Orthodontic appliance for children's dental crossbite and a preparation method thereof

An orthodontic appliance for children's dental crossbite, including a nickel-titanium archwire for upper teeth, a steel archwire for lower teeth, two upper bands, two lower bands, two rubber bands, and a plurality of brackets;

• the nickel-titanium archwire is U-shaped, U-shaped springs are welded near both ends;
• the steel archwire is U-shaped, with a first traction hook and a second traction hook arranged on left and right of a front part;
• the upper bands are provided with buccal tubes, and left and right buccal tubes are provided with a third traction hook and a fourth traction hook;
• the upper bands are sleeved on first permanent molars of upper teeth, and the third traction hook and fourth traction hook are located on an upper part of the buccal tubes;
• the lower bands are sleeved on first permanent molars of lower teeth;
• the brackets are bonded to crossbite teeth of upper teeth and four anterior teeth of the lower teeth;
• both the nickel-titanium archwire and the steel archwire are ligated in several brackets;
• both ends of the nickel-titanium archwire are threaded into the buccal tubes of the upper bands;
• the opening of the U-shaped springs face downward;
• one end of the U-shaped springs close to the buccal tubes is a movable end, and one end of the U-shaped springs far from the buccal tubes is a welded end;
• both ends of the steel archwire are threaded into the buccal tubes of the lower bands;
• the first traction hook and second traction hook are close to corresponding lateral incisors and face upward;
• the left rubber band hooks and pulls the first traction hook and the third traction hook, and the right rubber band hooks and pulls the second traction hook and the fourth traction hook;
• the two rubber bands are pulled in an inverted V shape.