Fiber-Optic Intracranial Pressure Monitoring System Using Wi-Fi—An In Vivo Study

Silva, Erasmo Barros da; Hamasaki, Eder Eidi; Smaili, Hamzah Youssef; Wozniak, Arthur; Tristão, Enézio Satoru Yoshida; Loureiro, Marcelo de Paula; Milano, Jerônimo Buzetti; Meneses, Murilo S.; Oliveira, Rafael Martinelli de; Ramina, Ricardo

doi:10.1227/neu.0000000000002250

Cited by 1 publication

(1 citation statement)

References 79 publications

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“…In‐fiber Bragg (FBG) sensors provide the opportunity to measure strain within the periodontal space in situ. The small size (0.125 mm diameter), chemical inertness and biocompatibility of FBG sensors enable their use in several biomechanical and biomedical applications (da Silva Junior et al, 2023; Hill & Meltz, 1997; Hui et al, 2020; Mishra et al, 2010). FBG sensors include a silica core embedded in an optical fiber and permanent gratings are written into this core through periodic changes in the refractive index (Hill & Meltz, 1997).…”

Section: Introductionmentioning

confidence: 99%

In vivo measurement of strain in the periodontal space of pig (Sus scrofa) incisors using in‐fiber Bragg sensors

Popowics,

Hwang,

et al. 2024

Journal of Morphology

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The incisor teeth in pigs, Sus scrofa, function in association with a disc‐shaped snout to explore the environment for potential food. Understanding how mechanical loading applied to the tooth deforms the periodontal ligament (PDL) is important to determining the role of periodontal mechanoreceptors during food exploration and feeding. The objective of this study was to use fiber Bragg (FBG) sensors to measure strain in vivo within the PDL space of pig incisors. The central mandibular incisors of pigs underwent spring loaded lingual tipping during FBG strain recording within the labial periodontal space. FBG sensors were placed within the periodontal space of the central mandibular incisors of ~2–3‐month‐old farm pigs. The magnitude and orientation of spring loads are expected to mimic incisor contact with food. During incisor tipping with load calibrated springs, FBG strains in vitro (N = 6) and in vivo (N = 6) recorded at comparable load levels overlapped in range (−10–20 με). Linear regressions between peak FBG strains, that is, the highest recorded strain value, and baseline strains, that is, strain without applied spring load, were significant across all in vivo experiments (peak strain at 200 g vs. baseline, p = .04; peak strain at 2000 g vs. baseline p = .03; peak strain at 2000 g vs. 200 g, p = .004). These linear relationships indicate that on a per experiment basis, the maximum measured strain at different spring loads showed predictable differences. A Friedman test of the absolute value of peak strain confirmed the significant increase in strain between baseline, 200 g, and 2000 g spring activation (p = .02). Mainly compressive strains were recorded in the labial PDL space and increases in spring load applied in vivo generated increases in FBG strain measurements. These results demonstrate the capacity for FBG sensors to be used in vivo to assess transmission of occlusal loads through the periodontium. PDL strain is associated with mechanoreceptor stimulation and is expected to affect the functional morphology of the incisors. The overall low levels of strain observed may correspond with the robust functional morphology of pig incisors and the tendency for pigs to encounter diverse foods and substrates during food exploration.

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