1989 Volume 38 Issue 4 Pages 1037-1042
Incoordination is a disk movement anomaly in the temporomandibular joint (TMJ) in which the condyle is displaced anterior to the anterior band of the disk at maximum opening and difficulty in closing mouth occurs clinically. This disorder has been previously reported in only 9 cases.
Recently we encountered a case of incoordination in a 43-yaer-old woman. The chef complaint was difficulty in mouth opening and closing. The clinical symptoms observed were intermediate clicking in her left TMJ and overbite.
Conventional radiographic findings of bilateral TMJs showed few changes in hard tissue, therefore, osteoarthrosis was denied.
We thought that the cause of difficulty in mouth opening and closing existed in the soft tissue of the left TMJ, and therefore performed double contrast arthrotomography in the left one. Double contrast arthrotomograms showed anterior disk displacement at hibitual occlusal position and reduction of the disk at 30 mm of opening. Furthermore, the condyle was displaced anterior to the anterior band of the disk at maximum opening (incisal edge clearance is 39 mm). Internal derangement with incoordination in the left TMJ was diagnosed on the double contrast arthrotomography.
