Patent ID: 8209876

Claim:
A device for measuring the skeletodental relationship of the human skull directly from a cephalometric radiograph of the craniofacial structure, said device comprising: a flat transparent plate-like structure having a generally rectangular shape with a length of about 257 mm, a width of about 160 mm and a thickness of about 3 mm, with a zero point and an image of two protractors superimposed on said zero point and including radial lines from 0° to 90° for a first of the protractors and from 90° to 0° for a second of said protractors and wherein said 0° line in said first protractor is parallel to said 90° line in said second protractor and said 90° line in said first protractor is parallel with said 0° line in said second protractor; and which includes an image of a dental arch symmetry and three scales with a first vertical millimeter scale on an upper right hand edge of the device and a horizontal millimeter scale on an upper edge on the right hand portion and a second vertical scale on a lower right hand portion of the device.