Comparison of the effects of ultrasound toothbrushes with different frequencies on oral hygiene: A randomized‐controlled clinical trial

Abstract

Previous research has shown that an ultrasonically activated water stream is effective for removing oral biofilms 1 ; therefore, ultrasound is considered effective for improving oral hygiene. Ultrasound technology is utilized in powered and ultrasound toothbrushes, which generally have a frequency of 1.6 MHz, 2,3 and the further positive effects of ultrasonic toothbrushes have been confirmed in additional studies. 4,5 A previous pilot study also demonstrated that ultrasound helps to remove plaque. 6 However, the effects of ultrasound toothbrushes with no sonic vibration on oral hygiene have not been elucidated. Moreover, no evidence indicating whether 1.6 MHz is