title: The application of Moire magnification to high-resolution studies of human premolar eruption.
abstract: The optical phenomenon of Moire magnification can be used to provide real-time measurements of the position of an erupting human premolar, with a resolution of 0.1 micron or better. A new instrument for this purpose, which allows repeated measurements in the same individual, is described. Cyclic changes in the position of the erupting tooth in concert with the heartbeat, with a magnitude of 0.05-0.35 micron, can be discerned. An unusual cyclic rhythm, with a period of 20-50 s, was observed.
authors.affiliation: Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill 27599-7450, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Trentini
authors.forename: W H
authors.initials: WH
authors.lastname: Brown
authors.forename: R L
authors.initials: RL
authors.lastname: Paterson
authors.forename: W R
authors.initials: WR
authors.lastname: Proffit
mesh_terms: D001641:Bicuspid / Q000502:physiology*; D002648:Child; D006339:Heart Rate; D006801:Humans; D007091:Image Processing, Computer-Assisted; D015903:Moire Topography / Q000295:instrumentation; D010507:Periodicity; D014078:Tooth Eruption / Q000502:physiology*