Abstract
The dentogingival unit is the most coronal barrier between internal environment and oral cavity. Respect to this dimension, the biological
width which is attached tissue coronal to the alveolar crest, is a necessity for successful interdisciplinary treatment approach. Modern
restorative dentistry has become more refined, specialised and more patient friendly with interdisciplinary approach. Interdisciplinary
approach has not only made work less complicated but also increases the longevity of dental restorations. And one such aspect is the
harmonious relationship between restoration and the surrounding periodontal tissue. A violation of this tissue space (i.e. the biological
width) seriously undermines prognosis. This review intends to enlighten dental practitioners about biological width concept and
represents an attempt to answer some of the demands in relation to it, ranging from problems that occur after improper margin placement
in the periodontium to correction of biological width violations.

Key words: Biological width, Biological width violations, Correction of biological width violation, dental restorations