Original Articles
The Shaping Advantage of M-wire Compared with Conventional Nickel-titanium Rotary Instruments in Heavy Curvature Canals
2021 年 1 巻 1 号 p. 44-51
詳細
2021 年 1 巻 1 号 p. 44-51
Background: The purpose of this study was to evaluate the shaping advantage of M-wire NiTi ProTaper NEXT (PTN) compared with a conventional NiTi ProTaper Universal (PTU) file in heavy curvature canals. The shaping ability was measured by the amount of canal cutting and transportation between the PTN and conventional PTU.
Methods: Root canal shaping by the PTN and PTU was classified into two experimental groups according to the final tip size, ISO #25 or ISO #40. Eighty-four J-shaped root canals (10°, 20°, 30° apical curvature) in resin blocks were used.
Results: After adjusting for the level and canal wall side, the mean transportation did not significantly decrease between the PTN and PTU with ISO #25. Significantly less deviation occurred with the PTN and PTU between 10° and 30° using ISO #40.
Conclusions: The PTN improves file flexibility and enables accurate canal shaping for heavy curvature canals.
