扫描电镜观察漂白剂对牙釉质和牙本质结构的影响

目的：观察不同浓度漂白剂治疗牙釉质，牙本质后超策结构的变化，方法：分别用30％过氧化氢（1）组，16％过氧化脲（3）组对离体牙牙釉 质及牙本质进行6d治疗，SEM下观察，结果：（1）组牙釉质脱矿明显，牙本质因脱矿见有胶原纤维网架显露。（2＿组釉质因脱矿晶体微细结构不清晰，牙本质内见有局灶性钙化减低灶。（3）组釉柱排列整齐无脱矿，牙本质内有局灶性钙化减低区，结论：高浓度过氧化氢可龠上釉质及牙本质表层脱矿部分结构遭到破坏，提示临床应用低浓度漂白剂安全，有效。

Scanning electron microscope study on the effect of bleaching agents on the morphology of human enamel and dentin

Objective:To the ultrastructure changes of the morphology of enamel and dentin teeth after treated with different concentration of bleaching agents.Methods: Teeth were just extracted and then treated with 30% hydrogen peroxide(1)group, 16% carbamide peroxide(2)grpup,and 11% carbamide peroxide(3)group respectively for six days.The morphology of enamel and dentin of each tooth were evaluated undera scanning electron microscope.Results:(1)group,Some enamel crystals had obvious demineralization.Collagenfiber was exposured due to dentin dmineralization.In(2)group port of the texture of enamel crystals were not distinct due to demineralization.Foci of decalcification of dentin was found in SEM.In(3) group,enarnel rods were regular arranged and high mineralization dentin had scattered foci of decalcification.Conclusion:The high concentration of bleaching agents demineralized enamel and dentin and some texture of them were destroyed.The result showed the lower concentration of bleaching agents is a safe and effective agent for clinical application.