比较了使用压缩空气与使用洗耳球热空气干燥牙面对封闭剂脱落率的影响。结果表明：压缩空气干燥牙面较洗耳球热空气干燥牙面，封闭剂完全脱落率低；上颌磨牙远中腭沟、近中沟，差异有高度显著性（Ｐ＜０．０１），下颌磨牙面差异无显著性（Ｐ＜０．０５）。说明使用压缩空气干燥牙面有利于封闭剂的保留，特别对于不易操作的上颌磨牙影响更加明显，而对于能直视、易操作的下颌磨牙，使用洗耳球热空气干燥牙面也能达到较好的效果 The effects of using compressed air and hot air for earwax drying on the tooth absopment rate were compared. The results showed that compressed air dried tooth surface was drier than hot air ball, and the rate of sealant completely disappeared. There was a significant difference in maxillary molars between mesial palate groove and mesial groove (P <0.01) There was no significant difference in molars (P <0.05). It shows that the use of compressed air to dry the tooth surface is favorable for the retention of the sealant, especially for the maxillary molars which are not easy to operate. For the mandibular molar which can be directly looked and easy to operate, Good results