What Glickman class indicates a usually favorable prognosis with proper treatment?

The Glickman classification system categorizes periodontal disease based on the severity of the attachment loss and the condition of the supporting structures of the teeth. Class I is characterized by a slight increase in probing depth with no clinical attachment loss, typically associated with gingivitis or very mild periodontitis. This stage usually responds well to conservative treatment measures, such as scaling and root planing, and has a favorable prognosis when appropriate treatment is employed.

Class II, Class III, and Class IV represent more advanced stages of periodontal disease, which involve greater levels of attachment loss, increased probe depths, and more complex treatment needs. These classes generally indicate a less favorable prognosis due to the more significant involvement of the periodontal tissues. Therefore, Class I stands out as a stage where favorable outcomes are more likely when treated correctly, aligning with the understanding of periodontal disease management.