Department of Prosthodontics and Oral and Facial Surgery, Federal University of Pernambuco, Recife, PE, Brazil.
J Appl Oral Sci. 2009 Nov-Dec;17(6):590-5. doi: 10.1590/s1678-77572009000600010.
The aim of this study was to examine the instrumented walls of root canals prepared with the ProTaper Universal rotary system.
Twenty mesiobuccal canals of human first mandibular molars were divided into 2 groups of 10 specimens each and embedded in a muffle system. The root canals were transversely sectioned 3 mm short of the apex before preparation and remounted in their molds. All root canals were prepared with ProTaper Universal rotary system or with Nitiflex files. The pre and postoperative images of the apical thirds viewed with a stereoscopic magnifier (X45) were captured digitally for further analysis. Data were analyzed statistically by Fisher's exact test and Chi-square test at 5% significance level.
The differences observed between the instrumented and the noninstrumented walls were not statistically significant (p<0.05).
The Nitiflex files and the ProTaper Universal rotary system failed to instrument all the root canal walls.
本研究旨在检查使用 ProTaper Universal 旋转系统预备的根管的器械壁。
将 20 个人类第一下颌磨牙的近中颊根管分为两组，每组 10 个标本，分别嵌入消音器系统中。在预备前将根管在根尖 3 毫米处横断，并重新安装在其模具中。所有根管均使用 ProTaper Universal 旋转系统或 Nitiflex 锉预备。使用立体放大镜（X45）拍摄根尖三分之一的术前和术后图像，并进行数字化进一步分析。使用 Fisher 确切检验和 Chi-square 检验在 5%显着性水平下对数据进行统计分析。
器械壁与非器械壁之间观察到的差异无统计学意义（p<0.05）。
Nitiflex 锉和 ProTaper Universal 旋转系统未能预备所有根管壁。
