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KMID : 0352119930090030303
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Journal of Kyung Hee University
1993 Volume.9 No. 3 p.303 ~ p.313
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A Study on the Recordings of Mandibular Movement using Pantograph
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Abstract
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In is necessary to know deeper on the prosthetic restoration and diagnosis, treatment, prevention for the abnormality of TM joint. Therefore, when prosthetic restoration is done, mandibular movement which is possible to be revived and functional
movement are recorded and showed into the angle of articulator to be used for the production of prosthesis, occlusal correction and analysis.
I studied the difference between true and arbitrary terminal hinge axis point, using pantograph (Denar Co. U. S. A) which is one of the way to record the amndibular movement. Ten subjects (8 men and 2 women) were the subject of this study. They
have
something in common as following.
* The had relatively clear intercuspal position.
* They didn't have functional anomality and past history on masticatory system and TM joint.
* They didn't have intraoral prosthesis like single crown.
Three subjects whose posterior occlusal surface was not restorated and have a clear shape were selected to study the relation between tooth morphology and pantographic records which were noted during mandibular movement, using pantograph.
1) As compared with the average of the arbitrary hinge point which was located 0.5inch anterior and 5mm lower from tragus on the trageal-canthus line, the average of true hinge point of the 10 subjects (20 TM joints) was 1.30mm posterior and
1.13mm
lower (1.73mm posterior and 1.1mm lower at the right side, 0.86mm posterior and 1.15mm lower at the left side).
2) Average of true hinge point of subjects was very similar with the arbitrary hinge point of Denar company.
3) Acording to the pantographic records, there was relationship between the orbiting path of the sagittal plane (condylar guidance) and posterior cusp height.
4) Acording to the pantographic records, there was relationship between the rotating path of the posterior horizontal plane and angle of mediotrusive and laterotrusive path.
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