| 摘要 |
PROBLEM TO BE SOLVED: To provide a lingual orthodontic bracket preventing from coming into one-point contact with a largely curved part of an arch wire.SOLUTION: In a lingual orthodontic bracket 1, a central part 23 of a slot bottom face 4a is formed into a relatively recessed shape with respect to end parts 11 and 12 at both sides in the slot length direction. This configuration can avoid one-point contact where a curved part of an arch wire W comes into contact with the central part 23 of the slot bottom face 4a, and can form two-points contact state where it comes into contact with both-side end parts 11 and 12. This configuration can surely and easily perform a rotation control of an anterior tooth so as to reduce friction between the arch wire and the lingual orthodontic bracket 1 and enhance the speed of moving the anterior tooth. |
