Document Detail

Continuous overnight observation of human premolar eruption.
MedLine Citation:
PMID:  9022915     Owner:  NLM     Status:  MEDLINE    
Such observation was made possible by transmitting the image of a mobile ceramic ruling on the erupting maxillary second premolar to a video-microscope via a coaxial fibreoptic cable. The cable was inserted into a reference bar secured to the adjacent first molar and first premolar. The image of the ruling was superimposed with the image from a surveillance camera focused on the patient and continuously recorded on video-tape along with the participant's blood pressure, pulse rate, electromyographic activity and occlusal contact sounds. Overnight data from 12 individuals clearly revealed a circadian rhythm in eruption during the prefunctional spurt. On average, the maxillary second premolar erupted 41 microns during an 11-h overnight observation, with almost all the eruption occurring in the late evening from 8 p.m. to 1 a.m. After 1 a.m., eruption typically ceased, with a tendency for intrusion to occur until 7 a.m. Sleep increased the rate of eruption during the late evening, but did not influence the eruption rate during the early morning. Haemodynamic changes, including blood pressure and pulse rate, did not have a significant impact on the rhythm of eruption. The observed eruption rhythm is most probably caused by changing hormone levels and their effect on the periodontal ligament. The late-evening eruption of human premolars coincides with the late-evening secretion of growth hormone and thyroid hormone typically found in humans.
R K Risinger; W R Proffit
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of oral biology     Volume:  41     ISSN:  0003-9969     ISO Abbreviation:  Arch. Oral Biol.     Publication Date:    1996 Aug-Sep
Date Detail:
Created Date:  1997-04-14     Completed Date:  1997-04-14     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0116711     Medline TA:  Arch Oral Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  779-89     Citation Subset:  D; IM    
Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill 27599-7450, USA.
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MeSH Terms
Bicuspid / growth & development*
Circadian Rhythm
Fiber Optic Technology
Human Growth Hormone / secretion
Microscopy, Video
Sleep / physiology
Thyroid Hormones / secretion
Tooth Eruption / physiology*
Reg. No./Substance:
0/Thyroid Hormones; 12629-01-5/Human Growth Hormone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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