The purpose of this study was to clarify the relationship between extraordinary occlusal contact and temporomandibular dysfunction (TMD) symptoms. Of 258 persons with and without TMD, the occlusal contacts, in the intercuspal position (ICP), protrusive position and lateral position, the orofacial pain and the articular disk displacement in TM J were recorded, and analyzed by quantification theory II. As for the true rate, F value and discriminative coefficient, the results were as follws:1. Relationship to Orofacial Pain1) True rateThe true rate was about 70%.2) F value and discriminative coefficientIn the ICP, the F value was high at the 2nd molar. In the lateral position, it was high at the working side canine and at the 2nd molar on the balancing side.2. Relationship to Disk Displacement1) True rateThe true rate was the highest at the lateral position.2) F value and discriminative coefficientIn the ICP, the F value was high at the 2nd molar.In the lateral position, the F value was highest at the working side canine followed by the 1st premolar on the working side in relation to the working and both side disk displacement and the 2nd molar on the balancing side in relation to the balancing side disk displacement.