Which findings contribute to periodontal staging under the 2018 guidelines?

• A. Probing depth, bone loss, mobility, and furcation involvement
• B. Bleeding on probing, plaque, calculus
• C. Patient age
• D. Diet and fluoride exposure

Answer: (A)

Staging evaluates how much supporting tissue is lost and how complex the case is to manage. The best answer lists the measurements that reflect structural loss and functional impact: probing depth shows how deep the pockets are, bone loss indicates the extent of loss of supporting bone (often assessed radiographically), mobility reveals how stable the tooth is in the socket, and furcation involvement shows loss of support in multi-rooted teeth. Together, these factors capture both severity and complexity of the disease.

Bleeding on probing, plaque, and calculus reflect inflammation and biofilm burden but do not define how advanced or complicated the periodontitis is. Patient age and lifestyle factors like diet and fluoride exposure influence risk and overall prognosis but aren’t used to stage the disease.