Effect Of Fluoride Foam And Chlorhexidine Rinse On Streptococcus Mutans In Dental Plaque Of Aged 12 Children

Objective:To evaluate the effect of fluoride foam and chlorhexidine rinse on Streptococcus mutans in dental plaque of children and the variation of bacterial levels of MS in different times.To find better prevention of dental caries provide experimental basis for the clinicalMethods:Eighty children were divided into A and B groups.Every group was divided into caries-free(DMFT=0) and caries(DMFT＞0).A group was applicated 1.23%fluoride foam and B group was applicated 0.2%chlorhexidine rinse. Bacterial levels of streptococcus mutans were evaluated in dental plaque samples in vitro 1,24h and 1 week compared the difference with pretreatment in A group,while that were evaluated in vitro pretreatment and lweek in B group.Plaque sample from buccal surface of the right maxillary first molar were inoculated into salivarious agar(MSA) for germiculture and colony count.Streptococcus mutans were applied for morphology and biochemistry assessment.Statistical analyses were carried out with the SPSS software,the level of significance was set to P＜0.05.Results:1.Bacterial levels of streptococcus mutans were lowed significantly than pretreatment after using fluoride foam 1h and 24 h and 1 week(p＜0.05).2.Bacterial levels of streptococcus mutans were decreased significantly as well after one week compared with pretreatment in chlorhexidine rinse(p＜0.05). 3.In caries-free and caries of B group,the 57.94%and 52.91%reduction in bacterial levels of streptococcus mutans after one week was more than the 31.86%and 33.77% reduction in A group.Conclusion:Fluoride foam and chlorhexidine rinse can decrease S.mutans levels in dental plaque of children and might be useful in preventing caries lesions.The effect of bacteriostasis in the group of chlorhexidine rinse were more stronger than that in the group of fluoride foam..