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How do Ultrasonic Teeth Cleaners Work?

My dental hygienist seemed to be spending more time spraying my teeth than scraping them, so I decided to check up on this. Turned out she was using an ultrasonic tooth scaler. I decided to poke around a bit to find out more.

Dog Eared
Ultrasound is sound above the limit of human hearing, around 15,000 Hertz (Hz, vibrations per second). Supposedly, the Beatles included some ultrasound on their Sgt. Pepper's Album to drive dogs crazy.

Applications
On a more practical level, difference frequencies of ultrasound can be used in all kinds of applications, from scanning a developing baby, to controlling pets, to cleaning teeth.

Good Vibrations
Ultrasonic tooth scalers use transducers that convert electricity into mechanical energy using materials like quartz crystals or specialized ceramics that change shape with electricity (piezoelectric) which generate up to 50,000 vibrations per second or by changing magnetic fields (magnetostrictive) which go up to 25,000 vibrations per second.

Under Pressure
These vibrations produce microscopic high and low pressure areas. This results in cavitation, which might sound bad for cavity prone teeth, but it means the formation of bubbles filled with water vapour rather than air. The vibration stretches and compresses these tiny bubbles until they implode and release a burst of heat and pressure. This energy loosens stuck particles, but it happens on a tiny scale with enough water as coolant so I don't notice this tempest in my tooth spot.

I find it more pleasant to have my teeth cleaned this way and less with the scraping, but ultrasound may add extra wear on metal implants, so it might be worth discussing the pros and cons of this technology with your dentist or hygienist.

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Survivors

Artist: Jeff Kulak

Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.

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Egg BB

Artist: Jeff Kulak

Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.

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Comet Crisp

Artist: Jeff Kulak

Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.

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T-Rex and Baby

Artist: Michelle Yong

Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.

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Buddy the T-Rex

Artist: Michelle Yong

Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.

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Geodessy

Artist: Michelle Yong

Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.

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Science Buddies

Artist: Ty Dale

From Canada, Ty was born in Vancouver, British Columbia in 1993. From his chaotic workspace he draws in several different illustrative styles with thick outlines, bold colours and quirky-child like drawings. Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way.

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Western Dinosaur

Artist: Ty Dale

From Canada, Ty was born in Vancouver, British Columbia in 1993. From his chaotic workspace he draws in several different illustrative styles with thick outlines, bold colours and quirky-child like drawings. Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way.

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Time-Travel T-Rex

Artist: Ty Dale

From Canada, Ty was born in Vancouver, British Columbia in 1993. From his chaotic workspace he draws in several different illustrative styles with thick outlines, bold colours and quirky-child like drawings. Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way.