氟化钠不同导入方法对牙本质通透性的影响

Effects of different methods of treating NaF on dentinal permeability in vitro.

目的:观察不同方法导入氟化钠对牙本质通透性的影响,为临床使用氟化钠甘油糊剂治疗牙本质敏感症选择方法提供参考。方法:收集30～50岁完整离体磨牙,除去牙釉质,暴露同样程度的牙本质,75%氟化钠甘油糊剂放置于牙本质表面,通过加热、涂擦、微波和激光等方法处理后,牙体标本置于2%亚甲兰溶液中浸泡6h,剖开,在显微镜下观察染料渗透的距离。结果:加热NaF和用激光、微波直接处理牙本质表面,其通透性较空白对照组明显增加(p<0.05),激光或微波作用氟化钠,牙本质通透性较空白对照组明显降低(p<0.05)。结论:激光或微波联合NaF治疗牙本质敏感症比单独用激光、微波治疗效果更好。

Objective： To observe effects of different methods treating NaF on dentine permeability in vitro. Method： Isolated intact teeth from 30-50 years old were collected and prepared to expose same degree of dentine . 75% NaF glycerine paste on dentinal surface were treated by heating , micro-wave, scribble and laser respectively in same time according to experimental design. Specimens were immersed in 2% liquid of methylene blue six hours and then observed and measured dye permeate distance under stero-microscope. Result：Increased permeability distance of heating NaF and laser or microwave only acting directly dentine surface more than scribble and laser or micro-wave acting with NaF in same conditions .Difference between two groups was significant difference. Conclusion： Permeability distance of heating NaF and laser or microwave acting directly dentine surface increased more than scribble and laser or micro-wave acting NaF on surface of dentine in our study.