How do dental autoclaves help in infection control?

What is a dental autoclave?

The dental autoclave, also known as a steam sterilizer, is a machine that disinfects and sanitizes all of your dentist’s tools. It uses high-pressure temperatures and steam to combat debris or bacteria in order to meet CDC requirements for proper sanitation. 

Using the autoclave to sterilize dental handpieces and instruments is an incredibly important part of preventing infections in patients. The process starts with a system that uses heat to kill microorganisms, including bacteria and spores. It works by delivering pressurized steam through high-temperature heating coils at around 212 degrees Fahrenheit for 15 minutes or more depending on what type of material it’s working with – this makes sure everything is killed off.

With an autoclave, different types of high heat are used to sterilize the load. The time required to sterilize something depends on what that object is made of, whether it’s wrapped or unwrapped, and what type of autoclave is being used.

According to the Centers for Disease Control (CDC) Guidelines for Disinfection and Sterilization of dental facilities, pressurized steam is the most dependable method in sterilizing all types of handpieces and instruments. It’s non-toxic and inexpensive, it kills microbes quickly.

How does dental autoclaving kill bacteria, microbes, or pathogens?

With the invention of autoclaves , medicine became more sanitary and efficient. Charles Chamberland designed modern-day versions that rely on moist-heat sterilization to clean items such as dental handpieces and instruments from vegetative cells, viruses, and endospores which can survive boiling temperatures without damaging them. Most importantly they are considered the most effective method for performing this type of process due to their high efficiency rates in removing all contaminants with no damage done.

In their most basic form, autoclaves are enclosed chambers in which the air has been removed and replaced with increasing amounts of steam. When a dental handpiece or instrument is placed inside the autoclave machine, it can be heated to temperatures about 80 degrees centigrade higher than the boiling point of water without actually becoming liquid. This process helps sterilize all types of dental handpieces and instruments that might come into contact with human tissue during oral surgery or other dental procedures.

A gravitational displacement autoclave relies on gravity to remove any remaining pockets of gas from its chamber by supplying a constant flow of steam at high pressure through pipes spaced around the bottom perimeter edge near floor level while simultaneously adding more fresh hot water from another source until there’s no longer space for additional equipment within this type device.

Air, which is heavier than steam, sinks to the bottom of the chamber where it’s forced out through a vent. In pre-vacuum sterilizers, this air is removed completely using a high-speed vacuum before introducing any steam into that same chamber. When we remove all air in something there’s nothing left for anything else to react with so things work more efficiently and don’t take as long periods because they’re able to penetrate deep inside these wrapped items. Many autoclaves are capable of both gravity and pre-vacuum cycles but most use gravity for waste decontamination while utilizing pre-vacs for sterilization processes .

The autoclave typically operates at 121 °C or 132° C, depending on the material being treated and for how long will be in contact with high-pressure steam as well as humidity up to 20 pounds per square inch (psi). The length of exposure depends solely on what kind of item you are trying to cleanse but usually lasts between 20 minutes.

Types of Dental Autoclaves Used in Dental Practices

Not all autoclaves work the same way. Understanding the differences helps dental practices choose the right equipment for their sterilization needs.

Gravity Displacement Autoclaves

These are the most common types found in dental offices. Steam enters the chamber and forces air downward and out through a drain vent at the bottom. They are effective for unwrapped instruments and solid loads but take longer — typically 15 to 30 minutes at 121°C (250°F).

Pre-Vacuum (Type B) Autoclaves

A high-speed vacuum removes all air from the chamber before steam is introduced. This allows steam to penetrate wrapped instruments, hollow devices, and complex dental handpieces far more effectively. Pre-vacuum sterilizers are recommended by the CDC for sterilizing dental handpieces because of their superior penetration capability.

Flash/Immediate-Use Autoclaves

Designed for rapid sterilization of unwrapped instruments between patients. While fast, they are not intended as a substitute for full sterilization cycles.

For dental practices that rely on high-speed and low-speed handpieces daily, investing in a pre-vacuum autoclave is the safest and most compliance-friendly choice.

