[The electromandibular kinesiograph in cleft lip and palate with crossbite]

Through the comparative study of 29 unilateral cleft lip and palate patients with crossbite and 29 crossbite patients with MKG we find some features of tracks in the cleft patients as follows: (1) The protrusive distance was larger and the track became less steep; (2) Occlusal interference occurred frequently, the incidence was about 65.5%; (3) The interocclusal rest space was larger; (4) 93.1% of the patients was unilateral mastication, 82.7% of them used the health side. The masticatory tracks were not concentrative and the range of lateral movements in mastication was small; (5) 75.86% of the patients presents one or two kinds of TMJDS symptoms, it should not be overlooked.