Quick facts
- A scaler removes calculus deposits from the teeth, and it comes in two families: a powered instrument with a vibrating tip, and a hand instrument used by the operator.
- United States: the powered instrument has its own entry. 21 CFR 872.4850 covers an ultrasonic scaler and places it in Class II.
- United States: an abrasive scaler that attaches to a handpiece is a separate entry. 21 CFR 872.4840 covers a rotary scaler and also places it in Class II.
- United States: the hand scaler is not in either entry. It is one of the instruments named in the dental hand instrument entry, 21 CFR 872.4565, which is Class I.
- Canada: Rule 9(1) of Schedule 1 to the Medical Devices Regulations, SOR/98-282 classifies an active therapeutic device that administers energy to the body as Class II, while Rule 3(b) places all surgical or dental instruments in Class I.
- The purchase question is the tip and the reprocessing routine around it, not the colour of the handle.
A scaler is one of the few dental instruments that does two jobs at once: it removes hard deposits and it sprays, vibrates or irrigates at the same time. The powered and hand versions look like the same task to the operator and are two different articles to the regulator. This article sets out what each scaler does, how each country files the powered and hand versions, and what a clinic should confirm before it buys or reprocesses one.
What does a dental scaler do?
A scaler dislodges calculus, the mineralised deposit that forms on teeth, during cleaning and periodontal therapy. The powered version uses a tip driven by ultrasound or air to fracture and lift the deposit; the hand version uses an edge that the operator draws along the tooth surface. 21 CFR 872.4850 describes an ultrasonic scaler as a device intended for use during dental cleaning and periodontal therapy to remove calculus deposits from teeth by application of an ultrasonic vibrating scaler tip to the teeth.
Three properties decide whether the instrument does the job:
- The tip. The tip is the part that touches the tooth and the tissue, and its shape sets what can be reached.
- Power and irrigation. A powered scaler delivers water or a solution through the tip, which is part of the cleaning step.
- The handpiece and its coupling. The tip seats in a handpiece, and the handpiece is the high-touch item between patients.
The tip is inside the device entry rather than separate from it, but the reprocessing routine is not. The handpiece, the tip and the cable are handled between every patient, and that routine decides whether the instrument is ready for the next one.
How do the Canadian and United States rules treat a scaler differently?
The United States splits the powered and hand versions across three entries; Canada reaches the same class from two rules that run in opposite directions.
| Item | Canada | United States |
|---|---|---|
| Entry that catches the ultrasonic scaler | None; class derived by rule | 21 CFR 872.4850, ultrasonic scaler, Class II |
| Entry that catches the rotary scaler | None; class derived by rule | 21 CFR 872.4840, rotary scaler, Class II |
| Entry that catches the hand scaler | None; class derived by rule | 21 CFR 872.4565, dental hand instrument, Class I |
| What drives the powered class | Active therapeutic device under Rule 9(1) | The device definition itself |
| What drives the hand class | All surgical or dental instruments under Rule 3(b) | The device definition itself |
| Scaler tip | Part of the device | Part of the device it belongs to |
| Premarket position | Licence only where the derived class requires one | Ultrasonic and rotary scalers are Class II; the hand instrument is Class I |
| Wording that decides the case | Administers or withdraws energy to or from the body | Vibrating tip, or abrasive device attached to a handpiece |
The United States uses three sections. The ultrasonic scaler sits in Class II, its identification pinned to the vibrating tip applied to the teeth. The rotary scaler sits in a separate Class II section and is described as an abrasive device attached to a powered handpiece. The hand scaler is not in either one: it is one of the instruments named in the dental hand instrument entry, which is Class I and lists the periodontic curette, file, probe, hoe, knife and marker alongside it.
Canada reaches the same split by two rules instead of three entries. Rule 9(1) of Schedule 1 classifies an active therapeutic device, including any dedicated software, that is intended to be used to administer or withdraw energy to or from the body as Class II, which catches a powered scaler. Rule 3(b) states that all surgical or dental instruments are classified as Class I, which catches the hand scaler. The two rules are the reason a powered instrument and a hand instrument that do the same job carry different classes in both countries.
Which scaler type sits in which entry?
| Type | How it works | Class note |
|---|---|---|
| Ultrasonic scaler | A vibrating tip removes deposits | Class II; US entry 872.4850; Canada Rule 9(1) |
| Sonic or air scaler | An air-driven tip removes deposits | Class II; the same US entry, described by its action |
| Rotary scaler | An abrasive head on a powered handpiece | Class II; US entry 872.4840; Canada Rule 9(1) |
| Hand scaler and curette | A hand-held edge used by the operator | Class I; part of the hand instrument entry 872.4565; Canada Rule 3(b) |
| Scaler tip | The disposable or reusable contact part | Part of the powered device in both countries |
The type view is the reason a clinic should treat the powered and hand instruments as two product lines in the equipment file. They carry different classes, they are reprocessed differently, and a change to one does not justify a change to the record of the other.
