Dental Amalgam in Canada vs the US: Which Class Applies?

Quick facts

• Dental amalgam is a combination of elemental mercury and an amalgam alloy composed primarily of silver, tin and copper, used for the direct filling of carious lesions or structural defects in teeth.
• United States: 21 CFR 872.3070 places dental amalgam, mercury and amalgam alloy in Class II with special controls, and the special control is a named FDA guidance document for the device.
• The other parts of the same restoration sit in different classes and different sections: the amalgam capsule is Class I under 21 CFR 872.3110, and the operative amalgam carrier, amalgam carver and amalgam condenser are Class I within the dental hand instrument section, 21 CFR 872.4565.
• Canada: the definition of "dental material" in the Medical Devices Regulations was repealed in 2002, so a restorative material is classified by the general rules rather than by a material-specific rule.
• Under those rules, a restorative material placed into a prepared cavity enters the body through an artificially created opening, which is the definition of a surgically invasive device, and Rule 1(1) of Schedule 1 to the Medical Devices Regulations, SOR/98-282 classifies it as Class II.
• Canadian regulation text used here is current to 2026-09-21 and last amended 2026-06-17, as stated on the official consolidation.

Dental amalgam is the material that most often surprises people who assume a single restoration carries a single class. It does not. In the United States the alloy, the capsule and the hand instruments are three separate entries in three classes, and in Canada the material and the instruments are separated by two different rules. This article sets out both routes, the components of a single amalgam restoration, and the record a dental practice should hold.

What is dental amalgam in each classification system?

The American identification paragraph is unusually complete, and it is worth reading closely because it decides which components fall inside the section.

Section 872.3070(a) describes dental amalgam as a device consisting of a combination of elemental mercury, supplied as a liquid in bulk, sachet or predosed capsule form, and amalgam alloy composed primarily of silver, tin and copper, supplied as a powder in bulk, tablet or predosed capsule form, for the direct filling of carious lesions or structural defects in teeth. The paragraph then adds that the section also includes the individual component devices, mercury and amalgam alloy, when intended to be combined with each other to form dental amalgam.

The classification paragraph places the device in Class II with special controls, and names the special control: the FDA "Class II Special Controls Guidance Document: Dental Amalgam, Mercury, and Amalgam Alloy".

Canada classifies the material without naming it. Three definitions and one rule do the work:

• Invasive device — a device intended to come into contact with the surface of the eye or to penetrate the body, either through a body orifice or through the body surface.
• Surgically invasive device — an invasive device intended to enter the body through an artificially created opening that provides access to body structures and fluids.
• Rule 1(1) — all surgically invasive devices are classified as Class II.

A restorative material is placed into a cavity that the operator has created, which is an artificially created opening giving access to a tooth structure. Rule 1(1) therefore reaches it, and the answer is Class II.

How does the dental amalgam class differ between Canada and the United States?

The material lands in the same class on both sides, but the surrounding pieces do not.

Item	Canada	United States
Amalgam and amalgam alloy	Rule 1(1), Class II as a surgically invasive device	21 CFR 872.3070, Class II with a named special control
Amalgam capsule	Container or accessory, Class I by rule	21 CFR 872.3110, Class I, exempt from premarket notification
Operative amalgam carrier, carver and condenser	Rule 3(b), Class I as dental instruments	21 CFR 872.4565, Class I, exempt subject to 872.9
Material-specific definition	None; repealed in 2002	Not applicable; each generic type is named
Basis for the material class	The way the material enters the body	The generic type described in the section
Special controls concept	Not a Canadian mechanism	Named in the section

The American code separates the workflow by generic type, and each type carries its own class and its own exemption position. The alloy is Class II and carries a special control. The capsule is a container device and is Class I. The hand instruments are Class I and appear in a long list of named operative instruments.

Canada separates the same workflow by a different axis. The material is caught by the surgically invasive rule and lands in Class II. The instruments are caught by Rule 3(b), which states that all surgical or dental instruments are classified as Class I. The capsule is a container rather than an instrument or an implant, and falls to the residual non-invasive rule.

What happened to the Canadian definition of dental material?

It was repealed, and that repeal is the single most useful fact about the Canadian classification of restorative materials.

The definition section of the Medical Devices Regulations once carried an entry for "dental material". The consolidation now reads that the term is repealed by SOR/2002-190, s. 1. Since 2002 there has been no definition of a dental material in the regulations, and therefore no material-specific rule that could be applied to one.

The consequence is that a restorative material is classified by the general rules, and Rule 1(1) is the rule that reaches it. This is not a gap. It is a deliberate simplification: the material is classified by what it does in the body rather than by a category label.

For a practice that buys restorative materials in several countries, the practical effect is that the Canadian class of the material will rarely be found on a label. It is derived from the intended use, and the intended use is stated by the maker.

Which parts of a single amalgam restoration carry which class?

A single restoration touches four different regulatory objects, and the two systems allocate them differently.

