Forghani Maryam, Hezarjaribi Maryam, Teimouri Hamidreza
Dental Materials Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Postgraduate student of Operative Dentistry, Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
J Clin Exp Dent. 2017 Apr 1;9(4):e556-e559. doi: 10.4317/jced.53476. eCollection 2017 Apr.
The aim of this study was to compare the shaping characteristics of two types of nickel-titanium endodontic file systems with regard to the following parameters: Canal straightening, Canal deviation and Instrumentation time.
Fifty severely curved canals simulated in resin blocks were prepared to an apical size 25 using Protaper Universal orNeolix systems (n=25 canals/group). The angle of canal curvature was determined before and after instrumentation. Pre- and post-operative images were superimposed to determine any canal deviation. The instrumentation time was also recorded. The data were statistically analyzed by using independent sample t-test and the Mann-Whitney U-test.
There were no significant differences between the groups in terms of the change in canal angle ( > 0.05). The Neolix system produced less canal deviation at 7 of the 12 measuring points (<0.05). The Neolix system also required less instrumentation time (<0.05).
Both rotary systems were capable of maintaining the original curvature of the root canal; however, the Neolix system resulted in less canal deviation as well as shorter instrumentation time. Apical foramen,canal transportation, nickel-titanium instruments, Protaper Universal, root canal preparation.
本研究的目的是比较两种镍钛根管锉系统在以下参数方面的塑形特点：根管变直、根管偏移和预备时间。
使用ProTaper Universal或Neolix系统（每组25个根管）将树脂块中模拟的50个严重弯曲根管预备至根尖尺寸25。在预备前后测定根管弯曲角度。将术前和术后图像叠加以确定任何根管偏移。还记录了预备时间。使用独立样本t检验和曼-惠特尼U检验对数据进行统计学分析。
两组之间在根管角度变化方面无显著差异（>0.05）。Neolix系统在12个测量点中的7个点产生的根管偏移较少（<0.05）。Neolix系统还需要较少的预备时间（<0.05）。
两种旋转系统都能够保持根管的原始弯曲度；然而，Neolix系统导致的根管偏移较少且预备时间较短。根尖孔、根管偏移、镍钛器械、ProTaper Universal、根管预备。