Step-by-Step Dental Autoclave Process

Sterilizing a dental handpiece correctly requires more than just placing it in the autoclave. The CDC outlines a multi-step reprocessing protocol that every dental health care professional (DHCP) must follow:

Step 1: Flush the Handpiece

Immediately after use, run water through the handpiece for at least 30 seconds in the operatory. This removes any patient material from the internal waterline.

Step 2: Clean and Remove Bioburden

In the sterilization area, clean the handpiece under running water with a soft brush and mild detergent. Remove all visible debris. Bioburden left on instruments can shield microorganisms from heat, compromising the sterilization process. Note: Never use alcohol as a cleaning agent, it can dehydrate spores and increase sterilization resistance.

Step 3: Lubricate per manufacturer's instructions

Lubricate the handpiece according to the manufacturer's guidelines before packaging. Proper lubrication protects internal bearings and turbines during the autoclave cycle and extends the lifespan of the handpiece.

Step 4: Package and Wrap

Place the cleaned and lubricated handpiece in a sterilization pouch, paper side up. Sealed packaging prevents recontamination after sterilization.

Step 5: Load and Run the Autoclave

Load pouches on their edge or paper-to-plastic side to allow proper steam circulation. Run the appropriate sterilization cycle, typically 132°C to 135°C for pre-vacuum cycles or 121°C for gravity displacement.

Step 6: Dry, Inspect, and Store

After the cycle completes, allow the load to fully dry. Inspect packaging for any tears or moisture damage before storing. Store sterilized handpieces in a clean, dry area and use within manufacturer-recommended timeframes.

What the CDC Says About Dental Handpiece Sterilization

The Centers for Disease Control and Prevention (CDC) has issued clear, consistent guidance on dental handpiece reprocessing, and it goes beyond simple cleaning.

The CDC states that all handpieces, including both high-speed and low-speed motors, reusable prophy angles, and any intraoral instrument that can be removed from air and waterlines, must be heat sterilized between each patient. Surface disinfection, wiping with a low-level disinfectant, or immersion in germicide solutions are not acceptable alternatives.

In its 2018 Statement on Reprocessing Dental Handpieces, the CDC reinforced three key points:

• Clean and heat sterilize all removable intraoral instruments between patients

• Use only FDA-cleared devices with validated reprocessing instructions

• Do not use any handpiece that cannot be heat sterilized and lacks FDA clearance for reprocessing

Practices that rely on outdated or non-autoclavable handpieces are putting patients at risk and operating outside of CDC compliance standards. Hayes Handpiece works with dental practices to identify compatible, autoclavable handpiece models and ensure their teams are trained on current CDC protocols.

Common Autoclave Errors That Compromise Sterilization

Even with the right equipment, sterilization failures happen when proper procedures are not followed. These are the most common mistakes dental teams make:

Skipping Pre-Cleaning

Placing instruments directly into the autoclave without removing bioburden is one of the most significant errors. Organic material acts as a physical shield that blocks steam from reaching microorganisms.

Overloading the Chamber

Packing too many instruments into a single cycle prevents adequate steam penetration. Pouches need air circulation to sterilize properly.

Incorrect Temperature or Cycle Time

Running the autoclave at the wrong temperature or cutting cycles short can leave harmful pathogens alive. Always verify settings before each cycle.

Skipping Biological Indicator (Spore) Testing

The CDC recommends using biological indicators and spore tests at least weekly to confirm the autoclave is achieving effective sterilization. Many practices skip this step, which means sterilization failures can go undetected for weeks.

Improper Storage After Sterilization

Sterilized instruments that are not stored correctly, in damp areas, torn pouches, or open trays- can become recontaminated before they ever reach a patient.

Hayes Handpiece provides training programs that help dental teams identify and correct these errors, reducing compliance risk across the practice.

How Autoclave Sterilization Protects Patients and the Practice

Proper autoclave sterilization is not only a clinical responsibility, but it is also a legal and regulatory one.

