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In vitro examination of human teeth using ultrasound and X-ray diffraction

Gawda H., Sękowski L., Trębacz H.

Acta of Bioengineering and Biomechanics

2004

Vol. 6, nr 1

41-49

The aim of this paper was to find whether an ultrasound velocity along a whole tooth reflects variety of its morphology and properties and to compare thc results of ultrasonic measuremcnts with X-ray diffraction data from a large area of tooth. 100 kHz pulses were transmitted in longitudinal direction of ectracted teeth. A significant variation of velocity in teeth from diffcrent donors was statwd (from 3200 m/s to 4200 m/s). The velocity was influenced both by the age of donors and the type of a tooth. For a given individual, the grcatest difference was revealed between incisors and canine teeth. Considering X-ray diffraction results, a difference in size of crystallites between teeth was found. In an enamel, the size of crystallites ranged from 20 nm to 50 nm, and in dentin - from 5.5 nm to 39 nm. The size of crystailites in dentin was positively correlated with the ultrasound velocity.

Porównawcze badania zębów in vitro metoda ultradźwiękową i dyfrakcji promieni X

Gawda H., Sękowski L.

Prace Naukowe Instytutu Telekomunikacji i Akustyki Politechniki Wrocławskiej. Konferencje

2001

Vol. 83, nr 27

325-328

Comparative investigations of teeth in vitro were carried out using ultrasonic method and X-Ray diffraction. A correlation between size and orientation of HAP crystallites and ultrasonic waves velocity was stated. X-Ray diffraction showed that there is a larger differentiation within a single tooth than between different teeth of an individual. This result was confirmed by ultrasonic measurements.