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Comparison of the cyclic fatigue resistance of VDW.ROTATE, TruNatomy, 2Shape, and HyFlex CM nickel-titanium rotary files at body temperature
Mustafa Gündoğar, Gülşah Uslu, Taha Özyürek, Gianluca Plotino
Restor Dent Endod 2020;45(3):e37.   Published online June 22, 2020
DOI: https://doi.org/10.5395/rde.2020.45.e37
AbstractAbstract PDFPubReaderePub
Objectives

This study aims to compare the cyclic fatigue resistance of VDW.ROTATE, TruNatomy, 2Shape, and HyFlex CM nickel-titanium (NiTi) rotary files at body temperature.

Materials and Methods

In total, 80 VDW.ROTATE (25/0.04), TruNatomy (26/0.04), 2Shape (25/0.04), and HyFlex CM (25/0.04) NiTi rotary files (n = 20 in each group) were subjected to static cyclic fatigue testing at body temperature (37°C) in stainless-steel artificial canals prepared according to the size and taper of the instruments until fracture occurred. The number of cycles to fracture (NCF) was calculated, and the lengths of the fractured fragments were measured. The data were statistically analyzed using a 1-way analysis of variance and post hoc Tamhane tests at the 5% significance level (p < 0.05).

Results

There were significant differences in the cyclic fatigue resistance among the groups (p < 0.05), with the highest to lowest NCF values of the files as follows: VDW.ROTATE, HyFlex CM, 2Shape, and TruNatomy. There was no significant difference in the lengths of the fractured fragments among the groups. The scanning electron microscope images of the files revealed typical characteristics of fracture due to cyclic fatigue.

Conclusions

The VDW.ROTATE files had the highest cyclic fatigue resistance, and the TruNatomy and 2Shape files had the lowest cyclic fatigue resistance in artificial canals at body temperature.

