牙颌畸形是指儿童在生长发育过程中,由于先天的遗传因素和后天的环境因素,如疾病、营养不良、功能障碍、口腔不良习惯,替牙异常等导致牙齿、颌骨、颅面的畸形,如牙齿排列不齐、拥挤、牙间隙、先天缺失牙、多生牙、牙齿和颌骨的形态大小位置异常,上下牙弓间的咬合异常。牙颌畸形影响儿童颅面部的发育,影响儿 Deformity of the jaw refers to the deformity of the teeth, jawbone and craniofacial area caused by the congenital genetic factors and the acquired environmental factors such as diseases, malnutrition, dysfunction, bad oral habits and abnormal teeth during the growth and development of children , Such as missing teeth arranged, crowded, interdental space, congenital missing teeth, multiple teeth, teeth and jaw shape and size of abnormal position, the upper and lower occlusion between the dental arch. Dental malformation affect the development of children's craniofacial area, affecting children