华西口腔医学杂志

• 临床研究 • 上一篇    下一篇

全托儿童口腔变形链球菌水平传播的初步研究

邹 静1,尚 冉2,凌均1,周学东3   

  1. 1.中山大学光华口腔医学院,广东 广州510055; 2.四川大学华西口腔医院 儿童口腔科;3.牙体牙髓病科,四川 成都610041
  • 收稿日期:2005-10-25 修回日期:2005-10-25 出版日期:2005-10-20 发布日期:2005-10-20
  • 通讯作者: 尚 冉, Tel: 028-66886064
  • 作者简介:邹 静(1970-),女,四川人,副教授,博士
  • 基金资助:
    中国博士后科学基金资助项目(2005037617)

Study on the Horizontal Transmission of OralStreptococcus mutansin Children

ZOUJing1,SHANG Ran2,LING Jun-qi1,ZHOUXue-dong3   

  1. 1.Guanghua College ofStomatology,Zhongshan University,Guangzhou510055,China; 2.Dept.of Pediatric Dentistry,West China College ofStomatology,Sichuan University,Chengdu610041,China; 3.Dept.ofEndodon- tics,West China College ofStomatology,Sichuan University,Chengdu610041,China
  • Received:2005-10-25 Revised:2005-10-25 Online:2005-10-20 Published:2005-10-20

摘要: 目的 通过对幼儿园全托儿童之间口腔变形链球菌水平传播的研究,为儿童龋病预防提供新的思路。方 法 选择24名3~4岁全托儿童为研究对象,其中无龋组和有龋组各12名。采用无菌牙签采集牙面菌斑,厌氧培 养48 h,根据变形链球菌的典型形态挑取单个菌落进行次代纯培养,经形态学和微量生化鉴定后将分离的菌株行 AP-PCR扩增,对来自不同个体基因型相似的菌株再进行DNA指纹分析。结果 24名受检儿童中,变形链球菌检出 率为66·7%,无龋组和有龋组检出率分别为58·3%和75·0%。经AP-PCR扩增,24名儿童口腔中检测出29个不同 基因型的变形链球菌,其中携带2个以上基因型儿童占45·8%。经DNA指纹分析,有2种基因型在11名全托儿童 口腔中有重复检出。结论 变形链球菌在全托儿童口腔中可能存在水平传播。

关键词: 变形链球菌, 基因型, 随机引物聚合酶链反应法, DNA指纹分析

Abstract: Objective To find out horizontal transmission of oralStreptococcus mutans(S.mutans) in nursery children through analyzing the similarity ofS.mutansgenotypes.Methods The study group included 24 nursery children between 3 and 4 years of age. Dental plaque sampleswere collectedwith sterile toothpick and cultured onMSB plates for48 h. IndividualStreptococcus mu- tansgroup colonies representative of the colonial morphologies were subcultured on TPY plates. These strains were identified to species level biochemically. AP-PCR fingerprinting was preformed after identification.S.mutansisolates from different children with very similar fingerprinting profiles were examined by chromosomal DNA fingerprinting analysis.Results Streptococcus mu- tansgroup were isolated in oral cavities of 66.7% children, 58.3% in caries-free and 75.0% in caries children. A total of 46 S.mutansisolates from 24 subjects were analyzed by AP-PCR, and 29 different amplitypes were identifyied, 45.8% carried two genotypes. There were 2 genotypes ofS.mutansisolated repeatedly among 12 nursery children.Conclusion The presence of matching genotypes ofS.mutansamong nursery children suggests horizontal transmission.

Key words: Streptococcus mutans, genotype, arbitrarily primed polymerase chain reaction, DNA fingerprinting