Component	Canada	United States
Mercury and amalgam alloy, supplied for combination	Rule 1(1), Class II	872.3070, Class II
Predosed capsule containing the alloy	Residual non-invasive rule, Class I	872.3110, Class I
Operative amalgam condenser	Rule 3(b), Class I	872.4565, Class I
Operative amalgam carver	Rule 3(b), Class I	872.4565, Class I
Matrix band and retainer	Rule 3(b), Class I as a dental instrument	872.4565, Class I
Amalgam triturator used to mix the capsule	Rule 12, Class I as another active device	Separate generic type, Class I or Class II by use

Two observations follow. The first is that the class of the material is the only Class II entry in the table, in both countries. The restoration is a Class II object carried by Class I tools.

The second is that the American code reaches this allocation by naming each generic type, while Canada reaches it by applying two rules — Rule 1(1) for the material and Rule 3(b) for the instruments — to the same procedure.

A buyer or quality lead who wants to check a specific product can look up the American entry in the openFDA device classification API or the FDA classification database. On the Canadian side the class follows from the rules.

What should a dental practice keep on file for amalgam restorations?

Six items, and the first two are set by occupational health rather than by device regulation.

• The safety data sheet for the alloy and for any bulk mercury held on site. Mercury hygiene requirements sit with the practice's occupational health obligations.
• The amalgam waste and scrap handling record. Recovered amalgam scrap and used capsules are managed as a waste stream under the practice's protocol.
• The device file for the capsule and the triturator. The maker's instructions for mixing and the servicing record belong with the device.
• The instrument file for the carriers, condensers and carvers. Cleaning and sterilization records for the instruments belong with the reprocessing log.
• The maker's intended use statement for the material. In Canada the class is derived from how the material enters the body, and the intended use is the anchor.
• The licence or clearance position. In Canada, the class and licence status; in the United States, the position of each component under its own section.

Which consumables does a restorative operatory restock alongside its materials?

A restorative operatory restocks isolation, moisture control and barrier supplies on the same cycle as its materials. For practices 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 cotton rolls cover isolation during placement, the three-layer dental bibs cover the patient barrier, and practices that want to see the monitoring and consumable lines together can start with the sterilization monitoring collection or the biological indicator 5-pack trial.

Sources

1. 21 CFR 872.3070, dental amalgam, mercury and amalgam alloy
2. 21 CFR 872.3110, dental amalgam capsule
3. 21 CFR 872.4565, dental hand instrument
4. 21 CFR 872.9, limitations of exemptions
5. Medical Devices Regulations, SOR/98-282, full text and Schedule 1
6. Health Canada, medical devices
7. openFDA device classification API
8. FDA device classification database
9. Royal College of Dental Surgeons of Ontario, standards and guidelines
10. Canadian Dental Association
11. Canadian Dental Hygienists Association
12. Public Health Ontario, infectious diseases
13. Public Health Ontario, laboratory test information index
14. CLSI standards
15. Canadian Centre for Occupational Health and Safety, OSH answers
16. World Health Organization, oral health
17. US OSHA bloodborne pathogens standard, 1910.1030
18. ISO 10993-1:2018, biological evaluation of medical devices
19. ISO 11609:2017, dentistry, dentifrices
20. American Dental Association, infection control and sterilization

Related reading

• Dental Syringes in Canada vs the US: Which Device Class Applies
• Saliva Ejectors in Canada vs the US: Which Device and IPC Rules Apply
• Cotton Rolls and High-Volume Evacuation: Moisture Control in Canadian Dentistry

CliniEco Medical supplies eye care, laboratory 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; material selection and restorative technique belong to the treating dentist and the provincial requirements that apply to the practice.

Frequently Asked Questions

What class is dental amalgam in the United States?

Class II with special controls under 21 CFR 872.3070. The special control is the FDA "Class II Special Controls Guidance Document: Dental Amalgam, Mercury, and Amalgam Alloy", and the section also covers the individual component devices, mercury and amalgam alloy, when intended to be combined to form dental amalgam.

What class is dental amalgam in Canada?

Class II, derived from Rule 1(1) of Schedule 1 to the Medical Devices Regulations. The rule classifies all surgically invasive devices as Class II, and a restorative material placed into a cavity enters the body through an artificially created opening.

Is there a definition of dental material in the Canadian regulations?

No. The definition of "dental material" was repealed by SOR/2002-190, s. 1, so a restorative material is classified by the general rules rather than by a material-specific rule.

What class is the amalgam capsule?

Class I in the United States under 21 CFR 872.3110, which describes the capsule as a container device in which silver alloy is intended to be mixed with mercury, and exempts it from premarket notification subject to the limitations in 872.9. In Canada a container of this kind falls to the residual non-invasive rule.

Are the instruments used with amalgam the same class as the material?

No, in either country. The operative amalgam carrier, carver and condenser are Class I, in the United States as named items in 21 CFR 872.4565 and in Canada under Rule 3(b), which classifies all surgical or dental instruments as Class I.

Do Canada and the United States classify a single amalgam restoration the same way?

They reach a similar allocation by different routes. Both place the material in Class II and the hand instruments in Class I. The United States names each generic type in its own section, while Canada applies the surgically invasive rule to the material and the dental instrument rule to the tools.