Abstract
Ultrasonic backscattering techniques are used to monitor the setting process of calcium sulfate. A 3.5 MHz frequency A-scan pulse-echo system is used to obtain the acoustic properties of a cylindrical sample of calcium sulfate. The temperature of the sample and the rf backscattering signal are measured every two seconds during the whole setting process. Apparent integrated backscatter (AIB) and speed of sound (SOS) are calculated from each measured rf signal. A positive correlation is observed between the sound velocity and AIB during the setting process, identifying three states of the sample: liquid, transient and solid. Sound velocity changes from 1480 m/s (liquid) to 2700 m/s (solid), meanwhile AIB changes between -15 dB and 0 dB. In the transient phase, the two parameters are sensible to the fast change in the mechanical properties of the medium. A smooth and continuous evolution of both parameters is observed as a consequence of the gradual change in the mechanical properties of the calcium sulfate during the setting in the middle region. The presented results show that the state of a sample in a setting process can be determined by performing backscattering analysis, which could have application in monitoring changes in guided bone regeneration processes for dental implant procedures.
BibTeX citation
@inproceedings{SendraICU2019,
author = {Josep Rodríguez-Sendra and Noé Jiménez and Rubén Picó and Joan Faus and Francisco Camarena},
booktitle = {ICU 2019: International Congress on Ultrasonics. Bruges, Belgium. 3 - 6 September},
editor = {Proceedings of Meetings on Acoustics},
isbn = {ISBN: 978-84-87985-30-4},
month = {10},
organization = {KU Leuven},
publisher = {AIP Publishing},
series = {Oral},
title = {Calcium sulfate setting monitoring with ultrasonic backscattering analysis},
url = {https://kuleuvencongres.be/2019icu},
year = {2019}
}