title: The accuracy with which the human condyle can be expressed in the coordinate system of JAWS3D using a unilateral fiducial marker.
abstract: Previous studies have indicated that the selection of condylar referencing points can significantly influence condylar point trajectories, and the use of radiographically determined condylar points is essential for accurate representation of condylar movement. The aim of this investigation was to determine the accuracy with which the three-dimensional locations of condylar points could be determined in the coordinate system of the JAWS3D tracking device when an ipsilateral fiducial marker is used. A perspex mandible containing condylar radiographic markers was constructed. A JAWS3D target frame and a fiducial marker, supporting radiographic markers, were secured to the perspex mandible. The image data from computer tomography scans of the condyles and fiducial marker, together with photographs of the fiducial marker and the JAWS3D target frame were used to calculate condylar point coordinates in the JAWS3D coordinate system. These data were then compared with the data obtained by direct measurement of the condylar radiographic markers in the JAWS3D coordinates. The results suggest that a unilateral fiducial marker is sufficient to allow the registration of ipsilateral condylar point coordinates to an accuracy of approximately 1.0 mm.
authors: Jaw Function and Orofacial Pain Research Unit, University of Sydney, Westmead Centre for Oral Health, Westmead, NSW, Australia.
authors: W
authors: W
authors: Swintara
authors: C W
authors: CW
authors: Johnson
authors: G M
authors: GM
authors: Murray
authors: B Y
authors: BY
authors: Huang
mesh_terms: D002508:Cephalometry / Q000295:instrumentation / Q000379:methods*; D003287:Contrast Media; D003626:Data Display; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation / Q000379:methods; D016014:Linear Models; D008335:Mandibular Condyle / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000502:physiology; D008953:Models, Anatomic; D009068:Movement; D010781:Photography / Q000295:instrumentation; D012399:Rotation; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media