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Juan-Gonzalo Olivier, Marc García-Font, Jose-Antonio Gonzalez-Sanchez, Miguel Roig-Cayon, Fernando Durán-Sindreu
BACKGROUND: The objective of the study was to evaluate and compare how apical enlargement with K3 and K3XF nickel-titanium (NiTi) rotary instruments reduces the root thickness in the danger zone and affects canal transportation and centering ability in mandibular molar mesial canals in a manikin extracted tooth model. MATERIAL AND METHODS: Seventy-two mesial root canals of first mandibular molars were instrumented. Initial and post-instrumentation Cone Beam Computed Tomography scans were performed after root canal preparation up to size 25, 30, 35 and 40 files...
October 2016: Journal of Clinical and Experimental Dentistry
Mehmet Emin Kaval, Ismail Davut Capar, Hüseyin Ertas, Bilge Hakan Sen
OBJECTIVE: The purpose of the present study was to evaluate the cyclic fatigue resistance of F6 SkyTaper (Komet Brasseler, Lemgo, Germany), K3XF (SybronEndo, Orange, CA, USA), new generation OneShape (Micro Mega, Besancon, France) and TRUShape 3D conforming files (Dentsply Tulsa Dental Specialties, Tulsa, OK, USA). MATERIAL AND METHODS: Ten instruments from each group were selected and allowed to rotate using a low-torque motor in a stainless steel block with 1...
July 26, 2016: Clinical Oral Investigations
Fabio de Almeida-Gomes, Humberto Ramah Menezes de Matos, Rodrigo Ferreira Lopes Arrais Nunes, Ariel Moura Arrais, Claudio Ferreira-Maniglia, Marcelo de Morais Vitoriano, Eduardo Diogo Gurgel-Filho
OBJECTIVE: The objective of this study is to compare the cyclic fatigue resistance of nine types of endodontic instruments of nickel-titanium. MATERIALS AND METHODS: Five files of 25 mm of length of each group: Reciproc (RC) R25; WaveOne (WO) Primary; Unicone (UC) L25 25/0.06; K3XF 25/0.06; ProTaper Universal F2 (PTF2); ProTaper Next X2 (PTX2); Mtwo 25/0.06; BioRaCe 25/0.06; One Shape L25 25/0.06 were subjected to a cyclic fatigue resistance test on a mechanical apparatus...
May 2016: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
Prashant Monga, Nitika Bajaj, Pardeep Mahajan, Shiwani Garg
Biomechanical preparation is one of the most important steps in endodontic therapy. Rotary instrumentation has facilitated this step. Nowadays the market is flooded with different types of rotary instruments. The present study compared the root dentinal crack formation with continuous rotating versus reciprocating root canal preparation methods. One hundred and fifty freshly extracted teeth were used for the study. They were divided into 5 groups with 30 teeth in each group. Thirty teeth were kept under control group A and no root canal preparation was done for this group...
December 2015: Singapore Dental Journal
H S Topçuoğlu, R Zan, F Akpek, G Topçuoğlu, Ö Ulusan, A Aktı, S Düzgün, M Ağırnaslıgil
AIM: To assess the amount of debris extruded apically during root canal preparation using various nickel-titanium instrumentation systems. METHODOLOGY: Sixty extracted single-rooted mandibular premolar human teeth were randomly assigned to 4 groups (n = 15 teeth for each group). The canals were then instrumented with the following instrument systems: Vortex Blue (VB; Dentsply Tulsa Dental, Tulsa, OK, USA), K3XF (SybronEndo, Orange, CA, USA), Reciproc (VDW, Munich, Germany), and ProTaper Next (PTN; Dentsply Maillefer, Ballaigues, Switzerland)...
November 7, 2015: International Endodontic Journal
Priyanka Ghogre, Hemant Ramesh Chourasia, Manish Agarwal, M P Singh, Sandeep Gurav, Rahul Ghogre
AIMS: The aim of this study was to evaluate the number of intracanal bacteria extruded apically during root canal preparation using rotary ProTaper, K3XF, twisted, and hand K-file system. SUBJECTS AND METHODS: Seventy extracted single-rooted human mandibular premolar teeth were used. Access cavities were prepared and the teeth were mounted in glass vials. Root canals were then contaminated with a pure culture of Enterococcus faecalis (ATCC 29212) and incubated at 37°C for 24 h...
