Screw mounting for a replacement tooth, at a tooth stump or dental implant, has a screw with opposing right and left threads at the inner and outer threadings

摘要

The mounting screw for an artificial tooth locks the primary section into the tooth stump or tooth implant, and the secondary section into the replacement tooth. The screw inner and outer threadings are partially in a left thread and partially in a right thread. The ratio of the right thread to the left thread, expressed as a fraction of the screw length, is 1//2:1//2 to 1//4:3//4.