Subedar Alreem, Singh Shishir, Podar Rajesh, Laha Abhishek, Salgar Avinash, Shetty Roshan, Sitlaney Teena
Department of Conservative Dentistry and Endodontics, Terna Dental College, Navi Mumbai, Maharashtra, India.
Department of Conservative Dentistry and Endodontics, Buddha Institute of Dental Sciences and Hospital, Patna, Bihar, India.
J Conserv Dent Endod. 2024 Jul;27(7):719-723. doi: 10.4103/jcd.jcd_310_23. Epub 2024 Jul 8.
The objective of the present research was to assess and compare the residual dentin thickness after biomechanical preparation of teeth using three distinct rotary nickel-titanium (Ni-Ti) file systems.
In the current experimental study, a total of 45 single-rooted teeth were selected for the analysis. The cementoenamel junction of each tooth was decoronated using a diamond disc. The teeth were randomly allocated to three groups, with each group representing a different rotary file system: Group 1: Hero GOLD (Micro Mega), Group 2: One Curve (Micro Mega), and Group 3: HyFlex electro-discharge machining (EDM) (Coltene-Whaledent, Altstatten, Switzerland). To evaluate the initial condition of the teeth, cone-beam computed tomography (CBCT) scans were conducted before the biomechanical preparation. The teeth were positioned on a modeling wax sheet, and the CBCT scans provided baseline measurements. The biomechanical preparation of the root canals followed the manufacturer's recommended guidelines for each file system. After the completion of the canal preparation, follow-up CBCT scans were conducted. The postprocedure CBCT scans were then compared with the initial scans to assess any changes in the residual thickness of dentin in the teeth.
Tukey analysis of variance tests was utilized to examine differences between the groups. A statistically significant result was defined as = 0.05 or less for every test.
The comparison of preinstrumentation and postinstrumentation CBCT images showed that the HyFlex EDM group removed less dentin clinically compared to the other two groups, i.e., Hero GOLD and One Curve. No significant statistical difference was found between Hero GOLD versus One Curve, One Curve versus HyFlex EDM, and Hero GOLD versus HyFlex EDM.
Based on the results of this study, the HyFlex EDM file system exhibited superior cutting efficiency at various levels. Nonetheless, additional investigations are required to comprehensively assess the influence of Ni-Ti rotary file systems on the remaining dentin thickness.
本研究的目的是评估和比较使用三种不同的旋转镍钛（Ni-Ti）锉系统对牙齿进行生物力学预备后的剩余牙本质厚度。
在当前的实验研究中，共选择45颗单根牙进行分析。使用金刚石盘去除每颗牙齿的牙骨质釉质界。将牙齿随机分为三组，每组代表一种不同的旋转锉系统：第1组：Hero GOLD（Micro Mega），第2组：One Curve（Micro Mega），第3组：HyFlex电火花加工（EDM）（Coltene-Whaledent，瑞士阿尔特施塔特）。为了评估牙齿的初始状况，在生物力学预备前进行锥形束计算机断层扫描（CBCT）。将牙齿放置在模型蜡片上，CBCT扫描提供基线测量值。根管的生物力学预备遵循每个锉系统制造商推荐的指南。根管预备完成后，进行随访CBCT扫描。然后将术后CBCT扫描与初始扫描进行比较，以评估牙齿中牙本质剩余厚度的任何变化。
采用Tukey方差分析检验来检查组间差异。每次检验的统计学显著结果定义为P = 0.05或更低。
术前和术后CBCT图像的比较显示，与其他两组即Hero GOLD和One Curve相比，HyFlex EDM组在临床上去除的牙本质较少。Hero GOLD与One Curve、One Curve与HyFlex EDM以及Hero GOLD与HyFlex EDM之间未发现显著的统计学差异。
基于本研究结果，HyFlex EDM锉系统在各个水平上均表现出卓越的切割效率。尽管如此，仍需要进一步的研究来全面评估Ni-Ti旋转锉系统对剩余牙本质厚度的影响。
