Patent ID: 7125250
Filing Date: 2006-10-24
Classification: A61C

Abstract:
1. A screw device for orthodontic treatment comprising: a screw-body part having a diameter with external threads extending a length wherein the screw-body part is tapered at a section away from a platform part and the tapered section of the screw-body part has a tapering angle of 2˜10 degrees, and the external threads of the screw-body part are slightly loosened at a portion away from the platform part and relatively concentrated at another portion near the platform part; the platform part axially aligned and integrally formed with the screw-body part, the platform part having: a head part which is detachable from the platform part, the head part having: wherein the accessory member is exposed outside of the platform part when the second mating structure engages with the first mating structure.