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https://www.readbyqxmd.com/read/27847752/screw-in-forces-during-instrumentation-by-various-file-systems
#1
Jung-Hong Ha, Sang Won Kwak, Sung-Kyo Kim, Hyeon-Cheol Kim
OBJECTIVES: The purpose of this study was to compare the maximum screw-in forces generated during the movement of various Nickel-Titanium (NiTi) file systems. MATERIALS AND METHODS: Forty simulated canals in resin blocks were randomly divided into 4 groups for the following instruments: Mtwo size 25/0.07 (MTW, VDW GmbH), Reciproc R25 (RPR, VDW GmbH), ProTaper Universal F2 (PTU, Dentsply Maillefer), and ProTaper Next X2 (PTN, Dentsply Maillefer, n = 10). All the artificial canals were prepared to obtain a standardized lumen by using ProTaper Universal F1...
November 2016: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/27763503/debris-evaluation-after-root-canal-shaping-with-rotating-and-reciprocating-single-file-systems
#2
Alberto Dagna, Giulia Gastaldo, Riccardo Beltrami, Claudio Poggio
This study evaluated the root canal dentine surface by scanning electron microscope (SEM) after shaping with two reciprocating single-file NiTi systems and two rotating single-file NiTi systems, in order to verify the presence/absence of the smear layer and the presence/absence of open tubules along the walls of each sample; Forty-eight single-rooted teeth were divided into four groups and shaped with OneShape (OS), F6 SkyTaper (F6), WaveOne (WO) and Reciproc and irrigated using 5.25% NaOCl and 17% EDTA. Root canal walls were analyzed by SEM at a standard magnification of 2500×...
October 17, 2016: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/27508158/preference-of-undergraduate-students-after-first-experience-on-nickel-titanium-endodontic-instruments
#3
Sang Won Kwak, Gary Shun-Pan Cheung, Jung-Hong Ha, Sung Kyo Kim, Hyojin Lee, Hyeon-Cheol Kim
OBJECTIVES: This study aimed to compare two nickel-titanium systems (rotary vs. reciprocating) for their acceptance by undergraduate students who experienced nickel-titanium (NiTi) instruments for the first time. MATERIALS AND METHODS: Eighty-one sophomore dental students were first taught on manual root canal preparation with stainless-steel files. After that, they were instructed on the use of ProTaper Universal system (PTU, Dentsply Maillefer), then the WaveOne (WO, Dentsply Maillefer)...
August 2016: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/27502895/fracture-resistance-of-dental-nickel-titanium-rotary-instruments-with-novel-surface-treatment-thin-film-metallic-glass-coating
#4
Chih-Wen Chi, Yu-Lun Deng, Jyh-Wei Lee, Chun-Pin Lin
BACKGROUND/PURPOSE: Dental nickel-titanium (NiTi) rotary instruments are widely used in endodontic therapy because they are efficient with a higher success rate. However, an unpredictable fracture of instruments may happen due to the surface characteristics of imperfection (or irregularity). This study assessed whether a novel surface treatment could increase fatigue fracture resistance of dental NiTi rotary instruments. METHODS: A 200- or 500-nm thick Ti-zirconium-boron (Ti-Zr-B) thin film metallic glass was deposited on ProTaper Universal F2 files using a physical vapor deposition process...
August 5, 2016: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/26876735/shaping-ability-of-two-nickel-titanium-instruments-activated-by-continuous-rotation-or-adaptive-motion-a-micro-computed-tomography-study
#5
E Pedullà, G Plotino, N M Grande, G Avarotti, G Gambarini, E Rapisarda, F Mannocci
OBJECTIVES: The objective of the study was to evaluate the shaping ability of curved root canals using Twisted File Adaptive (TFA) files (SybronEndo, Orange, CA) and Mtwo (Sweden & Martina, Padova, Italy) activated by continuous rotation or adaptive motion. MATERIALS AND METHODS: Thirty-two mandibular molars with two separate mesial canals and severe angles of curvature were selected. Each canal was randomly assigned to one of the four experimental groups (n = 16): TFA and Mtwo files used in continuous rotation (groups 1 and 3) or in adaptive motion (groups 2 and 4)...
