Shaping ability of GT™ Rotary Files in simulated resin root canals
Shaping ability of GT™ Rotary Files in simulated resin root canals
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DOI：
10.1046/j.1365-2591.2002.00540.x
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发表时间：
2002-07-01
影响因子：
5
通讯作者：
De Moor, RJG
中科院分区：
文献类型：
--
作者：
Calberson, FLG;Deroose, CAJG;De Moor, RJG
目的研究GT（TM）旋转锉在模拟根管中的成形能力，方法采用冠下/后退法预备40个不同角度（40 °和60 °）和弯曲位置（弯曲前直线段：8 mm和12 mm）的根管。将使用图像分析系统记录的术前和术后图片叠加，并记录像差。分别在根管口（0）、直段中点（HO）、弯曲起点（BC）、弯曲顶点（AC）和端点（EP）5个不同点进行测量。一共有八个拉链和一个窗台。AC、BC、HO三种根管形态的根管总宽度有显著性差异（P < 0.001）。在AC、BC和HO处从曲线外侧去除的树脂量存在显著差异（P ≤ 0.001）;在所有5个测量点（O、AC和EP（P < 0.05）和HO和BC（P < 0.001））从曲线内侧去除的树脂量存在显著差异。无论弯曲角度如何，直段12 mm的根管均向根管内侧移动，直段8 mm的根管在5个测量点均向根管外侧移动，弯曲角度为40°的根管在AC、BC和HO处均向根管外侧移动。在狭窄和弯曲的渠道中，渠道的直线段的长度比弯曲的角度更能决定运输的方向。在60°曲线中，使用0.04锥形手术工具时发现手术工具变形的发生率较高。
Aim The aim of this study was to determine the shaping ability of GT(TM) Rotary Files in simulated root canals.Methodology Forty canals with four different shapes in terms of angle (40degrees and 60degrees) and position of curvature (straight section before curve: 8 and 12 mm) were prepared using a crown-down/stepback technique. Pre-operative and post-operative pictures, recorded using an image analysis system, were superimposed and aberrations recorded. Measurements were carried out at 5 different points: at the canal orifice (0); half-way to the orifice in the straight section (HO); the beginning of the curve (BC); the apex of the curve (AC); the endpoint (EP).Results Two instrument fractures occurred and 9 instruments were deformed. Overall, eight zips and one ledge were created. There were significant differences (P < 0.001) for the total width of the canals between the various canal shapes at AC, BC and HO. There were significant differences (P ≤ 0.001) for the amount of resin removed from the outer aspect of the curve at AC, BC and HO; and for the amount of resin removed from the inner aspect of the curve at all five measuring points (O, AC and EP (P < 0.05) and HO and BC (P < 0.001)). Mean transportation was towards the inner aspect of the canal in canals with straight sections of 12 mm regardless the curve angle: towards the outer aspect in canals with straight sections of 8 mm and 40° curves at all the five measuring points, and at AC, BC and HO when the curve was 60°,Conclusions Under the conditions of this study, GT(T)M Rotary Files produced acceptable canal shapes. in narrow and curved canals, the length of the straight section of the canal determines the direction of transportation more than the angle of the curve. In the 60° curves, a high incidence of instrument deformation was found when using the 0.04 tapered instruments.