title: Evaluation of human tooth structure with the ultrasonic imaging technique.
abstract: In recent years, ultrasonic waves have been an interesting subject for studies due to their wide range of applications in medical diagnoses. In this study, the acoustic properties of the structure of human teeth was determined with the ultrasonic imaging technique. This study may offer some fundamental findings related to the clinical application of the ultrasonic imaging technique in the further development of a virtual system for dental education and research. Twenty freshly-extracted permanent human teeth (10 molars and 10 premolars) were used to investigate their acoustic velocity and impedance by the ultrasonic image analyzing system with a high-resolution focusing probe. Additionally, the relationship between the acoustic properties and the hardness of the teeth was evaluated. It was found that the acoustic properties of the human teeth were influenced by factors related to their structure, such as degree of calcification, distribution of dentinal tubules, and volume of the dentin matrix. The acoustic velocity and impedance showed an apparent correspondence to the hardness of tooth. This analyzing system provides visual information related to tooth structure that can easily quantitatively evaluate their acoustic properties. It is expected that this system will have a wide range of applications and be further developed for clinical uses.
authors.affiliation: Department of Endodontics, Nihon University School of Dentistry, Tokyo, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Mezawa
authors.forename: T
authors.initials: T
authors.lastname: Kawato
authors.forename: K
authors.initials: K
authors.lastname: Yoshida
authors.forename: H
authors.initials: H
authors.lastname: Nozaki
authors.forename: T
authors.initials: T
authors.lastname: Saito
authors.forename: K
authors.initials: K
authors.lastname: Tamura
authors.forename: M
authors.initials: M
authors.lastname: Onozawa
mesh_terms: D000162:Acoustics; D001641:Bicuspid / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D006244:Hardness; D006801:Humans; D066298:In Vitro Techniques; D008963:Molar / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D014070:Tooth / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D014463:Ultrasonography / Q000295:instrumentation / Q000379:methods / Q000706:statistics & numerical data