Department of Endodontics, University of Pennsylvania, School of Dental Medicine, Philadelphia, Pennsylvania 19104, USA.
J Endod. 2010 Jan;36(1):123-5. doi: 10.1016/j.joen.2009.09.015.
The aim of this study was to evaluate apical transportation and working length changes after instrumentation using EndoSequence (Brasseler USA, Savannah, GA) and Guidance V-taper (Guidance Endo, Albuquerque, NM) rotary files.
Forty-four mesiobuccal and mesiolingual canals of extracted mandibular first and second molars were instrumented by using EndoSequence or Guidance NiTi rotary files. Group 1 (n = 22) was instrumented with EndoSequence #30/.06, #25/.06, and #20/.06 files in a crown-down technique until apical enlargement with #25/.06 was achieved at the working length. Group 2 (n = 22) was instrumented with Guidance #30/.10, #25/.08, and #20/.06 files in a crown-down method until apical enlargement with #25/.08 was reached. A double digital radiographic technique was used to measure the loss of working length and canal transportation at 0, 1, and 3 mm from the working length. Measurements were analyzed by using repeated-measures analysis of variance.
The average amount of transportation at 0, 1, and 3 mm was 0.077 mm, 0.039 mm, and 0.040 mm for the EndoSequence group and 0.066 mm, 0.046 mm, and 0.05 mm for the Guidance group, respectively. The loss of working length was 0.001 mm for the EndoSequence group and -0.002 mm for the Guidance group.
There was no statistically significant difference in the loss of working length or transportation at the measured level between EndoSequence and Guidance rotary files.
本研究旨在评估使用 EndoSequence（美国 Brasseler，萨凡纳，GA）和 Guidance V-taper（Guidance Endo，新墨西哥州阿尔伯克基）旋转锉进行根管预备后牙本质的尖端运输和工作长度的变化。
从下颌第一和第二磨牙中提取了 44 个近中颊和近中舌根管，并用 EndoSequence 或 Guidance NiTi 旋转锉进行根管预备。第 1 组（n = 22）用 EndoSequence #30/.06、#25/.06 和 #20/.06 锉进行冠向下技术预备，直至用 #25/.06 锉达到根尖扩大至工作长度。第 2 组（n = 22）用 Guidance #30/.10、#25/.08 和 #20/.06 锉进行冠向下法预备，直至用 #25/.08 锉达到根尖扩大至工作长度。采用双数字射线照相技术测量距工作长度 0、1 和 3mm 处工作长度的损失和根管运输。采用重复测量方差分析对测量结果进行分析。
EndoSequence 组在 0、1 和 3mm 处的平均运输量分别为 0.077mm、0.039mm 和 0.040mm，而 Guidance 组分别为 0.066mm、0.046mm 和 0.05mm。EndoSequence 组工作长度的损失为 0.001mm，而 Guidance 组为-0.002mm。
在测量水平上，EndoSequence 和 Guidance 旋转锉的工作长度损失或运输量没有统计学上的显著差异。
