The purpose of this study was to evaluate the size of the temporomandibular joint space by the increase of the occlusal force on the working side and the non-working side during unilateral biting. For the study. 22 normal adults, age from 23 to
25, who
had normal or class I molar relationship and had no symptoms on TMJ area and masticatory muscles were selected. Transcranial TMJ radiograph was taken during unilateral biting with the sensor of occlusal load measuring device(MPM-3000; Nihon
Kohden
Kogyo
Co. Ltd., japan) on lst molar teeth of right and left side given the force of 0kg, 10kg, 20kg and 30kg respectively with Accurad-200(Denar Corperation's product). The radiographs were traced on the screen, with enlarged as 5 times. The size of
temporo-mandibular joint space at anterior, superior and posterior compartment were measured with Dumas's method(reference line between squamotympanic fissure and the lowest point of articular eminence).
@ES The following results were obtained by this study.
@EN 1. The size of anterior TMJ space showed a tendency to decrease on the working side and increase on the non-working side by the increase of the occlusal force, but had no statistical significancy(P>0.05).
2. The size of superior TMJ space showed a tendency to increase on the working side and decrease on the non-working side by the increase of the occlusal force(P<0.05).
3. The size of posterior TMJ space showed a tendency to decrease on both working and non-working side, but had no statistical significancy(P>0.05).
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