July 2015: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
Bernardo Corrêa de Almeida, Fabíola Ormiga, Marcos César Pimenta de Araújo, Ricardo Tadeu Lopes, Inayá Corrêa Barbosa Lima, Bernardo Camargo dos Santos, Heloisa Gusman
INTRODUCTION: The aim of this study was to make a 3-dimensional comparison of the canal transportation and changes in apical geometry using micro-computed tomographic imaging after canal preparation with K3 (SybronEndo, Orange, CA) and K3XF (SybronEndo) file systems. METHODS: Twenty-eight mandibular molars were randomly divided into 2 groups according to the rotary system used in instrumentation: K3 or K3XF. The specimens were scanned by micro-computed tomographic imaging before and after instrumentation...
December 2015: Journal of Endodontics
D Zhao, Y Shen, B Peng, M Haapasalo
AIM: To compare the cyclic fatigue resistance of HyFlex CM, Twisted Files (TF), K3XF, Race, and K3, and evaluate the effect of autoclave sterilization on the cyclic fatigue resistance of these instruments both before and after the files were cycled. METHODOLOGY: Five types of NiTi instruments with similar size 30, .06 taper were selected: HyFlex CM, TF, K3XF, Race and K3. Files were tested in a simulated canal with a curvature of 60° and a radius of 3 mm. The number of cycles to failure of each instrument was determined to evaluate cyclic fatigue resistance...
October 2016: International Endodontic Journal
Jung-Hong Ha, Sung Kyo Kim, Gary Shun-Pan Cheung, Seong Hwa Jeong, Yong Chul Bae, Hyeon-Cheol Kim
This study was aimed to evaluate the effect of torsional preloads on the cyclic fatigue life of nickel-titanium (NiTi) instruments with different history of heat treatments by manufacturers. WaveOne (Primary) made of M-wire, K3XF (#30/0.06) of R-phase, and ProTaper (F2) of conventional NiTi alloy was used. Each file was preloaded at four conditions (nil, 25, 50, and 75% of their mean ultimate torsional strength) before fatigue testing. The torsional preloads 10-, 30-, or 50-times were applied by securing 5 mm of the file tip, rotating it until the preset torque was attained before returning to the origin...
May 2015: Scanning
Ya Shen, Abdullah Mahmoud Riyahi, Les Campbell, Huimin Zhou, Tianfeng Du, Zhejun Wang, Wei Qian, Markus Haapasalo
INTRODUCTION: The purpose of this study was to evaluate the effect of various degrees of cyclic fatigue on torsional failure and torsional preloading on the cyclic fatigue life of heat-treated K3XF nickel-titanium (NiTi) instruments (SybronEndo, Orange, CA). METHODS: The mean number of cycles until failure (Nf) of K3XF and K3 NiTi instruments was examined in a 3-point bending apparatus with a 7-mm radius and 45° curve. Torque and distortion angles at failure of new instruments and instruments stressed to 25%, 50%, and 75% of the Nf were measured according to ISO 3630-1...
April 2015: Journal of Endodontics
Rajendra K Tewari, Sajid Ali, Surendra K Mishra, Ashok Kumar, Syed Mukhtar-Un-Nisar Andrabi, Asma Zoya, Sharique Alam
AIM: In the present study, the effectiveness of three rotary and two manual nickel titanium instrument systems on mechanical reduction of the intracanal Enterococcus faecalis population was evaluated. METHODS: Mandibular premolars with straight roots were selected. Teeth were decoronated and instrumented until 20 K file and irrigated with physiological saline. After sterilization by ethylene oxide gas, root canals were inoculated with Enterococcus faecalis. The specimens were randomly divided into five groups for canal instrumentation: Manual Nitiflex and Hero Shaper nickel titanium files, and rotary Hyflex CM, ProTaper Next, and K3XF nickel titanium files...
May 2016: Journal of Investigative and Clinical Dentistry
Juan Gonzalo Olivieri, Eva Stöber, Marc García Font, Jose Antonio González, Pablo Bragado, Miguel Roig, Fernando Duran-Sindreu
INTRODUCTION: The aim of the study was to compare the K3 and K3XF systems (SybronEndo, Glendora, CA) after 1 and 2 uses by evaluating apical transportation, working length loss, and working time in a manikin model. METHODS: Mesial canals of 40 extracted first mandibular molars were instrumented. Radiographs taken after instrumentation with #25, #30, #35, and #40 files were superimposed on the preoperative image in both mesiodistal and buccolingual angulations. AutoCAD (Autodesk Inc, San Rafael, CA) was used to measure working length loss and apical transportation at 0, 0...
