What is the minimum amount of attached gingiva on the lingual side of tooth #25?

The minimum amount of attached gingiva on the lingual side of tooth #25, which is the mandibular right canine, is conventionally recognized as 5mm. This measurement is based on the need for adequate attached gingiva to support periodontal health and function. Attached gingiva plays an essential role in maintaining the integrity of the junctional epithelium and providing resistance against mechanical forces and pathogens.

In clinical practice, regions with less than 5mm of attached gingiva may be at a higher risk for periodontal issues, such as recession or inflammation, because insufficient attached gingiva can compromise the barrier against oral microbial invasion. Therefore, ensuring a minimum of 5mm allows for optimal health and stability in the periodontal tissue surrounding this tooth.