Patent ID: 7172416

Claim:
A screw device for orthodontic treatment comprising: a screw-body part having a diameter with external threads extending a length; a platform part axially aligned and integrally formed with the screw-body part, the platform part further having: a flat top plane perpendicular to the screw-body part; and an outer periphery being a smooth surface without threads thereon; and a head part connected on the flat top plane of the platform part wherein the head part is detachable from the platform part and further includes an accessory member for assisting orthodontic treatment, the accessory member comprising a cube having a plurality of flat side surfaces adapted for adhering an additional component to one of the flat side surfaces to assist orthodontic treatment; and threads of the screw-body part are divided into at least a first thread portion located near to the platform part and a second thread portion located away from the platform part, wherein the threads of the first thread portion are designed to have relatively narrower width and smaller pitch, while the threads of the second thread portion have wider width and larger pitch.