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发生开(牙合)的原因很多,如罹患佝偻病,不正确的人工喂养,牙齿未按时萌出,治疗和拔牙不及时,不良习惯的作用等等。遗传因素是很值得注意的问题,确定开(牙合)遗传的类型,决定遗传作用的程度、畸形重现的危险因素等,进行医学遗传学咨询,有利于进行早期预防和治疗。作者研究开(牙合)的群体发生率,检查小儿和大、中学生共2139人,年龄3～27岁,女性1137,男性1002。为分析开(牙合)的遗传性,研究30例开(牙合)畸形亲属(父母、兄弟、姐妹)的(牙合)型,进行仔细的专科检查,研究诊断模型,详细登记调查表。研究结果和讨论群体开(牙合)发生率,3～5岁小
Occurrence of open occlusion (occlusion) for many reasons, such as suffering from rickets, improper artificial feeding, the eruption of teeth is not on time, treatment and extraction is not timely, the role of bad habits and so on. Genetic factors are very noteworthy issues, to determine the type of open occlusion, determine the extent of genetic effects, the risk of deformity recurrence, medical genetics counseling, is conducive to early prevention and treatment. The authors studied the prevalence of open occlusion in a population of 2139 children aged 3-27 years, 1137 females and 1002 males. In order to analyze the genetics of open occlusion, the occlusion of 30 open occlusion relatives (parents, siblings and sisters) was studied. Careful specialist examination, study of diagnostic models and registration of questionnaires were conducted. Results and Discussion Group open (occlusion) incidence, 3 to 5 years old