Shaping Ability of New Stainless-steel Files in Simulated Canals: in Vitro Study

doi:10.13701/j.cnki.kqyxyj.2021.08.011

Abstract

Abstract: Objective: To compare the shaping ability of Gentlefile (GF), an unique stainless-steel (SS) rotary system, and Protaper (PT), a popular mechanical nickel-titanium (NiTi) system, in J-shaped simulated canals. Methods: Thirty-three resin blocks with a J-shaped canal were selected and randomly divided into 3 groups according to tip diameters: Group 1, GF red (#23); Group 2, PT F2 (#25); and Group 3, GF blue (#26). Specimens were photographed and processed by dental operating microscope and software before and after preparation. The centering ability and canal transportation in different dimensions were calculated. Canal aberration and instrument separation were also recorded. The changes of the instruments were observed by scanning electron microscope. Results: Two cases of instrument separation of GF were noted. The GF system was significantly more centered and less transported than PT F2 in the apical and middle section. There was no difference between two GF instruments. Scanning electron microscope showed that GF instruments were damaged in apical segment, but PT instruments has similar surface morphology compared with the new file. Conclusion: GF showed better anti transportation ability. However, it is recommended to use the new file only once for its probability to be damaged.

Key words: Gentlefile, Protaper, root canal preparation, root canal shaping

CHEN Xixiong, GE Jiuyu. Shaping Ability of New Stainless-steel Files in Simulated Canals: in Vitro Study[J]. Journal of Oral Science Research, 2021, 37(8): 722-726.

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