冠部牙本质深龋细菌学分析

An analysis of bacteriology on dentin caries of crown

目的：探明牙本质深龋中的主要相关菌。方法：利用色谱法、裂解法等对龋坏牙本质分三层作细菌分离、鉴定、分析。结果：牙本质龋中的主要相关菌为乳杆菌和变链菌，龋内层牙本质中的细菌含量较外层少。结论：乳杆菌促进牙本质龋的发展，在牙本质龋进展中脱矿在先，细菌入侵在后。

Objective: To determine the cariogenic bacteria in deep dentinal caries. Method: The bacteria in outer and inner layer of carious dentin and pulp were isolated,identificated and analysed with chromatography and pyrolysis. Result: Lactobacillus and streptococcus mutans were found to be the main bacteria in the carious dentin.There were more bacteria in the outer layer than in the inner layer. Conclusion: Lactobacillus may promote the progress of dentinal caries,during the progression of dentin demineralization,then invasion of bacteria follows.