Coronectomy
Pronunciation: kor-oh-NEK-toh-mee
An intentional surgical procedure in which only the crown of a deeply impacted lower third molar is removed, leaving the roots in situ to avoid inferior alveolar nerve injury.
Full Definition
Coronectomy, also termed 'intentional root retention' or 'partial odontectomy', is performed when the roots of a lower wisdom tooth are in intimate contact with the inferior alveolar nerve (IAN) and full extraction would carry an unacceptable risk of permanent nerve damage. The crown is sectioned and removed, the roots are smoothed down below the alveolar crest, and the site is closed primarily. The retained roots may migrate coronally over time and occasionally require secondary removal. Editors must not confuse coronectomy with standard third molar extraction; operative notes and consent documentation should be carefully reviewed to ensure the correct procedure is named.
Usage
Usage note: Never shorten to 'crown removal' in clinical documents, as this is ambiguous. Always clarify that root retention is intentional to avoid confusion with an incomplete extraction.
In Context
- "Due to the proximity of both roots to the inferior alveolar canal on CBCT imaging, coronectomy was recommended rather than full extraction." — Pre-operative assessment letter
- "Coronectomy was carried out without complication; the residual roots were left at least 3 mm below the alveolar crest." — Operative note