Self-ligating bracket, double-wing spacing adjustable bracket and dental appliance

A self-ligating bracket, comprising:

• a bracket base plate;
• a first elastic support, wherein a first end of the first elastic support is connected to the bracket base plate;
• a bracket body, wherein the bracket body has a hollow structure, a second end of the first elastic support is connected to a distal end of the bracket body, and the distal end of the bracket body is provided with a distal-end gap and the distal end of the bracket body is expanded radially by the second end of the first elastic support;
• and
• a position-limited member, wherein the position-limited member is movable in an axial direction of the bracket body, and the position-limited member is sleeved on an outside of the bracket body for overcoming elastic force provided by the first elastic support and making the bracket body contract in a radial direction;
• wherein the position-limited member is a threaded member, the outside of the bracket body is provided with an axial external thread, the threaded member is provided with an internal thread matching with the external thread, and the threaded member is engaged with the bracket body through the internal thread and the external thread.