Every dental practice is required to comply with CDC Dental Guidelines for Infection Control, OSHA's Bloodborne Pathogen Standard, and state dental board regulations. Failure to follow proper sterilization protocols can result in:

• Cross-contamination between patients

• Transmission of bloodborne pathogens, including Hepatitis B, Hepatitis C, and HIV

• OSHA citations and fines

• State dental board disciplinary action

• Patient harm and associated liability

Steam sterilization using an autoclave remains the gold standard because it is the only method proven to eliminate all microbial life, including bacterial spores, viruses, and fungi, from dental handpieces and instruments. No chemical disinfectant achieves the same level of kill.

For dental practices, maintaining a consistent, documented sterilization process is also a patient trust issue. Patients expect that every instrument used in their care is completely safe.

Summary

Dental handpieces and instruments are used daily to perform a variety of procedures. The handpieces and instruments must be sterilized between uses, the process that is relatively easy with proper equipment and training.

Sterilizing dental handpieces and instruments can be time-consuming if you don’t have the right equipment or a team that knows how to properly use them. Using outdated methods can also lead to contamination which puts patients at risk for infection.

Hayes Handpiece has developed an effective autoclave training program that will help you and your team better understand how steam sterilizers work so your practice runs more efficiently while ensuring patient safety. Our Dental Handpiece Sterilization and Equipment Maintenance and CDC Dental Guidelines and Infection Control training are available online and in an in-office setting.

For our other list of in-house and online training, you may also visit the links below:

• Dental OSHA Training
• Dental HIPAA Training
• CE Credits In-House Training
• CDC Dental Guidelines and Infection Control

 

Frequently Asked Questions 

Q: How long does it take to autoclave a dental handpiece?

Cycle time depends on the type of autoclave and the load being sterilized. Gravity displacement autoclaves typically run 15 to 30 minutes at 121°C, while pre-vacuum autoclaves can complete cycles in as little as 3 to 4 minutes at 134°C. Drying time adds additional minutes after the sterilization cycle ends.

Q: Can all dental handpieces be autoclaved?

Most modern dental handpieces are designed to be fully autoclavable. However, older or lower-quality handpieces may not withstand repeated high-heat cycles. The CDC states that any handpiece that cannot be heat sterilized and lacks FDA-cleared reprocessing instructions should not be used in patient care.

Q: How often should a dental office run spore tests on its autoclave?

The CDC recommends biological indicator (spore) testing at least once per week. Spore tests verify that the autoclave is reaching temperatures and conditions necessary to kill the most heat-resistant microorganisms. Results should be documented and records kept for compliance purposes.

Q: What is the difference between sterilization and disinfection in a dental office?

Disinfection reduces the number of microorganisms on a surface but does not eliminate all microbial life, particularly resistant spores. Sterilization, achieved through autoclaving, destroys all forms of microbial life, including bacterial spores. For dental handpieces and instruments that enter a patient's mouth, sterilization is always required.

Q: Does Hayes Handpiece repair handpieces that have been damaged by autoclaving?

Yes. Repeated sterilization cycles can wear down internal components, particularly bearings and turbines, in dental handpieces. Hayes Handpiece specializes in repairing and reconditioning all major brands of dental handpieces. Proper lubrication and following the manufacturer's autoclave instructions help minimize wear and extend handpiece life.

Q: What training does Hayes Handpiece offer for autoclave compliance?

Hayes Handpiece offers both online and in-office training programs covering dental handpiece sterilization, CDC dental guidelines, OSHA compliance, and HIPAA training. These programs are designed to help dental teams build consistent, compliant sterilization workflows.

Hayes specializes in various dental handpiece repairs and dental instrument sharpening and re-tipping. Our experienced technicians have decades of experience working with all major brands of dental handpieces including:

  A-dec | Beyes | Bien Air | Denticator | Hall | Henry Schein | Impact Air | Kavo | Lares   Midwest | Morita | Nobel Biocare | Nouvag | NSK | Patterson | Schein Master   

Shamrock | Star | Strauman | Stryker | W&H | Young

American Eagle | HU Friedy | Nordent | PDT