| 摘要 |
The orthodontic appliance includes the usual band fitted around the tooth, a pair of T-shaped brackets with an aligned groove for placing the arch wire; a ligating element having a flat base and a button on top is placed on the brackets to hold the arch wire; the ligating element is fastened to the brackets by means of wires welded to the bottom of the ligating element; an elastic band can be fastened to the button as well as to the button on a ligating element analogously tied to another tooth.
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