扫描电镜下三种流动树脂充填体边缘微渗漏研究

摘要

Objective To evaluate the microleakage of three types of flowable nanocomposite resins in the restorations of Class V cavities under scanning electron microscope. Methods Forty - two premolars were randomly assigned to 3 experimental groups(14 in each group). Class V cavities were prepared on the labial - buccal side of each tooth. Liquid nanocomposite resin Z350,liquid polymer Beautifil Flow and liquid com-posite resins Esthet. X were used respectively to each group. After thermal cycling and load experiment,samples chosen randomly from each group were observed under the scanning electron microscope. Results Restorative nanocomposite resins Z350 had the least crevice width between obtu-rator and dental tissues among the three whilst the liquid composite resin Esthet. X had the greatest. Significant differences were observed between liquid nanocomposite resins Z350 and the two other materials(all P < 0. 01). Conclusion Liquid nanocomposite resin Z350 is a better clinical material for restoring cervical caries.%目的：扫描电镜下观察比较三种流动树脂充填 V 类洞的微渗漏程度。方法在42颗离体的恒磨牙颊侧制备 V 类洞，随机分为3组，每组14颗牙。分别充填 Filtek Z350流动性纳米复合树脂、Beautifil Flow 流动型聚合体和Esthet. X 流体复合树脂，样本经冷热循环及加压负载试验后，在扫描电镜下观察充填体龈壁边缘微渗漏情况。结果Z350流动性纳米复合树脂组充填体与牙体组织之间微缝隙宽度最窄，与 Beautifil Flow 流动型聚合体组、Esthet. X 流体复合树脂组相比均有显著性差异（ P ＜0.01）。结论 Z350流动性纳米复合树脂适合用于牙颈部龋损的充填。