Citations

Citations to this article as recorded by  
  • Comparative Evaluation of Efficiency of Different Endodontic File Systems; Protaper Universal, MTWO, Protaper Next, Trunatomy, I-Race in Terms of Remaining Dentin Thickness: An In vitro CBCT Analysis
    Anju Retnakaran, Faisal M. A. Gaffoor, Rethi Gopakumar, C Sabari Girish, N. C Sajeena, N Gokul Krishna
    Journal of Pharmacy and Bioallied Sciences.2024; 16(Suppl 2): S1409.     CrossRef
  • Analysis of Cutting Capacity, Surface Finishing, and Mechanical Properties of NiTi Instruments 25/.04: ROTATE and LOGIC 2
    Ridalton Carlos de Morais, Juliana Delatorre Bronzato, Adriana de-Jesus-Soares, Marcos Frozoni, Victor Talarico Leal Vieira
    Journal of Endodontics.2024; 50(7): 982.     CrossRef
  • Effect of Temperature on the Cyclic Fatigue Resistance and Phase Transformation Behavior of Three Different NiTi Endodontic Instruments
    Esra İrem Yi̇ği̇t, İrem Çetinkaya
    Cureus.2024;[Epub]     CrossRef
  • In Vitro Evaluation of the Dynamic Cyclic Fatigue Resistance of a New TruNatomy Glider File after Different Cycles of Use
    Lorena Ferreira Rego, Juliana Delatorre Bronzato, Alana Pinto Carôso Souza, Adriana de-Jesus-Soares, Marcos Frozoni
    Journal of Endodontics.2024; 50(5): 619.     CrossRef
  • Effect of Sodium Hypochlorite and Hypochlorous Acid Solutions on the Cyclic Fatigue Resistance of Waveonegold, K3XF and Hyflex-EDM: A Study of Metallurgical Properties
    D. A. Bozkurt, M. Akman, H. B. Karadag, Z. Ovalioglu, Ö.Küçük Keleş
    Strength of Materials.2023; 55(1): 191.     CrossRef
  • Effectiveness of conservative instrumentation in root canal disinfection
    Sıla Nur Usta, Carmen Solana, Matilde Ruiz-Linares, Pilar Baca, Carmen María Ferrer-Luque, Monica Cabeo, Maria Teresa Arias-Moliz
    Clinical Oral Investigations.2023; 27(6): 3181.     CrossRef
  • Cyclic fatigue resistance of different nickel‐titanium instruments in single and double curvature at room and body temperatures: A laboratory study
    Giusy Rita Maria La Rosa, Maria Laura Leotta, Francesco Saverio Canova, Virginia Rosy Romeo, Gabriele Cervino, Luigi Generali, Eugenio Pedullà
    Australian Endodontic Journal.2023; 49(3): 592.     CrossRef
  • Influence of NiTi Wire Diameter on Cyclic and Torsional Fatigue Resistance of Different Heat-Treated Endodontic Instruments
    Eugenio Pedullà, Francesco Saverio Canova, Giusy Rita Maria La Rosa, Alfred Naaman, Franck Diemer, Luigi Generali, Walid Nehme
    Materials.2022; 15(19): 6568.     CrossRef
  • Impact of Different Access Cavity Designs and Ni–Ti Files on the Elimination of Enterococcus faecalis from the Root Canal System: An In Vitro Study
    Gizem Andac, Atakan Kalender, Buket Baddal, Fatma Basmaci
    Applied Sciences.2022; 12(4): 2049.     CrossRef
  • Comparison of canal transportations and centering ability of rotary instrument systems with different heat-treated NiTi alloys: An in vitro CBCT study
    Mukadder İnci BAŞER KOLCU, Gülter Devrim KAKİ
    Turkish Journal of Health Science and Life.2022; 5(2): 81.     CrossRef
  • Comparative evaluation of cutting efficiency, cyclic fatigue, corrosion resistance, and autoclave cycle effects of three different file systems: An in-vitro micro-CT and metallurgy analysis
    KondasV Venkatesh, EldhoJ Varghese
    Journal of International Oral Health.2022; 14(6): 551.     CrossRef
  • Influence of different heat treatments and temperatures on the cyclic fatigue resistance of endodontic instruments with the same design
    Walid Nehme, Alfred Naaman, Franck Diemer, Maria Laura Leotta, Giusy Rita Maria La Rosa, Eugenio Pedullà
    Clinical Oral Investigations.2022; 27(4): 1793.     CrossRef
  • Analysis of cyclic fatigue resistance of ProTaper Universal and ProTaper Next rotary instruments
    Nenad Stosic, Jelena Popovic, Marija Andjelkovic-Apostolovic, Aleksandar Mitic, Radomir Barac, Marija Nikolic, Marko Igic
    Stomatoloski glasnik Srbije.2022; 69(3): 109.     CrossRef
  • Influência do hipoclorito de sódio na resistência à fadiga cíclica em instrumentos rotatórios endodônticos de memória controlada de NiTi: uma avaliação experimental
    Marcelo Leite MESQUITA, Carlos Eduardo da Silveira BUENO, Alexandre Sigrist DE MARTIN, Rina Andrea PELEGRINE, Carlos Eduardo FONTANA
    Revista de Odontologia da UNESP.2022;[Epub]     CrossRef
  • Comparison of Cyclic Fatigue Resistance of Novel TruNatomy Files with Conventional Endodontic Files: An In Vitro SEM Study
    Sabari Murugesan, Vinoth Kumar, Bharath Naga Reddy, Syed Nahid Basheer, Rajeswary Kumar, Saravanan Selvaraj
    The Journal of Contemporary Dental Practice.2022; 22(11): 1243.     CrossRef
  • Cyclic Fatigue of TruNatomy Nickel-Titanium Rotary Instrument in Single and Double Curvature Canals: A Comparative Study
    Sarah A Rashid, Hikmet A AI-Gharrawi
    World Journal of Dentistry.2021; 12(1): 28.     CrossRef
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  • 16 Crossref
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Influence of autoclave sterilization procedures on the cyclic fatigue resistance of heat-treated nickel-titanium instruments: a systematic review
Emmanuel João Nogueira Leal Silva, Mayara Zanon, Fernanda Hecksher, Felipe Gonçalves Belladonna, Rafaela Andrade de Vasconcelos, Tatiana Kelly da Silva Fidalgo
Restor Dent Endod 2020;45(2):e25.   Published online March 31, 2020
DOI: https://doi.org/10.5395/rde.2020.45.e25
AbstractAbstract PDFPubReaderePub
Objectives

