Dental crown lengthening

A crown needs a band of sound tooth structure above the gum to grip, and there also has to be a certain distance between the bone and the restoration margin for the gum to remain healthy. Where decay or a fracture extends below the gum, neither condition is met. A crown placed there would trap plaque, inflame the gum and be likely to fail. Lengthening exposes more tooth so the margin can sit somewhere both retentive and cleanable.

Not usually. Gum contouring often refers to removing soft tissue alone, which is only sufficient where there is already adequate distance between the bone and the planned margin. Most functional crown lengthening also requires recontouring the bone, which means raising a flap and a longer healing period. A laser gum trim and osseous crown lengthening are quite different procedures, and it is worth clarifying which is being proposed.

There is a healing interval, and it exists because the gum margin continues to settle for weeks to months after surgery. Making the definitive restoration too early risks the tissue rebounding and leaving the margin visible or in the wrong relationship to the gum. The interval is longer for front teeth where appearance matters than for back teeth. It should be stated in your plan; some insurers also require a minimum interval before covering the crown.

Yes, by design: that is the point. On a back tooth this rarely matters. On a front tooth it can leave the treated tooth looking longer than its neighbors and can open a small space at the gum, which is why single-tooth aesthetic cases need careful planning and why orthodontic extrusion is sometimes the better option. For a gummy smile where several teeth are treated together, the aim is a symmetrical result instead of a change to a single tooth.

Orthodontic extrusion is the main one: instead of removing bone to expose more tooth, the tooth is moved coronally so sound structure comes above the gum. It is slower and requires orthodontic input, but it conserves bone and avoids affecting the neighboring teeth, which makes it attractive for single front teeth. The other alternative is extraction and replacement, which is sometimes the more sensible decision if the tooth is marginal anyway.

It is done under local anesthetic, so not at the time. Afterwards there is usually discomfort, some swelling and occasionally a dressing over the site, with the first week being the most noticeable. Root sensitivity after healing is common because more root surface is exposed, and it typically improves with time and desensitizing products. Discomfort that increases, not settles should be reported.

Yes, and it commonly is where a single tooth has a fracture or decay extending below the gum. The complication is aesthetic on front teeth, where treating one tooth in isolation can leave it looking longer than its neighbors, which is why single front-tooth cases deserve extra planning, and why orthodontic extrusion is sometimes preferred there specifically to avoid that mismatch.

A gummy smile case is planned around appearance and symmetry across several front teeth, often guided by photographs, smile analysis and a surgical guide made from a wax-up, and insurers usually treat it as cosmetic. A functional case is planned around exposing enough sound tooth structure for a specific restoration to succeed, is driven by a defect shown on radiographs, and is more likely to be considered a covered periodontal or surgical service.

It can affect the neighboring teeth to some degree, because bone recontouring at one tooth is rarely perfectly isolated from the bone supporting the teeth beside it. This is one of the specific reasons orthodontic extrusion is sometimes favored over surgery for a single front tooth: it moves the tooth instead of removing bone, leaving the neighbors' support undisturbed.

The amount is determined by how far the decay or fracture extends below the gum plus a fixed additional distance needed between the bone and the eventual restoration margin so the gum can stay healthy around it, not by guesswork or by how the tooth simply looks. This is measured directly during assessment and surgery, and it is what the surgical plan should specify in writing before the procedure instead of being decided freehand at the time.

No: bone and gum tissue removed during crown lengthening does not regenerate to its original position, and the change to how much of the tooth and root shows above the gum is permanent. This is an important point to weigh, particularly for aesthetic cases on front teeth, before agreeing to surgery, since the result cannot simply be undone if it is not liked.

No: the definitive restoration has to wait for the gum tissue to mature and stabilize after surgery, which takes weeks to months depending on the case, because placing it too soon risks the margin ending up in the wrong position as the tissue settles. What can sometimes be combined is the assessment and surgical planning stage, but not the surgery and the final crown itself.