title: Tooth position measurements on dental casts using holographic images.
abstract: A new accurate method for comparing tooth positions on dental casts at different stages is described. Holograms of casts were prepared with a helium-neon gas laser. For evaluation of tooth movements, a cast and hologram representing different time points were superimposed by means of an adjustable x-y stage. Occlusal surface detail was used as a reference for the superimposition. Positional changes of the upper incisors were detected as discrepancies between the cast and the hologram image.
mesh_terms: D000328:Adult; D003724:Dental Arch / Q000033:anatomy & histology; D006696:Holography; D006801:Humans; D007834:Lasers; D008875:Middle Aged; D003765:Models, Dental; D014070:Tooth / Q000033:anatomy & histology*; D014087:Tooth Movement Techniques