菌斑指数（plaque index，PLI）由Silness和Loe在1963年提出，根据牙面菌斑的厚度记分而不根据菌斑覆盖面积记分。用于评价口腔卫生状况和衡量牙周病防治效果。
(3)口腔卫生指数：采用菌斑指数(plaque index,pi):采用品红溶液,在患者清水漱口后,小棉球蘸取药液,涂试在牙齿龈沿及根面，根据根面是否有菌斑显示记录口腔卫生情况。
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Results:48% suspected caries in young permanent teeth turned into caries within one year. The most significant risk factors were(strong to weak):Dmft,plaque index and frequency of sweet consumption.
结果:年轻恒磨牙的着色窝沟中1年内共48%转变为龋,有显著影响的危险性指标由强到弱分别是:dmft,患牙菌斑指数,甜食频率。
参考来源 - 应用DIAGNOdent激光荧光龋诊断仪对年轻恒牙着色窝沟的纵向观察·2,447,543篇论文数据，部分数据来源于NoteExpress
观察用乳膏前后临床症状和菌斑指数、牙龈指数、龈沟出血指数的变化。
The changes of clinical sign, plaque index, gingival index and sulcus bleeding index were observed before and after using yahao.
结果实验组的菌斑指数和牙龈指数均有明显下降，治疗牙龈炎有效率较安慰剂组高。
Results The plaque index and gingival index of experiment group had decreased obviously, which effective rate in treatment of gingivitis was higher than that of placebo group.
治疗前后检查患者的牙龈指数(GI)，菌斑指数(PLI)和龈沟出血指数(SBI)。
Gingival index (gi), plaque index (PLI) and sulcus bleeding index (SBI) were measured before and after treatment.
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