Torsional Resistance of Two New Heat Treated Nickel Titanium Rotary Instruments: An in Vitro Evaluation

Gambarini, Gianluca; Miccoli, Gabriele; Nardo, Dario Di; Giudice, Andrea Del; Mazzoni, Alessandro; Salvetti, Marco; Testarelli, Luca

doi:10.1590/pboci.2020.156

Cited by 11 publications

(8 citation statements)

References 36 publications

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“…PTUR instruments are essentially made of NiTi in the austenite phase, while XP instruments use a MaxWire technology (Martensite-Austenite electropolish-fleX). The latter provides for better adaption to the root canal anatomy's original shape during preparation and makes the file extremely more flexible [ 24 ].…”

Section: Discussionmentioning

confidence: 99%

A Digital Microscopic Inspection of Dentinal Defects after Using Endodontic Retreatment Files

AbuMostafa

Almoqayyad

Al‐Omari

2021

International Journal of Dentistry

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Aim. The study aimed at evaluating the incidence of dentinal defects after root canal retreatment with ProTaper Universal retreatment (PTUR) and XP-endo Shaper and Finisher R (XP). Materials and Methods. Sixty extracted single-rooted human premolars were selected and divided into 4 groups of 15 teeth each. In the negative control group, the teeth were left unprepared. In the positive control group, the teeth were prepared with ProTaper Next and obturated with no further retreatment. In the PTUR and XP groups, the teeth were prepared and obturated followed by removal of the filling material at body temperature using PTUR and XP instruments, respectively. The roots were then sectioned at 3, 6, and 9 mm from the apex and observed under a digital microscope to detect defects. Results. PTUR group showed significantly higher ( p value <0.05) incidence of defects than the other groups. Comparison of no defects versus defects between groups in different areas of root canals demonstrated significant difference among the groups in the apical and cervical regions. Conclusion. Within the limitations of the present study, PTUR files created significantly more dentinal defects than XP files, with most of those defects at the cervical and apical areas of the root canals.

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Section: Discussionmentioning

confidence: 99%

A Digital Microscopic Inspection of Dentinal Defects after Using Endodontic Retreatment Files

AbuMostafa

Almoqayyad

Al‐Omari

2021

International Journal of Dentistry

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“…4,6 For this reason, in recent literature many studies focused their attention on NiTi torsional behavior. 7,8 Recent studies investigated the role of two prevailing factors affecting torsional resistance, that is, heat treatments and the metal mass of the instrument. [7][8][9] According to the most recent literature, static torsional resistance tests have been evaluated as described by International Organization for Standardization (ISO) 3630-1.…”

Section: Introductionmentioning

confidence: 99%

“…7,8 Recent studies investigated the role of two prevailing factors affecting torsional resistance, that is, heat treatments and the metal mass of the instrument. [7][8][9] According to the most recent literature, static torsional resistance tests have been evaluated as described by International Organization for Standardization (ISO) 3630-1. According to this, to evaluate torsional resistance, a stainless steel (SS) instrument is rotated at 2 rpm with its tip blocked at 3 mm until fracture and the torque generated is calculated by a torque meter.…”

Section: Introductionmentioning

confidence: 99%

Nickel–Titanium Rotary Instruments: An In Vitro Comparison (Torsional Resistance of Two Heat-treated Reciprocating Files)

