Stress Generation during Pecking Motion of Rotary Nickel-titanium Instruments with Different Pecking Depth

Jung Hong Ha, Sang Won Kwak, Asgeir Sigurdsson, Seok Woo Chang, Sung Kyo Kim, Hyeon Cheol Kim

Research output: Contribution to journalArticle

Abstract

Introduction: The aim of this study was to evaluate the effect of different pecking depth on the stress generated by the screw-in forces of a rotating endodontic file in simulated canals. Methods: Twenty simulated resin blocks with a J-shaped curvature were used. Twenty OneG files (MicroMega, Besançon, France) were assigned for a screw-in test depending on the pecking depth in 2 groups (n = 10). The files were operated at 300 rpm, and the up and down speed was controlled at 1 mm/s stroke velocity and a 10-millisecond dwell time using a customized device. The distances (pecking depth) for the pecking motion were 2 mm or 4 mm for each group; "6 mm forward and 4 mm backward" and "6 mm forward and 2 mm backward" movements were applied, respectively, for the 2 pecking groups. During the operation, the positive and negative apical loads were recorded at a rate of 50 Hz using customized software attached to the device. The maximum negative apical load (screw-in force [SF]) was recorded, and the total energy during pecking motion until the file reached the working length (cumulative screw-in forces [CSFs]) was computed. The data were analyzed using an independent t test at a significance level of 95%. Results: No significant difference in SF was found between the 2 groups of pecking depths. However, the longer pecking depth (4-mm group) showed a significantly larger CSF compared with the shorter pecking depth group (P < .05). Conclusions: The shorter pecking depth may generate lower overall stresses for the root dentin as well as the instrument.

Original languageEnglish (US)
JournalJournal of Endodontics
DOIs
StateAccepted/In press - 2017

Fingerprint

Equipment and Supplies
Endodontics
Dentin
France
Software
Stroke
nitinol

Keywords

  • Instrument fracture
  • Nickel-titanium rotary file
  • Pecking depth
  • Screw-in force
  • Stress generation

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Stress Generation during Pecking Motion of Rotary Nickel-titanium Instruments with Different Pecking Depth. / Ha, Jung Hong; Kwak, Sang Won; Sigurdsson, Asgeir; Chang, Seok Woo; Kim, Sung Kyo; Kim, Hyeon Cheol.

In: Journal of Endodontics, 2017.

Research output: Contribution to journalArticle

Ha, Jung Hong ; Kwak, Sang Won ; Sigurdsson, Asgeir ; Chang, Seok Woo ; Kim, Sung Kyo ; Kim, Hyeon Cheol. / Stress Generation during Pecking Motion of Rotary Nickel-titanium Instruments with Different Pecking Depth. In: Journal of Endodontics. 2017.
@article{1544441a32c34c36ad4a8c1008a27b87,
title = "Stress Generation during Pecking Motion of Rotary Nickel-titanium Instruments with Different Pecking Depth",
abstract = "Introduction: The aim of this study was to evaluate the effect of different pecking depth on the stress generated by the screw-in forces of a rotating endodontic file in simulated canals. Methods: Twenty simulated resin blocks with a J-shaped curvature were used. Twenty OneG files (MicroMega, Besan{\cc}on, France) were assigned for a screw-in test depending on the pecking depth in 2 groups (n = 10). The files were operated at 300 rpm, and the up and down speed was controlled at 1 mm/s stroke velocity and a 10-millisecond dwell time using a customized device. The distances (pecking depth) for the pecking motion were 2 mm or 4 mm for each group; {"}6 mm forward and 4 mm backward{"} and {"}6 mm forward and 2 mm backward{"} movements were applied, respectively, for the 2 pecking groups. During the operation, the positive and negative apical loads were recorded at a rate of 50 Hz using customized software attached to the device. The maximum negative apical load (screw-in force [SF]) was recorded, and the total energy during pecking motion until the file reached the working length (cumulative screw-in forces [CSFs]) was computed. The data were analyzed using an independent t test at a significance level of 95{\%}. Results: No significant difference in SF was found between the 2 groups of pecking depths. However, the longer pecking depth (4-mm group) showed a significantly larger CSF compared with the shorter pecking depth group (P < .05). Conclusions: The shorter pecking depth may generate lower overall stresses for the root dentin as well as the instrument.",
keywords = "Instrument fracture, Nickel-titanium rotary file, Pecking depth, Screw-in force, Stress generation",
author = "Ha, {Jung Hong} and Kwak, {Sang Won} and Asgeir Sigurdsson and Chang, {Seok Woo} and Kim, {Sung Kyo} and Kim, {Hyeon Cheol}",
year = "2017",
doi = "10.1016/j.joen.2017.04.013",
language = "English (US)",
journal = "Journal of Endodontics",
issn = "0099-2399",
publisher = "Elsevier Inc.",

