老年根面龋的细菌学研究

目的 :通过对根面龋菌斑微生物的定量分析 ,进一步了解根面龋的致龋机制。方法 :选择 15例老年根龋患者 ,分别对其根面龋、冠龋、无龋根面的菌斑微生物中的变形链球菌、乳酸杆菌、放线菌进行菌落计数。结果 :变形链球菌在根龋和冠龋中的检出率高达 10 0 % ,占总链球菌 6 4 78± 2 2 36 %和 77 17± 14 2 6 % ,明显高于无龋根面 ;放线菌在根龋中的检出率明显高于冠龋。结论 :变形链球菌 ,放线菌是根面龋的优势菌。

A Bacteriological Study of Root Caries

Objective:To explore the major pathognic bacteria of root caries through quantitative analyses of the palque samples.Methods:15 elders with root caries were studied,the plaque samples of root and enamel caries and sound root surfaces were analysed quantitatively.Results:(1) The dectectable rate of S.mutans and their amount against total streptococci of root and enamel caries are significantly higher than the sound root surfaces (2)The detectable rate of Actinomyces of root caries is higher than enamel caries.Conclusion:Mutans and Actinomyces are major pathogenic factors of root caries.