Nihon Hotetsu Shika Gakkai Zasshi

The purpose of this study was to develop a more scientific system which can objectivley catch the biophysical qualities of the tooth supporting structures.
A new spring-driven impactor for exciting a tooth was tested. A system for measuring tooth response was developed.
As the result, the system was suitable for clinical studies and applicable without difficulties.

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Patients with TMJ disfunction or toothache have been treated by Acupuncture theraphy at the Pain Clinic in Osaka Dental University.
This Acupuncture theraphy is practiced by inserting the needle on the acupoint ST III (No.7) approximately 3540mm depth and stimulating with low frequency electric current. The acupoint ST III (No.7) is located in the center of the half-round area between the mandibular notch of the mandible and the malar arch.
Authors took an interest of the possibility of locating of the needle into the lateral pterygoid muscle during Acupuncture therapy.
And EMG recording of the lateral pterygoid muscle was tried through this needle as an electrode. EMG activity through the needle electrode was appeared during the protrusive movement of the mandible and the Jaw opening movement.
And this EMG activity was an antagonistic realtionship with that of the posterior part of the temporal muscle during anterior-posterior and lateral mandibular movement.
From these two facts, the EMG waves through the needle electrodes were proved to be the activity of the lateral pterygoid muscle.

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The purpose of this study was to evaluate EMG visual biofeedback (VBF) effects on the treatment of TMJ dysfunction. During a voluntary gum chewing (NBF) and VBF training (BF), EMG from the bilateral masseter and posterior temporal muscles were simultaneously recorded with MKG motion and visualized by MASTICATOGRAPH displaying the power coordination pattern among the four muscles per strokes.
Eight patients were instructed to watch their own patterns with an effort to convert them into normal ones. Such a training was performed for seven sessions at weekly interval.
1) The abnormal EMG power coordination patterns were successively converted into the normal ones representing significant prominence of working-sidemasseter followed by the other three muscles in activity.
2) The grinding-likestrokes seen at the first session were changed into the chopping-like ones with higher synchronicity in onset and offset of EMG bursts at the final session.
3) The chewing motion became more reproducible and rhythmical successively.
4) Above-mentioned findigs were observed in close agreement with the course of recovery in symptoms.As a general trail of this remedy, it was specurated that desirable effects by VBF training might be noticeable since fifth or sixth session, andNBF-values also might recover close behind the normalized BF-values in the latersessions.

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