title: [Application of a jaw motion tracking device that measures six degrees of freedom using optoelectronic].
abstract: OBJECTIVE
  A jaw motion tracking device that measures six degrees of freedom has recently been developed. Understanding jaw motion is useful, but previous measurement methods were impractical for use in dental clinics. The overall aim of this study was to demonstrate the simple operation, low cost, and high precision of a recently developed jaw tracking device. In addition, this study explored its potential clinical applications.
  
  
  METHODS
  In this study, we compared two jaw motion tracking devices: a digital system type of device and an optical type of device. First we established a baseline occlusal plane from which to measure jaw motion in the same subject with both devices. The jaw motion signals were sampled at a frequency of 100 Hz. The subjects were three healthy women (mean age +/- SD = 26.3 +/- 1.2 years) who were recruited from among the crown-and-bridge faculty of Tsurumi University of Dentistry. The jaw motions measured were open-close movement, sagittal border movement, and frontal border movement. In addition, the kinematic axis point was calculated from the sagittal border movement. Data from the digital system type of device and data from the optical device were compared. The data were selected to measure rotation and translocation, i.e. jaw position about protrusion, both laterotrusion and maximal opening of the mouth.
  
  
  RESULTS
  The root mean square (RMS) error of position measurement was 0.163 mm with MM-JI-E and 0.178 mm with the optical type of device. The RMS error of jaw motion measurement with the optical type of device was maximum at 0.8mm and minimum at 0.1mm. This was similar to that with digital system type of jaw motion tracking device.
  
  
  CONCLUSIONS
  This study showed the possibility of developing clinical applications for this jaw motion device.
authors.affiliation: The Second Department of Prosthetic Dentistry, Tsurumi University School of Dentistry. ogawa-t@tsurumi-u.ac.jp
authors.forename: Takumi
authors.initials: T
authors.lastname: Ogawa
authors.forename: Yuko
authors.initials: Y
authors.lastname: Shigeta
authors.forename: Eriko
authors.initials: E
authors.lastname: Ando
authors.forename: Shinya
authors.initials: S
authors.lastname: Hirai
authors.forename: Mayumi
authors.initials: M
authors.lastname: Suma
authors.forename: Rio
authors.initials: R
authors.lastname: Hirabayashi
authors.forename: Tomoko
authors.initials: T
authors.lastname: Ikawa
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Hosoda
authors.forename: Jirou
authors.initials: J
authors.lastname: Araki
authors.forename: Kousuke
authors.initials: K
authors.lastname: Itoh
authors.forename: Shu
authors.initials: S
authors.lastname: Kamei
authors.forename: Shunji
authors.initials: S
authors.lastname: Fukushima
authors.forename: Takeshi
authors.initials: T
authors.lastname: Moriyama
authors.forename: Iori
authors.initials: I
authors.lastname: Saito
authors.forename: Harunobu
authors.initials: H
authors.lastname: Kumeda
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007568:Jaw / Q000502:physiology*; D009038:Motion; D055096:Optical Devices; D055095:Optics and Photonics; D011476:Prosthodontics / Q000295:instrumentation