Abstract: A set of guides are provided for setting up upper and lower artificial teeth on models. Each guide is a strip of flexible, non-elastic material. A center line is formed on each guide with a millimeter scale extending laterally therefrom on each side. The range or average width of the first anterior tooth is marked on each side of the center line, the range of the widths of the three anterior teeth on each side is marked on the guide, and the range of the widths of the four posterior teeth on each side is marked on the guide. An additional thickness is preferably formed at the top center of each strip, the additional thickness having two integral lobes intersecting at a downward facing angle at the center line to rest on the phrenum of a model. Generally longitudinal height lines parallel to each other are inscribed along the upper edge of each strip, and each guide strip has means provided to have it circle a model.

Abstract: A scanning device has mirrors which reflect a beam of light between them to pass successively through the lasing medium of a laser. The beam is slightly deflected on each path between the mirrors to scan a pattern and the beam is amplified with each passage through the laser. One mirror is partially reflective and partially transparent so the pattern determined by the reflective path of the light beam between the mirrors passes beyond the mirrors to be modulated for information storage, information retrieval, and other uses. One embodiment of the invention has two parallel mirrors with the beam slightly angled to be reflected back and forth along a row and wedge shaped deflectors fixed to the mirrors to shift the beam to another row so that the beam scans a pattern as it emerges from one of the partially transparent mirrors.