Thompson S A, Dummer P M
Department of Restorative Dentistry, University of Wales College of Medicine, Cardiff, UK.
Int Endod J. 1998 Jul;31(4):259-67. doi: 10.1046/j.1365-2591.1998.00151.x.
The aim of this study was to determine the shaping ability of Quantec Series 2000 nickel-titanium instruments in simulated canals. A total of 40 simulated root canals made up of four different shapes in terms of angle and position of curvature were prepared by Quantec instruments using the technique recommended by the manufacturer. Part 1 of this two-part report describes the efficacy of the instruments in terms of preparation time, instrument failure, canal blockages, change in canal length and three-dimensional canal form. The time necessary for canal preparation was on average 5.7 min and was significantly influenced (P < 0.01) by canal shape. One instrument fractured and three size nine instruments deformed; however, canal shape did not influence significantly instrument failure. All of the canals remained patent, none became blocked with debris. The majority of the canals maintained working distance (26 out of 40), however the mean change in length differed significantly (P < 0.05) between canal types. Overall, canals with 40 degrees curves lost length whilst those with 20 degrees curves gained in length. Examination of intracanal impressions revealed that preparation with Quantec Series 2000 instruments produced canals with definite apical stops, smooth canal walls and good flow and taper. However, the quality of apical smoothness and flow was influenced significantly (P < 0.0001) by canal shape with specimens having 40 degrees canals displaying less desirable qualities. Under the conditions of this study, Quantec Series 2000 rotary nickel-titanium instruments prepared simulated canals rapidly, safely and with good three-dimensional form.
本研究的目的是确定Quantec 2000系列镍钛器械在模拟根管中的塑形能力。使用Quantec器械按照制造商推荐的技术，制备了总共40个模拟根管，这些根管在弯曲角度和位置方面有四种不同形状。这份两部分报告的第一部分从预备时间、器械折断、根管堵塞、根管长度变化和三维根管形态方面描述了器械的有效性。根管预备所需的平均时间为5.7分钟，并且受到根管形状的显著影响（P < 0.01）。有一根器械折断，三根9号器械变形；然而，根管形状对器械折断没有显著影响。所有根管均保持通畅，没有一根被碎屑堵塞。大多数根管保持了工作长度（40根中有26根），然而不同类型根管的平均长度变化有显著差异（P < 0.05）。总体而言，40度弯曲的根管长度缩短，而20度弯曲的根管长度增加。对根管内印模的检查显示，使用Quantec 2000系列器械预备后，根管有明确的根尖止点、光滑的根管壁以及良好的流畅性和锥度。然而，根尖光滑度和流畅性的质量受到根管形状的显著影响（P < 0.0001），40度弯曲根管的标本表现出不太理想的质量。在本研究条件下，Quantec 2000系列旋转镍钛器械能快速、安全地预备模拟根管，并具有良好的三维形态。
