Holodent system: a new technique for measurement and storage of dental casts
Hans Rydén, Birgit Mårtensson · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1990
A system for producing holograms and for three dimensional measurement of dental casts is described. Measurements were performed on a metal testpiece with sharp welldefined contours and on a dental cast. Measurement of the testpiece gave a precision of 0.02 0.11 mm for x, y and z coordinates. Corresponding figures for the dental cast were 0.03 0.43 mm. Precision was higher for the testpiece than for the dental cast, highest for the x and y coordinates and satisfactory for the z coordinates. No difference was found if the hologram was superimposed on the object or two holograms were superimposed on each other. Holograms of dental casts solve storage problems by replacing space consuming models.