When a tooth is fractured deep into the gum line or has cavities that extend too far into the gum, making it difficult to repair, or when there is insufficient tooth structure exposed above the gumline to support the creation of a dental crown or orthodontic appliance. In such cases, crown lengthening involves removing excess gum tissue and reshaping or removing some of the alveolar bone to expose the damaged tooth structure above the gumline, making it suitable for cavity restoration or appliance placement.
In situations where some patients show excessive gum display, especially in the anterior region of the upper jaw, resulting in teeth appearing with very short crowns or uneven gum levels, crown lengthening can be used to increase the crown length of teeth, ensuring uniformity in crown length and gum positioning between adjacent teeth.