English translation: face bow (dentistry) ; face bar (sports)
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Explanation: Source: Dental Lexicon, 2nd ed., compiled and published by the Fédération Dentaire Internationale.
The following little tidbit comes from www.zahngesund.de:
Gesichtsbogen - Übertragungsgerät zur schädelbezogenen Rekonstruktion mittels Registraten der Kieferabdruckmodelle in einem Artikulator. See complete URL below.
Explanation: I know this to be correct, from recently watching my teenage son undergo all the treatment (in Britain) - the equipment in question, the flexible peice of wire which forms part of the "brace", - was German-made! A useful orthodontics site is to be found at the "braces" URL below. There's also a glossary at the 2nd site lisetd.