This systematic review evaluated the influence of autoclave sterilization procedures on the cyclic fatigue resistance of heat-treated nickel-titanium (NiTi) instruments.

Materials and Methods

A systematic search without restrictions was conducted in the following electronic databases: PubMed, Scopus, Web of Science, ScienceDirect, Cochrane, and Open Grey. The hand search was also performed in the main endodontic journals. The eligible studies were submitted to the methodological assessment and data extraction.

Results

From 203 abstracts, a total of 10 articles matched the eligible criteria. After reading the full articles, 2 were excluded because of the absence of the heat-treated instruments in the experimental design and 3 due to the lack of a control group using heat-treated instruments without autoclave sterilization. From the 5 included studies, 1 presented a low risk of bias, 3 presented moderate and 1 high risk. It was observed heterogeneous findings in the included studies, with autoclave sterilization cycles increasing, decreasing or not affecting the cyclic fatigue life of heat-treated NiTi instruments. However, the retrieved studies evaluating the cyclic fatigue resistance of endodontic instruments presented different protocols and assessing outcomes, this variability makes the findings less comparable within and also between groups and preclude the establishment of an unbiased scientific evidence base.

Conclusions

Considering the little scientific evidence and considerable risk of bias, it is still possible to conclude that autoclave sterilization procedures appear to influence the cyclic fatigue resistance of heat-treated NiTi instruments.

