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Root migration after coronectomy of impacted mandibular third molars: case reports
General Dentistry
|August 19, 2025
Summary
Coronectomy, a procedure for impacted third molars near the inferior alveolar nerve (IAN), can cause root migration. This migration is typically safe, moving roots away from the nerve without symptoms.
Area of Science:
- Dentistry
- Oral Surgery
Background:
- Coronectomy is a surgical option for impacted mandibular third molars adjacent to the inferior alveolar nerve (IAN).
- Potential sequelae include root migration, necessitating careful evaluation.
Purpose of the Study:
- To describe and analyze root migration following coronectomy in impacted mandibular third molars.
- To evaluate the clinical and radiographic outcomes of coronectomy with root migration.
Main Methods:
- Case series of 3 women (21-31 years) undergoing coronectomy for impacted mandibular third molars.
- Standard coronectomy technique with root fragments intentionally left impacted below 3 mm of bone.
- 1-year follow-up with clinical and panoramic radiographic examinations.
Main Results:
- Panoramic radiographs at 1 year showed root migration of 3 to 5 mm in all cases.
- No patients experienced pain or opted for secondary surgery.
- Roots migrated away from the inferior alveolar nerve.
Conclusions:
- Root migration after coronectomy is a common, non-pathological sequela.
- Coronectomy remains a safe alternative to extraction for third molars near the IAN.
- Secondary surgery is indicated only for symptomatic migration, root exposure, or infection.
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