Methods: 

Sixty-four patients requiring crown lengthening on 64 teeth were included.  Bone was reduced based on the minimal amount of tooth structure required for restoration.  Patients were re-evaluated at 3 and 6 months.

Results:

There was significant soft tissue rebound (0.77 ± 0.58 mm) at 6 months post crown lengthening surgery.  The tissue rebound was significantly correlated with periodontal biotype: Thick-flat biotype experienced more tissue rebound (0.7 mm) than thin-scalloped biotype (0.37 mm).  Less tissue rebound was seen when the flap margin was further from the osseous crest after suturing.

Conclusions: 

Suturing the flap ≥ 3 mm from the osseous crest after surgery will minimize soft tissue rebound.  There was more tissue rebound and less crown length gained when a thick-flap biotype was present.

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For more information refer to

Evaluation of supracrestal gingival tissue after surgical crown lengthening: a 6-month clinical study.

Arora R, Narula SC, Sharma RK, Tewari S.

J Periodontol. 2013 Jul;84(7):934-40