Citations

Citations to this article as recorded by  
  • Effect of simulated clinical use and sterilization on the cyclic fatigue resistance of nickel titanium files
    Mohammad Alajemi, Ammar AbuMostafa
    PeerJ.2024; 12: e17418.     CrossRef
  • Cyclic Fatigue of Different Ni-Ti Endodontic Rotary File Alloys: A Comprehensive Review
    Dina Abdellatif, Alfredo Iandolo, Michela Scorziello, Giuseppe Sangiovanni, Massimo Pisano
    Bioengineering.2024; 11(5): 499.     CrossRef
  • Cyclic Fatigue Resistance of Rotary versus Reciprocating Endodontic Files: A Systematic Review and Meta-Analysis
    Ana De Pedro-Muñoz, Cristina Rico-Romano, Patricia Sánchez-Llobet, José María Montiel-Company, Jesús Mena-Álvarez
    Journal of Clinical Medicine.2024; 13(3): 882.     CrossRef
  • Influence of sodium hypochlorite on cyclic fatigue resistance of nickel–titanium instruments: A systematic review and meta-analysis of in vitro studies
    Alexandre Henrique dos Reis-Prado, Lucas Guimarães Abreu, Lara Cancella de Arantes, Kiani dos Santos de Paula, Sabrina de Castro Oliveira, Juliana Goto, Ana Cecília Diniz Viana, Francine Benetti
    Clinical Oral Investigations.2023; 27(11): 6291.     CrossRef
  • Cyclic fatigue resistance of EdgeTaper Platinum, Protaper Gold, and TruNatomy Prime rotary files before and after autoclave sterilization
    Rahaf A. Almohareb, Reem M. Barakat, Fahda N. Algahtani, Manal F. Alkadi
    PeerJ.2023; 11: e14656.     CrossRef
  • Effect of calcium hydroxide on fracture resistance and microhardness of dentin in human teeth
    Simar Sethi, Alpa Gupta, Ansy Hanna Kurian, Dax Abraham, Parul Chauhan, Kritika Aneja, Sucheta Jala, Arundeep Singh
    Endodontology.2022; 34(4): 223.     CrossRef
  • Effect of body temperature on the cyclic fatigue resistance of the nickel”titanium endodontic instruments: A systematic review and meta-analysis of in vitro studies
    Selventhra Savitha, Sidhartha Sharma, Vijay Kumar, Amrita Chawla, Perumal Vanamail, Ajay Logani
    Journal of Conservative Dentistry.2022; 25(4): 338.     CrossRef
  • Fracture Resistance of Heat-Treated Nickel-Titanium Rotary Files After Usage and Autoclave Sterilization: An In Vitro Study
    Rashid El Abed, Aisha Alshehhi, Yoo Jung Kang, Dana Al Raeesi, Amar H. Khamis, Mohamed Jamal, Hyeon-Cheol Kim
    Journal of Endodontics.2022; 48(11): 1428.     CrossRef
  • Effect of Autoclaving Cycles on the Cyclic Fatigue Resistance of Race and Race Evo Nickel-Titanium Endodontic Rotary Files: An In Vitro Study
    Rahaf A. Almohareb, Reem Barakat, Aroob Albakri, Manal Altamimi
    Metals.2021; 11(12): 1947.     CrossRef
  • Effect of number of uses and sterilization on the instrumented area and resistance of reciprocating instruments
    Victor de Ornelas Peraça, Samantha Rodrigues Xavier, Fabio de Almeida Gomes, Luciane Geanini Pena dos Santos, Erick Miranda Souza, Fernanda Geraldo Pappen
    Restorative Dentistry & Endodontics.2021;[Epub]     CrossRef
  • Influence of sterilization procedures on the physical and mechanical properties of rotating endodontic instruments: a systematic review and network meta-analysis
    Mario Dioguardi, Claudia Arena, Diego Sovereto, Riccardo Aiuto, Luigi Laino, Gaetano Illuzzi, Enrica Laneve, Bruna Raddato, Vito Carlo Alberto Caponio, Antonio Dioguardi, Khrystyna Zhurakivska, Giuseppe Troiano, Lorenzo Lo Muzio
    Frontiers in Bioscience-Landmark.2021;[Epub]     CrossRef
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  • 11 Crossref
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An in vitro evaluation of the accuracy of four electronic apex locators using stainless-steel and nickel-titanium hand files
Paras Mull Gehlot, Vinutha Manjunath, Mysore Krishnaswamy Manjunath
Restor Dent Endod 2016;41(1):6-11.   Published online January 4, 2016
DOI: https://doi.org/10.5395/rde.2016.41.1.6
AbstractAbstract PDFPubReaderePub
Objectives

The purpose of this in vitro study was to evaluate the accuracy of working length (WL) determination of four electronic apex locators (EALs), namely, Root ZX (RZX), Elements diagnostic unit and apex locator (ELE), SybronEndo Mini Apex locator (MINI) and Propex pixi (PIXI) using Stainless steel (SS) and nickel-titanium (NiTi) hand files. The null hypothesis was that there was no difference between canal length determination by SS and NiTi files of 4 EALs.

Materials and Methods

Sixty extracted, single rooted human teeth were decoronated and the canal orifice flared. The actual length (AL) was assessed visually, and the teeth were embedded in an alginate model. The electronic length (EL) measurements were recorded with all four EALs using SS and NiTi files at '0.5' reading on display. The differences between the AL and EL were compared.

Results

The results obtained with each EAL with SS and NiTi files were compared with AL. A paired sample t test showed that there was a statistical significant difference between EAL readings with SS and NiTi files for RZX and MINI (p < 0.05). The accuracy of RZX, ELE, MINI and PIXI within ± 0.5 mm of AL with SS/NiTi files were 93.3%/70%, 90%/91.7%, 95%/68.3%, and 83.3%/83.3%, respectively.

Conclusions

The results of this study indicate that Root ZX was statistically more accurate with NiTi files compared to SS files, while MINI was statistically more accurate with SS files compared to NiTi files. ELE and PIXI were not affected by the alloy type of the file used to determine WL.

