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根据有关卫生部门对部分幼儿园大班幼儿及小学生的跟踪调查发现,牙颌畸形在儿童中的患病率大约为20～30%,而牙列不齐者可占40～60%。前者的病因一般是遗传所致,而牙列不齐的病因大多由不良习惯、乳牙早失、乳牙滞留及佝偻病、唇腭裂等所致。牙颌畸形及牙列不齐的防治应从婴儿期做起。母亲在哺乳时,应使乳儿下颌有适宜的前伸运动;人工哺乳时应注意奶瓶的位置,若奶瓶过分压迫下颌,可造成下颌后缩而
According to the follow-up survey conducted by the health department on some kindergarten pupils and pupils in some kindergartens, the prevalence of dento-maxillofacial deformities in children is about 20% to 30%, while that of dentition-deficient persons can account for 40% to 60%. The former cause is generally caused by genetic, and the cause of malformations are mostly caused by bad habits, early loss of deciduous teeth, deciduous teeth retention and rickets, cleft lip and palate. Dentures and dentition malformations should be prevention and treatment from infancy. Mother breast-feeding, the baby should be suitable for the lower jaw forward movement; artificial breast-feeding should pay attention to the location of the bottle, if excessive compression of the lower jaw, jaw can cause the contraction