Orthodontic expansion screw appliance

摘要

An orthodontic expansion screw appliance for being secured to first and second areas of a patient's teeth. The appliance includes a first screw body attached relative to the first area of the patient's teeth; a second screw body attached relative to the second area of the patient's teeth; a screw spindle having a threaded first end for being screwed to the first screw body and having a threaded second end for being screwed to the second screw body; rotation of the screw spindle causing the first and second screw bodies to move relative to one another; and fill structure coating the threaded first and second ends of the screw splindle for preventing the externally threaded first and second ends of the screw spindle from inadvertently rotating relative to the screw bodies.