Jaw Tracking (Electrognathography) equipment allows the dentist to track lower jaw movements three dimensionally, as the jaw traverses through space.
Computerized mandibular scanning (CMS) measures jaw positions relative to one’s habitual bite position (or centric occlusion or CO).this computerized technology measures 3-D movement of mandible as it travels from rest to habitual centric. It tracks the mandibular movements via a small tiny magnet that is placed on front of lower teeth along with a jaw tracking device called a sensor array.It is used to help diagnose if a person has a TMJ related disorder.
Jaw tracker
With this understanding, the doctor can better design an oral appliance to rehabilitate the TMJ and secure it in an aligned and comfortable position.
JT-3D records incisor-point movements
The all-new JT-3D records incisor-point movements in three dimensions. A small magnet, attached to the labial surfaces of the mandibular incisors, is tracked by an array of sensors to produce vertical, antero-posterior and lateral components of movement. It mounts simply, yet securely on the head, and provides an incredibly stable base for the sensors. This provides spectacular resolution even on the smallest of mandibular movements.
function harmony
Axis of Rotation
Tracking the jaw gives the following advantages.
Arc of closure
Deduction: Maxilla must follow the angle of occlusal plane of mandible (the dynamic arm) and not vice versa, hence should offer the same plane that the closure plane of mandible offers as the landing plane for mandible. Currently the opposite is followed. Hence the Jaw Tracking.
Observing the path of closure or opening can educate one on wandering of the jaw –Z wandering. This leaves one to deduce if that is triggered by disc snapping or muscular spasm or uncoordinated muscular action. Or a wandering near closure will educate one on presence or absence of guide planes. ( conversely presence or absence of interferences)
This indicates necessity of adjusting the maxillary plane according to the mandibular plane of seating and not vice versa as done in face bow transfers.