Document Detail

Evidence for a neural influence on tooth germ generation in a polyphyodont species.
MedLine Citation:
PMID:  8088427     Owner:  NLM     Status:  MEDLINE    
It has been suggested that nerve endings emanating from the dental nerve plexus of the jaw might be involved in the formation of tooth germs. In the present study we examine the effect of unilateral denervation on the formation of tooth germs in the lower jaw of a polyphyodont teleost--the cichild Tilapia mariae. Repeated inspection of the lower jaw dentition in normal animals over a period of about 300 days showed that the functional time of an average individual tooth is 101 days. In operated animals, the functional time was normal on the unoperated side, but on the denervated side tooth turnover ceased about 100 days after surgery. Radiographic plates from lower jaw specimens revealed that mineralized replacement teeth were present on the unoperated side, but not on the denervated side, 300 days after denervation. Light microscopic examination of semi-thin transverse sections from decalcified plastic-embedded lower jaws showed that soft-tissue tooth primordia and nerves were lacking on the denervated side, while present within the undisturbed half-jaw. It is concluded that the local presence of mandibular nerve branches is necessary for the formation of tooth germs in the lower jaw of the cichlid T. mariae.
F Tuisku; C Hildebrand
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Developmental biology     Volume:  165     ISSN:  0012-1606     ISO Abbreviation:  Dev. Biol.     Publication Date:  1994 Sep 
Date Detail:
Created Date:  1994-10-19     Completed Date:  1994-10-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372762     Medline TA:  Dev Biol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1-9     Citation Subset:  IM    
Department of Cell Biology, Faculty of Health Sciences, University of Linköping, Sweden.
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MeSH Terms
Fishes / growth & development*
Jaw / innervation,  ultrastructure
Mandibular Nerve
Microscopy, Electron, Scanning
Tooth Germ / growth & development*,  innervation*

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