1.牙菌斑是如何致龋的? 目前认为:牙菌斑及其组成微生物是引起龋病的主要因素。微生物一旦在牙齿表面聚集而形成菌斑,就会在宿主摄入的各种可酵解碳水化合物存在的情况下大量生长。微生物的代谢产物包括各种羧酸(即乳酸、丙酮酸)。这种酸在菌斑内,尤其是在紧密相邻两牙的深层菌斑中存在,在釉质与菌斑界面处的菌斑pH下降至釉质的临界pH(5.3～ 1. How plaque is caries? It is currently believed that: plaque and its constituent microorganisms are the main factors that cause caries. Once the microorganisms gather on the tooth surface to form plaque, they grow in large quantities in the presence of various digestible carbohydrates ingested by the host. Metabolites of microorganisms include various carboxylic acids (ie, lactic acid, pyruvic acid). This acid is present in plaque, especially in deep plaque of closely adjacent two teeth. The plaque pH at the enamel to plaque interface drops to the critical pH of enamel (5.3 ~