乳牙化学去龋法的细菌学研究

目的：比较化学去龋法和机械去龋法清除细菌的效果。方法：选取40个龋坏深至牙本质的乳磨牙，中龋或深龋，随机分为化学法去龋组和机械法去龋组，每组20个牙，去龋前后使用无菌挖匙对龋坏牙本质进行取样，分别在4种不同的培养基上进行厌氧培养和计数。结果：两种方法去龋后，除机械法去龋组放线菌外，两种方法其他细菌数显著减少，有统计学意义（P〈0．05），化学法去龋组比机械法去龋组的总菌数量减少更显著（p〈0．05）。结论：化学去龋法比机械去龋法清除乳牙龋坏细菌效果好。

The bacteriological study of primary teeth of chemo-mechnical caries removal

Objective:To compare the efficacy of chemo-mechanical caries removal with conventional excavation in reducing the count of the cariogenic flora.Method:40 carious deciduous molar teeth were collected and randomly divided into two groups,i.e.,conventional drilling group(by bur) and Carisolv group.There were twenty teeth in each group.Samples from carious dentine were taken with a sterile scraping instrument.All softened dentine was removed and after second sample was taken.All samples were serially diluted and cultivated on four different nutrient agar plates,and counted.Result:Both methods produced a statistically significant reduction in bacterial counts after carie s removal,except actinomyces in conventional drilling group.There was significant decrease of the total bacteria in Carisolv group than conventional drilling group(by bur) (P<0.01).Conclusion:The Carisolv chemo-mechanical method is relatively more effective than conventional methods.