February 15, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/26581466/nickel-titanium-single-file-system-in-endodontics
#6
Alberto Dagna
AIM: This work describes clinical cases treated with a innovative single-use and single-file nickel-titanium (NiTi) system used in continuous rotation. BACKGROUND: Nickel-titanium files are commonly used for root canal treatment but they tend to break because of bending stresses and torsional stresses. Today new instruments used only for one treatment have been introduced. They help the clinician to make the root canal shaping easier and safer because they do not require sterilization and after use have to be discarded...
October 2015: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/26514866/current-assessment-of-reciprocation-in-endodontic-preparation-a-comprehensive-review-part-i-historic-perspectives-and-current-applications
#7
REVIEW
Nicola Maria Grande, Hany Mohamed Aly Ahmed, Stephen Cohen, Frédéric Bukiet, Gianluca Plotino
INTRODUCTION: During the evolution of mechanical instrumentation in endodontics, an important role has been played by reciprocating stainless steel files using horizontal rotational, vertical translational, or combined movements. These kinds of systems are still in use mainly as an accessory to help in the first phases of the treatment. METHODS: The literature concerning these systems has been analyzed using selected criteria. RESULTS: The latest evolution of horizontal rotational reciprocating movement brought to the development of a different kind of movement in which the angles are asymmetrical and that appears to be ideal in conjunction with modern nickel-titanium (NiTi) files with a greater taper...
November 2015: Journal of Endodontics
https://www.readbyqxmd.com/read/26349291/molar-intrusion-in-open-bite-adults-using-zygomatic-miniplates
#8
COMPARATIVE STUDY
Eiman S Marzouk, Essam Mohamed Abdallah, Walid A El-Kenany
The aim of this study is to evaluate the skeletal, dental and soft tissue changes that arise after intrusion of the maxillary molars using zygomatic miniplates in adult skeletal anterior open bite patients. In addition to measuring the amount and rate of molar intrusion; with special emphasis on changes in the axial inclination of the intruded molars. The study group was composed of 13 anterior open bite patients (mean age 18 years, 8 months ± 2 years, 2 months) with posterior dentoalveolar excess. Mini-plates were placed in the zygomatic buttress bilaterally...
2015: International Journal of Orthodontics
https://www.readbyqxmd.com/read/26296811/performance-of-niti-endodontic-instrument-under-different-temperatures
#9
Ahmed Jamleh, Yoshio Yahata, Arata Ebihara, Amre R Atmeh, Turki Bakhsh, Hideaki Suda
The purpose of this study was to test nickel titanium (NiTi) instrument performance under different surrounding temperatures. Twenty-four superelastic NiTi instruments with a conical shape comprising a 0.30-mm-diameter tip and 0.06 taper were equally divided into 3 groups according to the temperature employed. Using a specially designed cyclic fatigue testing apparatus, each instrument was deflected to give a curvature 10 mm in radius and a 30° angle. This position was kept as the instrument was immersed in a continuous flow of water under a temperature of 10, 37, or 50 °C for 20 s to calculate the deflecting load (DL)...
September 2016: Odontology
https://www.readbyqxmd.com/read/26101041/comparative-evaluation-of-cyclic-fatigue-resistance-of-d-race-and-protaper-retreatment-instruments-in-curved-artificial-canals
#10
H S Topçuoğlu, G Topçuoğlu, A Aktı
AIM: To compare the cyclic fatigue resistance of D-RaCe and ProTaper rotary nickel-titanium (NiTi) retreatment files when used in curved artificial canals. METHODOLOGY: A total of 120 new D-RaCe DR2 and ProTaper D3 retreatment files were tested in stainless steel artificial canals having 45° and 60° angles of curvature. Thirty instruments of each of the file systems were tested in both angles of curvature (n = 30). The retreatment instruments were rotated until fracture to calculate the number of cycles to failure...
