牙颌畸形的发病率相当高,国内统计为29.33～48.87％(与各地检查标准不一有关)。在儿童生长发育过程中,由于遗传、疾病、内分泌障碍、营养不良、不良习惯及替牙障碍等因素的影响,导致牙齿排列不齐,上下牙弓(牙合)关系错乱,上下颌骨的位置与大小失调,而形成各种错(牙合)及颌面部发育 The incidence of dental malformations is very high, the domestic statistics for 29.33 ~ 48.87% (with different inspection standards around). In the process of children's growth and development, due to genetic, disease, endocrine disorders, malnutrition, bad habits and the impact of tooth replacement disorders and other factors, resulting in missing teeth, the upper and lower dental arch occlusion relationship, the location of the upper and lower jaw And the size of disorders, and the formation of a variety of wrong (occlusion) and maxillofacial development