[The development of a device for condylar movement by electro-magnetic field. 1. Outline and characteristics of the device].
It is very important for clinical diagnosis to record and analyze condylar movement in cranio-mandibular disorders. Recently, many devices have been developed for this purpose. These devices can measure precisely condylar movements, but are difficult to manipulate. We have developed a simple device which substitute a palpation of the posterior aspect of the TMJ. We modified the Cardiokymograph which use electro-magnetic field. The characteristics of this device are the use of a frequency-variable crystal-controlled oscillator, and the application of the coil itself which is a part of the oscillator as a probe. We tested many electrical characteristics of this device and assured the effectiveness, that is, sensitivity, directivity, frequency response characteristic, transient response characteristic, and temperature response characteristic. We tried to insert a probe into the external auditory meatus, and record condylar movement as a positional change of the skin. It seems to suggest that our device can record a feature of condylar movement.
Nomura
A
A
1st Department of Prosthetic Dentistry, School of Dentistry, Niigata University.
Hayashi
T
T
Nomura
S
S
Ishioka
K
K
Saitoh
Y
Y
D004574:Electromagnetic Fields; D004582:Electronics, Medical; D006801:Humans; D008335:Mandibular Condyle / Q000502:physiology*; D009068:Movement; D009991:Oscillometry / Q000295:instrumentation; D010173:Palpation / Q000295:instrumentation*; D013704:Temporomandibular Joint / Q000502:physiology; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis* / Q000503:physiopathology