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We clinically studied the effects on plaque removal of differences in the reverse angle and frequency of a rotated electric toothbrush. We used a newly designed electric toothbrush under four conditions―2,000 cpm frequency and 20°, 40°, and 75°reversal angles and 3,500cpm frequency and 40°reversal angle. Differences between2,000cpm/20°and2,000cpm/40°,2,000cpm/75°,and3,500cpm/40°were significant for total,proximal and mesial tooth surfaces.and between2,000cpm/20°and2,000cpm/40°and3,500cpm/40° on distal surfaces. The clinical trial also showed,the effect of plaque removal to be almost the same as a brushing simulator. We concluded that the rotary electric toothbrush is more effective in plaque removal at wigher reverse angles and frequencies. J Jpn Soc Periodontal, 47:103―108,2005.

Effect on Plaque Removal of Different Frequencies and Reversal Angles in a Rotated Electric Toothbrush