Topographic changes in NiTi rotary instruments after the clinical use

2020 ◽  
Vol 46 (3) ◽  
pp. 315-322
Author(s):  
Kasra Karamifar ◽  
Sama Samavi ◽  
Mohammad Ali Saghiri
Keyword(s):  
Clinical Use ◽  
Rotary Instruments ◽  
Niti Rotary Instruments

scholarly journals Comparison of Air-driven vs Electric Torque Control Motors on Canal Centering Ability by ProTaper NiTi Rotary Instruments

2013 ◽  
Vol 14 (1) ◽  
pp. 71-75 ◽  
Author(s):  
Mina Zarei ◽  
Maryam Javidi ◽  
Mahdi Erfanian ◽  
Mahdi Lomee ◽  
Farzaneh Afkhami
Keyword(s):  
Cross Sections ◽  
Root Canal ◽  
Ex Vivo ◽  
Controlled Trial ◽  
Acrylic Resin ◽  
Torque Control ◽  
Rotary Instruments ◽  
Canal Transportation ◽  
Group 2 ◽  
Niti Rotary Instruments

ABSTRACT Aim Cleaning and shaping is one of the most important phases in root canal therapy. Various rotary NiTi systems minimize accidents and facilitate the shaping process. Todays NiTi files are used with air-driven and electric handpieces. This study compared the canal centering after instrumentation using the ProTaper system using Endo IT, electric torque-control motor, and NSK air-driven handpiece. Materials and methods This ex vivo randomized controlled trial study involved 26 mesial mandibular root canals with 10 to 35° curvature. The roots were randomly divided into 2 groups of 13 canals each. The roots were mounted in an endodontic cube with acrylic resin, sectioned horizontally at 2, 6 and 10 mm from the apex and then reassembled. The canals were instrumented according to the manufacturer's instructions using ProTaper rotary files and electric torque-control motors (group 1) or air-driven handpieces (group 2). Photographs of the cross-sections included shots before and after instrumentation, and image analysis was performed using Photoshop software. The centering ability and canal transportation was also evaluated. Repeated measurement and independent t-test provided statistical analysis of canal transportation. Results The comparison of the rate of transportation toward internal or external walls between the two groups was not statistically significant (p = 0.62). Comparison of the rate of transportation of sections within one group was not significant (p = 0.28). Conclusion Use of rotary NiTi file with either electric torquecontrol motor or air-driven handpiece had no effect on canal centering. Clinical significance NiTi rotary instruments can be used with air-driven motors without any considerable changes in root canal anatomy, however it needs the clinician to be expert. How to cite this article Zarei M, Javidi M, Erfanian M, Lomee M, Afkhami F. Comparison of Air-driven vs Electric Torque Control Motors on Canal Centering Ability by ProTaper NiTi Rotary Instruments. J Contemp Dent Pract 2013;14(1):71-75.

scholarly journals Torsional Resistance of Heat-Treated Nickel-Titanium Instruments under Different Temperature Conditions

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5295
Author(s):  
Hyo Jin Jo ◽  
Sang Won Kwak ◽  
Hyeon-Cheol Kim ◽  
Sung Kyo Kim ◽  
Jung-Hong Ha
Keyword(s):  
Nickel Titanium ◽  
Phase Transformation Temperature ◽  
Scanning Calorimetry ◽  
Temperature Conditions ◽  
Torsional Resistance ◽  
Heat Treated ◽  
Rotary Instruments ◽  
Single Use ◽  
Niti Instruments ◽  
Niti Rotary Instruments

This study compared the torsional resistance of heat-treated nickel-titanium (NiTi) instruments under different temperature conditions. Four thermomechanically treated single-use NiTi rotary instruments were selected for this study: OneShape (OS), OneCurve (OC), WaveOne Gold (WOG) and HyFlex EDM (HFE). Each instrument was further subdivided by temperature into 2 subgroups. Maximum torque and the distortion angle until fracture occurred were evaluated. Differential scanning calorimetry analysis was performed to measure the phase transformation temperature. Statistical analysis was performed using a two-way ANOVA and t-test (p < 0.05). Fractured fragments were observed using scanning electron microscopy (SEM). The two-way ANOVA showed no significant differences for different temperature conditions. At both room (RT) and body temperature (BT), OS was predominantly austenite while HFE was martensite. OC and WOG were predominantly martensite at RT and mixed phase at BT. At BT, more than half of WOG was martensite, while half of OC was austenite. SEM examination showed no topographical differences between instruments in different temperature groups. In relation to a limitation of this study, there was no difference in torsional resistance of NiTi rotary instruments between the BT and RT conditions. This implies that clinicians do not need to consider a decrease of torsional resistance of heat-treated NiTi instruments at BT.

