Nassar Sulfia, Shetty Harish Kumar, Nair Prathap M S, Gowri Sree, Jayaprakash K
Department of Conservative Dentistry and Endodontics, Yenepoya Dental College, Yenepoya (Deemed to be University), Mangalore, Karnataka, India.
Department of Dental Materials, Biomaterials, and Research Center, Yenepoya Dental College, Yenepoya (Deemed to be University), Mangalore, Karnataka, India.
J Pharm Bioallied Sci. 2022 Jul;14(Suppl 1):S600-S604. doi: 10.4103/jpbs.jpbs_739_21. Epub 2022 Jul 13.
The study aims to compare and evaluate the fracture resistance of endodontically treated bicuspids instrumented with Hand Files, TruNatomy (TRN), ProTaper Next (PTN), ProTaper Gold (PTG), and WaveOne (WO).
In total, 45 extracted single-rooted human premolar teeth were selected and sectioned at or below the cementoenamel junction to obtain roots 15 mm long. The samples were divided into four experimental groups and one control group ( = 9): instrumentation with nickel-titanium (NiTi) Hand Files (control group), instrumentation with TRN files, instrumentation with PTN files, instrumentation with PTG files, and instrumentation with WO files. The samples were obturated by lateral compaction technique using gutta-percha points and AH Plus sealer. A vertical load was applied to the tooth using the universal testing machine (Tecsol-TSI-BDS-2Kn-Sr No. 170710) for the fracture resistance test. Statistical analysis was performed.
The study reported that teeth instrumented with NiTi hand files exhibited the highest fracture resistance when compared to all the rotary and reciprocating file systems. Among rotary and reciprocating instruments, root prepared with TRN files showed the most significant resistance to fracture compared with PTN, PTG, and WO files.
Within the limitations of this study, it can be concluded that minimally invasive instrumentation of the system preserves more pericervical dentin, which may increase the resistance to fracture. Results of this study and other studies support the use of minimally tapered instruments to improve the fracture resistance of endodontically treated teeth.
本研究旨在比较和评估使用手动锉、TruNatomy（TRN）、ProTaper Next（PTN）、ProTaper Gold（PTG）和WaveOne（WO）对经根管治疗的双尖牙进行根管预备后的抗折性能。
共选取45颗拔除的单根人前磨牙，在牙骨质牙釉质界或其下方进行切割，以获得15毫米长的牙根。将样本分为四个实验组和一个对照组（每组n = 9）：使用镍钛（NiTi）手动锉进行根管预备（对照组）、使用TRN锉进行根管预备、使用PTN锉进行根管预备、使用PTG锉进行根管预备以及使用WO锉进行根管预备。使用牙胶尖和AH Plus封闭剂通过侧向加压技术对样本进行根管充填。使用万能试验机（Tecsol - TSI - BDS - 2Kn - Sr No. 170710）对牙齿施加垂直载荷以进行抗折试验。进行了统计分析。
该研究报告称，与所有旋转和往复锉系统相比，使用NiTi手动锉预备的牙齿表现出最高的抗折性能。在旋转和往复器械中，与PTN、PTG和WO锉相比，使用TRN锉预备的牙根显示出最显著的抗折性能。
在本研究的局限性范围内，可以得出结论，该系统的微创根管预备保留了更多的颈周牙本质，这可能会增加抗折性能。本研究及其他研究的结果支持使用微锥度器械来提高经根管治疗牙齿的抗折性能。
