扫描电镜观察漂白剂对牙釉质和牙本质结构的影响  

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

作　　者：王春兰[1] 董亚利[2] 

机构地区：[1]天津医科大学第二医院,300211 [2]天津医科大学电镜室

出　　处：《现代口腔医学杂志》2001年第5期334-335,共2页Journal of Modern Stomatology

摘　　要：目的　观察不同浓度漂白剂治疗牙釉质、牙本质超微结构的变化。方法　分别用 30 %过氧化氢①组 ,16 %过氧化脲②组 ,11%过氧化脲③组对离体牙牙釉质及牙本质进行 6天治疗 ,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　高浓度过氧化氢可使牙釉质及牙本质表层脱矿部分结构遭到破坏 。Objective To observe the ultrastructure changes of the morphology of enamel and dentin after treated with different concentration of bleaching agents.Methods The fresh extracted teeth were treated with 30% hydrogenperoxide ①,16% carbamide peroxide ②,and 11% carbamide peroxide ③ respectively for six days.The morphology of enamel and dentin of each tooth was evaluated under a scanning electron microscope.Results In group ①,some enamel crystals had obvious demineralization.Collagenfiber was exposured due to dentin dmineralization.In group ②,part of the texture of enamel crystals was not distinct due to demineralization.Foci of decalcification of dentin were found in SEM.In group ③,enamel rods were regularly arranged and highly mineralized and dentin had scattered foci of decalcification.Conclusion The high concentration of bleaching agents demineralizes enamel and dentin,and some texture was destroyed.The lower concentration of bleaching agents is a safe and effective agent for clinical application.

关 键 词：过氧化氢 过氧化脲 超微结构脱矿 牙本质结构 

分 类 号：R780.2[医药卫生—口腔医学]