iRoot用于根尖倒充填封闭性的体外研究

目的 通过体外试验检测iRoot作为根尖倒充填材料的封闭性,并与矿物三氧化聚合体(MTA)进行比较,旨在为临床应用iRoot提供参考依据.方法 将67颗单根管前牙截去牙冠,进行常规根管预备及充填,切除根尖3 mm,行根尖倒预备.将样本中63颗牙分为4个试验组,分别用不同材料进行根尖倒充填:A组(iRoot BP)、B组(iRoot BP plus)、C组(MTA)各为17颗牙,D组(iRoot BP+牙胶尖)12颗牙,剩余4颗牙作为对照组.4个试验组中每组选取10颗牙用流体动力学检测微渗漏,观察1、7、14、28d4个时间点的微渗漏情况,另外各组选取2颗牙用SEM观察充填材料超微结构.A、B、C3组各余下5颗牙用MicroCT扫描,检测充填材料的孔隙率.结果 SEM观察发现,A、B、D组各样本中充填材料与牙本质界面间未见明显的边缘间隙,而C组各样本中可见较为明显的间隙.Micro CT扫描结果发现,A、B、C3组间的孔隙率分别为0.020士0.023、0.045=±=0.035、0.031±0.011,组间两两比较差异无统计学意义(P＞0.05).流体动力学试验表明,4组间的微渗漏测定值比较,差异无统计学意义(P＞0.05).结论 iRoot和MTA两种材料用于根尖倒充填的封闭效果无明显差异,但iRoot操作性优于MTA.

Study on sealing ability of iRoot used as root end retrograde filling material

Objective To detect the sealing ability of iRoot as root end retrograde filling material in vitro experiment,and to compare it with mineral trioxide aggregate(MTA) in order to provide reference basis for clinical use of iRoot.Methods The dental crown was removed in 67 single root canal anterior teeth.The routine root canal preparation and filling were performed.The root end was resected by 3 mm for conducting root end retrograde preparation.Sixty-three teeth in the samples were randomly divided into 4 experimental groups.Then the different materials were used for root end filling:iRoot BP (group A,n=17),iRoot BP plus (group B,n=17),MTA (group C,n =17),and group D(iRoot BP + gutta percha,n =12),the residual 4 samples served as the control group.The apical microleakage of 10 teeth in each experimental group was detected by the fluid dynamics.The microleakage situation at the time points of 1,7,14,28 d was observed.In addition,2 teeth selected from each group were performed the filling material ultramicrostructure observation by SEM.Each 5 teeth were remained in the group A,B and C and performed the Micro CT scanning.The porosity rate of filling material was detected.Results No obvious edge gap was found between the filling materials and dentin surface in the group A,B and D by SEM,but obvious gap could be seen in various samples of group C.Micro CT scanning found that the porosity rates in the group A,B and C were 0.020 ±0.023,0.045 ±0.035 and 0.031 ± 0.011 respectively,but showing no statistical difference(P＞0.05).The fluid dynamic experiment showed that the microleakage detection value in each group had no statistical difference(P＞0.05).Conclusion The sealing ability of iRoot and MTA used in root end retrograde sealing has no obvious difference,But iRoot operability is superior to MTA.