Madureira Rui Gonçalves, Forner Navarro Leopoldo, Llena Mari Carmen, Costa Marcia
Centro de Investigação em Ciências da Saúde, Instituto Superior de Ciências da Saúde-Norte, CESPU, Gandra, Portugal.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2010 Feb;109(2):e136-44. doi: 10.1016/j.tripleo.2009.09.020. Epub 2009 Dec 6.
The aim of this study was to compare the shaping ability of 4 nickel-titanium rotary techniques and 1 hand technique in simulated S-shaped curved root canals.
Seventy-five simulated double-curved resin root canals were divided into 5 groups (n = 15). The canals were compared at 12 different levels and at 3 different times: before preparation and after preparation to master apical 25 and 35. Data were statistically analyzed by performing 2-by-2 comparisons with the Tukey parametric test of variance analysis using a confidence interval of 95%.
All of the 75 resin blocks presented transportation of the root canals by transforming the apical curvature into a straight zone and straightening the first curvature. When increasing the diameter from 25 to 35, both curvatures were straightened.
Based on the conditions of this study, we can say that the flexibility of the instruments is inversely related with the transportation of the root canals, and that in the double-curved root canals, the apical curvature is always straightened.
本研究旨在比较4种镍钛旋转技术和1种手动技术在模拟S形弯曲根管中的塑形能力。
将75个模拟双弯曲树脂根管分为5组（n = 15）。在12个不同水平和3个不同时间点对根管进行比较：预备前、预备至根尖25和35后。数据采用95%置信区间的Tukey参数方差分析进行2×2比较，并进行统计学分析。
所有75个树脂块均通过将根尖弯曲转化为直线段并拉直第一弯曲，使根管出现移位。当直径从25增加到35时，两个弯曲均被拉直。
基于本研究的条件，我们可以说器械的柔韧性与根管移位呈负相关，并且在双弯曲根管中，根尖弯曲总是被拉直。