What should a clinic confirm before it reprocesses a scaler?
Five checks keep a scaler from becoming a source of unexplained variation:
- The maker's reprocessing instruction. The handpiece, the tip and the cable each have a stated routine, and the clinic follows it rather than a house preference.
- Tip compatibility. The tip seats in the handpiece, and the pairing is fixed by the maker.
- Waterline and irrigation. The line feeding the tip is part of the instrument's hygiene, and it is checked on a routine.
- One change at a time. A tip change and a handpiece change made in the same week cannot be separated afterwards.
- The record belongs with the instrument. The reprocessing log, the tip type and the date belong together in the equipment file.
Which consumables does a chairside tray go through?
A chairside tray is restocked with suction tips, swabsticks, gauze, bibs and gloves in the same cycle as the instruments. For clinics buying at case level, the wholesale ordering page sets out account and case terms, and the B2B wholesale collection lists the lines held for institutional buyers. The high-volume evacuator tips, 100 per bag are the kind of line we hold for chairside work, and clinics that also run an in-house sterilizer can start with the biological indicator 5-pack trial and read the sterilization monitoring collection for the monitoring lines.
Sources
- 21 CFR 872.4850, ultrasonic scaler
- 21 CFR 872.4840, rotary scaler
- 21 CFR 872.4565, dental hand instrument
- Medical Devices Regulations, SOR/98-282, full text, Schedule 1
- Health Canada, medical devices
- Royal College of Dental Surgeons of Ontario, standards and guidelines resources
- Canadian Dental Association
- Canadian Dental Hygienists Association
- American Dental Association, infection control and sterilization
- American Dental Association, science and research institute
- World Health Organization, oral health fact sheet
- ISO 11609:2017, dentistry, dentifrices
- Canadian Centre for Occupational Health and Safety, OSH answers
- CCOHS, personal protective equipment
- openFDA device classification database
- FDA device classification database search
- US OSHA bloodborne pathogens standard, 1910.1030
- Public Health Ontario, infectious diseases
- Public Health Ontario, laboratory test information index
- World Health Organization, laboratory biosafety manual
Related reading
- Dental Handpieces in Canada vs the US: Which Reprocessing Rules Apply
- Dental Burs in Canada vs the US: Which Type and Numbering Rules Apply
- Prophylaxis Paste and Fluoride Polish in Canada vs the US: Which Rules Apply
- Saliva Ejectors in Canada vs the US: Which Device and IPC Rules Apply
CliniEco Medical supplies dental and clinic consumables of the kind described in this article. MDEL #35334. This article is written for clinic, procurement and infection-control professionals and is not clinical guidance; instrument handling and reprocessing belong to the treating professional and the clinic's infection-control lead.
Frequently Asked Questions
Is an ultrasonic scaler a Class II device in the United States?
Yes. 21 CFR 872.4850 covers an ultrasonic scaler, which is a device intended for use during dental cleaning and periodontal therapy to remove calculus deposits from teeth by application of an ultrasonic vibrating scaler tip, and places it in Class II.
What class is a rotary scaler in the United States?
It is Class II. 21 CFR 872.4840 covers a rotary scaler, described as an abrasive device intended to be attached to a powered handpiece to remove calculus deposits from teeth during dental cleaning and periodontal therapy.
What class is a hand scaler?
In the United States it is Class I. It is not in the ultrasonic or rotary entry; it is one of the instruments named in the dental hand instrument entry, 21 CFR 872.4565, which also lists the periodontic curette, file, probe, hoe, knife and marker. In Canada a hand scaler is Class I under Rule 3(b), which classifies all surgical or dental instruments as Class I.
How is a powered scaler classified in Canada?
Rule 9(1) of Schedule 1 classifies an active therapeutic device that is intended to administer or withdraw energy to or from the body as Class II, and a scaler with a vibrating tip meets that wording. The class is the same as the United States, reached by a general rule rather than a named entry.
Is the scaler tip a separate device?
No. The tip is part of the powered device it belongs to in both countries. What changes between the tip designs is the reprocessing routine, not the class.
What should a clinic keep on file for a scaler?
The maker's reprocessing instruction for the handpiece, the tip and the cable, the tip-to-handpiece compatibility, the irrigation or waterline check, and the instrument reprocessing log with the tip type and date. The record belongs in the equipment file, not the purchase file.
Is a sonic or air scaler in the same entry as an ultrasonic scaler?
In the United States it is. 21 CFR 872.4850 describes the ultrasonic scaler by its action, removing deposits by application of a vibrating tip, so a sonic or air-driven tip of the same kind is handled the same way. In Canada the powered scaler reaches Class II through Rule 9(1), regardless of how the tip is driven.
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