partially exempt from that recordkeeping rule, but the exposure documentation is still required. Bloodborne pathogens training records are kept for 3 years. All employee medical records relating to occupational exposures, vaccination history, and titer results must be kept strictly confidential and retained for the duration of employment plus 30 years.

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Personal Protective Equipment (PPE) Armamentarium

PPE serves as the physical shield protecting the dental assistant's skin, eyes, mucous membranes, and personal clothing from contact with blood, saliva, spatter, and aerosols. Under OSHA regulations, the employer must provide all required PPE at no cost to the employee, ensure appropriate sizing, clean or launder reusable garments, and replace worn or damaged equipment.

Protective Clinical Apparel

• Specifications: Fluid-resistant clinical gowns or lab jackets featuring long sleeves with tight knitted or elastic cuffs and a high neckline (mandarin or snap collar) to shield the chest and neck from spatter. When the assistant is seated chairside, the gown must extend over the lap and knees.
• Handling Rules: Clinical apparel must never be worn outside the treatment facility (prohibited in staff breakrooms, restrooms, or on the street). Garments must be removed before leaving the practice. Gowns must be changed daily, or immediately if visibly contaminated or soaked with blood or fluids. Reusable gowns must be laundered by the employer or an accredited commercial laundry service; employees are legally prohibited from taking contaminated garments home to wash.

Surgical Masks and Particulate Respirators

• Surgical Face Masks: Certified according to American Society for Testing and Materials (ASTM) standards based on fluid resistance, bacterial filtration efficiency (BFE), and particulate filtration efficiency (PFE):
  • ASTM Level 1: Low fluid resistance (80 mmHg); suitable for simple examinations or non-aerosol procedures.
  • ASTM Level 2: Moderate fluid resistance (120 mmHg); used for procedures with light-to-moderate spatter.
  • ASTM Level 3: High fluid resistance (160 mmHg); mandatory for procedures generating heavy aerosols and spatter (ultrasonic scaling, high-speed restorative preparation, surgical extractions).
• Usage Protocol: Masks must cover both the nose and mouth completely, with the metallic bridge piece pinched snugly over the nasal ridge. Masks must be changed between every single patient, or sooner if the mask becomes damp or moist from exhaled breath. Moisture compromises the filtration medium, permitting microorganisms to penetrate the barrier via capillary action ("wicking"). A mask must never be worn loosely beneath the nose, pulled under the chin, or dangling from one ear.
• Particulate Respirators (N95): Certified by NIOSH to filter at least 95% of airborne particles down to 0.3 µm. Indicated when treating patients during respiratory disease outbreaks or when airborne pathogens (such as M. tuberculosis) are suspected. Requires annual qualitative or quantitative fit testing.

Protective Eyewear and Face Shields

• Impact-Resistant Eyewear: Must be ANSI Z87.1 certified, featuring solid, rigid side shields to guard against lateral spatter and flying projectile debris (e.g., fractured amalgam, tooth fragments, calculus). Standard prescription eyeglasses do not provide adequate protection unless fitted with approved side shields.
• Full-Face Shields: Offer comprehensive facial protection against heavy spatter plumes. However, a face shield is an adjunct and must always be worn over a surgical mask or respirator, as aerosols and fine droplets easily curl beneath and behind the shield.
• Patient Eyewear: Patients must also be provided with protective eyewear throughout every clinical procedure to protect against dropped instruments, chemical splashes (such as 37% phosphoric acid etch or sodium hypochlorite), and aerosol spatter.

Clinical and Utility Gloves

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Hand Hygiene Standards

Hand hygiene is universally recognized as the single most critical measure for preventing healthcare-associated cross-infections. Microorganisms on the hands are classified as transient flora (temporary surface colonizers acquired during patient contact, easily removed) or resident flora (permanent microbial inhabitants in deeper skin layers):

• Routine Handwash: Washing with plain liquid soap and water for at least 15 to 20 seconds.
• Antiseptic Handwash: Washing with water and antimicrobial soap (e.g., 2% to 4% chlorhexidine gluconate or iodophor) for 15 to 20 seconds.
• Alcohol-Based Hand Rub (ABHR): Formulations containing 60% to 95% ethanol or isopropanol. Auxiliaries apply the product, vigorously rubbing all surfaces of the hands, fingers, and nail beds until completely dry (typically 20 to 30 seconds).
• The Golden Rule of Hand Hygiene: If hands are visibly soiled with blood, saliva, or organic matter, or after treating a patient with known spore-forming infections (Clostridioides difficile), washing with soap and water is mandatory. Alcohol rubs are inactivated by organic debris and do not destroy bacterial endospores.

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Standardized Sequences for Donning and Doffing PPE

The sequence of putting on (donning) and removing (doffing) PPE is strictly regulated to prevent self-contamination:

DONNING SEQUENCE (Before Patient Contact)   DOFFING SEQUENCE (After Treatment Concludes)
1. Protective Gown / Clinical Jacket       1. Gloves (Most heavily contaminated; remove first)
2. Surgical Mask or N95 Respirator          2. Protective Eyewear or Face Shield (Clean side handles)
3. Protective Eyewear or Face Shield       3. Protective Gown (Pull forward, roll inside-out)
4. Hand Hygiene & Disposable Gloves         4. Mask or Respirator (Touch ONLY ear loops/straps)
                                           5. IMMEDIATE Hand Hygiene (Wash soap/water or ABHR)

The Donning Sequence

1. Gown: Slip into gown, pull sleeves down to wrists, and fasten neck and waist ties securely.
2. Mask / Respirator: Position over nose and mouth, secure loops or headbands, and mold metallic bridge to nose.
3. Eyewear / Face Shield: Position over eyes and face; adjust for clear vision.
4. Gloves: Perform hand hygiene; don gloves and pull the glove cuffs up over the knitted cuffs of the gown to ensure no bare wrist skin is exposed.

The Doffing Sequence

1. Gloves: The exterior of gloves carries the heaviest bioburden. Grasp the outside edge near the wrist of one glove with the opposite gloved hand, peel downward turning it inside out. Hold the removed glove in the gloved hand. Slide an ungloved finger under the wrist of the remaining glove, peel off inside out over the first glove, and discard into trash.
2. Protective Eyewear / Face Shield: Handle only by the clean ear stems or headband; lift away from the face and place on a designated disinfection tray.
3. Protective Gown: Unfasten ties, peel gown away from the neck and shoulders, touching only the inside surfaces. Turn the gown inside out as it is rolled into a bundle, and discard or place in laundry bin.
4. Mask / Respirator: Grasp only the elastic ear loops or headbands, pull forward over the ears, and discard into the waste container. Never touch the front of the mask, which is heavily contaminated with spatter.
5. Hand Hygiene: Perform immediate hand hygiene using an alcohol rub or soap and water.