Periodontics · single question
Which of the following is used to determine periodontitis GRADING (as opposed to staging)?
Show answer and explanation
Correct answer: C. Rate of progression (e.g., bone-loss-to-age ratio) and risk factors
In the 2017 periodontitis classification, STAGING is based on severity (clinical attachment loss, radiographic bone loss, tooth loss, and complexity), while GRADING reflects the rate of progression and risk — estimated using direct/indirect evidence of progression (such as the percent bone loss/age ratio) plus modifying risk factors like smoking and diabetes. Clinical attachment loss and probing depth are staging criteria, not grading criteria.