Brackets for orthodontics. Connecting the arch-wire on brackets with wire. Also note the bracket that has an extra knob, to mount elastic bounds from upper to lower jaw, to press the tooth down (inwards). The photo was taken the 23rd December 2005 by Håkan Svensson (Xauxa), on a plastic model.
No machine-readable author provided. <a href="//commons.wikimedia.org/wiki/User:Xauxa" title="User:Xauxa">Xauxa</a> assumed (based on copyright claims).
CC BY 2.5
No machine-readable source provided. Own work assumed (based on copyright claims).