Looking into Teeth with Ultrasound

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Science  02 Aug 1968:
Vol. 161, Issue 3840, pp. 477-478
DOI: 10.1126/science.161.3840.477


Ultrasound is readily conducted across a boundary when the specific acoustic impedances of the two media are about equal. The specific acoustic impedance of dental enamel is about that of aluminum. A longitudinal sonic pulse, less than 250 nanoseconds in duration, conducted to the tooth through an aluminum rod, has positively detected the enamel-dentin junction as well as the dentin-pulp interface.

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