| 摘要 |
An orthodontic bracket for attaching an archwire to a tooth including a body including a bonding base for attachment to the tooth, the body having an occlusal-gingivally extending opening, a lingual vertical slot, a pair of laterally spaced gingival tie wings and a pair of laterally spaced occlusal tie wings, the gingival and occlusal tie wings projecting from a labial surface of the body. An archwire slot is provided extending mesiodistally across the body and between the gingival and occlusal tie wings at opposed medial and distal sides of the body to accommodate the archwire. A locking shutter including at least one resilient arm member at one end and a retaining portion at another end is provided such that the locking shutter moveable between an open position in which placement and removal of the archwire is facilitated and a closed position in which placement and removal of the archwire is inhibited. There is further provided a retaining groove formed in an occlusal wall of the gingival tie wings for releasably retaining a retaining portion of the locking shutter in the closed position and, at least one blocker for preventing movement of the archwire out of the archwire slot and into the retaining groove. In addition, a broader locking shutter is possible that prevents a sharp bend in the archwire to prevent notching or bonding of the archwire during early tooth movement and sliding of teeth during mid-term treatment tooth movement. |
