Piezo-actuated device for a bio-structural monitoring application through vibration-based condition and electromechanical impedance measurements

Barco, Daniel R.; Tinoco, Héctor A.; Cardona, Carlos I.; Peña, Fabio M.

doi:10.1088/1757-899x/657/1/012031

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…The proposed main idea in Fig. 2, subsequently will help to demonstrate that the bone alterations can be monitored using the teeth as probes, since if the bone structure changes ( Z M s ( ) ), the new vibratory conditions (changes in Z M Pa ( ) ) will modify the electrical impedance Z E P ( ) of the piezoelectric patch, as evidenced by Tinoco et al [31] and Barco et al [44]. Bone alterations are assumed as the changes in BMD, which affect its structural condition and the natural quality.…”

Section: Monitoring Of Bone Mineral Alterations Through Emi Techniquementioning

confidence: 99%

Bio-structural monitoring of bone mineral alterations through electromechanical impedance measurements of a Piezo-device joined to a tooth

et al. 2020

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Bone presents different systemic functionalities as calcium phosphate reservoir, organ protection, among others. For that reason, the bone health conditions are essential to keep in equilibrium the metabolism of several body systems. Different technologies exist to diagnose bone conditions with invasive methods based on ionizing radiation. Therefore, there is a challenge to develop new ways to evaluate bone alterations in a noninvasive form. This study shows the assessment of a piezo-actuated device acting on a human tooth for the bio-monitoring of bone alterations. The bone diagnosis is performed by applying the electromechanical impedance technique (EMI), commonly used in structural health monitoring. For the experimental tests, five bone samples were prepared, and one was chosen as the monitoring. All samples were put in a decalcifying substance (TBD1 acid-base) at different times to emulate localized bone mineral alterations. Bone reductions were computed by using X-ray micro-computed tomography analyzing the morphometry. Electrical resistance measurements (piezo-device) were taken for the monitoring specimen meanwhile it was partially decalcified during 8520 seconds. In the frequency spectrum, several observation windows showed that the bone alterations gradually changed the electrical resistance signals which were quantified statistically. Results evidenced that the bone density changes are correlated with the electrical resistance measurements; these changes presented an exponential behavior as much as in the calculated index, and bone mineral reduction. The results demonstrated that bone alterations exhibit linear dependence with the computed statistical indexes. This result confirms that it is possible to observe the bone changes from the teeth as a future application.

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Section: Monitoring Of Bone Mineral Alterations Through Emi Techniquementioning

confidence: 99%

Bio-structural monitoring of bone mineral alterations through electromechanical impedance measurements of a Piezo-device joined to a tooth

et al. 2020

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“…In this study, the electrical resistance is taken as an analysis parameter since it has shown to be more sensitive than reactance measurements. [30,31] demonstrated the effectivity of the electrical resistance to detect structural variations in substrates. The variations of the pattern signal w R s E ( ) can be estimated with the j index (see equation (2)), by comparing two electrical resistance signals; the reference (pattern signal), and the monitoring signal.…”

Section: Decoupling Electromechanical Impedance Signalsmentioning

confidence: 99%

“…Other authors have developed methods for monitoring structural variations through teeth used as biological probes coupled to different substrates [28][29][30]. In this application, a bracket-beam piezoelectric sensor is mounted to the tooth's crown to measure the mechanical response of the substrate between 5-10 kHz.…”

Section: Introductionmentioning

confidence: 99%

Electromechanical impedance measurements for bone health monitoring through teeth used as probes of a Piezo-device

Cardona

Tinoco

Marín-Berrio

et al. 2020

Biomed. Phys. Eng. Express

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Bone is a dynamic biological tissue that acts as the primary rigid support of the body. Several systemic factors are responsible for pathologies that negatively affect its structural attributes. Although the bone is in continuous renewal by osteogenesis, metabolic diseases are the most common affectations that alter its natural equilibrium. Different techniques based on ionizing radiation are used for the bone diagnosis restrictively. However, if these are not used adequately, the application could present risks for human health. In this paper, it is proposed and explored a new technique to apply an early-stage diagnosis of bone variations. The technique evaluates bone structural conditions from the teeth (used as probes) by applying a structural health monitoring (SHM) methodology. An experimental procedure is described to identify the stiffness variations produced by mechanical drillings done in prepared bone samples. The identification is carried out applying the electromechanical impedance technique (EMI) through a piezo-actuated device in the frequency spectrum 5–20kHz. Three bone samples with incorporated teeth (three teeth, two teeth, and one tooth) were prepared to emulate a mandibular portion of alveolar bone-PDL (periodontal ligament)-tooth system. Piezo-device was attached to the crown of the tooth with an orthodontic bracket allowing the teeth to act as probes. The electrical resistance measurements were computed with an electrical decoupling approach that improved the detection of the drillings; it was due to the increment of the sensitivity of the signals. The results showed that the bone mass reduction is correlated with statistical indices obtained in specific frequency intervals of the electrical resistance. This work suggests the possibility of a future application addressed to a bone diagnosis in a non-invasive way.

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Identification of Bone Density Changes Applying Impedance Spectroscopy with a Piezo-Device Coupled to a Human Tooth

Ortiz-Jimenez

Tinoco

Cardona

et al. 2021

JBBBE

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Bone tissue is a calcium deposit and supporting structure of the human body, it is exposed to several pathologies that modify its mineral content. To determine these changes, different diagnostic procedures are performed with techniques using invasive ionizing radiation, which are limited by the negative effects in the long term on human health. A methodology is explored that could be applicable in the diagnosis of pathologic variations in bone mineral density, using structural monitoring tools. The proposed technique estimates changes in bone conditions by applying impedance spectroscopy with a tooth-borne piezo-device. Bone-tooth samples were prepared to simulate a section of maxillary bone and subsequently treated with chemical agents, simulating pathologic decalcification. The piezo-device is inserted in the slot of an orthodontic bracket, previously bonded to the crown of the tooth, in order to transmit vibration to surrounding bone. The variations in bone micro-architecture were computed by image processing analyzed with samples prepared in transparent resin, allowing the measurement of morphometry before and after the induced changes in mineral content. Using vibrational bone response, impedance measurements allowed to observe the variations in bone mass as the samples were progressively decalcified. In the 5-50kHz spectrum, it was demonstrated the sensitivity of the electro-mechanical impedance during the bone alteration procedure since the electrical resistance signals of the piezo-device consistently changed in the frequency spectrum (5-50kHz). The piezo-device shows to be sensitive to the changes produced by the bone alterations, which were caused by the stiffness variations made in the sample during the decalcifying. These changes were statistically correlated to demonstrate that in a less invasive way, bone alterations could be monitored from the teeth. This result opens the door to search for a new way to diagnose bone density changes in real applications.

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Piezo-actuated device for a bio-structural monitoring application through vibration-based condition and electromechanical impedance measurements

Cited by 3 publications

References 18 publications

Bio-structural monitoring of bone mineral alterations through electromechanical impedance measurements of a Piezo-device joined to a tooth

Bio-structural monitoring of bone mineral alterations through electromechanical impedance measurements of a Piezo-device joined to a tooth

Electromechanical impedance measurements for bone health monitoring through teeth used as probes of a Piezo-device

Identification of Bone Density Changes Applying Impedance Spectroscopy with a Piezo-Device Coupled to a Human Tooth

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