Whether caused by extensive carious destruction, subgingival fractures, severe tooth wear, or altered passive eruption, a reduced clinical crown compromises tooth isolation, retention, and resistance form.
Furthermore, placing restorative margins in close proximity to the alveolar crest risks violating the supracrestal tissue attachment (formerly referred to as the biologic width), triggering chronic inflammatory responses, attachment loss, and uncontrolled bone resorption.
Clinical crown lengthening serves as an essential therapeutic procedure designed to increase the supragingival tooth structure while establishing a healthy periodontal-restorative interface.
Depending on the primary clinical objective, these procedures are categorized into two main indications:
✔ Functional Crown Lengthening: Aimed at exposing subgingival caries, root fractures, or deeply positioned restoration margins to obtain an adequate structural ferrule and facilitate isolation.
✔ Aesthetic Crown Lengthening: Primarily performed in the anterior zone to correct excessive gingival display ("gummy smile") or manage asymmetrical gingival contours while preserving harmonious tooth proportions.
Published by the European Federation of Periodontology (EFP), this comprehensive review outlines the full therapeutic armamentarium available to modern clinicians.
The publication dissects the decision-making criteria governing technique selection—including remaining keratinized tissue, distance to the alveolar bone crest, root anatomy, and aesthetic demands:
1. Gingivectomy: Indicated when adequate keratinized tissue exists and the distance between the intended gingival margin and the bone crest is greater than or equal to 3 mm.
2. Apically Positioned Flap (APF) with Osseous Resection: The gold standard when the alveolar crest is minor to 3 mm from the planned margin, combining ostectomy and osteoplasty to reposition the supracrestal tissue attachment apically.
3. Orthodontic Extrusion (Forced Eruption): A minimally invasive alternative or adjunct for deep subgingival defects and non-restorable roots in aesthetically sensitive areas, preserving adjacent osseous and soft-tissue architecture.
For periodontists, prosthodontists, and general practitioners, this article delivers an indispensable, evidence-based framework to reconcile restorative demands with long-term periodontal health.
📖 Ready to review the precise anatomical parameters, step-by-step surgical indications, and clinical case illustrations for crown-lengthening protocols? Click here to read the full article on the European Federation of Periodontology.