Citations

Citations to this article as recorded by  
  • Accuracy of electronic apex locators using heat‐treatedNi‐Tifile
    Kang‐Young Heo, Ho‐Keel Hwang, Hyoung‐Hoon Jo
    Australian Endodontic Journal.2023; 49(1): 111.     CrossRef
  • Impact of nickel-titanium instrument heat treatment on the precision of an inbuilt electronic apex locator and endodontic motor
    Syed Manzoor Ul Haq Bukhari, Rahil Bhat, Sheeeban Rashid
    IP Indian Journal of Conservative and Endodontics.2023; 8(3): 155.     CrossRef
  • Clinical Accuracy and Precision of 3 Multifrequency Electronic Apex Locators Assessed through Micro–Computed Tomographic Imaging
    Gustavo De-Deus, Viviany Cozer, Erick Miranda Souza, Emmanuel João Nogueira Leal Silva, Felipe Gonçalves Belladonna, Marco Simões-Carvalho, Marco Aurélio Versiani
    Journal of Endodontics.2023; 49(5): 487.     CrossRef
  • Influence of heat treatment of nickel–titanium instruments on the accuracy of an electronic apex locator integrated with endodontic motor
    HermanoCamelo Paiva, Eduardo Akisue, GeorgeTáccio de Miranda Candeiro, Iandarade Lima Scardini, CelsoLuiz Caldeira, Giulio Gavini
    Journal of Conservative Dentistry.2022; 25(6): 596.     CrossRef
  • The accuracy of electronic apex locators for determining working length: An in vitro study with artificial teeth
    Raquel C. F. D. Bernardo, Louise S. Alves, Adilia M. V. Bruno, Thais M. C. Coutinho, Heloisa Gusman
    Australian Endodontic Journal.2021; 47(2): 217.     CrossRef
  • LİTERATÜRDE IN VITRO ELEKTRONİK APEKS BULUCU ÇALIŞMALARINDA KULLANILAN ORTAM ÇEŞİTLERİ: BİR DERLEME
    Hamza CUDAL, Tuğrul ASLAN, Yakup ÜSTÜN
    Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi.2021; : 454.     CrossRef
  • Effect of solvent use on postoperative pain in root canal retreatment: a randomized, controlled clinical trial
    Ozgur Genc Sen, Ali Erdemir, Burhan Can Canakci
    Clinical Oral Investigations.2020; 24(1): 257.     CrossRef
  • A clinical evaluation of two electronic apex locators and conventional radiography in working length determination in primary molar and its influence on children's behavioral responses
    Krithi Nellamakkada, SandyaS Patil, Madhu Kakanur, RaviS Kumar, Rachna Thakur
    Journal of Indian Society of Pedodontics and Preventive Dentistry.2020; 38(2): 158.     CrossRef
  • Comparison of the accuracies of multi-frequency electronic apex locators in teeth with enlarged apical foramina: ex vivo
    Mügem Aslı Ekici, Bağdagül Helvacıoğlu Kıvanç, Adil Ekici
    Acta Odontologica Turcica.2017;[Epub]     CrossRef
  • Root ZX Electronic Foramen Locator: An Ex Vivo Study of Its Three Models’ Precision and Reproducibility
    Bernardo Almeida Aguiar, Rafael Santos Reinaldo, Luciana Maria Arcanjo Frota, Mônica Sampaio do Vale, Bruno Carvalho de Vasconcelos
    International Journal of Dentistry.2017; 2017: 1.     CrossRef
  • Determination of the Accuracy of 5 Electronic Apex Locators in the Function of Different Employment Protocols
    Tiago Nepomuceno Oliveira, Nilton Vivacqua-Gomes, Ricardo Affonso Bernardes, Rodrigo Ricci Vivan, Marco Antonio Hungaro Duarte, Bruno Carvalho Vasconcelos
    Journal of Endodontics.2017; 43(10): 1663.     CrossRef
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  • 11 Crossref
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A comparison of the shaping ability of reciprocating NiTi instruments in simulated curved canals
Young-Sil Yoo, Yong-Bum Cho
Restor Dent Endod 2012;37(4):220-227.   Published online November 21, 2012
DOI: https://doi.org/10.5395/rde.2012.37.4.220
AbstractAbstract PDFPubReaderePub
Objectives

The study was to compare the shaping ability of Reciproc (VDW) and WaveOne (Dentsply Maillefer) instruments compared with ProTaper, Profile and hand instrument during the preparation of simulated root canals.

