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Development of sensory innervation in dentin
The Journal of Comparative Neurology
|June 1, 1980
Summary
Adult dentinal nerve location is determined by nerves being enclosed in tubules during tooth development and lost through wear. Dentin innervation density increases with tooth maturation, enhancing sensitivity.
Area of Science:
- Neuroscience
- Dentistry
- Developmental Biology
Background:
- Understanding dentinal innervation is crucial for comprehending tooth sensitivity and pain mechanisms.
- Previous research has focused on nerve presence but less on the dynamic processes shaping their adult location.
Purpose of the Study:
- To investigate the developmental processes that establish and modify the location of dental nerves within dentin.
- To elucidate the mechanisms behind adult dentinal nerve positioning and its relation to tooth maturation.
Main Methods:
- Axonal transport of radioactive protein was used to label dental nerves in rat molars.
- Autoradiography was employed to visualize nerve distribution in developing and mature dentin.
- Nerve position was analyzed in relation to dentin growth lines.
Main Results:
- Two key processes were identified: enclosure of nerves within dentinal tubules during dentinogenesis and nerve loss due to attrition.
- Nerve enclosure begins at the pulp horn tip and progresses coronally, establishing innervation up to 160 microns into dentin.
- Reparative dentin formation replaces nerves lost through attrition, while new innervation occurs in apical regions.
Conclusions:
- Adult dentinal nerve location is a dynamic result of developmental enclosure and wear-related loss.
- There is a long-term association between nerve endings and specific sites within dentinal tubules.
- Findings in rats suggest similar developmental patterns in human teeth, with increased innervation correlating with heightened sensitivity in mature teeth.