Rølling S
Scand J Dent Res. 1980 Oct;88(5):365-9. doi: 10.1111/j.1600-0722.1980.tb01240.x.
Hypodontia, congenitally missing teeth, is one of the conditions recorded during systematic orthodontic screening of groups of children attending a community child dental health service. The present investigation reports the prevalence of hypodontia in 3325 9--10-year-old children in the 3rd schoolgrade examined with an orthopantomographic radiograph. The prevalence of children with hypodontia was found to be 7.8%. Fifty percent of these children were missing only one tooth while 8% were missing either one or two teeth. More teeth were missing in the mandible than in the maxilla. The teeth most frequently missing were the second premolars, representing 67% of the congenitally missing teeth. Symmetrical hypodontia of second premolars occurred approximately twice as often in girls as in boys. Though more teeth were congenitally missing in girls than in boys, no difference could be seen in the prevalence of hypodontia in boys (7.7%) and girls (7.8%).
缺牙症，即先天性牙齿缺失，是在社区儿童牙科保健服务机构对儿童群体进行系统性正畸筛查时记录的病症之一。本调查报道了对3325名九年级9至10岁儿童进行口腔全景X线片检查后缺牙症的患病率。发现患缺牙症儿童的患病率为7.8%。其中50%的儿童仅缺一颗牙，而8%的儿童缺一颗或两颗牙。下颌缺失的牙齿比上颌多。最常缺失的牙齿是第二前磨牙，占先天性缺失牙齿的67%。女孩第二前磨牙对称性缺牙的发生率约为男孩的两倍。虽然女孩先天性缺失的牙齿比男孩多，但男孩（7.7%）和女孩（7.8%）的缺牙症患病率没有差异。
