Measurement is quiet, precise work that underpins everything from orthodontic set-up to crown clearance. The instruments are simple, but using the right one — and reading it correctly — is where accuracy comes from. Here are the five measuring tools worth knowing and where each belongs.
1. The Boley gauge
A sliding caliper with a vernier or dial scale, the Boley gauge is the lab and clinic workhorse for tooth width, arch measurement and model analysis. Our precision Boley gauge reads down to fine increments for model work.
2. Castroviejo calipers
Fine, spring-loaded calipers for small linear measurements — the kind of precise gap and dimension checks where a Boley gauge is too coarse. The Castroviejo calipers with a 0–20 mm scale are the instrument for delicate measurement.
3. Crown and wax gauges
A spring-loaded crown gauge checks the thickness of wax patterns and crowns before casting or fitting. The spring crown gauge reads thickness directly so you can confirm clearance — exactly the check the plaster-room and casting guide relies on.
4. Specialist gauges: bracket height and endo
- Bracket-height gauge — sets consistent bracket position during bonding; the aluminium bracket-height gauge steps from 3.5 mm to 5.0 mm.
- Endodontic finger gauge — sets and checks file working length chairside; the autoclavable endo finger gauge keeps the reference at the fingertip.
5. Reading a measurement accurately
Three habits keep measurement honest: close the jaws gently to the same light contact each time; read a vernier square-on to avoid parallax error; and check the zero before you trust a reading. A gauge that has been dropped and sprung will read confidently and wrongly.
6. Provenance and care
Our gauges and calipers are made under ISO 13485:2016, and those classed as devices are CE-marked Class I — see the compliance page. A measuring instrument is only as good as its calibration and joint: keep slides clean and free of debris. These tools live in our examination & diagnostic range; for the basics of the tray, see setting up a dental examination tray and the wider buyer’s guide.
Related reading
- The dental instruments buyer’s guide — how to judge steel, joints and finish, plus provenance and care — the guide that ties the range together.
- Mouth mirrors and retraction — seeing and accessing the field you are measuring.