Dentistry notation symbols

[Ryusei Yamaguchi]

I've found some documents about dental formula used in Japan. (I'm not a dentist, so the translation of technical terms may be incorrect.)

Dentists in Japan use modified Zsigmondy-Palmer notation. [1] The notation is used in medical receipts or academic papers and preferred because of its intuitiveness.

[2] shows a modified notations used in electronic receipts:

①: 支台歯 abutment tooth
（①）: 便宜抜髄支台歯
△: 隙 diastema

⏇ and ⏈ are used for ellipsis across 正中 (center) [3][4].

[5] is an app to input dental formula, which supports Unicode format output.

[1] 歯科領域の標準化 ―海外の状況と日本の標準マスターの位置付け―
(Standardization in Dentistry in Japan―Situation of Overseas and Consideration of Japanese Standard Masters form the Position of International Trends―)
https://www.jstage.jst.go.jp/article/jami/34/4/34_183/_article/-char/ja/

[2] 電子レセプトの作成手引き
(Guide to Creating Electronic Receipts)
https://www.ssk.or.jp/seikyushiharai/rezept/iryokikan/iryokikan_02.files/jiki_d01.pdf

[3] 歯式の記載について
(About Notation of Dental Formula)
http://endai.umin.ac.jp/endai/jss57/jss_sisiki.htm

[4] 歯式について
(About Dental Formula)
https://ehiro-shika.com/blog_articles/1604298267.html

[5] カルテメーカー/歯式メーカー
https://www.kartemaker.com/shishiki/

Ryusei

> 2022/04/09 3:26、Jonathan Chan via Unicode <unicode at corp.unicode.org>のメール:
> 
> What are code points U+23BE..U+23CC in Miscellaneous Technical used for?
> 
> ⎾⎿⏀⏁⏂⏃⏄⏅⏆⏇⏈⏉⏊⏋⏌
> 
> They're all named DENTISTRY SYMBOL LIGHT..., and the Standard only says they're for dental notation:
> 
> Dental Symbols. The set of symbols from U+23BE to U+23CC form a set of symbols from JIS X 0213 for use in dental notation.
> 
> According to Wikipedia the first two and the last two are used in Palmer notation <https://en.wikipedia.org/wiki/Palmer_notation>, but it doesn't explain what the rest of them are used for. The only historical document I could find with some sort of explanation is document N2195 <https://www.unicode.org/L2/L2000/00098-n2195.pdf>, but it only explains how they're used and not what they're meant to represent, why they need to exist, or what the circle, triangle, and tilde mean. Based on some cursory searching it doesn't seem like those symbols are standard in modern dental notation either.
> 
> Jonathan

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