TMJ arthrography has been performed with a surgical X-ray television system (fluoroscope) and a tomographic apparatus for patients with disturbance of opening of the mouth. Limited cone beam X-CT for dental use (Ortho-CT) developed by Arai et al, is small and very effective for the small ma.f.illofacial area. We performed TMJ arthrography by using Ortho-CT for TMD patients, and obtained good results, compared with those of MRI. Objects were 13 joints in 12 patients diagnosed as having TMD. As a result, there was a high percentage of agreement with figure and position of the articular disk and it was certain that Ortho-CT had the accuracy similar to that of MRI, because there was no statistically significant difference. We conclude that Ortho-CT is very effective for TMJ arthrography.
