Journal of Shanghai Jiao Tong University (Medical Science) >

2022 , Vol. 42 >Issue 5: 690 - 694

DOI: https://doi.org/10.3969/j.issn.1674-8115.2022.05.020

Brief original article

Comparison of the central positioning ability of three single-file nickel-titanium instruments in simulated curved root canals

  • Tingting LI ,
  • Yueping PAN
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  • Department of Endodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology, Shanghai 200011
PAN Yueping, E-mail: 87521980@qq.com.

Received date: 2022-01-05

  Accepted date: 2022-04-10

  Online published: 2022-05-28

Supported by

Research Discipline Fund from Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, and College of Stomatology, Shanghai Jiao Tong University(KQYJXK2020)

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Abstract

Objective

·To compare the ability of VDW Reciproc Blue (Blue), FKG XP-endo shaper (XP) and M3-L platinum (M3) instruments to maintain the original curvature of root canal (i.e. central positioning ability) in preparing curved root canals.

Methods

·Thirty resin-simulated curved single root canals were randomly divided into three groups. Root canal preparation was performed with a Blue file, an XP file or an M3 file randomly. Red or blue-black ink was injected into the root canal before and after preparation and photographs were taken under the stomatology surgical microscope. The images before and after preparation were overlapped. The apex of the prepared root was set as a circle center and the radius started at 1 mm. A concentric circle was made every 1 mm increased and sequentially incremented to 10 mm so that it intersected the image to form 10 measurement sites, and then the removal of ten measurement sites on the inside and outside of the root canal was recorded for statistical analysis. After the root canal was prepared the file was observed for tensile deformation under the stomatology surgical microscope.

Results

·There was significant difference in the absolute value of the difference between the internal and external removal of root canal between the M3 group and the Blue group, as well as the M3 group and the XP group (P=0.003 1, P=0.002 0); but there was no significant difference between the Blue group and the XP group (P=0.350). The file body of XP group was observed to have de-helix deformation under the stomatology surgical microscope, which did not return to its original shape when placed in hot water, and no deformation was observed in the file body of M3 group and Blue group.

Conclusion

·The three kinds of single-file nickel-titanium instruments have good formation ability when preparing the curved root canals. But XP file and Blue file can maintain the original curvature of root canals better than M3 file. XP files are prone to deformation when preparing resin root canal, therefore the use of XP should be appropriately reduced clinically.

Key words： root canal preparation; central positioning ability; heat-treated nickel-titanium; curved root canal; single-file nickel-titanium instrument

Cite this article

Tingting LI , Yueping PAN . Comparison of the central positioning ability of three single-file nickel-titanium instruments in simulated curved root canals[J]. Journal of Shanghai Jiao Tong University (Medical Science), 2022 , 42(5) : 690 -694 . DOI: 10.3969/j.issn.1674-8115.2022.05.020

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