June 2016: International Endodontic Journal
https://www.readbyqxmd.com/read/25744092/effect-of-archwire-qualities-and-bracket-designs-on-the-force-systems-during-leveling-of-malaligned-teeth
#11
COMPARATIVE STUDY
W Perrey, A Konermann, L Keilig, S Reimann, A Jäger, C Bourauel
OBJECTIVES: The force systems during multiband treatment are influenced by the selection of the bracket-archwire combinations. Resin models replicated from casts reflecting the pretreatment intraoral situation of a patient's mandible were used to explore how different bracket systems and archwire qualities would affect the force systems developing during simulated orthodontic leveling of several malaligned teeth. MATERIALS AND METHODS: Leveling movements of the malaligned teeth 32, 33, and 34 were simulated using the orthodontic measurement and simulation system (OMSS)...
March 2015: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/25684433/elastic-limits-in-torsion-of-reciprocating-nickel-titanium-instruments
#12
Jung-Hong Ha, Seo-Ryeong Kim, Antheunis Versluis, Gary Shun-Pan Cheung, Jin-Woon Kim, Hyeon-Cheol Kim
INTRODUCTION: Reciprocating angle and torsional load at the superelastic limit were investigated for nickel-titanium (NiTi) instruments used with reciprocating movements. METHODS: Two reciprocating NiTi instruments (Reciproc R25 [VDW, Munich, Germany] and WaveOne Primary [Dentsply Maillefer, Ballaigues, Switzerland]) and ProTaper F2 (Dentsply Maillefer) were tested for 2 torsional conditions using a custom-designed testing device. Rotational angles were applied, and generated torque values were recorded...
May 2015: Journal of Endodontics
https://www.readbyqxmd.com/read/25676195/effect-of-alloy-type-on-the-life-time-of-torsion-preloaded-nickel-titanium-endodontic-instruments
#13
COMPARATIVE STUDY
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
https://www.readbyqxmd.com/read/25459570/effect-of-a-combination-of-torsional-and-cyclic-fatigue-preloading-on-the-fracture-behavior-of-k3-and-k3xf-instruments
#14
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
https://www.readbyqxmd.com/read/25433447/cutting-efficiency-of-nickel-titanium-rotary-and-reciprocating-instruments-after-prolonged-use
#15
Gianluca Gambarini, Alessio Giansiracusa Rubini, Giampaolo Sannino, Gianni Di Giorgio, Fabrizio Di Giorgio, Lucila Piasecki, Dina Al-Sudani, Gianluca Plotino, Luca Testarelli
The aim of the present study was to compare the cutting efficiency of Twisted File instruments used in continuous rotation or TF Adaptive motion and evaluate if prolonged use significantly affected their cutting ability. 20 new NiTi instruments were used in the present study (TF tip size 35, 0.06 taper; Sybron-Endo, Orange, CA, USA), divided into 2 subgroups of 10 instruments each, depending on which movement was selected on the endodontic motor. Group 1: TF instruments were activated using the program TF continuous rotation at 500 rpm and torque set at 2 N; Group 2: TF instruments were activated using the reciprocating TF Adaptive motion...
January 2016: Odontology
https://www.readbyqxmd.com/read/25266920/evaluation-of-the-mechanical-behaviour-of-pathfile-and-proglider-pathfinding-nickel-titanium-rotary-instruments
#16
A M Elnaghy, S E Elsaka
AIM: To assess and compare the resistance to cyclic fatigue, torsional stress, bending and buckling of ProGlider (PG; Dentsply Maillefer, Ballaigues, Switzerland) instruments with PathFile (PF; Dentsply Maillefer) pathfinding nickel-titanium rotary instruments. METHODOLOGY: Size 16, .02 taper PG and PF instruments were rotated in simulated canals until failure, and the number of cycles to failure (NCF) was recorded to evaluate their cyclic fatigue resistance. Torsional strength was measured using a torsiometer after fixing rigidly the apical 5 mm of the instrument...
