磁気空間位置検出装置を応用した６自由度顎運動測定装置の開発

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  • Newly Designed Jaw Tracking System with Six-degree-of-freedom Based on a Low-frequency Magnetic Transducing Technology

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Purpose: The purpose of this study was to develop a new jaw tracking system with six-degree-offreedom, which had a simpler structure and eary operation.<BR>Materials and Methods: 3 SPACE®FASTRAK®(Polhemus Inc.) was used to construct a new jaw tracking system. This system consists of a transmitter, two sensors, a system electronics unit, and a personal computer. Two sensors are fixed on the labial surface of upper and lower incisors by using a resin splint. When the transmitter and the sensor were positioned 300 mm apart, total measurement errors were revealed to be minimum and these values for distance and for angle were less than 100μm and 0.2 degree, respectively.<BR>Discussion: Comparing the system with other jaw tracking systems on the market, the advantages of the system are: 1) since the sensor is small and lightweight, this apparatus causes minimum interference to the subject during measurement; 2) the mandibular movement can be reproduced as a movie on the CRT just after completing the measurement; 3) the kinematic axis can be automatically searched by using an original software.<BR>Conclusions: A newly designed measurement system with six-degree-of-freedom was developed based on a low-frequency magnetic transducing technology. Both the hardware and software of the system showed good performance and high accuracy.

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