NDLI: In vivo characterization of the electrical impedance between the electrodes of the electronic foramen locators

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Non-invasive estimation of intracranial pressure in traumatic brain injury (TBI) using fully-anisotropic Morlet wavelet transform and support vector regression

Biomedical Engineering Letters : Volume 3, Issue 2, June 2013

Biomedical Engineering Letters : Volume 3, Issue 1, March 2013

Biomedical Engineering Letters : Volume 2

Biomedical Engineering Letters : Volume 1

In vivo characterization of the electrical impedance between the electrodes of the electronic foramen locators

Content Provider	Springer Nature Link
Author	Gamba, Humberto R. Rambo, Marcos V. H. Borba, Gustavo B. Maia, Joaquim M. Ramos, Carlos A. S.
Copyright Year	2013
Abstract	Electronic foramen locators are widely used to locate the apical foramen (AF), by measuring the electrical impedance between the electrodes (Z $_{E}$). There is no in vivo study that completely characterizes Z $_{ E }$ as a function of frequency and endodontic file tip position. The results of in vivo studies of the impedance Z $_{ E }$ and a coefficient that can be used to locate the AF are presented.An electronic device was specially built to study Z $_{ E }$. Ten root canals were used in the experiment. The spectral attenuation of Z $_{ E }$ was in vivo measured with the endodontic file tip placed at −3.0, −2.5, −2.0, −1.5, −1.0, −0.5 and zero millimeters from the root canal AF. At each file position the spectrum attenuation was modeled. Based on the attenuation models an endodontic spectral attenuation coefficient (ESAC) was defined.The in vivo results demonstrate that the spectral attenuation of the electrical impedance Z $_{ E }$ has an exponential decay in the frequency range of the study. It was verified that ESAC can be correlated to the distance between the endodontic file tip and the apical foramen. The ESAC accuracy was assessed and the results showed that it can locate the AF with accuracy better than 0.5mm.The spectral attenuation of Z $_{ E }$ has an exponential decay for all file tip distances from the AF. It supports the feasibility of ESAC to accurately locate the root canal AF. Moreover, using frequencies steps of one octave makes the implementation of ESAC in an embedded system easier.
Starting Page	170
Ending Page	178
Page Count	9
File Format	PDF
ISSN	20939868
Journal	Biomedical Engineering Letters
Volume Number	3
Issue Number	3
e-ISSN	2093985X
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-10-09
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Apical foramen Endodontics Electronic foramen locators Bioimpedance Impedance assessed by foramen locators Biomedical Engineering Biophysics and Biological Physics Biomedicine general Medical and Radiation Physics
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering

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