Elnaghy Amr M, Al-Dharrab Ayman A, Abbas Hisham M, Elsaka Shaymaa E
Quintessence Int. 2017;48(1):27-32. doi: 10.3290/j.qi.a36895.
To evaluate and compare the volume of removed dentin, transportation, and centering ability of TRUShape (TRS; Dentsply Tulsa Dental Specialties) system with ProTaper Next (PTN; Dentsply Maillefer) by using micro-computed tomography (µCT).
Twenty extracted human mandibular first molars with two separate mesial canals with curvatures of 25 to 35 degrees were divided into two experimental groups (n = 20) according to the rotary nickel-titanium file system used in canal instrumentation as follows: group TRS and group PTN. Canals were scanned before and after instrumentation using µCT to evaluate root canal transportation, centering ratio, and volumetric changes. Data of canal transportation and centering ratio values were analyzed using independent t test. Volume changes data were statistically analyzed using Mann-Whitney test. Statistical significance level was set at P < .05.
The PTN group had a significantly lower mean volume of removed dentin (2.09 ± 0.41 mm3) than the TRS group (2.77 ± 0.72 mm3) (P < .05). At the coronal level, there was no significant difference in canal transportation (P = .170) and centering ratio (P = .111) between TRS and PTN groups. However, at the apical and middle levels, the PTN group had a significantly lower mean transportation value and higher centering ratio than the TRS group (P < .05).
Root canal preparation with the PTN system revealed better performance with fewer canal aberrations than the TRS system in curved root canals.
通过微计算机断层扫描（µCT）评估并比较TRUShape（TRS；登士柏 Tulsa 牙科专业产品公司）系统和 ProTaper Next（PTN；登士柏 Maillefer 公司）系统去除牙本质的体积、根管偏移及根管居中能力。
选取20颗拔除的人下颌第一磨牙，其两个独立的近中根管弯曲度为25至35度，根据根管预备中使用的旋转镍钛锉系统分为两个实验组（n = 20）：TRS组和PTN组。在根管预备前后使用µCT扫描根管，以评估根管偏移、根管居中率和体积变化。使用独立t检验分析根管偏移和根管居中率值的数据。使用曼-惠特尼检验对体积变化数据进行统计学分析。统计学显著性水平设定为P < 0.05。
PTN组去除牙本质的平均体积（2.09±0.41 mm³）显著低于TRS组（2.77±0.72 mm³）（P < 0.05）。在冠部水平，TRS组和PTN组在根管偏移（P = 0.170）和根管居中率（P = 0.111）方面无显著差异。然而，在根尖和中部水平，PTN组的平均偏移值显著低于TRS组，而根管居中率则高于TRS组（P < 0.05）。
在弯曲根管中，与TRS系统相比，使用PTN系统进行根管预备显示出更好的性能，根管偏差更少。
