90 patients of internal derangement of the TMJ were treated with anterior repositioning splint designed by the authors and were followed up for 8 years. Anterior disc displacement of the TMJ with reciprocal clicking can be successfully cured with the new type splint. The total successful therapeutic rate was 93. 3%. There was no recurrence of clicking when the splint was removed. The original intercus-pal position of mandible did not change and there was no need to make occlusal reconstruction for the patients.