Abstract
A comparison study of the information obtained from transpharyngeal, transmaxillary and oblique lateral transcranial projections of the temporomandibular joint was made. A new technique for the transpharyngeal projection is suggested in order to reduce the radiation dose and to make the projection reproducible. The material comprised 87 patients having a diagnosis of temporomandibular joint disorders. Most structural changes were detected in the transcranial projection, with the transmaxillary projection found to be the most complementary. Radiographic involvement of the fossa and articular eminence was not revealed in the transpharyngeal projection. The presence of osteophytes was found predominantly in the transcranial projection, followed by sclerosis and flat-tenings. Erosions were revealed almost twice as often in the transmaxillary projection than in either of the other two projections. In order of preference, the transcranial projection is recommended if only one of the discussed projections is to be used, followed by the transmaxillary and transpharyngeal projections. It is suggested, however, that more than one projection should be used to increase the required amount of information.
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