}

TY - JOUR

T1 - Stress Generation during Pecking Motion of Rotary Nickel-titanium Instruments with Different Pecking Depth

AU - Ha, Jung Hong

AU - Kwak, Sang Won

AU - Sigurdsson, Asgeir

AU - Chang, Seok Woo

AU - Kim, Sung Kyo

AU - Kim, Hyeon Cheol

PY - 2017

Y1 - 2017

N2 - Introduction: The aim of this study was to evaluate the effect of different pecking depth on the stress generated by the screw-in forces of a rotating endodontic file in simulated canals. Methods: Twenty simulated resin blocks with a J-shaped curvature were used. Twenty OneG files (MicroMega, Besançon, France) were assigned for a screw-in test depending on the pecking depth in 2 groups (n = 10). The files were operated at 300 rpm, and the up and down speed was controlled at 1 mm/s stroke velocity and a 10-millisecond dwell time using a customized device. The distances (pecking depth) for the pecking motion were 2 mm or 4 mm for each group; "6 mm forward and 4 mm backward" and "6 mm forward and 2 mm backward" movements were applied, respectively, for the 2 pecking groups. During the operation, the positive and negative apical loads were recorded at a rate of 50 Hz using customized software attached to the device. The maximum negative apical load (screw-in force [SF]) was recorded, and the total energy during pecking motion until the file reached the working length (cumulative screw-in forces [CSFs]) was computed. The data were analyzed using an independent t test at a significance level of 95%. Results: No significant difference in SF was found between the 2 groups of pecking depths. However, the longer pecking depth (4-mm group) showed a significantly larger CSF compared with the shorter pecking depth group (P < .05). Conclusions: The shorter pecking depth may generate lower overall stresses for the root dentin as well as the instrument.

AB - Introduction: The aim of this study was to evaluate the effect of different pecking depth on the stress generated by the screw-in forces of a rotating endodontic file in simulated canals. Methods: Twenty simulated resin blocks with a J-shaped curvature were used. Twenty OneG files (MicroMega, Besançon, France) were assigned for a screw-in test depending on the pecking depth in 2 groups (n = 10). The files were operated at 300 rpm, and the up and down speed was controlled at 1 mm/s stroke velocity and a 10-millisecond dwell time using a customized device. The distances (pecking depth) for the pecking motion were 2 mm or 4 mm for each group; "6 mm forward and 4 mm backward" and "6 mm forward and 2 mm backward" movements were applied, respectively, for the 2 pecking groups. During the operation, the positive and negative apical loads were recorded at a rate of 50 Hz using customized software attached to the device. The maximum negative apical load (screw-in force [SF]) was recorded, and the total energy during pecking motion until the file reached the working length (cumulative screw-in forces [CSFs]) was computed. The data were analyzed using an independent t test at a significance level of 95%. Results: No significant difference in SF was found between the 2 groups of pecking depths. However, the longer pecking depth (4-mm group) showed a significantly larger CSF compared with the shorter pecking depth group (P < .05). Conclusions: The shorter pecking depth may generate lower overall stresses for the root dentin as well as the instrument.

KW - Instrument fracture

KW - Nickel-titanium rotary file

KW - Pecking depth

KW - Screw-in force

KW - Stress generation

UR - http://www.scopus.com/inward/record.url?scp=85023633205&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85023633205&partnerID=8YFLogxK

U2 - 10.1016/j.joen.2017.04.013

DO - 10.1016/j.joen.2017.04.013

M3 - Article

C2 - 28720286

AN - SCOPUS:85023633205

JO - Journal of Endodontics

JF - Journal of Endodontics

SN - 0099-2399

ER -