The reversible index measures a dental condition that can be reversed. Which index is commonly used for this?

• A. Plaque Index
• B. Gingival Index
• C. Caries Index
• D. Calculus Index

Answer: (B)

The main idea here is that gingival inflammation is a reversible condition, and the index used to measure that inflammation is the one that scores how inflamed the gums are. The Gingival Index assesses the severity of gingival inflammation by looking at signs like color changes, edema, and bleeding on probing. Because gingivitis results from plaque-related irritation and does not involve permanent tissue destruction, it can subside or resolve when plaque is removed and proper oral hygiene is maintained. So, this index is the standard tool for tracking how the gums respond to improved care over time, capturing changes in inflammation that can move back toward normal.

Comparatively, a Plaque Index focuses on how much plaque is present, which is also reversible with good hygiene, but it measures biofilm presence rather than the inflammatory response itself. The Caries Index records carious lesions, which are not reversible in the same sense once decay has occurred. The Calculus Index measures mineralized deposits on teeth, which aren’t about a reversible inflammatory state but about the presence of calculus that can be removed.

So, the Gingival Index is the best fit for indexing a reversible inflammatory condition of the gingiva.