氟对正畸儿童牙面菌斑变形链球菌的影响

The effect of fluoride on Streptococcus mutans in dental plaque of orthodontic patients

目的 :观察和探讨 2 %氟化钠对正畸患者牙面菌斑内细菌总数及变形链球菌数的影响。方法 :选择 34例正畸儿童 ,分为两组 ,试验组涂布 2 %氟化钠 ;对照组不做处理。分别于戴用矫治器前 ,戴入后 1月采集上颌牙唇颊面菌斑 ,测定菌斑中细菌总数及变形链球菌数。结果 :对照组戴用后 1月 ,细菌总数及变形链球菌数较戴用前明显增加 (P <0 0 1)。对照组与试验组戴用后 1月相比 ,试验组细菌总数及变形链球菌数明显少于对照组 (P <0 0 5 )。结论 :戴用固定矫治器后 ,牙面菌斑内细菌总数及变形链球菌数较戴用前增加 ,应用 2 %氟化钠可明显抑制正畸患者口腔内变形链球菌数 ,减少龋坏发生。

Objective:This study evaluated the effect of fluoride on Streptococcus mutans and total bacterial counts in dental plaque of orthodontic patients.Methods:34 orthodontic subjects were divided into two groups.The experimental group was applicated 2% NaF and control group wasn't applicated.Bacterial levels of Streptococcus mutans and total counts were evaluated in dental plaque samples before using fixed appliances and after one month,respectively.Results:After one month,bacterial levels of Streptococcus mutans and total counts of control group increased( P<0 01 ) Bacterial levels of Streptococcus mutans and total counts of experimental group decreased significantly after one month comparing with control group( P <0 05) Conclusion:Fluoride can decreases S mutans levels in orthodontic patients with fixed appliances and might be useful in preventing caries lesions