What is a coronectomy?
A coronectomy removes the crown of a lower wisdom tooth and leaves its roots in the jaw, because they lie very close to the nerve that supplies feeling to the lip and chin. It aims to lower the risk of numbness compared with full removal and is considered only for healthy, uninfected roots. For patients in Dubai, whether it suits you, and whether it is done at Creative Arts or by referral, is decided at an assessment with 3D imaging.
Who treats you here Dr. Firas Osman Oral & Maxillofacial Surgeon & Implantologist
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What is a coronectomy and how is it done?
A wisdom tooth has two parts that matter here: the crown, which is the part that causes most problems such as trapped food, gum infection and decay, and the roots, which in some people lie against or around the inferior alveolar nerve. That nerve runs through a canal inside the lower jaw and gives feeling to the lower lip, chin and lower teeth on that side.
In a coronectomy the surgeon opens the gum, divides the tooth just below the crown and removes the crown completely, leaving the roots a little below the level of the bone. The roots are not root-filled; they are left alive and the gum is closed over them, usually with stitches. Over the following months, bone often grows over the top of the retained roots. It is done under local anaesthetic, with sedation as an option for anxious patients, much like other wisdom tooth surgery.
The idea is simple: the crown is the source of the problems, while the roots are the part that endangers the nerve. Removing one and leaving the other aims to solve the first without risking the second.
Why does the nerve matter in wisdom tooth removal?
The NHS explains that wisdom tooth removal can damage nerves close to the tooth, causing numbness or tingling in the tongue, lips and chin, and that this usually gets better but can last a few weeks or months. For most wisdom teeth the risk is low because the roots are well away from the nerve. It rises when the roots and the nerve canal overlap closely, because lifting the roots out can bruise or stretch the nerve.
Our guide to wisdom tooth nerve damage explains the symptoms and recovery in detail. This page covers the planning question that comes before surgery: what can be done when the roots and nerve are very close.
How do surgeons tell if a wisdom tooth is close to the nerve?
The first clue usually comes from a panoramic X-ray. Signs that make a surgeon look more carefully include a dark band across the root where the nerve canal crosses it, interruption of the thin white lines that outline the canal, the canal changing direction or narrowing as it passes the root, and roots that curve around the canal.
A flat X-ray cannot show whether the nerve passes beside, under or between the roots. A 3D CBCT scan can. It shows the exact position of the canal relative to each root, how much bone separates them and whether the roots are hooked around it. This is usually the point at which the options, including a coronectomy, are discussed. Creative Arts has 3D CBCT imaging for surgical planning.
Coronectomy, full removal or monitoring: how do they compare?
A general comparison for a lower wisdom tooth whose roots are close to the nerve. The right choice depends on the imaging and on why the tooth needs treatment.
| Full removal | Coronectomy | Monitoring | |
|---|---|---|---|
| What is removed | The whole tooth | The crown only; roots stay in the bone | Nothing |
| Main aim | Remove the tooth and its problems completely | Remove the crown's problems while keeping distance from the nerve | Avoid surgery while the tooth causes no harm |
| Nerve risk | Higher when roots touch the nerve | Lower, according to published reviews, though not zero | None from surgery |
| Chance of a second procedure | Low | Some retained roots move upwards and are later removed | Treatment may be needed later if problems start |
| Usually suits | Most wisdom teeth, and teeth with infection in the roots | Healthy, uninfected roots in close contact with the nerve | Teeth causing no symptoms or disease |
Whether a coronectomy is appropriate for you, and whether it is performed at Creative Arts or by referral, is decided at an assessment.
When is a coronectomy safer than full removal, and when is it not?
A coronectomy is considered when the crown must come out, for example because of repeated gum infections or decay, and the imaging shows that the roots and the nerve are in close contact. It is less suitable, or not suitable, when:
- the tooth or its roots are infected, or decay has reached the pulp, because infected roots left in the bone can cause ongoing problems;
- the tooth is loose, since a mobile root is likely to work its way out;
- the tooth lies so that dividing the crown would itself put the nerve at risk;
- a medical condition or treatment affects healing of the jaw bone, which needs individual discussion.
In those situations, full removal with careful technique, monitoring, or another plan may be advised instead. Some patients also prefer the certainty of full removal once the risks have been explained; that is a legitimate choice and part of the consent conversation.
What happens to the roots left behind?
In many patients the roots simply stay where they are, and bone forms over them. In some, the roots move slowly upwards, away from the nerve, during the first months. A systematic review of coronectomy of lower wisdom teeth, published in Healthcare in 2021, found that root migration was the most commonly reported long-term consequence and that some roots were later removed. Because they have moved away from the nerve by then, removing them is usually a simpler procedure than the original extraction would have been.
Follow-up X-rays check that the roots are stable and healthy. A root that becomes exposed through the gum, or an area that becomes infected, is treated, usually by removing the root. Our guide to a bone fragment after an extraction covers the sharp pieces that sometimes surface after any extraction, which are a different issue.
Told your wisdom tooth is close to the nerve? Book an assessment with the oral surgery team in Dubai. Imaging is reviewed with you, every option is explained, and you receive a written plan before any decision.
Oral surgery assessmentWhat is recovery like after a coronectomy?
Recovery is broadly similar to other wisdom tooth surgery: some swelling and soreness that usually peak around the second or third day, a soft diet for a few days and careful cleaning while the gum heals. The NHS recovery advice after wisdom tooth removal applies, including avoiding smoking, alcohol and very hot drinks, and seeking help for bleeding that does not stop, or worsening pain, swelling, fever or a bad taste. Our wisdom teeth recovery guide sets out the day-by-day pattern.
A coronectomy lowers the chance of nerve injury but does not remove it. The 2021 systematic review reported inferior alveolar nerve injury in 0.59% and lingual nerve injury in 0.22% of the coronectomies it included, while noting that only a minority of the included studies were methodologically appropriate. Your surgeon should explain your own risks for both approaches before you decide.
How wisdom teeth near the nerve are assessed at Creative Arts
Wisdom tooth surgery at Creative Arts is assessed and planned by Dr. Firas Osman, Oral & Maxillofacial Surgeon & Implantologist. The assessment covers your symptoms and medical history, an examination, X-rays and, when the roots appear close to the nerve, a 3D CBCT scan. The options explained include full removal, monitoring and, where it may be appropriate, coronectomy, with the benefits and risks of each. Whether a coronectomy is suitable for you, and whether it is done here or by referral, is decided at that assessment.
For pain while you wait, see our guide on wisdom tooth pain relief. If several wisdom teeth need treatment, the guide on removing all wisdom teeth at once explains how sessions are planned, and wisdom tooth removal in Dubai describes the standard procedure.
Who assesses wisdom teeth near the nerve
Dr. Firas Osman (Oral & Maxillofacial Surgeon & Implantologist) reviews the X-rays and 3D scan, explains the options and their risks, and plans wisdom tooth surgery.
