Fake vibrating teeth could make great hearing aids
Prosthetic teeth turn out to be effective carriers of vibrations, making them suitable as potential hearing aids.," published earlier this month in The Journal of the Acoustical Society of America, eggheads at Tongji University in Shanghai describe tests to determine how well implanted teeth conduct sound.
The authors, Fengxuan Ren, Yutong Li, Lidan Chen, Jiaqi Huang, and Jianxiang Tao, explain how it's well-known thatthrough natural teeth can produce an auditory effect. But sound transmission through artificial teeth hasn't received as much study. So the researchers assembled 38 subjects who met the desired criteria and had them listen for a signal transmitted by a vibration device placed on either a tooth implant, a natural tooth, or the mastoid bone . The stimulus took the form of tones with frequencies between 250 Hz and 4000 Hz at 30 dB, and at lower decibel levels if the participants signaled that they heard the sound.
The results suggest"dental implants were more sensitive to [bone conduction] than natural teeth and mastoids at some frequencies," the authors observe. The study results also indicate that implants in front teeth have a lower threshold to detect vibrations than back teeth."[A]nterior dental implants showed better [bone conduction] sensitivity than posterior ones," the authors state, speculating that this is due to differences in bone density in the front and back of the jaw.
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