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Various reports have evaluated the cleaning effects of electric toothbrushes in comparison with those of manual toothbrushes.The present study was designed to determine the efficacies for cleaning at denuded root surface, who are often found in the practice of periodontal therapy.The aim of present study is to evaluate the efficacies of a counter rotational action powered toothbrush ( Interplaque (R) ) for cleaning at denuded root surface on jaw models.The one in which the denuded root portion was exposed up to 1.5mm from the CEJ ( 1.5mm model) and the other with the root exposed up to 3.0mm from the CEJ-(3.0mm model) . Normal gingival models were used as controls.In the experiment, artificial plaque was applied to the tooth surface, which then under a constant pressure of 250g, determined by a simple load-measuring device, for 15 sec per site using an electric brush, bristle tips of which were placed perpendicular to the tooth surface, and of 15 strokes per site using the manual brush according to the scrubbing method. Measurement was conducted at 61 4 4 16in each model. After brushing, teeth were placed on a standard stent, and pictures were taken of 4 different surfaces, mesial, buccal, distal and lingual, using a standard photographic apparatus. After printing, the area was measured using a digitalizer to calculate the rates of plaque removal by the electric and manual toothbrushes.Wilcoxon's test was used for statistical analysis. The following results were obtained.The mean total plaque removal rate was 94.2% for the electric brush and 79.4% for the manual brush in the 1.5 mm model, and 92.7% for the electric brush and 83.1% for the manual brush in the 3.0mm model, while the rate was 96.2% for the electric brush and 90.9% for the manual brush in the normal gingival model. When assessed according to the site of measurement, the plaque removal rate was higher with the electric brush than with the manual brush in all sites except the frontal teeth of the 1.5 and 3.0mm models. The differences in all sites except the frontal teeth of the 1.5 and 3.0mm models were statistically significant. These results indicate that, while plaque removal by the electric and manual toothbrushes differed only slightly in the anterior teeth, irrespective of the extent of gingival recession, the difference was greater in the molar