抄録
The trismus caused by the bilateral coronoid hyperplasia is described in this report. In April 1993, a 5-year-old boy visited our clinic with a chief complaint of the trismus. He was diagnosed as the TMJ-disorder suspected from clinical symptoms and pantomography at the first visit. Jaw opening exercise was applied during the period of 12 months from the point of view of patient's psychological and physiological development. His condition, however, did not improve. Tomography and CT scanning were taken to examine in more detail. From these findings, the final diagnosis of the coronoid process hyperplasia was established.