Materials and Methods

Five groups (n = 5) were established. Reciproc, WaveOne, ProTaper, Profile and K file (K-flexo file) were used to prepare the resin simulated canals. A series of preoperative and postoperative images were taken by a microscope and superimposed in 2 different layers. The amount of resin removed from both the inner and the outer sides of the canal was measured to the level of 10 mm from the apical tip, with a 1 mm increment.

Results

The mean of resin removal from the inner canal wall was not different from the outer canal wall for Reciproc and WaveOne groups at apical third (1 - 3 mm level). There was no difference in the change of working length and maintenance of canal curvature. NiTi instruments are superior to stainless-steel K file in their shaping ability.

Conclusions

Within the limitation of this present study, Reciproc and WaveOne instruments maintained the original canal curvature in curved canals better than ProTaper and Profile, which tend to transport towards the outer canal wall of the curve in the apical part of the canal.

Citations

Citations to this article as recorded by  
  • Comparative Analysis of NiTi Instruments with Different Alloy Treatments
    José Aranguren, Felipe Oliveros-Porras, Ana Ramírez-Muñoz, Irene Pérez, Marcela Salamanca-Ramos, Karim Aazzouzi-Raiss, Alejandro R. Pérez
    Materials.2024; 17(19): 4817.     CrossRef
  • Evaluation of the Centering Ability and Canal Transportation of Rotary File Systems in Different Kinematics Using CBCT
    Nupur R Vasava, Shreya H Modi, Chintan Joshi, Mona C Somani, Sweety J Thumar, Aashray A Patel, Anisha D Parmar, Kruti M Jadawala
    World Journal of Dentistry.2024; 14(11): 983.     CrossRef
  • Apical Transportation of Apical Foramen by Different NiTi Alloy Systems: A Systematic Review
    Francesco Puleio, Ugo Bellezza, Alessandra Torre, Francesco Giordano, Giuseppe Lo Giudice
    Applied Sciences.2023; 13(19): 10555.     CrossRef
  • Comparative evaluation of cleaning efficiency of single file NiTi rotary system during root canal treatment procedure - A scanning electron microscope study
    Ruchi Vashisht, Umesh Kumar, Swaty Jhamb, Ruchi Singla
    Journal of Conservative Dentistry.2023; 26(3): 316.     CrossRef
  • Reciprocial movements of endodontic files - simpler and more certain therapeutic procedure
    Slavoljub Zivkovic, Marijana Popovic-Bajic, Marija Zivkovic
    Stomatoloski glasnik Srbije.2022; 69(1): 22.     CrossRef
  • Canal transportation and centering ability of root canals prepared using rotary and reciprocating systems with and without PathFiles in cone-beam computed tomography-based three-dimensional molar prototypes
    MSruthi Sunildath, Josey Mathew, Liza George, RV Vineet, Priya Thomas, Dhanya John
    Journal of Conservative Dentistry.2021; 24(3): 246.     CrossRef
  • Evaluation of Curved Canal Transportation Using the Neoniti Rotary System with Reciprocal Motion: A Comparative Study
    Mohsen Aminsobhani, Arvin Rezaei Avval, Fatemeh Hamidzadeh, Luca Testarelli
    International Journal of Dentistry.2021; 2021: 1.     CrossRef
  • Cone-beam computed tomography assessment of root canal transportation and evaluation of remaining dentin thickness using XP EndoShaper and EndoStar E5
