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Journal of Dental Research
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A Finite Element Study of Ultrasonic Wave Propagation in a Tooth Phantom

S.R. Ghorayeb

'Department of Engineering, Hofstra University, 104 Weed Hall, Hempstead, New York 11549; and Department of Electrical and Computer Engineering, Iowa State University, 201 Coover Hall, Ames, Iowa 50011

T. Xue

Jet Propulsion Laboratory, 125-224, 4800 Oak Grove Dr., Pasadena, California 91109

W. Lord

Department of Electrical and Computer Engineering, Iowa State University, 391 Durham Center, Ames, Iowa 50011

Ultrasound is used extensively in industry for the detection and characterization of defects in critical engineering structures. Similar techniques could be used in dentistry if a thorough understanding of ultrasonic wave propagation in teeth were available. This paper presents a hypothesis that finite element analysis can be used to solve the hyperbolic partial differential equation which governs ultrasonic wave propagation in teeth. A three-layer tooth phantom based on the geometry of a human second molar is used to illustrate the validity of this hypothesis. Simulated wave propagation studies are described for the tooth phantom with a gold crown layer, with an amalgam restoration insertion, and containing a cavity. Results clearly show the finite element code's ability to predict and visualize ultrasonic wave propagation in complex dental structures.

Key Words: finite element • ultrasonic testing • dental diagnostics.

Journal of Dental Research, Vol. 77, No. 1, 39-49 (1998)
DOI: 10.1177/00220345980770010301
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