Periodontitis Staging & Grading

A simple chairside calculator.

1. Patient Profile

Age

Probing Depth Score

Bleeding Percentage

Plaque Percentage

2. Severity (Base Stage)

Maximum Interdental Clinical Attachment Loss

Maximum Radiographic Bone Loss

Used to calculate indirect progression ratio.

Tooth Loss due to Periodontitis

3. Complexity & Extent (Stage Shifters)

Extent & Distribution

Determine the percentage of teeth involved. Localized is less than 30%. Generalized is 30% or more. Molar/Incisor pattern describes specific localized destruction.

LocalizedGeneralizedMolar/Incisor pattern

Stage III Complexity

Probing depth 6 millimeters or greaterVertical bone loss 3 millimeters or greaterFurcation Class II or IIIModerate ridge defects

Stage IV Complexity

Masticatory dysfunctionSecondary occlusal trauma (Mobility degree 2 or greater)Severe ridge defectsBite collapse, drifting, or flaringFewer than 20 remaining teeth (10 opposing pairs)

4. Grading (Progression & Risk Modifiers)

Direct Evidence of Progression (Over 5 Years)

Refers to the actual measurement of Clinical Attachment Loss or Radiographic Bone Loss progression over the past five years. If these historical records are unavailable, leave as Unknown to use indirect evidence calculations.

Smoking Habit

Diabetes Status

Clinical Diagnosis

Localized Periodontitis

Stage I/Grade B

Stage Justification

•No significant Clinical Attachment Loss or Radiographic Bone Loss recorded.

Grade Justification

•Defaulted to Grade B pending indirect or direct evidence.

This tool utilizes the Staging and Grading frameworks established by the 2017 World Workshop on the Classification of Periodontal and Peri-Implant Diseases and Conditions, co-presented by the American Academy of Periodontology and the European Federation of Periodontology.

Disclaimer: This application is designed as a quick chairside reference for dental professionals and is for educational and informational purposes only. It is not a substitute for professional clinical judgment, diagnosis, or formulation of a comprehensive treatment plan. Always verify calculations with complete radiographic and clinical examination.

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