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为探讨天然植物银杏叶的提取物对临床分离的致龋变形链球菌的体外抗菌作用，随机选取ｄｍｆｔ≥３的成人３０名，取牙菌斑接种于培养基中，３７℃厌氧培养筛选传代３次，此外选取一株标准菌株作为质控菌株。每株均在６个不同的药物浓度下进行抑菌实验，观察最小抑菌浓度（ＭＩＣ）。结果表明，银杏叶的提取物对临床分离的致龋变形链球菌最小抑菌浓度为６２．５％ｇ／Ｌ。认为这在天然植物提取物中，对临床致龋变形链球菌的有较好的抗菌作用。
To investigate the in vitro antibacterial effect of natural plant extracts of Ginkgo biloba extract on clinical isolates of Streptococcus mutans, 30 adults with dmft ≥ 3 were randomly selected and inoculated into the culture medium. The samples were passaged at 37°C for anaerobic culture. Three times, a standard strain was selected as a quality control strain. Each strain was subjected to bacteriostasis at 6 different drug concentrations and the minimum inhibitory concentration (MIC) was observed. The results showed that the minimum inhibitory concentration of Ginkgo biloba extract against clinically isolated Streptococcus mutans was 62.5% g/L. It is considered that in natural plant extracts, it has a better antibacterial effect on clinically induced Streptococcus mutans.