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The purpose of this study was to investigate the quantitative occlusal condition of patients with internal derangement of TMJ. To achieve this purpose, the shape of the occlusal table of the upper molars was scanned, and reference points were obtained and compared with the 3-dimensional movement of the mandible in a lateral occlusal position when a fixed incisal point was 2mm distant from the intercuspal position. Eighteen subjects with internal derangement of TMJ: the patient group, and eighteen asymptomatic subjects: the control group, were selected for this investigation.The results were as follows: 1) the angle of the condylar path of the nonworking side and the path of the lower molars on the nonworking side was larger in the patient group than in the control group ; 2) the inclination of the cusp slope of the upper molars of the nonworking side in the patient group tended to be larger than that of the control group, especially in the second molar, where this difference was statistically significant ; 3) the interocclusal distance between upper and lower second molars in the nonworking side of the patient group tended to be smaller than that of the control group, but it was statistically insignificant.

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A Study on the Effect of Occlusal Interference Concerning Distance between Upper and Lower Molars during Lateral Excursion of Patients with Internal Derangement of TMJ.