September 2015: International Endodontic Journal
https://www.readbyqxmd.com/read/24935551/cyclic-fatigue-resistance-of-race-and-mtwo-rotary-files-in-continuous-rotation-and-reciprocating-motion
#17
COMPARATIVE STUDY
Sekar Vadhana, Balasubramanian SaravanaKarthikeyan, Suresh Nandini, Natanasabapathy Velmurugan
INTRODUCTION: The purpose of this study was to evaluate and compare the cyclic fatigue resistance of RaCe (FKG Dentaire, La Chaux-de-Fonds, Switzerland) and Mtwo (VDW, Munich, Germany) rotary files in continuous rotation and reciprocating motion. METHODS: A total of 60 new rotary Mtwo and RaCe files (ISO size = 25, taper = 0.06, length = 25 mm) were selected and randomly divided into 4 groups (n = 15 each): Mtc (Mtwo NiTi files in continuous rotation), Rc (RaCe NiTi files in continuous rotation), Mtr (Mtwo NiTi files in reciprocating motion), and Rr (RaCe NiTi files in reciprocating motion)...
July 2014: Journal of Endodontics
https://www.readbyqxmd.com/read/24910660/evaluation-of-two-new-electronic-apex-locator-controlled-handpieces-using-a-niti-rotary-file-an-in-vitro-study
#18
Kiumarz Nazarimoghadam, Hossein Labaf
OBJECTIVES: The aim of this in-vitro study was to compare the accuracy of two new electronic apex-locator controlled handpieces (EALHs) using the first rotary Mtwo file while rotating in the canal. MATERIALS AND METHODS: A total of 36 extracted mandibular molar teeth were selected. The lengths of the mesio-buccal canals to the major foramina were measured directly using a size 10 K-file introduced in the canal until the tip was visible under a loupe and then 0.5 mm was subtracted from the recorded lengths as the actual working lengths (AWLs)...
November 2013: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/24798116/the-effect-of-electrical-treatment-on-cyclic-fatigue-of-niti-instruments
#19
Mohammad Ali Saghiri, Armen Asatourian, Franklin Garcia-Godoy, James L Gutmann, Mehrdad Lotfi, Nader Sheibani
Dentists desire to use NiTi rotary instruments, which do not break inside the root canals of teeth, since the pieces from broken files are difficult to remove. The NiTi rotary instrument breakage is because of cyclic and torsional fatigue. Here the low-voltage (12 V) and high voltage (24 V) electrical treatments were used to enhance the cyclic fatigue of NiTi rotary instruments and increase their durability. In excremental groups, following electrical treatment samples of the NiTi instruments were rotated inside artificial root canals until they broke...
September 2014: Scanning
https://www.readbyqxmd.com/read/24717063/effects-of-three-nickel-titanium-instrument-systems-on-root-canal-geometry-assessed-by-micro-computed-tomography
#20
R Gergi, N Osta, G Bourbouze, C Zgheib, R Arbab-Chirani, A Naaman
AIM: To compare and evaluate the shaping ability of several nickel titanium instrument systems with different motions: two reciprocating single-file systems (Reciproc and WaveOne) and one continuous rotation/reciprocation full-sequence system [Twisted File (TF) Adaptive] using micro-computed tomography. METHODOLOGY: A total of forty-eight mesial canals of mandibular molars with two separate root canals and severe angles of curvature were selected. Canals were divided randomly to one of three experimental groups: group 1, reciprocating instrumentation with Reciproc R25, group 2, reciprocating with the Primary WaveOne file and group 3 'Adaptive Rotary Motion' with Twisted Files...
February 2015: International Endodontic Journal
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