The Cumulative index measures all the evidence of a condition, past and present. Which of the following conditions is an appropriate example for a Cumulative index?

• A. Bleeding on probing
• B. Calculus index
• C. Dental caries
• D. Oral hygiene status

Answer: (C)

Understanding cumulative indices means focusing on measures that reflect the total burden of a condition over time, not just what is happening right now. Dental caries fits this because caries experience is cumulative: once caries occurs, it can be recorded as decayed, missing due to caries, or filled, and these events accumulate in the lifetime caries index (like DMFT/DMFS). Even if current active decay isn’t present, the past caries events remain part of the record, giving a lifetime measure of caries experience.

In contrast, indicators like bleeding on probing capture current gingival bleeding at the time of exam, and calculus presence or oral hygiene status reflect present condition or behavior rather than a historical history. That’s why dental caries is the best example of a cumulative index.