Ultrasonic Cleaners for Dental and Clinic Instruments
An ultrasonic cleaner reaches the hinges, serrations and burs a brush misses — when it is filled, degassed, loaded and tested properly. How to choose one and keep it working.
How cavitation cleans
Transducers under the tank vibrate tens of thousands of times a second. The sound waves form microscopic bubbles in the liquid that grow and then collapse violently — cavitation. Each collapse releases a tiny jet and pressure pulse that loosens soil from metal, including inside box joints and serrations. The detergent then holds the soil in solution so it rinses away.
Frequency
General instrument cleaners commonly run at around 35–40 kHz. Lower frequencies make larger, more aggressive bubbles; higher frequencies make smaller, gentler ones for delicate items. Some units sweep the frequency slightly to even out hot and dead spots.
Dissolved gas
Fresh solution is full of dissolved air, which cushions each bubble’s collapse. That is why every new fill must be degassed before it cleans properly.
Temperature
Warmth helps many detergents, but hot liquid can fix protein onto instruments. Stay within the detergent label’s range, and remember the tank warms itself through the day.
Not a disinfector
Cavitation cleans; it does not disinfect. Instruments coming out of the tank are still contaminated and are handled with gloves until they have been sterilised.
Choosing an ultrasonic cleaner
| Feature | What to check |
|---|---|
| Tank size | Your largest cassette or longest instrument lies flat in the basket, fully submerged, with space around it |
| Basket | A mesh basket that keeps instruments off the tank floor, and cassette racks if you use cassettes |
| Lid | A close-fitting lid to contain aerosols during the cycle |
| Timer and heater | A timer that matches your detergent’s contact time, and a heater with a temperature display if the detergent needs warmth |
| Drain | A drain valve on larger tanks, so staff never tip out or bail contaminated liquid |
| Lumen irrigation | Some larger units flush lumened instruments through ports; otherwise lumens are brushed and flushed by hand |
| Records | Cycle logging, if your policy needs a record of each wash |
Read next Where it sits in the reprocessing roomWasher-disinfector instead?
Filling, degassing and loading
- Fill with water to the fill line and add a low-foaming detergent made for ultrasonic use, at the dilution on its label. Never use plain water alone, and never flammable solvents such as alcohol.
- Degas every fresh fill by running the tank empty — often for 5 to 10 minutes; the manual gives the time for your model.
- Rinse gross soil off in cool water first; heavy soil exhausts the solution quickly.
- Open hinged instruments, take apart anything designed to come apart, and keep everything in the basket, never resting on the tank floor.
- Do not overload or stack instruments — items shield each other from the sound waves.
- Keep every item fully submerged, close the lid and run the full time. Never put hands in the tank while it is running.
- Afterwards rinse thoroughly, ideally with purified water, then dry and inspect under magnification before packing.
Read next The full cleaning sequence
What should not go in
If an item’s instructions for use do not say ultrasonic cleaning is allowed, ask its manufacturer before putting it in. Typical exclusions:
- Powered handpieces, motors and anything with electronics, unless the maker specifically allows it — handpieces usually have their own cleaning and lubrication routine.
- Optics and scopes, and items with glued or cemented joints.
- Anodised aluminium items, such as colour-coded handles, whose finish can be stripped.
- Some plated instruments, where worn plating can lift further.
- Plastic, rubber and silicone items, which absorb the energy and clean poorly.
- Dissimilar metals in the same load, which can lead to staining and corrosion.
Testing and daily care
Foil test
Hold a strip of household aluminium foil upright in the running tank for the time your manual states, then look at it against the light. You should see even pitting and small holes across the strip. Large untouched areas point to dead zones or a failing transducer.
Cleaning indicators
Commercial test devices carry a standard test soil that should be removed in a normal cycle — a more reproducible check than foil.
How often to test
At installation, then at the interval your policy or the manufacturer sets, and whenever cleaning results drop.
End of the day
Drain the solution rather than leaving it overnight, rinse and dry the tank, wipe the lid and basket, and leave the tank empty and dry. Change the solution sooner whenever it looks cloudy or soiled.
Read next Autoclave maintenance checklist
Related guides
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Frequently asked questions
What frequency should an instrument ultrasonic cleaner use?
Why does an ultrasonic cleaner need degassing?
Can dental handpieces go in an ultrasonic cleaner?
Does an ultrasonic cleaner sterilise instruments?
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