Measurement of air-conducted and bone-conducted dental drilling sounds

摘要

Patients in dental clinics perceive the bone-conducted sound via the teeth in addition to the air-conducted sound from the ear during the drilling of their teeth. In order to reduce the discomfort during treatment, it is necessary to find the characteristics of both the air-conducted and the bone-conducted dental drilling sounds. It was found in our former studies that rich high-frequency components up to 20 kHz are included in the air-conducted dental drilling sound. However the characteristic of the bone-conducted dental drilling sound is not well known. In this study, the air-conducted and the bone-conducted dental drilling sounds up to high frequency range were simultaneously measured by microphones placed near the participants and on the participants' foreheads during drilling dental materials covered on their teeth. Further, the bone-conducted sound was measured during the drilling of the artificial teeth on the measurement model using the twelve kinds of dental drills. As the result, high frequency components up to 20 kHz in the bone-conducted dental drilling sound were observed.