Venino Pier Matteo, Citterio Claudio Luigi, Pellegatta Alberto, Ciccarelli Marta, Maddalone Marcello
School of Dental Medicine, University of Milano-Bicocca - San Gerardo Hospital, Monza, Monza and Brianza, Italy.
School of Dental Medicine, University of Milano-Bicocca - San Gerardo Hospital, Monza, Monza and Brianza, Italy.
J Endod. 2017 Apr;43(4):628-632. doi: 10.1016/j.joen.2016.11.022. Epub 2017 Feb 16.
The aim of this study was to evaluate and compare, by means of micro-computed tomography imaging, the shaping ability of ProTaper Next (PTN) and the novel HyFlex EDM (HFEDM) instruments.
Forty teeth were randomly divided into 2 groups and prepared with PTN or HFEDM. Root canal transportation and centering ratio were evaluated in mesiodistal and buccolingual directions at 5 levels (at the midpoint of the apical, middle, and coronal thirds and at the boundaries between them). Variations in volume, surface, and cross-sectional shape were measured for the apical, middle, and coronal thirds. The null hypotheses were that no differences existed between the 2 groups. The D'Agostino-Pearson test (α = .05) was conducted to assess the normality of the data sets. The distributions were compared by using the Mann-Whitney test (α = .05).
Statistically significant differences (P < .005) were recorded only for buccolingual canal transportation and centering ratio at the section between the middle and coronal thirds, where HFEDM files were superior.
HFEDM and PTN files were similarly effective, and both safely prepared the root canals, respecting their original anatomies. HFEDM files performed better in terms of buccolingual canal transportation and centering ratio at the section between the middle and coronal thirds.
本研究的目的是通过微计算机断层扫描成像来评估和比较ProTaper Next（PTN）器械和新型HyFlex EDM（HFEDM）器械的根管预备能力。
将40颗牙齿随机分为2组，分别用PTN或HFEDM进行预备。在根尖、中部和冠部三分之一的中点及其交界处的5个水平上，评估根管在近远中方向和颊舌方向的偏移及就位率。测量根尖、中部和冠部三分之一的体积、表面积和横截面形状的变化。原假设是两组之间不存在差异。采用D'Agostino-Pearson检验（α = 0.05）评估数据集的正态性。使用Mann-Whitney检验（α = 0.05）比较分布情况。
仅在中部和冠部三分之一之间的截面处，颊舌向根管偏移和就位率存在统计学显著差异（P < 0.005），其中HFEDM锉表现更优。
HFEDM和PTN锉同样有效，并且都能安全地预备根管，保持其原始解剖形态。在中部和冠部三分之一之间的截面处，HFEDM锉在颊舌向根管偏移和就位率方面表现更佳。
