Force Sensor Design and Measurement for Endodontic Therapy

Chih-Chiang Tsao*, Fang-Yu Lin, Ji-Wei Liou, Ping-Han Wen, Tzong-Shi Liu, Chieh-Chung Peng

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Scopus citations


To assist endodontic therapy, in this paper, a force sensor is designed and fabricated for measuring the axial force and the bending moment simultaneously. By detecting the bending moment, we can know the severity of bending. Axial force detection is also desired, as excessive axial forces may result in instrument buckling or even root canal perforation. This paper installs three sensing cells in each of two planes to detect the bending direction. Each sensing cell consists of a pressure-sensitive electric conductive rubber and an electrode. The size of the force sensor is 1.4-mm wide and 6-mm high for matching the size of endodontic instruments and making it feasible in the endodontic treatment. Experimental results on accuracy, repeatability, and nonlinearity are presented to validate the proposed sensor.
Original languageEnglish
Pages (from-to)2636-2642
JournalIEEE Sensors Journal
Issue number7
StatePublished - Jul 2013


  • Force sensor; endodontic therapy; piezoresistive; bending sensing

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    Tsao, C-C., Lin, F-Y., Liou, J-W., Wen, P-H., Liu, T-S., & Peng, C-C. (2013). Force Sensor Design and Measurement for Endodontic Therapy. IEEE Sensors Journal, 13(7), 2636-2642.