Pawar Ajinkya M, Pawar Mansing G, Thakur Bhagyashree, Banga Kulwinder Singh, Luke Alexander Maniangat
Department of Conservative Dentistry and Endodontics, Nair Hospital Dental College, Mumbai, Maharashtra, India.
Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Mumbai, Maharashtra, India.
J Conserv Dent. 2018 Jan-Feb;21(1):52-56. doi: 10.4103/JCD.JCD_216_16.
The current study compared the fracture resistance of samples instrumented by two rotary files and a reciprocating file, obturated with gutta-percha and AH Plus.
A total of 60 freshly extracted mandibular premolar teeth with single roots and single canals were acquired and decoronated at or below the cementoenamel junction. The samples were randomly divided into four groups ( = 15). Group 1 control (noninstrumented/obturated), and for Groups 2-4 root canal instrumentation was done by EndoStar E5 (EE5), ProTaper NEXT (PTN), and WaveOne, respectively. Following instrumentation, the samples were obturated using gutta-percha cones and AH Plus sealer using lateral compaction. A week later, vertical load was applied to the specimen's canal in each group until fracture. The loads required for fracture were recorded and statistically analyzed.
The mean loads required to fracture (Newton; N) for the four groups were; 388.54 (±29.93), 310.35 (±26.05), 328.40 (±20.67), and 278.54 (±34.16). The loads exhibited highly significant difference ( < 0.0001; analysis variance). The following Tukey's test confirmed, both samples in Groups 2 and 3 required similar loads for fracture ( > 0.05) and significantly higher than Group 4 ( < 0.01).
The samples instrumented by EE5 and PTN exhibit similar fracture resistance.
本研究比较了用两种旋转锉和一种往复锉预备根管后，使用牙胶尖和AH Plus糊剂充填的样本的抗折性能。
共收集60颗新鲜拔除的单根单管下颌前磨牙，在牙骨质牙釉质界或其下方截冠。样本随机分为四组（每组n = 15）。第1组为对照组（未预备/充填），第2 - 4组分别用EndoStar E5（EE5）、ProTaper NEXT（PTN）和WaveOne进行根管预备。预备后，使用牙胶尖和AH Plus糊剂通过侧向加压法对样本进行充填。一周后，对每组样本的根管施加垂直载荷直至折断。记录折断所需的载荷并进行统计学分析。
四组样本折断所需的平均载荷（牛顿；N）分别为：388.54（±29.93）、310.35（±26.05）、328.40（±20.67）和278.54（±34.16）。载荷显示出高度显著差异（P < 0.0001；方差分析）。随后的Tukey检验证实，第2组和第3组的样本折断所需载荷相似（P > 0.05），且显著高于第4组（P < 0.01）。
用EE5和PTN预备的样本表现出相似的抗折性能。
