Hariprasad R, Anoop V N, Raj P Rajesh, Obulareddy Vishnu Teja, Kunjumon Renju M, Sadula Kiran Kumar
Specialist in Endodontics, Department of Dentistry, Employees State Insurance Corporation Hospital, Ezhukone, Kollam, Kerala, India.
Senior Lecturer, Department of Conservative Dentistry and Endodontics, Noorul Islam College of Dental Sciences, Aralumoodu, Kerala, India.
J Pharm Bioallied Sci. 2021 Nov;13(Suppl 2):S1700-S1704. doi: 10.4103/jpbs.jpbs_355_21. Epub 2021 Nov 10.
One of the disadvantages of stainless steel instruments used for root canal preparation is the lack of flexibility and shape memory. The invention of rotary instruments has been successful in overcoming these problems to a greater extent; however, some drawbacks still remain, one of which is vertical root fracture and the cause for it is microcracks formation in dentin, which in turn causes vertical root fracture. There are enough studies for microcracks using different rotary systems and this study compared microcracks with single as well as reciprocating files followed by final finishing with XP endo finisher. Apart from other studies, we used conefocal laser scanning microscope to assess microcrack propagation before and after instrumentation with each rotary system.
To evaluate microcrack propagation in mandibular molars after root canal preparation with continuous and reciprocating file systems followed by final finishing with XP Endo finisher.
Thirty mandibular molars indicated for the extraction due to periodontal causes were selected for this study. They were divided into three groups based on rotary systems used: Group A: ProTaper universal; Group B: ProTaper gold; and Group C: Waveone gold. All specimens were subjected to scanning before instrumentation to assess the presence of any existing cracks. Cone focal laser microscopic scanning is again repeated for each specimen after instrumentation with each rotary system and also after final finishing with XP Endo finisher.
One-way ANOVA is used.
Crack propagation is the highest with ProTaper universal and least with waveone gold. After final finishing of canals with XP Endo finisher, crack propagation observed was negligible.
The success of root canal treatment depends on effective disinfection of root canal system. XP Endo finisher can be used as a final finishing file by considering its advantageous properties, moreover crack propagation with XP Endo finisher in an previously instrumented canal is negligible.
用于根管预备的不锈钢器械的缺点之一是缺乏柔韧性和形状记忆性。旋转器械的发明在很大程度上成功克服了这些问题；然而，一些缺点仍然存在，其中之一是垂直根折，其原因是牙本质中形成微裂纹，进而导致垂直根折。关于使用不同旋转系统产生微裂纹的研究已经足够多，本研究将微裂纹与单支锉和往复锉进行了比较，随后使用XP根管锉进行最终修整。与其他研究不同的是，我们使用共聚焦激光扫描显微镜评估每种旋转系统器械操作前后微裂纹的扩展情况。
评估使用连续和往复锉系统进行根管预备并随后使用XP根管锉进行最终修整后，下颌磨牙中微裂纹的扩展情况。
本研究选取了30颗因牙周原因而需拔除的下颌磨牙。根据所使用的旋转系统将它们分为三组：A组：ProTaper通用型；B组：ProTaper金标型；C组：Waveone金标型。所有标本在器械操作前进行扫描，以评估是否存在任何现有的裂纹。在使用每种旋转系统对每个标本进行器械操作后，以及在使用XP根管锉进行最终修整后，再次对每个标本进行共聚焦激光显微镜扫描。
采用单因素方差分析。
ProTaper通用型导致的裂纹扩展最高，Waveone金标型导致的裂纹扩展最低。在用XP根管锉对根管进行最终修整后，观察到的裂纹扩展可忽略不计。
根管治疗的成功取决于根管系统的有效消毒。考虑到其有利特性，XP根管锉可作为最终修整锉使用，此外，在先前已进行器械操作的根管中，XP根管锉导致的裂纹扩展可忽略不计。