    Nikita Arun Kamat, Saritha Vallabhaneni, Prahlad Saraf, Laxmikant Kamatagi, Shrishail Totad
    Endodontology.2021; 33(1): 30.     CrossRef
  • Shaping Ability of Reciprocating Single-file Systems in Simulated Canals: Reciproc versus Reciproc Blue
    İrem ÇETİNKAYA, Mukadder İnci BAŞER KOLCU
    SDÜ Tıp Fakültesi Dergisi.2021; 28(1): 145.     CrossRef
  • Canal shaping with a reciprocating system is easy to learn
    E. Muñoz, L. Forner, S. Garcet, F. J. Rodríguez‐Lozano, C. Llena
    International Endodontic Journal.2019; 52(8): 1244.     CrossRef
  • Transportation assessment in artificial curved canals after instrumentation with Reciproc, Reciproc Blue, and XP‐endo Shaper Systems
    Juan Pacheco‐Yanes, Isbelia Gazzaneo, Alejandro R. Pérez, Luciana Armada, Mônica A. S. Neves
    Journal of Investigative and Clinical Dentistry.2019;[Epub]     CrossRef
  • Root canal volume change and transportation by Vortex Blue, ProTaper Next, and ProTaper Universal in curved root canals
    Hyun-Jin Park, Min-Seock Seo, Young-Mi Moon
    Restorative Dentistry & Endodontics.2018;[Epub]     CrossRef
  • Shaping ability of protaper next compared with waveone in late-model three-dimensional printed teeth
    Zhi Cui, Zhao Wei, Minquan Du, Ping Yan, Han Jiang
    BMC Oral Health.2018;[Epub]     CrossRef
  • A new methodology for the measurement of the root canal curvature and its 3D modification after instrumentation
    Asterios Christodoulou, Georgios Mikrogeorgis, Triantafillia Vouzara, Konstantinos Papachristou, Christos Angelopoulos, Nikolaos Nikolaidis, Ioannis Pitas, Kleoniki Lyroudia
    Acta Odontologica Scandinavica.2018; 76(7): 488.     CrossRef
  • A comparison of the shaping ability of three nickel-titanium rotary instruments: a micro-computed tomography study via a contrast radiopaque technique in vitro
    Zhao Wei, Zhi Cui, Ping Yan, Han Jiang
    BMC Oral Health.2017;[Epub]     CrossRef
  • Canal shaping of different single-file systems in curved root canals
    Maurizio D'Amario, Francesco De Angelis, Maddalena Mancino, Massimo Frascaria, Mario Capogreco, Camillo D'Arcangelo
    Journal of Dental Sciences.2017; 12(4): 328.     CrossRef
  • The impact of clinical use on the torsional behavior of Reciproc and WaveOne instruments
    Rafael Rodrigues Soares de MAGALHÃES, Lígia Carolina Moreira BRAGA, Érika Sales Joviano PEREIRA, Isabella Faria da Cunha PEIXOTO, Vicente Tadeu Lopes BUONO, Maria Guiomar de Azevedo BAHIA
    Journal of Applied Oral Science.2016; 24(4): 310.     CrossRef
  • Comparison of canal transportation in simulated curved canals prepared with ProTaper Universal and ProTaper Gold systems
    Emmanuel João Nogueira Leal Silva, Brenda Leite Muniz, Frederico Pires, Felipe Gonçalves Belladonna, Aline Almeida Neves, Erick Miranda Souza, Gustavo De-Deus
    Restorative Dentistry & Endodontics.2016; 41(1): 1.     CrossRef
  • WaveOne Rotary Instruments after Clinical Use
    Ya Shen, Jeffrey M. Coil, Anthony John Mo, Zhejun Wang, Ahmed Hieawy, Yan Yang, Markus Haapasalo
    Journal of Endodontics.2016; 42(2): 186.     CrossRef
  • Does the Reciproc file remove root canal bacteria and endotoxins as effectively as multifile rotary systems?
    A. C. S. Marinho, F. C. Martinho, L. M. Gonçalves, H. R. C. Rabang, B. P. F. A. Gomes