Bhandi

Salvetti

Donfrancesco

et al. 2021

The Journal of Contemporary Dental Practice

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Aim: The present study aims to evaluate the difference in torsional resistance of two reciprocating nickel-titanium (NiTi) rotary files: WaveOne Gold and EdgeOne Fire. Materials and methods: A total of 40 nickel-titanium rotary instruments (n = 40): 20 WaveOne Gold Small (WOGS) and 20 EdgeOne Fire Small (EOFS) were divided into two groups. Each instrument was tested using a torsional resistance device already validated in previous studies to evaluate and compare torsional resistance. The static torsional test was implemented by blocking each instrument at 3 mm from the tip and rotating it until fracture with a reciprocating motion. Torque to fracture (TtF) and fragment length (FL) were measured and statistically analyzed. Results: Statistical analysis of TtF found significant differences between the two groups (p <0.05). The EOFS showed higher TtF if compared to WOGS, with a mean value and a standard deviation of 3.05 ± 0.07 (N cm) against 2.97 ± 0.08 (N cm). Data for FL showed no significant differences (p >0.05) between the two groups. Conclusion:According to the results of this study, it is reasonable to assert that EOFS instruments showed a higher torsional resistance if compared to the WOGS. Clinical significance: As evidenced by this study, EOFS should be considered as a safer solution, in terms of torsional resistance, if compared to WOGS, reducing the risk of intracanal separation due to excessive torsional load.

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“…In the modern dental clinics, rotary endodontic instruments, particularly those made of NiTi alloys, are commonly employed in root canal treatment. The NiTi instruments possess several favorable properties such as corrosion resistance and superelasticity with excellent shape memory that enable them to easily navigate through the intricate root canal systems to achieve the required cleaning and shaping [ 28 , 29 ]. In spite of these favorable properties, fatigue and failure result in possible intracanal fracture of the instrument.…”

Section: Introductionmentioning

confidence: 99%

Impact of Peracetic Acid on the Dynamic Cyclic Fatigue of Heat-Treated Nickel-Titanium Rotary Endodontic Instrument

Al-Nasrawi

Jaber

Al-Quraine

et al. 2021

International Journal of Dentistry

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Peracetic acid (PAA) is widely used as a sterilizing/disinfecting agent, and, in endodontics, it has been introduced as a promising irrigant in root canal treatment. It has been used at different concentrations to achieve various functions. However, endodontic instruments in contact with PAA of a certain concentration may affect their fatigue resistance. Therefore, the aim of this study was to investigate the impact of PAA on the cyclic fatigue resistance of three commercial heat-treated nickel-titanium (NiTi) rotary files. Three types of heat-treated NiTi rotary files were selected: One Curve (OC), ProTaper Gold (PTG), and Wave One Gold (WOG). Each type was divided into three subgroups (n = 6 for each file type): (1) untreated instruments; (2) files immersed in 0.002% PAA; and (3) files immersed in 0.35% PAA. The performance of each file type was tested in a simulated canal. The number of cycles to fracture (NCF) was determined to assess cyclic fatigue resistance of the files. Independent sample t-test was applied to compare each treated file within a subgroup with its respective control group, and one-way ANOVA was used for comparison among the main groups. All types of tested files revealed a significant decline in the cyclic fatigue resistance after exposure to 0.002% PAA except the PTG ( P = 0.209 ). After exposure of the files to a higher concentration (0.35% PAA), a dramatic reduction was demonstrated by all the groups. Before and after exposure of the files to PAA, PTG displayed the highest cyclic fatigue resistance, followed by the WOG, while the OC showed the lowest resistance. Exposure of heated-treated NiTi files to PAA in a relatively high or low concentration adversely affects the cyclic fatigue resistance. The PTG files demonstrated the best performance among the tested types and can be disinfected with 0.002% PAA for clinical purpose.

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Torsional Resistance of Two New Heat Treated Nickel Titanium Rotary Instruments: An in Vitro Evaluation

Abstract: resistance of two new heat treated nickel titanium rotary instruments: an in vitro evaluation.

Cited by 11 publications

References 36 publications

A Digital Microscopic Inspection of Dentinal Defects after Using Endodontic Retreatment Files

A Digital Microscopic Inspection of Dentinal Defects after Using Endodontic Retreatment Files

Nickel–Titanium Rotary Instruments: An In Vitro Comparison (Torsional Resistance of Two Heat-treated Reciprocating Files)

Impact of Peracetic Acid on the Dynamic Cyclic Fatigue of Heat-Treated Nickel-Titanium Rotary Endodontic Instrument

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