唇腭裂的发生率约为1/1500～1/600,这些先天畸形常常是复合发生,不仅有软硬组织的畸形,且常伴有错(牙合)畸形的存在。外科手术虽然能改善其外形,闭合裂隙,但不能阻止错(牙合)的发展。较好的手术方法也不可避免地加重牙(牙合)畸形的发展,因为瘢痕的收缩也直接影响到上腭的长、宽、高的发育和上唇外形。据北京医科 The incidence of cleft lip and palate is about 1/1500 ~ 1/600, these congenital malformations are often complex, not only the deformity of soft and hard tissue, and often accompanied by the existence of wrong (occlusion) deformity. Although surgery can improve its shape, closing the fissure, but can not stop the development of wrong occlusion. Better surgical methods also inevitably increase the development of dental occlusion, because the contraction of the scar has a direct impact on the palate's long, wide, high development and upper lip shape. According to Beijing Medical