September 2014: Journal of Endodontics
Y Shen, H Zhou, L Campbell, Z Wang, R Wang, T Du, M Haapasalo
AIM: To examine the fatigue behaviour of heat-treated NiTi instruments when immersed in aqueous media and to determine the effect of cyclic fatigue on the hardness and elastic modulus of NiTi instruments using a nanoindentation technique. METHODOLOGY: K3XF and K3 NiTi instruments, both in sizes 25, 0.04 taper and 40, 0.04 taper, were subjected to rotational bending at a curvature of 42° either in air or under deionized water, and the number of revolutions to fracture (Nf ) was recorded...
December 2014: International Endodontic Journal
Gianlucca Gambarini, Richard Gergi, Nicola Maria Grande, Nada Osta, Gianluca Plotino, Luca Testarelli
The aim of this study was to investigate whether cyclic fatigue resistance is increased for nickel titanium instruments manufactured with improved heating processes in clockwise or counterclockwise continuous rotation. The instruments compared were produced either using the R-phase heat treatment (K3XF; SybronEndo, Orange, CA, USA) or the M-wire alloy (ProFile Vortex; DENTSPLY Tulsa Dental Specialties, Tulsa, OK, USA). Tests were performed with a specific cyclic fatigue device that evaluated cycles to failure of rotary instruments in curved artificial canals...
December 2013: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
Juan José Pérez-Higueras, Ana Arias, José C de la Macorra
INTRODUCTION: New designs and alloys and different motions have been introduced to increase the cyclic fatigue (CF) resistance of nickel-titanium (NiTi) files. The aim of this study was to compare the CF resistance of K3 (SybronEndo, Orange, CA), K3XF (SybronEndo), and TF (SybronEndo) files under continuous rotation and reciprocating motion. METHODS: A total of 210 files (30-tip diameter, 0.06 fixed taper), 60 K3, 60 K3XF, and 90 TF files, were divided into 7 groups (30 files each): K3-C, K3XF-C, and TF1-C were rotated at 300 rpm; TF2-C was rotated at 500 rpm; and K3-R, K3XF-R, and TF1-R were used in a reciprocating motion...
December 2013: Journal of Endodontics
Ya Shen, Hui-Min Zhou, Zhejun Wang, Les Campbell, Yu-feng Zheng, Markus Haapasalo
INTRODUCTION: The bending and torsional properties of thermomechanically treated K3XF (SybronEndo, Orange, CA) nickel-titanium instruments in relation to their phase transformation behavior were evaluated. METHODS: NiTi instruments K3 (SybronEndo) and K3XF, both in sizes 25/.04 and 40/.04, were examined by differential scanning calorimetry and X-ray diffraction. The metal composition was determined by scanning electron microscopy with X-ray energy-dispersive spectrometric analyses...
July 2013: Journal of Endodontics
Jung-Hong Ha, Sung Kyo Kim, Nestor Cohenca, Hyeon-Cheol Kim
INTRODUCTION: The purpose of this study was to investigate whether the resistance to torsional stress and cyclic fatigue would be improved by the novel R-phase heat treatment by using instruments with identical geometric characteristics. METHODS: K3XF and K3 files with sizes of #30/.04 and #30/.06 were selected for the study (n = 10 per group). To evaluate the torsional resistance, the torsional load and distortion angle at yield, ultimate, and fracture points were recorded...
March 2013: Journal of Endodontics
Gianluca Gambarini, Alessio Giansiracusa Rubini, Dina Al Sudani, Richard Gergi, Antonio Culla, Francesca De Angelis, Stefano Di Carlo, Giorgio Pompa, Nada Osta, Luca Testarelli
INTRODUCTION: The purpose of this study was to evaluate cyclic fatigue fracture resistance of engine-driven nickel-titanium (K3XF) instruments under reciprocating movement in various angles. METHODS: Fifty K3XF size 40 taper 0.06 nickel-titanium instruments were divided randomly into 5 groups of 10 each. All instruments were subjected to cyclic fatigue tests. Instruments in groups 1-4 were tested by using different reciprocating motions, whereas instruments of group 5 (control group) were used in continuous rotation...
October 2012: Journal of Endodontics
Gianluca Plotino, Alberto Costanzo, Nicola M Grande, Renata Petrovic, Luca Testarelli, Gianluca Gambarini
INTRODUCTION: The purpose of this study was to evaluate the effect of autoclave sterilization on cyclic fatigue resistance of rotary endodontic instruments made of traditional and new nickel-titanium (NiTi) alloys. METHODS: Four NiTi rotary endodontic instruments of the same size (tip diameter 0.40 mm and constant .04 taper) were selected: K3, Mtwo, Vortex, and K3 XF prototypes. Each group was then divided into 2 subgroups, unsterilized instruments and sterilized instruments...
February 2012: Journal of Endodontics
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