アブストラクト（35巻2号：The Bulletin of Kanagawa Dental College）

The Bulletin of Kanagawa Dental College

English

Title　： Measurement Error in a Newly Developed Mandibular Motion Tracking System
Subtitle　： ORIGINAL ARTICLES
Authors　： Ken-ichi Minaguchi*, Kenji Fushima**, Masaru Kobayashi***
Authors（kana）　：
Organization　： *Tsujiuchi Dental Clinic, **Kanazawa Orthodontic Clinic, ***Department of Oral & Maxillofacial Surgery, Kanagawa Dental College
Journal　： The Bulletin of Kanagawa Dental College
Volume　： 35
Number　： 2
Page　： 129-137
Year/Month　： 2007 / 9
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： [Abstract]Objectives: A new mandibular motion tracking system (ManMoS) has been developed. The aim of this study was to evaluate the measurement errors for ManMoS. Methods: FASTRAK, a three-dimensional motion tracking and digitizing equipment was utilized for the ManMoS. A motion data set was recorded in six-degrees-of-freedom with three coordinates (X, Y and Z) and three Euler angles (azimuth, elevation and roll). The measurement errors were examined for the tracking device itself and the whole system. In order to examine the accuracy of the whole system, a FASTRAK receiver was fixed on the lower dental arch and the motion of the left condyle was analyzed. An investigation was carried out of the system noise of ManMoS and reproducibility of the condylar point. Results: FASTRAK showed little noise for the coordinates and the Euler angles. In the linear measurements of 100mm and the angular measurements of 90.0 degrees, the average of error between the measured data and the actual value ranged from -0.308mm to 0.136mm and from -0.134 degrees to 0.010 degrees respectively. The static noise in ManMoS assessed at the condylar point was less than 0.122 mm. For the reproducibility of the condylar positioning to ICP during the tapping, the standard deviations of each the X, Y and Z coordinates in twenty-five biting events were 0.102mm, 0.213mm and 0.198mm. The condylar path was well represented graphically on a CRT monitor. Conclusions: The accuracy of ManMoS seems to meet clinical demands satisfactorily. The system was simple to operate and recordings were made rapidly, as a consequence ManMoS was considered suitable for clinical examinations.
Practice　： Dentistry
Keywords　： Motion tracking, Measurement error, Mandible, Condylar path, Orthognathic surgery