Ahluwalia Yuvika, Sharma Utsav, Kumar Neeraj, Malik Azhar, Singh Anshdeep, Narayan Amit
Reader, Institute of Dental Sciences and Technologies, Kadrabad, Modinagar Uttar Pardesh, Ghaziabad, India.
Senior Lecturer, Department of Conservative Dentistry and Endodontics, Seema Dental College and Hospital, Rishikesh, Uttarakhand, India.
J Int Soc Prev Community Dent. 2019 Mar-Apr;9(2):185-193. doi: 10.4103/jispcd.JISPCD_398_18. Epub 2019 Feb 27.
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).
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.
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 mm) and was maximum in hand protaper (HP) file system (0.015 mm).
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.
本研究旨在使用四种不同的锉系统（即Protaper手动锉、旋转Pro Taper（RP）锉、HeroShaper手动锉和旋转Hero Shaper锉）预备和充填上颌第一磨牙近中颊根的弯曲根管，并通过锥形束计算机断层扫描（CBCT）评估其单尖牙胶尖的适配性。
选取80颗牙齿，分为两组（G1A1、G1A2和G2A1、G2A2为手动锉和RP锉系统组，G1A3、G1A4和G2A3、G2A4为手动锉和旋转Hero Shaper锉系统组），每组各40颗牙齿。开髓后确定近中颊根管的工作长度。使用金刚砂片在分叉处水平去除样本的远中颊根和腭根。术前使用“Endoanalyser”软件在X线片上测量施奈德角。该角度通过绘制两条线来测量：一条在冠方三分之一处与根管长轴平行，另一条从根尖孔出发与第一条线离开根管长轴的点相交。然后根据制造商的说明，分别使用Protaper手动锉、RP锉、HeroShaper手动锉和旋转Hero Shaper锉系统对每组根管进行预备。获取所有样本的直接数字化X线影像。然后，将样本进行CBCT扫描以评估其单尖牙胶尖的适配情况。使用美国纽约州阿蒙克市IBM公司的SPSS 20软件对数据进行分析。
不同锉系统单尖牙胶尖适配时不存在任何间隙区域的原假设被拒绝。旋转Hero Shaper锉系统的间隙面积最小（0.001mm），而手动Protaper（HP）锉系统的间隙面积最大（0.015mm）。
CBCT是检测弯曲根管充填后间隙区域的有用工具。HP单尖牙胶尖适配的间隙面积最大，旋转Hero Shaper单尖牙胶尖适配的间隙面积最小。
