【摘要】 目的比较高龋和无龋幼儿菌斑致龋菌的检出率,分析不同致龋菌检出情况与dmft的关系。方法调查818名广州城、郊3~4岁儿童患龋情况,根据结果抽取3~4岁高龋和无龋儿童各40名,采集乳磨牙颊面菌斑,用选择性培养基进行分离培养,采用形态学和生化实验的方法进行细菌鉴定。结果高龋组幼儿变形链球菌、远缘链球菌和乳杆菌的检出率分别是95.0%、32.5%和45.0%,均显著高于无龋组儿童三种细菌的检出率(P<0.05)。高龋组儿童中,同时检出三种致龋菌的儿童的dmft为13.22±3.49,显著高于只检出一种或两种致龋菌的儿童(P<0.05)。结论高龋儿童变形链球菌、远缘链球菌和乳杆菌检出率高于无龋儿童,菌斑致龋菌的种类越多,造成儿童口腔中具有更多龋齿的危险性也更大。更多还原

【Abstract】 Objective To compare the differences of cariogenic bacterium in dental plaque of children with high dmft and no caries and to analyze their relationship with dmft level.Methods dmft of 818 children aged 3～4 years from urban and suburban areas of Guangzhou city were recorded. Forty children with highest dmft score or caries free were selected randomly and respectively. Plaque samples were collected from buccal surface of the molar and plated onto selective media. S. mutans, S.sobrinus and lactobacilli were identified by their forms and the results of biochemical tests.Results Ninety percent of the children with high dmft carried S.mutans, while 32.5% and 45.0% of the children with high dmft carried S.sobrinus and lactobacilli respectively, all significantly higher than in corresponding control groups. The mean dmft of the children carried the three kinds of cariogenic bacterium were 13.22±3.49, higher than those carried the only one or two kinds of cariogenic bacterium.Conclusion Children carried S. mutans, S.sobrinus and lactobacilli may have higher risk to have caries teeth.更多还原