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Crown lengthening is a periodontal surgical procedure that increases the visible clinical crown of a tooth by repositioning the gum margin — and in most cases also reshaping the underlying bone — to expose more tooth structure. At Dazzle Dental Clinic, it is performed by the periodontic team and is indicated for two distinct clinical purposes: restorative preparation and aesthetic correction of the gum line.
The Two Clinical Indications
Restorative crown lengthening is required when a tooth has fractured, decayed, or broken down to a level at or below the gum line, leaving insufficient supragingival (above-gum) tooth structure to retain a crown. A crown needs at least 2–3mm of tooth structure above the bone margin to achieve adequate ferrule effect — the band of sound dentine the crown encircles to resist vertical and rotational forces. Without adequate ferrule, even the best crown will fail early.
The concept of biological width is central here. Approximately 2mm of healthy connective tissue and junctional epithelium occupy the space between the bone crest and the gum margin. If a crown margin is placed within this space, the biological width is violated — causing chronic inflammation, bone loss, and gingival recession. Crown lengthening repositions the bone apically, restoring the biological width below the planned crown margin. This is not cosmetic; it is the structural requirement for a long-lasting restoration.
Aesthetic crown lengthening (gingivoplasty) corrects a gummy smile caused by altered passive eruption — a condition where the gum has not fully receded to its correct position during dental development, leaving excessive gum covering otherwise normally-proportioned teeth. The procedure removes the excess gum tissue and recontours the gum line to reveal more tooth, improving the tooth-to-gum ratio in the smile. In some cases, the bone level is also adjusted; in others, soft tissue removal alone achieves the result. For a broader overview of how this fits into cosmetic treatment, see our cosmetic dentistry guide.
The Procedure at Dazzle
Crown lengthening is performed under local anaesthesia. At Dazzle, the periodontist marks the planned new gum margin before beginning — using the digital smile design analysis for aesthetic cases and the crown margin depth for restorative cases. An incision is made to reflect the gum tissue from the bone, the bone is re-contoured using surgical burs or piezo-surgery (ultrasonic bone surgery), and the gum is repositioned and sutured at the new, more apical level.
Duration: 45–90 minutes for a single tooth; longer for multi-tooth aesthetic cases. Piezo-surgery — available at Dazzle — selectively cuts bone while leaving soft tissue uncut, reducing operative trauma and improving precision in cases where the bone margin requires careful contouring.
Healing and Crown Timing
Post-operative healing: suture removal at 7–10 days. Soft tissue healing: 3–4 weeks. Bone remodelling and gum margin stabilisation: 6–8 weeks minimum, often 3 months for full maturation. For restorative cases, the permanent crown should not be placed until the gum margin has stabilised — typically at 6–8 weeks minimum. Placing the crown before gum stabilisation risks the final margin level shifting, compromising the aesthetic and biological outcome. A temporary crown protects the prepared tooth during the healing period.
FAQs
Q1: Will my teeth look longer after crown lengthening?
For restorative cases (single tooth or small area): the change in appearance is usually modest and is often hidden by the subsequent crown. For aesthetic cases involving multiple upper front teeth: yes, the teeth will appear longer and more proportionate relative to the gum. This is the intended result. A wax mock-up of the planned gum level is reviewed by the patient before the procedure in aesthetic cases.
Q2: Is crown lengthening painful?
Performed under local anaesthesia: no pain during the procedure. Post-operatively: soreness for 3–5 days, managed with ibuprofen. Swelling is minimal for single-tooth cases; more pronounced for multi-tooth procedures. Patients return to normal activities the following day in most cases.
Q3: Can crown lengthening be avoided?
For restorative cases where the fracture is very deep (more than 4–5mm below the bone), crown lengthening may not be feasible — the amount of bone removal required would compromise the adjacent teeth. In these cases, extraction with implant replacement is evaluated. A CBCT assessment determines whether the fracture depth is within the range amenable to crown lengthening.
Q4: How long does the result last?
Crown lengthening with bone recontouring produces stable, permanent results in the vast majority of cases. Gum tissue does not re-grow over the bone that has been removed. The new gum level is maintained long-term provided no new bone-destructive pathology develops. Aesthetic results are permanent with good oral hygiene maintenance.
