1986 Volume 32 Issue 12 Pages 2239-2257
There are many studies in the literature of temporomandibular joint (TMJ) roentgenography which reported various methods. Schuller's method is one of the routine techniques in TMJ roentgenography, but it was designed for otological diseases rather than for TMJ. The purpose of my study is the determination of a suitable angle of X-ray incidence in lateral oblique transcranial projection (LOTP) that indicates the normal rest position in between the codyle and articular fossa. Thirty five dry skulls were examined in various angles of X-ray incidence in LOTP and the film images were analysed by computer and visual evaluation. The results showed that an angulation of 15 degrees with LOTP of TMJ was more suitable than the 25 degree angle which is ordinarily used. This method produced the obvious images of the shapes of articular condyle and condylar fossa, and also the reproducibility of TMJ position was improved when head supports were used. The coincidence was recognized in images of both tomography and LOTP for the relationship of condyle and fossa, but the method was unable to exhibit obviously the internal surface of condylar head, which should be given particular attention. I believe that this method is useful as the bases of TMJ roentgenography on the screening of the clinical diagnosis of TMJ disorders, since the disease of TMJ disorders is usually recognized on the external surface of the temporomandibular joint.
