Written and maintained by CASRAI Editorial Board
Last updated
General product and regulatory information only. This page is not medical advice and does not describe how any instrument is used on a patient.
Short answer
A dental explorer is a hand-held dental instrument with a fine, pointed working tip. In the US it is regulated as an “operative explorer” (FDA product code EKB), a Class I device under 21 CFR 872.4565. Explorer “types” are mostly manufacturer numbers and shapes such as #5, #11, #3A or 11-12, and the numbers are not set by the regulation.
Definition and scope
The FDA regulation for dental hand instruments, 21 CFR 872.4565, defines the category as “a hand-held device intended to perform various tasks in general dentistry and oral surgery procedures.” The regulation lists “operative explorer” and “mouth mirror” among the devices it covers, together with the periodontic probe, periodontic scaler, dental retractor and dental depth gauge instrument (Cornell LII text of 21 CFR 872.4565, checked 2026-10-30).
The regulation classifies the whole group as Class I (general controls). It adds that a device made of the same materials used before May 28, 1976 is exempt from the premarket notification procedures in subpart E of part 807, subject to the limitations in 21 CFR 872.9.
The openFDA classification database lists the two instruments separately, both under regulation 872.4565, Class I, specialty Dental:
- “Explorer, Operative”, product code EKB
- “Mirror, Mouth”, product code EAX
How explorers and mouth mirrors are described and reprocessed
The regulation and the classification records say what the devices are, not how to use them, and this page does not give technique. What the public records do show is how makers describe their explorers. In the FDA-hosted device identification records, one maker describes its PDT 11-12 explorer as “designed for calculus detection,” with tighter bends and curvature that “allow for more adaptive, interproximal access.” Another describes its PDT 2 explorer as having a contra angle, making it a tighter-radius explorer, “also commonly referred to as a ‘pigtail.'” (openFDA UDI records, checked 2026-10-30.)
For reprocessing, the CDC’s dental infection control summary on sterilization and disinfection names mouth mirrors as an example of a semicritical item, meaning an item that contacts mucous membranes or non-intact skin. It states that because most semicritical dental items are heat-tolerant, they should be sterilized using heat, and that cleaning should always occur before disinfection or sterilization. Cleaned, dried instruments are inspected, wrapped, packaged or placed into container systems, and packages are labeled with the sterilizer used, the cycle or load number and the date (CDC, checked 2026-10-30). The CDC summary names mouth mirrors as its example; the explorer is not named there.
For background on the equipment involved, see CASRAI’s guides to what an autoclave is and sterilization technology.
Explorer listings you will see in device records
The table below uses real listings from the device identification records, not a universal numbering chart. It shows how the same instrument family is named differently by each maker. No brand is recommended here.
| Listing name in the record | Maker | What the record shows |
|---|---|---|
| Explorer Double End #5 | Advance Dental Products | Filed under product code EKB |
| Explorer, DE, Briault #11 | Nordent | Filed under product code EKB |
| #3A SE Explorer | Hu-Friedy | Filed under product code EKB; the listing name includes “SE” |
| Explorer 8SY | Hu-Friedy | Filed under product code EKB |
| Explorer Single Ended Delicate 160mm | Aesculap | Filed under product code EKB; length given in the name |
| PDT 2 Explorer | PDT | Contra angle, tighter radius, commonly called a “pigtail” |
| PDT 11-12 Explorer | PDT | Designed for calculus detection; tighter bends for interproximal access |
| Explorer/Probe Williams #17 | BMT | Filed under product code HXB, not EKB |
All the listed records are marked as not single-use (reusable). The records come from openFDA’s UDI endpoint, checked 2026-10-30; a given manufacturer’s current catalog may differ.
Where it matters for labs, clinics and supply decisions
Anyone matching a catalog entry to a record, a requisition or a reprocessing log has three separate labels to keep apart: the maker’s number or name (#5, #11, 11-12), the FDA product code (EKB for an operative explorer, EAX for a mouth mirror), and the regulation (872.4565). The maker’s number identifies a shape in that maker’s own range. The product code and regulation identify the regulatory category, and they are the same across makers for an operative explorer.
The BMT listing shows why the product code is worth checking. A “#17” explorer/probe appears under HXB, which the FDA classification database lists as “Probe”, Class I, under regulation 888.4540 (orthopedic), rather than under EKB. A search on EKB alone will therefore miss some instruments that are sold as explorers. For other hand instruments filed in the same regulatory family, see the Freer elevator guide, and for the research side of the field, what dental research is.
Common misunderstandings
Explorer numbers are universal
They are not defined in the FDA regulation. The regulation names “operative explorer” as a device type and sets no number scheme. The records above show numbers (#5, #11, #3A), letter codes (8SY) and names (Williams, delicate) used side by side, so the same number from two makers should not be assumed to be the same shape.
An explorer and a probe are the same record
The regulation lists the operative explorer and the periodontic probe as separate devices within 872.4565. The BMT record shows that an instrument named for both can be filed under a different code altogether.
Class I means no requirements
Class I means general controls. The premarket notification exemption in 872.4565 applies only if the device uses the same materials as before May 28, 1976, and is subject to the limitations in 21 CFR 872.9.
FAQ
What is a dental mirror?
A mouth mirror is a hand-held dental instrument named in 21 CFR 872.4565 and listed by the FDA under product code EAX as “Mirror, Mouth”, Class I. The CDC gives mouth mirrors as an example of a semicritical item that should be heat sterilized when it is heat-tolerant.
What are the types of dental explorer?
The regulation recognizes one device type, the operative explorer (EKB). Within it, makers sell single-ended and double-ended designs and shapes identified by their own numbers and names, as the table shows, including tighter-radius “pigtail” and calculus-detection patterns.
Are dental mirror sizes, parts and size charts set by the FDA?
The classification regulation does not publish a size chart or part list for mouth mirrors or explorers. Dimensions and components come from the individual manufacturer’s product literature and instructions for use.
Are dental explorers reusable?
The device identification records for the explorers listed above are marked as not single-use. Reprocessing for a specific instrument follows the manufacturer’s instructions for use together with CDC guidance.
Sources
- 21 CFR 872.4565, Dental hand instrument, law.cornell.edu, checked 2026-10-30.
- openFDA device classification API, product codes EKB, EAX and HXB, api.fda.gov, checked 2026-10-30.
- openFDA device UDI records (AccessGUDID data), api.fda.gov, checked 2026-10-30.
- CDC, Sterilization and Disinfection (dental infection control), cdc.gov, checked 2026-10-30.
