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Evaluation of Dental Implant Osseointegration Using Ultrasonic Spectrometry: A Phantom Study
KTH, School of Technology and Health (STH), Health Systems Engineering, Systems Safety and Management.ORCID iD: 0000-0002-1831-9285
KTH, School of Technology and Health (STH), Medical Engineering.
2014 (English)In: WSEAS Transactions on Signal Processing, ISSN 1790-5022, ISSN 2224-3488, Vol. 10, no 1, 194-204 p.Article in journal (Refereed) Published
Abstract [en]

One of the challenging and important problems that still needs solution within the field of dental implant surgery is to monitor the osseointegration process. Therefore, this work aims to achieve a reliable noninvasive automatic method to evaluate dental implant stability which is directly related to the grade of osseointegration. For this purpose, an experimental phantom study was performed to simulate this process and evaluate it. Ultrasonic pectrometry was proposed and used to take measurements that were processed and analyzed to estimate the stability of the simulated dental implant. The phantom that was  designed and used in the experiments simulated a jawbone with a dental implant and was made of a little pool filled with soft-tissueequivalent material (with respect to ultrasound waves) and a solid cylinder of fresh oak-wood immersed into it to simulate the jawbone. A metal screw was used to simulate the dental implant. By screwing this screw into or out of the wooden cylinder, varying grades of stiffness and contact between the screw and the wooden tissues were obtained. And by this way, varying screw stability grades which simulate varying osseointegration grades were achieved. Pulse-echo ultrasound was used to measure the power spectra of the received ultrasonic echosignals. These power spectra were, at first, processed and normalized then analyzed by using the partial least squares method to estimate the corresponding implant stability or stiffness grades. The number of screwing turns (for the screw into or out of the wooden cylinder) was used as a measure of stiffness grade.The feasibility of this approach was investigated through experimental tasks and  romising results were achieved. A coefficient of determination R2 of 96.4% and a mean absolute error of ±0.23 screwing turns were achieved when comparing real and estimated  stiffness-grade values, indicating the high efficiency and good accuracy of this approach.

Place, publisher, year, edition, pages
2014. Vol. 10, no 1, 194-204 p.
Keyword [en]
Contact grade, Partial least squares PLS, Power spectra, Pulse-Echo ultrasound, Screw dental implant stability, Spectral analysis, Spectroscopy, Stiffness grade
National Category
Medical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-154341Scopus ID: 2-s2.0-84896986212OAI: oai:DiVA.org:kth-154341DiVA: diva2:756578
Note

QC 20150414

Available from: 2014-10-17 Created: 2014-10-17 Last updated: 2017-12-05Bibliographically approved

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Hamid Muhammed, Hamed

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