Echographic response of the bone-implant interface: dependence on healing time
Résumé
The effect of bone healing on the ultrasonic response of coin-shaped titanium implants is investigated. Two groups of eight implants were inserted on the tibiae of New Zealand White rabbits, each group corresponding to a healing duration (7 or 13 weeks). After the sacrifice, a 2-D scanning device was used in order to measure the ultrasonic response of the bone-implant interface in vitro at 15 MHz. The average value of the ratio r between the amplitudes of the echo of the bone-implant interface and of the water-implant interface was determined. Histological techniques were used to determine the fraction of implant surface in contact with bone (BIC). The ultrasonic quantitative indicator r is significantly higher (p = 2.10-4) after seven weeks of healing time (r = 0.53) than after thirteen weeks (r= 0.49). The increase of mineralization of newly formed bone tissue and the increase of the BIC (from 27 % to 69 %) are responsible for the decrease of the gap of acoustical impedance at the bone-implant interface.
Domaines
Acoustique [physics.class-ph]Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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