Abstract
An ultrasonic nondestructive evaluation technique of the layer thickness in human teeth using a leaky Lamb wave device with two arch-shaped interdigital transducers (IDTs) is proposed. Each of the two IDTs on a piezoelectric ceramic plate operates as an input or an output transducer at a plate/water interface, in the configuration of an acoustic delay line of reflected ultrasound beams from the tooth section at the spot under investigation. The use of a higher-order mode, second symmetric (S 2) mode, leaky Lamb wave with a phase velocity higher than the longitudinal wave velocity in the human tooth is essential to enable the oblique incidence of the focused ultrasound beam. The echoes from dentin–pulp and enamel–dentin junctions are similar in the oscilloscope traces. The layer thickness of dentin or enamel for a number of teeth, estimated from the measured time interval between two reflected echoes, from the tooth surface and from the interface in the tooth, is in good agreement with the optically measured data.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
