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Averages the Silness-Loe surface scores of 0 to 3 across all surfaces examined to give the plaque index.
Silness-Loe plaque index
Index = sum of surface scores / number of surfaces examined, where each surface scores 0 (none) to 3 (abundant plaque)
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
The O'Leary plaque control record reports the percentage of surfaces with any plaque rather than a graded mean.
Classically four surfaces on each of six index teeth, though full-mouth scoring is also used.