不同根充材料对于根尖横剖面封闭性能的效果评价

目的:评价3种根管充填材料在不同断面的根管密封性能,分析其影响因素。方法:收集新鲜拔除的完整单根管下颌第一前磨牙60颗,随即分为A、B、C 3组,每组20颗牙,分别用氧化锌丁香油糊剂、Vitapex糊剂、AH-Plus糊剂加牙胶尖以侧压法进行根管充填。然后在距根尖狭窄2,4,6,8mm处垂直于牙体长轴切开牙体,扫描电镜观察不同材料与根管壁之间的结合状态并测量根管壁与根管糊剂间微缝隙宽度。结果:扫描电镜下不同根管封闭剂与根管壁均观察到空隙存在,但AH-Plus组可见材料呈均质状分布,与管壁粘结最为紧密。在距根尖2mm处AH-Plus组的微缝隙宽度(2.25±7.63)μm明显低于氧化锌丁香油糊剂(9.56±3.12)μm和Vitapex糊剂(8.81±1.55)μm(P<0.05);在距根尖4,6,8mm处,AH-Plus组与氧化锌丁香油组、Vitapex组的微缝隙宽度无显著差异(P>0.05)。结论:AH-Plus糊剂对于根管充填特别是根尖有很好的密合性,能有效防止根尖微渗漏现象的发生。

Effect Assessment on Apical Sealing Ability of Three Kinds of Root Canal Filling Materials Based on Cross Profile

Objective:To estimate the blocking efficacy of 3kinds of root canal filling materials at various section and to analyze the influence factors.Methods:Sixty freshly extracted mandibular first premolar with single root were collected.The samples were randomly divided into A,B,and C groups,with 20teeth in each group.The teeth in A,B,and C groups were respectively filled with gutta-percha point of the same kind plus Zinc Oxide-eugenol(ZOE)paste,Vitapex paste and AH-Plus paste in lateral pressure way.Then roots were sectioned at 2,4,6,and 8mm levels respectively from apical foramen.The binding state between filling materials and the root canal wall and their micro-chink were measured under scanning electron microscope(SEM). Results:Under SEM,gaps between different filling materials and root canal wall were all observed,but the binding state of AH-Plus paste group was obviously better than that of the other two groups.At the 2mm level from apex,the micro-chink of AH-Plus paste group([2.25± 7.63]μm)was significantly lower than that of ZOE paste group([9.56±3.12]μm)and that of Vitapex paste group([8.81±1.55]μm)(P<0.05).At the 4,6and 8mm levels,there were no significant differences in micro-chink among these three groups(P>0.05).Conclusion:AH-Plus paste,used as root canal filling material,showed better sealing ability,and it could effectively prevent the occurrence of apical microleakage.