Dentistry – Orthodontics – Bracket
Patent
1998-05-07
1999-05-25
Wilson, John J.
Dentistry
Orthodontics
Bracket
433 10, 433 13, A61C 300
Patent
active
059064862
ABSTRACT:
An orthodontic bracket comprises a spring ligating member comprising a thin flat metal strip that embraces the bracket body and is moved thereon between slot closed and open positions. At least the free end part of the spring member labial arm portion that closes the slot is of smaller width in the mesial distal direction than the arch wire slot gingival surface which is provided with a recess of smaller mesial distal width so that it is closed at its mesial and distal ends. The free end part of the labial arm portion extends into the recess to protect the spring member against excessive movement in the labial direction, while the arch wire slot gingival surfaces at the closed mesial and distal ends of the recess are engagable by an arch wire in the slot for application of maximum torque moment from the arch wire to the bracket. The bracket also comprises a labial lingual extending passage in the spring member labial arm portion permitting insertion of a tool for moving the spring member from the slot closed to the slot open position. The bracket body is provided with a slot registering with the passage that enables the tool to engage the spring member occlusal portion thereby permitting the required movement without overstressing the spring member.
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