Quick facts
- Base plate shellac is a device composed of shellac intended to rebuild the occlusal rim of full or partial dentures — the material a laboratory or clinician shapes to a patient's record.
- In the United States it files under 21 CFR 872.6200, Base plate shellac, at Class I (general controls), product code EEA.
- The US entry exempts the material from premarket notification subject to section 872.9 and, where it is not labelled or represented as sterile, from the quality management system requirements of part 820 except for records and complaint files.
- Canada names no shellac. Rule 3(a) of Schedule 1 places all denture materials at Class II, and Rule 15 provides that a material sold to a professional to be shaped for an individual takes the class of the finished device.
- The result is a real cross-border difference: the same sheet of shellac is Class I in the United States and Class II in Canada.
- Entries, classes, product codes and rule text below were checked against the eCFR, the consolidated Regulations and the openFDA classification database on 2026-10-14.
Base plate shellac is the material a dental laboratory or a clinician shapes to rebuild the occlusal rim of a denture or to build a temporary base. It is a sheet or a stick of material rather than a finished appliance, and that is precisely why the class question is more interesting than it looks. The United States files it in its own Class I entry. Canada applies two rules in sequence — one that puts every denture material at Class II, and one that gives a material sold to a professional the class of the device it becomes — so the same material leaves the two systems in two different classes. This article sets out both routes and what a laboratory records, with the three-layer dental bibs used at the same bench.
What is base plate shellac?
It is a material made of shellac, supplied as a sheet, a stick or a preformed plate, intended to rebuild the occlusal rim of full or partial dentures. In a laboratory it is warmed and shaped to a model or to a patient's record; in a clinical setting it can be adapted chairside for a temporary base or a record. It is worked by hand or by light heat and it sets as it cools, which is what makes it useful for a rim that has to be tried in the mouth before the final material is processed.
The distinction between a material and a finished appliance is the one the rules act on. A shellac plate is not yet a denture base; it is the article from which a denture base, or a rim, will be formed. Both systems regulate the material, but they arrive at the class differently, and the difference is worth knowing before an order is placed across the border.
Is base plate shellac a Class I device in the United States?
Yes. 21 CFR 872.6200 is titled Base plate shellac and the identification describes a device composed of shellac intended to rebuild the occlusal rim of full or partial dentures. The entry sits at Class I (general controls), exempts the material from the premarket notification procedures in subpart E of part 807 subject to the limits in section 872.9, and adds the sterility-linked carve-out from the quality management system regulation: a material that is not labelled or represented as sterile is exempt from part 820 except for the requirements on records and complaint files.
The openFDA device classification API lists product code EEA (Plate, base, shellac) under that regulation number. The entry is written around the material and the step it performs — rebuilding an occlusal rim — rather than around the finished denture, which is why one sheet of material and one cured denture sit in different entries.
| Item | Detail |
|---|---|
| US regulation | 21 CFR 872.6200 - Base plate shellac |
| US class | Class I (general controls) |
| Product code | EEA (plate, base, shellac) |
| Route to market | Exempt from premarket notification under subpart E of part 807, subject to the limits of section 872.9 |
| Quality-system carve-out | Exempt from part 820 except records and complaint files, where the material is not labelled or represented as sterile |
| Stated intended use | To rebuild the occlusal rim of full or partial dentures |
How does Canada classify base plate shellac?
Canada names no shellac, so two rules in Schedule 1 of the Medical Devices Regulations do the work, and the order they are read in matters. Rule 3(a) is the first: \"Despite rules 1 and 2 — (a) all denture materials and orthodontic appliances, and their accessories, are classified as Class II.\" A material intended to rebuild the occlusal rim of a denture is a denture material, so the material is Class II.
Rule 15 is the second, and it closes the gap that a material-only reading would leave. It provides that a medical device that is a material intended to be sold to a health care professional or dispenser for the specific purpose of configuration or arrangement into a mould or shape to meet the needs of an individual is classified in the class that applies to the finished medical device. Shellac sold to a laboratory or a clinician to be shaped for a patient is exactly that article, so its class is the class of what it becomes — a denture material — and Rule 3(a) fixes that at Class II. Read together, the two rules give one answer, and it is the same answer a laboratory would reach by asking what the material is for.
| Item | Canada | United States |
|---|---|---|
| Named entry | None; classified by rule | 872.6200 - Base plate shellac |
| Class | Class II (Rule 3(a) with Rule 15) | Class I (general controls) |
| Governing text | Schedule 1, Part 1, Rules 3(a) and 15 | 21 CFR 872.6200 |
| Would Rule 7(1) give Class I? | No; Rule 3(a) classifies denture materials, so the material is not one of the devices left to the non-invasive default | Not applicable |
| Route to market | Device licence (Class II) with quality-system evidence | Exempt from premarket notification, subject to section 872.9 |
Why do the two countries answer differently for the same material?
