Different methods and considerations of crown lengthening (A review)

It's obvious that periodontal health for long term prognosis of the teeth and restorations is critical, specially so when considering a subgingival restoration. This article explains about biologic width and reviews the crown lengthening procedures and conditions and it's indications and contraindications. Biologic width in definition is the region that junctional epithelium and connective tissue fibers attach to the tooth, and may include sulcular depth. If for any reasons, we have to insert the margins of restorations in subgingival regions, biologic width consideration and not to violate to its dimension is critical. So, if exposure of excess tooth structure is necessary, we should do crown lengthening procedures to achieve the objectives of restorative procedures and not to invade to BW.