Merrett Sarah J, Bryant Susan T, Dummer Paul M H
Division of Adult Dental Health, School of Dentistry, Cardiff University, Cardiff, UK.
J Endod. 2006 Oct;32(10):960-2. doi: 10.1016/j.joen.2006.03.002. Epub 2006 Jul 3.
The aim of this study was to compare the shaping ability of RaCe and FlexMaster rotary nickel-titanium instruments in simulated canals. A total of 80 canals with four different shapes were prepared with either RaCe or FlexMaster instruments. Pre- and postoperative images of each canal were recorded and combined using image analysis software. The development of canal aberrations and transportation was assessed. There was a significant difference (p < 0.001) between the systems for time of preparation to apical size 30, .06 taper; FlexMaster instruments took on average 1.86 min and RaCe 1.66 min. One RaCe and two FlexMaster instruments fractured. No zips, elbows, or danger zones were created. One perforation and eight outer widenings were created using FlexMaster instruments; RaCe instruments created two outer widenings. No differences were found between the instruments for direction of transportation. RaCe and FlexMaster nickel-titanium instruments prepared canals rapidly with few aberrations.
本研究的目的是比较RaCe和FlexMaster旋转镍钛器械在模拟根管中的塑形能力。使用RaCe或FlexMaster器械制备了总共80个具有四种不同形状的根管。记录每个根管术前和术后的图像，并使用图像分析软件进行合并。评估根管畸变和根管偏移的情况。在预备至根尖尺寸30、锥度0.06时，两种系统之间存在显著差异（p < 0.001）；FlexMaster器械平均用时1.86分钟，RaCe器械平均用时1.66分钟。1支RaCe器械和2支FlexMaster器械发生折断。未形成拉链状、肘状或危险区。使用FlexMaster器械造成1处穿孔和8处根管壁外侧增宽；RaCe器械造成2处根管壁外侧增宽。两种器械在根管偏移方向上未发现差异。RaCe和FlexMaster镍钛器械能快速预备根管，且畸变较少。
