Silva Emmanuel João Nogueira Leal, Muniz Brenda Leite, Pires Frederico, Belladonna Felipe Gonçalves, Neves Aline Almeida, Souza Erick Miranda, De-Deus Gustavo
Department of Endodontics, Grande Rio University (UNIGRANRIO) School of Dentistry, Rio de Janeiro, RJ, Brazil.
Department of Paediactric Dentistry, Rio de Janeiro Federal University, Rio de Janeiro, RJ, Brazil.
Restor Dent Endod. 2016 Feb;41(1):1-5. doi: 10.5395/rde.2016.41.1.1. Epub 2016 Feb 4.
The purpose of this study was to assess the ability of ProTaper Gold (PTG, Dentsply Maillefer) in maintaining the original profile of root canal anatomy. For that, ProTaper Universal (PTU, Dentsply Maillefer) was used as reference techniques for comparison.
Twenty simulated curved canals manufactured in clear resin blocks were randomly assigned to 2 groups (n = 10) according to the system used for canal instrumentation: PTU and PTG groups, upto F2 files (25/0.08). Color stereomicroscopic images from each block were taken exactly at the same position before and after instrumentation. All image processing and data analysis were performed with an open source program (FIJI). Evaluation of canal transportation was obtained for two independent canal regions: straight and curved levels. Student's t test was used with a cut-off for significance set at α = 5%.
Instrumentation systems significantly influenced canal transportation (p < 0.0001). A significant interaction between instrumentation system and root canal level (p < 0.0001) was found. PTU and PTG systems produced similar canal transportation at the straight part, while PTG system resulted in lower canal transportation than PTU system at the curved part. Canal transportation was higher at the curved canal portion (p < 0.0001).
PTG system produced overall less canal transportation in the curved portion when compared to PTU system.
本研究旨在评估ProTaper Gold（PTG，登士柏迈徕福公司）保持根管解剖原始形态的能力。为此，将ProTaper Universal（PTU，登士柏迈徕福公司）用作比较的参考技术。
根据用于根管预备的系统，将20个由透明树脂块制成的模拟弯曲根管随机分为2组（n = 10）：PTU组和PTG组，预备至F2锉（25/0.08）。在预备前后，在每个树脂块的同一位置精确拍摄彩色立体显微镜图像。所有图像处理和数据分析均使用开源程序（FIJI）进行。对两个独立的根管区域（直线段和弯曲段）进行根管偏移评估。采用学生t检验，显著性临界值设定为α = 5%。
预备系统对根管偏移有显著影响（p < 0.0001）。发现预备系统与根管水平之间存在显著交互作用（p < 0.0001）。PTU系统和PTG系统在直线段产生的根管偏移相似，而在弯曲段，PTG系统导致的根管偏移低于PTU系统。弯曲根管段的根管偏移更高（p < 0.0001）。
与PTU系统相比，PTG系统在弯曲段产生的总体根管偏移较少。
