In short. Removing bone is easier than restoring it. Why over-reduction is the revision this operation most wants to avoid, and what a rebuild achieves.
Key points
- The reason the amount of reduction is decided from imaging and treated as fixed is not caution for its own sake.
- It is that the error in this direction is the one that cannot be undone.
- Where a plan is described as achieving a particular amount of narrowing, the useful question is what happens if it turns out to be slightly too much, and a surgeon who answers that honestly is describing why the plan was set where it was.
Revision after jaw contouring is a different subject from revision after most cosmetic operations, because the first operation removed something that cannot be put back. Understanding that asymmetry is the reason this operation is planned conservatively rather than aggressively.
Why restoring bone is difficult
Removing bone is a straightforward matter of cutting and contouring. Restoring it is not, because bone that has been taken away cannot be returned to its original form. Material used to rebuild a contour behaves differently from the bone that was there: it does not have the same structure, it does not remodel in the same way, and it does not sit under the soft tissue in the same manner. A rebuild can improve how an over-reduced jaw reads, and it reproduces neither the original anatomy nor the original soft-tissue relationship.
This is the argument for a conservative plan
The reason the amount of reduction is decided from imaging and treated as fixed is not caution for its own sake. It is that the error in this direction is the one that cannot be undone. Where a plan is described as achieving a particular amount of narrowing, the useful question is what happens if it turns out to be slightly too much, and a surgeon who answers that honestly is describing why the plan was set where it was.
When a revision is worth considering
After the result has settled, which for this operation means around a year, because swelling resolves slowly and judging the contour earlier means judging something that is still changing. Where a stable and specific finding remains, a revision is a reasonable discussion: a residual asymmetry between the two sides, a step or irregularity along the border, or a reduction that reads as more than was intended and that the patient cannot accept.
What it can achieve
An improvement rather than a restoration. Adding material to a contour can soften an over-reduced outline and can bring the two sides closer together. It works on tissue that has already been operated on, which limits how much can be done and makes the outcome less predictable than a first operation. The honest framing is that a revision can make an unsatisfactory result better and cannot make it as though the first operation had not happened.
What revision cannot do
- Restore the bone that was removed, or reproduce the anatomy that was there before.
- Produce a result identical to a face that was never operated on.
- Guarantee a specific contour, because the tissue it works with has already been changed.
The practical consequence is that the important decision in this operation is the first one. A conservative plan that leaves a little more width than the patient hoped for has an error that can be addressed later; a plan that removes too much has one that cannot.
Frequently asked questions
Can bone be put back if too much was removed?
Not as it was. Bone that has been removed cannot be restored to its original form, and material used to rebuild a contour, whether the patient's own tissue or a synthetic one, does not behave like the bone that was taken away. It can improve a contour and it does not reproduce what was there, which is exactly why over-reduction is the error this operation most wants to avoid.
When is a revision considered?
After the result has settled, which for this operation means around a year rather than months, because swelling resolves slowly and masking an unsettled result with a second operation produces a third. A revision is considered where a stable, specific finding remains: an asymmetry, a step in the border, or a reduction that reads as more than was intended.
What can a revision actually achieve?
It can add volume or material to a contour that reads as over-reduced, and it can address an asymmetry or a step. What it cannot do is restore the original bone, and it works with tissue that has already been operated on. The achievable result is an improvement rather than a restoration, and that should be clear before the decision is made.
Risks & Limitations
- Removing bone is easier than restoring it. Over-reduction is difficult and sometimes impossible to correct, so the amount removed is decided from imaging and treated as fixed.
- The marginal mandibular nerve, which moves the lower lip, runs through the operative field. Weakness after surgery is usually temporary and usually resolves over weeks to months; a lasting weakness is uncommon but possible.
- Swelling hides the result for months. The face reads unevenly at two weeks, is not close to final until around six months, and is judged honestly at around a year.
- Numbness of the chin and the lower lip is expected, is watched rather than treated in the early weeks, and may not return fully in some areas.
- The two sides of a jaw are rarely identical, and reducing both by the same amount can make a pre-existing difference more visible.
- The operation changes width and the border between the jaw angle and the chin. It does not lengthen the face, correct a bite, or change the soft tissue over the new contour.
When to Seek Care
- Swelling that is increasing rather than settling after the first week, or that is much greater on one side — contact the team.
- A wound that is opening, or discharge, spreading redness or warmth around an incision.
- A weakness of the lower lip that is worsening rather than improving, or difficulty breathing or swallowing &mdash — seek emergency care at once.
- Fever, or feeling generally very unwell with a wound or a swollen area.
- Calf pain, swelling or tenderness in one leg, or shortness of breath or chest pain &mdash — seek emergency care at once.
References & Further Reading
- American Society of Plastic Surgeons (ASPS) - facial bone contouring and patient safety guidance
- National Institute for Health and Care Excellence (NICE, UK) - guidance on facial surgery and on venous thromboembolism prevention
- Cochrane Library - systematic reviews in oral and maxillofacial surgery
- British Association of Plastic, Reconstructive and Aesthetic Surgeons (BAPRAS) - patient information on facial surgery
- Chinese Medical Association Plastic Surgery Branch - clinical guidance
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.