Defect propagation in NiTi rotary instruments: a noncontact optical profilometry analysis

2018 ◽  
Vol 51 (11) ◽  
pp. 1271-1278 ◽  
Author(s):  
I. Barbosa ◽  
F. Ferreira ◽  
P. Scelza ◽  
J. Neff ◽  
D. Russano ◽  
...  
Keyword(s):  
Optical Profilometry ◽  
Rotary Instruments ◽  
Niti Rotary Instruments

scholarly journals Evaluation of Gaps or Voids Occurring in Roots Filled with Three Different Sealers

2010 ◽  
Vol 04 (02) ◽  
pp. 101-109 ◽  
Author(s):  
Melek Akman ◽  
Serhan Akman ◽  
Oznur Derinbay ◽  
Sema Belli
Keyword(s):  
In Vitro Study ◽  
Gutta Percha ◽  
Rotary Instruments ◽  
Single Cone ◽  
Ah Plus ◽  
Root Dentin ◽  
The Mean ◽  
Free Interfaces ◽  
Niti Rotary Instruments

Objectives: The purpose of this in vitro study was to evaluate gaps or voids occurring in roots filled with three different sealers.Methods: Thirty extracted human single-rooted teeth were decoronated, instrumented using NiTi rotary instruments, divided into three groups (n=10 per group) and obturated with one of the following: Epiphany with Resilon, MetaSEAL with gutta-percha or AH Plus with gutta-percha using the match-taper single-cone technique. After storage for one week in 100% humidity at 37°C, the teeth were horizontally sectioned (n=10). Photographs were taken from the coronal, median and apical parts of the roots using a stereomicroscope at 10X magnification, and the images were then transferred to a computer. The mathematical method known as the ‘Affine Transformation’ was used for the transformation of pixel coordinates to ground coordinates in the Netcad Software program. The mean areas (μm2) of the gaps between the sealer and root dentin or gutta percha/resilon and the gaps between the sealer and/or voids inside the sealer mass were measured, scored on a 0-3 scale and statistically analyzed with the Kruskal-Wallis test.Results: The mean total area of gaps or voids for each sealer was 4631.80 μm2 for the Epiphany- Resilon, 3826.80 μm2 for the MetaSEAL-gutta-percha and 31334 μm2 for the AH Plus-gutta-percha. The MetaSEAL-gutta-percha group showed more gap or void-free interfaces. No significant differences were found among the sealers in the scores for the gap areas (P<.05), and the MetaSEAL showed similar interfaces with Epiphany.Conclusions: No significant differences in the mean areas of gaps or voids were found among the tested resin-based sealers. (Eur J Dent 2010;4:101-109)

Effect of autoclave sterilization on cyclic fatigue and torsional fracture resistance of NiTi rotary instruments

Odontology ◽  
2019 ◽  
Vol 108 (2) ◽  
pp. 194-201 ◽  
Author(s):  
Wooyoung Kim ◽  
Soram Oh ◽  
Gil-Joo Ryu ◽  
Tae-Hwan Kim ◽  
Sung-Jae Kim ◽  
...  
Keyword(s):  
Fracture Resistance ◽  
Cyclic Fatigue ◽  
Rotary Instruments ◽  
Torsional Fracture ◽  
Niti Rotary Instruments

scholarly journals Removal of a separated endodontic instrument by using the modified hollow tube–based extractor system: A case report

2020 ◽  
Vol 8 ◽  
pp. 2050313X2090782
Author(s):  
Mothanna K AlRahabi ◽  
Hani M Ghabbani
Keyword(s):  
Saudi Arabia ◽  
Case Report ◽  
Root Canal ◽  
Root Canal Treatment ◽  
Simple Method ◽  
Strict Adherence ◽  
System A ◽  
Rotary Instruments ◽  
Niti Rotary Instruments ◽  
Rotary Instrument

The frequency of separation of NiTi rotary instruments has increased with the increasing use of these instruments, and this error may result from inadequate experience of using these instruments. This iatrogenic error can complicate root canal treatment, and special experience is required to manage this problem. This case report describes the management of the separation of an F3 instrument from a ProTaper NiTi rotary system. A 30-year-old man was referred to the College of Dentistry, Taibah University (Saudi Arabia) with an intracanal separated NiTi rotary instrument (F3 of the ProTaper system; Dentsply Maillefer, Ballaigues, Switzerland) in the canal of the maxillary right canine. The separated instrument was removed by using the modified hollow tube–based extractor system. The present case revealed that sometimes a simple method can be an effective alternative of a professional method; using NiTi rotary instruments with strict adherence is important for the prevention of instrument separation.

Failure mechanism of ProTaper Ni-Ti rotary instruments during clinical use: fractographic analysis

2006 ◽  
Vol 39 (3) ◽  
pp. 171-178 ◽  
Author(s):  
A. P. Spanaki-Voreadi ◽  
N. P. Kerezoudis ◽  
S. Zinelis
Keyword(s):  
Failure Mechanism ◽  
Fractographic Analysis ◽  
Clinical Use ◽  
Rotary Instruments

Cyclic fatigue of Profile rotary instruments after simulated clinical use

1999 ◽  
Vol 32 (2) ◽  
pp. 115-119 ◽  
Author(s):  
G. M. Yared ◽  
F. E. Bou Dagher ◽  
P. Machtou
Keyword(s):  
Cyclic Fatigue ◽  
Clinical Use ◽  
Rotary Instruments

Low-cycle fatigue of NiTi rotary instruments in hypochlorite

2009 ◽  
Author(s):  
Fouad Abdulbaky Abduljabbar
Keyword(s):  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Rotary Instruments ◽  
Niti Rotary Instruments
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