The pit and fissure sealant have significant preventive effect on carious teeth.
窝沟封闭能有效预防窝沟龋的发生。
Conclusion: the pit and fissure sealant have significant preventive effect on carious teeth.
结论：窝沟封闭能有效预防窝沟龋的发生。
Because this study choosed the children who had at least two carious teeth at the same time that avoided bias on different oral circumstance, different oral habit, and different dietetic habit.
分析认为，本实验选择的对象是一人有两颗以上龋齿的儿童，这就避免了不同口腔环境、口腔习惯和饮食习惯造成的偏倚。
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