A basic study for estimation of occlusal force using an ear wearable sensor

• Published in: Electronics and communications in Japan Vol. 101; no. 11; pp. 20 - 27
• Main Authors: Taniguchi, Kazuhiro, Kurosawa, Mami, Kimura, Yutaka, Nishikawa, Atsushi
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 01.11.2018
• Subjects: Converters; Correlation coefficients; Ear; ear canal; Earphones; Least squares method; Mastication; Measuring instruments; occlusal force; Occlusion; optical measurement; Sensors; wearable device; Wearable technology
• DOI: 10.1002/ecj.12120
• ISSN: 1942-9533

We aim to develop earphone type wearable devices for measuring occlusal force. In this article, we investigated the correlation between occlusal force and the movement of the ear canal as a basic study to estimate the occlusion force. The proposed estimation method uses the least squares method and the weighted average. We developed an experimental device for simultaneously measuring occlusal force and the movement of the ear canal. This device primarily consists of an occlusal force sensor and a wearable ear sensor, and converts analog signals from both sensors into digital signals using an analog‐to‐digital (AD) converter, then records the data as signals associated with measurement time. The experiment involved six subjects, who performed chewing of the occlusal force sensor five times, for 2 seconds. The occlusal force sensor was placed at the right second molar, with the wearable ear sensor placed on the right ear. Through the experiment, the occlusion and the ear canal movement were found to have a strong correlation. The average correlation coefficients consistently exceeded 0.89 for all subjects.