Osseous surgery for crown lengthening: a 6-month clinical study

Area of Science:

• Periodontology
• Restorative Dentistry
• Surgical Procedures

Background:

• Surgical crown lengthening is common, yet endpoints and long-term crown height stability are poorly understood.
• Clinical reports vary regarding tissue rebound and stability after similar surgical techniques.
• The study addresses the need for data on crown lengthening predictability and stability.

Purpose of the Study:

• To assess the stability of surgical crown lengthening procedures.
• To determine immediate crown height increase, 6-month stability, and bone removal.
• To evaluate the relationship between flap margin position and crown height stability.

Main Methods:

• Twenty-five patients (43 teeth) underwent surgical crown lengthening.
• Clinical indices and surgical measurements (stent to bone, flap to bone) were recorded.
• Measurements were repeated at 1, 3, and 6 months post-surgery.

Main Results:

• Mean crown height gain at surgery was 2.27 mm, reducing to 1.57 mm by 6 months.
• Significant differences in crown height gain and stabilization were observed across treated, adjacent, and non-adjacent sites.
• Closer flap margin placement to the alveolar crest correlated with greater tissue rebound.

Conclusions:

• Significant tissue rebound occurs post-crown lengthening, with stabilization not achieved by 6 months.
• Tissue rebound is influenced by the flap margin's position relative to the alveolar crest at closure.
• Clinicians should prioritize establishing correct crown height during surgery, avoiding over-reliance on flap placement.