体外模型中3种光固化树脂充填体边缘微渗漏实验研究

目的：比较3种光固化充填材料在体外模型中充填体边缘的微渗漏程度。方法：在36颗离体的前磨牙颊侧颈部备洞。随机分为3组,每组12颗牙。分别充填3M前后牙通用树脂Valux Plus、流动性纳米复合树脂Z350、登士柏Esthet.XTM复合树脂。样本经温度循环,采用10g/L碱性品红染色后,颊舌向沿长轴连续切开,在体式显微镜下观察修复体与牙体洞壁间染料渗漏情况。结果：3种材料中流动性纳米复合树脂Z350微渗漏最小。前后牙通用树脂Valux Plus微渗漏最大。流动性纳米复合树脂Z350与其他两组相比有显著性差异（P〈0.01）。结论：流动性纳米复合树脂Z350是临床上充填颊侧颈部窝洞的较好材料。

Experiment on Gingival Marginal Microleakage of Three Kinds of Composite Restorations in Artificial Model

Objective：To evaluate the degree of marginal microleakage of three kinds of composites in vitro model.Methods：Thirty-six premolars neck cavities were randomly assigned to 3 experimerimental groups in vitro,12 of each.Class V cavities were prepared on labial side of each tooth.Composite Valur Plus,liquid nanocomposite resin Z350 and resin composite Esthet XTM were used respectively to each group,with twelve cavities for every kind of composite.After thermal cycling（x600,4-60℃）,the teeth were immersed in 1% basic fuchsin dye for 24hours at room temperature.All teeth were cut labial-lingual direction and the penetration of dye along the wall of cavities were observed under stereoscopic microscope.Results：Restorative nanoleucite composite resins Z350 is a lesser microleakage material.Significant differences were observed between nanoleucite composite resins Z350 and other two materials（P0.01）.No statistically significant differences in microleakage were noted between other two groups.Conclusion：Liquid nanocomposite resin Z350 is a better clinical material for filling the buccal neck carity.