长期以来口腔正畸学的重点一直集中于替牙牙合期和恒牙牙合期，有关乳牙牙合错牙合畸形的研究报道甚少，而有关乳牙牙合错牙合畸形的流行病学研究则更为鲜见。另一方面，由于社会经济水平的发展，儿童乳牙牙合的错牙合畸形日益受到有关方面的重视，并且这一时期的儿童正处... For a long time orthodontics has been focused on the period of occlusal occlusion and permanent occlusion. There are few reports on the occlusion of deciduous occlusion of deciduous teeth. However, the epidemiological study on occlusal malocclusion More rare. On the other hand, due to the development of social economy, the malocclusion of children with occlusal malocclusion is paid more and more attention by the relevant parties, and the children in this period are in the ...