Simplification of plaque index method of Quigley and Hein

It was tested to reduce the number of teeth surfaces to graduate plaque with the scale by Qugiley and Hein without loss of representation to total number of (all existing) teeth. Incisivi and canini (oral + vestibular surfaces) of lower jaw showed a high representation (over 80% of all cases) of total plaque value (all surfaces on all teeth).