| 摘要 |
A screw device for orthodontic treatment is formed with a platform part that has a relatively large radial width between a head part and a screw-body part of the screw device, and a neck part that has a radial width smaller than that of head part is also formed between the platform part and the head part. Therefore, a hook ring at the end of a spring (or rubber band) used for orthodontic treatment may be directly fitted from the head part and be positioned at the neck part without worrying about being dropped off. The thickness of the platform part may prop the spring up the gingiva for keeping from friction. By screwing the screw-body part into the maxilla (or mandible) to make the platform part abutted against the maxilla (or mandible), not only may a stable screwing force be provided for securing the screw, but also does the side surface of the platform have a function of facilitating the gingiva tissue to grow, so the healed-over wound will be more even and good looking. The screw-head part of the invention may be arranged with slot for providing an accommodation for the orthodontic archwire. The screw of the invention not only may provide a hook-hanging mechanism for the spring, but also have a function for supporting the orthodontic archwire.
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