Because the two systems are put together differently. The United States regulates article by article, so a sheet of shellac has its own low-risk entry and a cured denture sits somewhere else. Canada regulates by rule, and one of those rules reaches the whole class of denture materials at once, so the material and the finished denture are pulled towards the same class rather than being separated by an entry.
| Material | What it is for | Class, Canada | Class, US |
|---|---|---|---|
| Base plate shellac | Rebuilding the occlusal rim of a denture | II (Rule 3(a) with Rule 15) | I (872.6200, EEA) |
| Denture reline material | Relining the fitting surface of a denture | II (Rule 3(a)) | II (872.3760 range) |
| Heat-cure denture base resin | Forming the finished denture base | II (Rule 3(a)) | II (872.3760 range) |
The practical consequence for a laboratory is not a different technique; it is a different paper trail. Where a material is Class II in Canada, the supplier's licence path rests on a quality system and on risk-management evidence, and the laboratory buying it should be able to point to the lot and the material certificate in the case file. That is the part of the difference that shows up in an audit, and it is the part worth carrying into the purchase order rather than into the bench technique.
What should a laboratory check before ordering?
Three checks. First, confirm the form and the melting behaviour the maker states, because a shellac that is worked at the wrong temperature will not hold the rim it was asked to hold. Second, confirm the lot and the material certificate that come with the delivery, since that is the record that ties a finished rim back to the material it was made from. Third, confirm which class the material carries in the country it is being ordered into, because a shellac line that is Class I in the United States is Class II in Canada, and the two answers lead to different documentation expectations.
A dental laboratory also reorders the bench and operatory consumables it uses on the same case. Clinics that stock for a whole practice can order through the wholesale programme and request a bulk quote for a standing or annual order; the three-layer dental bibs, 500 pack sits in the same catalogue. Consumables for this line are listed under dental practices. Reselling? become a distributor.
How does the class affect a laboratory's records?
The class sets the market-entry path; the record is set by the case. A rim or a temporary base is recorded with the case identifier, the material used and its lot, the shaping temperature or technique the maker states, the fit check and the date, so a finished appliance can be traced back to the material it was made from. Where the material is Class II in Canada, that traceability is also the evidence that the licensed material was used as intended.
Because shellac is formed by hand or by heat and then tried in the mouth, the routine also includes the handling and storage conditions the maker states and the point at which the material is discarded rather than reworked. None of that changes with the class; it is the ordinary routine of a dental laboratory, and the record is what shows the material was used as the maker intended.
Sources
- openFDA device classification API
- Medical Devices Regulations, SOR/98-282, full text and Schedule 1
- US FDA, medical device databases
- US FDA, overview of device regulation
- Health Canada, medical devices
- Health Canada, establishment licensing
- Royal College of Dental Surgeons of Ontario, standards and guidelines
- Canadian Dental Association
- Public Health Ontario, infection prevention and control
- World Health Organization, oral health
- Standards Council of Canada
- CSA Group
- ISO 13485:2016, medical devices quality management
- ISO 14971:2019, application of risk management to medical devices
- CCOHS, OSH answers
- Health Canada, medical device licence application guidance
A material traceability sheet for the bench. Case number, material lot, shaping temperature and the fit check belong on one page that goes into the case file. Open the compliance log centre and print the blank — no account and no sign-up, and the laboratory can take as many copies as it runs cases.
One layout, dated for the month. Enter the laboratory name, the bench and the case list once, and the sterilization log generator returns dated lines you can print or file straight into the quality manual.
Ask a compliance specialist. A classification question usually turns on how the device is used, not only on its name. Ask a compliance specialist — you get a written answer specific to your equipment and province, with the regulation or standard it is based on cited.
Related reading
- Denture reline materials in Canada vs the US
- Dental articulators in Canada vs the US
- Orthodontic supplies in Canada vs the US
CliniEco Medical supplies eye care, laboratory and dental consumables of the kind described in this article. MDEL #35334. This article is written for optometry, laboratory and dental procurement professionals and is not legal advice; the class of a device and the records a practice keeps belong to the manufacturer and to the requirements that apply to it.
Frequently Asked Questions
What class is base plate shellac in the United States?
Class I, under 21 CFR 872.6200, base plate shellac, product code EEA, exempt from premarket notification subject to the limits of section 872.9.
What class is it in Canada?
Class II. Rule 3(a) of Schedule 1 places all denture materials at Class II, and Rule 15 gives a material sold to a professional for shaping into an individual device the class of the finished device.
Why is the same material Class I in one country and Class II in the other?
The United States files one entry per article, so a sheet of shellac has its own low-risk entry. Canada classifies by rule, and the rule covering denture materials reaches the whole family at once.
Does the sterility carve-out change the Canadian class?
No. The part 820 carve-out in the US entry turns on whether the material is represented as sterile. The Canadian class is derived from Rule 3(a) and does not turn on sterility.
What does Rule 15 do?
It provides that a material intended to be sold to a health care professional or dispenser for the specific purpose of configuration into a mould or shape to meet an individual's needs is classified in the class that applies to the finished device.
What else is base plate shellac called?
It is also written as shellac base plate, baseplate shellac, occlusal rim shellac and shellac plate; the US regulation describes the same article as a device composed of shellac intended to rebuild the occlusal rim of full or partial dentures.
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