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Journal of Dental Research, Vol 70, 15-18, Copyright © 1991 by International & American Associations for Dental Research Online Journals

ARTICLES

Video microscope observations of human premolar eruption

W. R. Proffit, J. R. Prewitt, H. S. Baik and C. F. Lee
Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill 27599-7450.

It is now possible to observe with an accuracy of 1-2 microns the pattern of eruptive movements of a human premolar as it moves from gingival emergence to the occlusal plane. This was accomplished by use of a video microscope to track the position of an optical ruling on the erupting tooth relative to a reference ruling mounted on adjacent teeth that were in occlusion. Net eruptive movements averaging 25-75 microns occurred from one day to the next until the tooth was almost in occlusion; then the eruptive rate slowed. Eruption occurred almost entirely at night. During the day, there was a marked slowing or cessation of eruption and often intrusion, which appeared to be related to masticatory activity.




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