Wireless Unconstrained Monitoring of Intra-oral Temperature Using Thermistor and Telemeter Sealed in Mouthguard

Iitani, Kenta; Kishima, Kanako; Kasuga, Yuka; Yokota, Kumi; Nitta, Hiroki; Onchi, Kohki; Kawase, Gentaro; Umezawa, Kouta; Toma, Koji; Arakawa, Takahiro; Dao, Dzung Viet; Mitsubayashi, Kohji

doi:10.18494/sam4218

Cited by 1 publication

(1 citation statement)

References 27 publications

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“…The wireless module for the MG-type sensor functions as an A/D converter, potentiostat, and wireless transmitter using Bluetooth Low Energy (BLE), similar to those in the previous paper [ 21 , 22 ]. A constant voltage of 800 mV was applied to the PT using the wireless module, and the output current was evaluated as an output representing turbidity.…”

Section: Methodsmentioning

confidence: 99%

Mouthguard-Type Wearable Sensor for Monitoring Salivary Turbidity to Assess Oral Hygiene

Ichikawa,

Iitani,

Kawase

et al. 2024

Sensors

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Salivary turbidity is a promising indicator for evaluating oral hygiene. This study proposed a wearable mouthguard-type sensor for continuous and unconstrained measurement of salivary turbidity. The sensor evaluated turbidity by measuring the light transmittance of saliva with an LED and a phototransistor sealed inside a double-layered mouthguard. The sensor was also embedded with a Bluetooth wireless module, enabling the wireless measurement of turbidity. The mouthguard materials (polyethylene terephthalate-glycol and ethylene-vinyl acetate) and the wavelength of the LED (405 nm) were experimentally determined to achieve high sensitivity in salivary turbidity measurement. The turbidity quantification characteristic of the proposed sensor was evaluated using a turbidity standard solution, and the sensor was capable of turbidity quantification over a wide dynamic range of 1–4000 FTU (formazine turbidity unit), including reported salivary turbidity (400–800 FTU). In vitro turbidity measurement using a saliva sample showed 553 FTU, which is equivalent to the same sample measured with a spectrophotometer (576 FTU). Moreover, in vivo experiments also showed results equivalent to that measured with a spectrophotometer, and wireless measurement of salivary turbidity was realized using the mouthguard-type sensor. Based on these results, the proposed mouthguard-type sensor has promising potential for the unconstrained continuous evaluation of oral hygiene.

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Section: Methodsmentioning

confidence: 99%