Unicode's Miscellaneous Technical block encodes a bunch of dentistry symbols:
It looks like the first and last two are used in Palmer notation. What are the rest of them used for? What do the circle, triangle, and tilde mean?
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A triangle with a bar indicates an artificial spacer, especially on a denture, a circle with a bar indicates a supernumerary tooth, and a tilde with a bar indicates an abbreviation for a group of teeth.
It also says that this is notation used by the dental insurance claim system in Japan.