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Updated: Feb 14, 2026

A Simple Chamber for Long-term Confocal Imaging of Root and Hypocotyl Development
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Root migration pattern after third molar coronectomy: a long-term analysis.

Y Y Leung1, K Y Cheung1

  • 1Oral and Maxillofacial Surgery, Faculty of Dentistry, The University of Hong Kong, Hong Kong.

International Journal of Oral and Maxillofacial Surgery
|February 14, 2018
PubMed
Summary
This summary is machine-generated.

Coronectomy for impacted lower third molars can cause root migration, primarily within the first year. Migration slows significantly after 24 months, with age being a key factor influencing the rate.

Keywords:
agecoronectomyroot migrationthird molar

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Dental Implantology
  • Surgical Complications

Background:

  • Coronectomy is a procedure for impacted lower third molars to mitigate inferior alveolar nerve damage.
  • Root migration is a recognized surgical complication following coronectomy.

Purpose of the Study:

  • To evaluate the long-term behavior and migration patterns of retained roots after coronectomy.
  • To identify factors influencing root migration rates post-coronectomy.

Main Methods:

  • Prospective study with 3-5 years follow-up.
  • Panoramic radiographs taken at multiple postoperative intervals (1 week to 60 months).
  • Analysis of root migration patterns and correlation with patient age, sex, impaction type, and root form.

Main Results:

  • Significant root migration occurred within the first 6 (91.1%) and 12 (61.4%) months post-surgery.
  • Root migration stabilized after 24 months, with less than 5% showing further movement.
  • Increasing patient age correlated with decreased root migration (0.203mm less per year).

Conclusions:

  • Root migration after coronectomy is most pronounced in the initial postoperative year and tends to stabilize.
  • Younger patients experience greater root migration following coronectomy.
  • The incidence of root exposure requiring re-operation is low, but preoperative counseling should address migration, especially in younger individuals.