Orthodontic Technicians Association
The Orthodontic Technicians Association (UK) (OTA) is the professional body that represents orthodontic technologists, based in the United Kingdom. == History == In 1971, orthodontic technicians based at London teaching hospitals began holding meetings to discuss the regulation of orthodontic technology, and the ways in which standards in the profession could be improved.
Source: Wikipedia — Orthodontic Technicians Association (CC BY-SA 4.0)