A reproducible method of evaluating oral hygiene

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Abstract
A reproducible method of evaluating oral hygiene has been developed for use in blind studies. An erythrosin‐containing disclosing solution is applied and black and white photographs taken of the 12 anterior teeth.The method was evaluated by one investigator on a group of 35 experimental subjects. The reproducibility of the results were estimated by scoring from the same photographs after intervals of one month and ten months. In addition, reproducibility was tested by re‐photographing the anterior teeth of the same subjects with variations in the position of the camera. Variations of up to 15 degrees in the vertical and horizontal planes were tested.It was found that errors with this method were small and that it is sufficiently accurate for controlled studies. Also it has shown that focusing with a hand‐held camera, without special equipment to fix the patient/camera relationship, is satisfactory.

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