Abstract
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—2,000cpm frequency and 20°, 40°, and 75° reversal angles and 3,500cpm frequency and 40° reversal angle. Differences between 2,000cpm/20° and 2,000cpm/40°, 2,000cpm/75°, and 3,500cpm/40° were significant for total, proximal and mesial tooth surfaces. and between 2,000cpm/20° and 2,000cpm/40° and 3,500cpm/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.
