The Calculus Surface Index is a measure of dental calculus formation. It can be used to quantitate the accumulation of dental calculus in short-term testing programs to evaluate the effectiveness of preventive care.


(1) Each of the 4 mandibular incisors is assessed on 4 surfaces (one labial, one lingual and two proximal).

(2) Each surface with calculus is scored 1 point.


calculus surface index =

= SUM(calculus points on the 16 surfaces surveyed)



• minimum score: 0

• maximum score: 16

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