The Causes of Corrosion in Dental Handpieces
How poor reprocessing shortens lifespan and how professional cleaning helps prevent it
Dental handpieces are among the most heavily used and technically sensitive instruments in any dental practice. Corrosion in dental handpieces remains one of the most common reasons for premature failure, loss of performance, and costly repairs.
In most cases, corrosion is not a manufacturing fault, it is the result of inadequate handpiece cleaning, lubrication, sterilisation, or storage. Understanding the causes allows practices to protect their investment and maintain consistent clinical performance.
What causes corrosion in dental handpieces?
- Residual moisture inside the handpiece
Moisture is the single biggest contributor to handpiece corrosion.
Dental handpieces are constantly exposed to water through:
- Internal waterlines introduce residual moisture into bearings and turbine assemblies
- Incomplete drying after cleaning allows water to sit inside the handpiece
- Condensation can occur if handpieces are stored while still warm
If moisture is not fully removed after cleaning and autoclaving, it can remain trapped inside bearings, turbines, and internal shafts. Over time, this leads to oxidation, rust formation, and internal pitting, damage that is often invisible until performance drops or failure occurs.
- Inadequate pre-cleaning before sterilisation
One of the most common mistakes in dental instrument decontamination is placing handpieces into the autoclave without thorough cleaning.
Blood, saliva, dental materials, and biofilm residues:
- Become corrosive when exposed to heat
- Trap moisture against metal surfaces
- Accelerate chemical reactions inside the autoclave
Autoclaving a contaminated handpiece does not clean it, it effectively bakes on the debris, speeding up corrosion and internal wear.
Watch our youtube video here on preparing your handpiece for sterilisation.
- Use of aggressive or unsuitable cleaning chemicals
Not all detergents are safe for dental handpieces.
Corrosion is commonly caused by:
- Chloride-containing detergents
- Highly alkaline or acidic cleaners
- Over-concentrated solutions
- Non-medical or household disinfectants
- Submerging the handpieces in water/solution
These chemicals can strip protective oxide layers from stainless steel, leaving the metal vulnerable to rapid corrosion, especially when combined with heat.
We advise watching this video to see what happens if handpieces are submerged in chemicals or water – https://www.youtube.com/shorts/SuwIOl4gKXA
- Insufficient or incorrect handpiece lubrication
Handpiece lubrication is not optional — it is a critical step in corrosion prevention.
Without correct lubrication:
- Internal metal components are exposed to oxygen and moisture
- Bearings corrode faster
- Turbines wear prematurely
Common issues include missed lubrication cycles, incorrect oil types (such as cheap oil), or lubrication that fails to reach internal components.
Without adequate lubrication, internal metal surfaces are exposed directly to residual moisture, dramatically increasing the likelihood of rust and pitting. Think of it like a car, if your car runs out of oil, it will most likely break-down.
See our recommended lubricants and oiling machines here.
Watch our video on how to correctly manually oil your handpieces.
- Autoclave and sterilisation issues
While sterilisation is essential for infection control, it is also one of the harshest environments a handpiece experiences.
Factors that contribute to corrosion include:
- Poor steam quality
- Overloaded autoclaves
- Inadequate drying cycles
- Mineral contamination in water supplies
Repeated exposure to heat and moisture without effective drying significantly shortens handpiece lifespan.
We have a video on sterilising handpieces correctly in the autoclave – https://www.linkedin.com/feed/update/urn:li:activity:7376535387176927232/
- Poor storage conditions after sterilisation
Corrosion can continue long after the sterilisation cycle ends.
Storing handpieces:
- While still warm
- In sealed or non-ventilated pouches
- In humid environments
can cause internal condensation. Controlled drying and proper storage protocols are often overlooked but are vital in preventing long-term corrosion.
Ensure that handpieces are left to drain & dry with their head facing up, standing vertically. Once fully dried, they can be placed into a sterilisation bag, do not store damp handpieces in a sterilisation bag.
- Hard water and mineral deposits
Minerals found in hard water can accumulate inside handpieces, creating micro-environments that encourage corrosion and damage internal components.
Using treated or deionised water, and professional-grade cleaning equipment, helps eliminate this risk.
Buy our deionised water here
How to prevent corrosion in dental handpieces
Best practice includes:
- Thorough cleaning before sterilisation
- Manufacturer-approved detergents and lubricants
- Lubrication after every cycle
- Complete internal and external drying
- Proper storage in dry, ventilated conditions
For many practices, maintaining this level of consistency in-house is challenging due to time pressures and equipment limitations.
Final thoughts
Corrosion in dental handpieces is rarely caused by one single error. It is usually the result of small process gaps repeated daily.
If your practice needs further training on care & maintenance of handpieces, book on to one of our FREE webinars here – https://trigiene.co.uk/events/
