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参考文献（略）牙周组织疾病是人类发病率较高的口腔疾患之一，在一汽厂区，已取代龋病成为拔牙的主要原因，现对一汽厂区1300名50岁以上职工及家属的牙周疾病情况进行了调查分析，现报道如下。1材料和方法①对象和方法对一汽厂区职工及家属抽取50岁以上1300人，除外163名全口
References (omitted) Periodontal tissue disease is one of the oral diseases with high incidence of human disease. In the FAW plant area, it has replaced rickets as the main reason for tooth extraction. Now it is on the periodontal of 1,300 employees and their relatives over 50 years old in the FAW factory area. Diseases were investigated and analyzed. The report is as follows. 1Materials and methods 1 Objects and methods 1300 employees aged 50 years or older are collected from FAW factory employees and their families, except 163 full mouths