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[Histological study on root resorption of upper permanent incisor]
Shoni Shikagaku Zasshi. the Japanese Journal of Pedodontics
|January 1, 1989
Summary
Ectopic canine eruption caused severe root resorption in permanent incisors, extending into enamel. Histological analysis revealed unique resorption lacunae and hard tissue repair, with no odontoclasts observed.
Area of Science:
- Dentistry
- Oral Biology
- Histopathology
Context:
- Permanent teeth typically do not undergo physiological root resorption.
- Inflammatory root resorption can be triggered by factors like orthodontic forces and ectopic eruption.
- Ectopic eruption of a canine tooth can significantly impact adjacent incisors.
Purpose:
- To investigate the morphological and histological changes of root resorption in permanent incisors caused by ectopic canine eruption.
- To analyze the characteristics of resorption lacunae and the repair mechanisms involved.
Summary:
- Examination of a 12-year-old female's incisors revealed almost complete root resorption, even extending into the enamel, due to ectopic canine eruption.
- Two types of resorption lacunae were identified: one in direct contact with resorption tissue and another repaired with cementum-like tissue.
- No odontoclasts were found in the resorption lacunae; pulp tissue remained normal, and internal resorption was absent.
- Significant hard tissue formation occurred within the root canal and secondary cementum deposition on the external root surface.
- Scanning electron microscopy showed clear dentine tubules in resorption lacunae and shallow lacunae with hard tissue deposition, indicating varying stages of repair.
Impact:
- Provides detailed histological insights into inflammatory root resorption caused by ectopic tooth eruption.
- Highlights the reparative potential of hard tissues in response to root resorption.
- Contributes to understanding the complex biological responses in dental anomalies.