目的:本研究的目的是用四种不同的文件系统来制备和封闭上颌第一磨牙近中颊根的弯曲管,旋转锥度(RP)文件,heroshaper手文件,和旋转英雄整形器文件,并通过锥形束计算机断层扫描(CBCT)评估其单锥形Gutta-percha的适应性。
方法:选择80颗牙齿,分为两组(G1A1,G1A2和G2A1,G2A2作为手和RP文件系统,G1A3,G1A4和G2A3,G2A4作为手动和旋转英雄整形机文件系统)每个第四齿。进入开口后,建立了中颊管的工作长度。使用分叉水平的金刚石圆盘去除样品的远颊和腭根。使用“Endoanalyser”软件在术前X光片上测量施耐德角度。这个角度是通过画两条线来测量的,一条线平行于运河的长轴,在第三日冕,和根尖孔的第二条线与第一条线离开运河长轴的点相交。然后根据制造商的说明书准备每组的运河,RP文件,heroshaper手文件,和旋转英雄塑造者文件系统。获得所有样品的直接数字射线照相图像。然后,将样本暴露于CBCT以评估其单锥适应性.使用SPSS20、IBM、Armonk,NY,美利坚合众国。
结果:拒绝了零假设,即在适应不同文件系统的单锥时不会有任何间隙区域。在旋转英雄塑形器文件系统(0.001mm2)中看到了最小的间隙面积,而在手工(HP)文件系统(0.015mm2)中看到了最大的间隙面积。
结论:CBCT是检测弯曲管闭塞后间隙区域的有用工具。HP单锥适应显示最大间隙面积,旋转囊钳单锥适应显示最小间隙面积。
OBJECTIVE: The aim of this study is to prepare and obturate the curved
canals of the mesiobuccal root of maxillary first molar with four different file systems that is protaper hand files, rotary pro taper (RP) files, heroshaper hand files, and rotary hero shapers files and to evaluate the adaptation of their single-cone Gutta-percha by cone beam computed tomography (CBCT).
METHODS: Eighty teeth were selected and were divided into two groups (G1A1, G1A2 and G2A1, G2A2 as hand and RP file system, G1A3, G1A4 and G2A3, G2A4 as hand and rotary hero shaper files system) of fourth teeth each. After access opening working length of the mesiobuccal canal was established. The distobuccal and palatal roots of the samples were removed using the diamond disc at the furcation level. \"Endoanalyser\" software was used to measure Schneider\'s angle on the preoperative radiograph. This angle was measured by drawing two lines-one parallel to the long axis of the canal, in the coronal third, and the second line from the apical foramen to intersect the point where the first line left the long axis of the canal. The
canals of each group were then prepared according to the manufacturer\'s instructions for protaper hand files, RP files, heroshaper hand files, and rotary hero shapers files systems. Direct digital radiography image of all the samples was obtained. And then, the samples were exposed to CBCT to evaluate their single-cone adaptations. The data were analyzed using SPSS 20, IBM, Armonk, NY, United States of America.
RESULTS: The null hypothesis that there will not be any gap area in the adaptation of their single-cone of different file system was rejected. Minimal gap area was seen in rotary hero shapers file system (0.001 mm2) and was maximum in hand protaper (HP) file system (0.015 mm2).
CONCLUSIONS: CBCT is a useful tool in detecting the gap area after obturation in curved
canals. The HP single-cone adaptation showed the maximum gap area and rotary heroshaper single-cone adaptation showed the minimum gap area.