How are clinical attachment level (CAL) readings calculated?

Clinical attachment level (CAL) is a critical measurement used to assess periodontal health. It reflects the position of the periodontal tissues relative to the root of the tooth. The correct method for calculating CAL is to take the probing depth and add any recession that has occurred.

Probing depth is the distance from the gingival margin to the bottom of the periodontal pocket, while recession refers to the exposure of the root surfaces due to the loss of gum tissue around the teeth. When both values are taken into account, you arrive at a comprehensive understanding of the attachment status of the periodontal tissue.

In essence, a higher CAL indicates a greater loss of attachment and potentially more severe periodontal disease, while a lower CAL suggests that the periodontal tissues are healthier. This measurement is essential for diagnosing and planning treatment for periodontal disease effectively.