    International Endodontic Journal.2015; 48(6): 542.     CrossRef
  • Shaping Ability of 4 Different Single-file Systems in Simulated S-shaped Canals
    Abdulrahman Mohammed Saleh, Pouyan Vakili Gilani, Saeid Tavanafar, Edgar Schäfer
    Journal of Endodontics.2015; 41(4): 548.     CrossRef
  • Shaping Ability of Reciproc, UnicOne, and Protaper Universal in Simulated Root Canals
    Etevaldo Matos Maia Filho, Cláudia de Castro Rizzi, Matheus Bandeca Coelho, Sara Freitas Santos, Luzia Mayanne Oliveira Costa, Ceci Nunes Carvalho, Rudys Rodolfo de Jesus Tavarez, Janir Alves Soares, Cornelis H. Pameijer
    The Scientific World Journal.2015;[Epub]     CrossRef
  • Current Assessment of Reciprocation in Endodontic Preparation: A Comprehensive Review—Part II: Properties and Effectiveness
    Gianluca Plotino, Hany Mohamed Aly Ahmed, Nicola Maria Grande, Stephen Cohen, Frédéric Bukiet
    Journal of Endodontics.2015; 41(12): 1939.     CrossRef
  • Comparative evaluation of the shaping ability of WaveOne, Reciproc and OneShape single‐file systems in severely curved root canals of extracted teeth
    S. E. D. M. Saber, M. M. Nagy, E. Schäfer
    International Endodontic Journal.2015; 48(1): 109.     CrossRef
  • Quantitative Transportation Assessment in Simulated Curved Canals Prepared with an Adaptive Movement System
    Emmanuel João Nogueira Leal Silva, Michele Dias Nunes Tameirão, Felipe Gonçalves Belladonna, Aline Almeida Neves, Erick Miranda Souza, Gustavo De-Deus
    Journal of Endodontics.2015; 41(7): 1125.     CrossRef
  • Shaping ability of ProTaper Universal, WaveOne and ProTaper Next in simulated L-shaped and S-shaped root canals
    Hui Wu, Cheng Peng, Yulong Bai, Xin Hu, Lei Wang, Changyi Li
    BMC Oral Health.2015;[Epub]     CrossRef
  • Shaping characteristics of two different motions nickel titanium file: a preliminary comparative study of surface profile and dentin chip
    So-Ra Park, Se-Hee Park, Kyung-Mo Cho, Jin-Woo Kim
    Journal of Dental Rehabilitation and Applied Science.2014; 30(2): 121.     CrossRef
  • Effect of passive ultrasonic agitation during final irrigation on cleaning capacity of hybrid instrumentation
    Marcilene Coelho Vinhorte, Eduardo Hideki Suzuki, Maíra Sousa de Carvalho, André Augusto Franco Marques, Emílio Carlos Sponchiado Júnior, Lucas da Fonseca Roberti Garcia
    Restorative Dentistry & Endodontics.2014; 39(2): 104.     CrossRef
  • Influence of operator's experience level on lifespan of the WaveOne Primary file in extracted teeth
    Abdulrahman Mohammed Saleh, Saeid Tavanafar, Pouyan Vakili-Gilani, Noor Jamal Al Sammerraie, Faahim Rashid
    Restorative Dentistry & Endodontics.2013; 38(4): 222.     CrossRef
  • Endodontic treatment of mandibular molar with root dilaceration using Reciproc single-file system
    Daniely Amorin Meireles, Mariana Mena Barreto Bastos, André Augusto Franco Marques, Lucas da Fonseca Roberti Garcia, Emílio Carlos Sponchiado
    Restorative Dentistry & Endodontics.2013; 38(3): 167.     CrossRef
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Effect of CQ-amine ratio on the degree of conversion in resin monomers with binary and ternary photoinitiation systems
Ho-Jin Moon, Dong-Hoon Shin
Restor Dent Endod 2012;37(2):96-102.   Published online May 18, 2012
DOI: https://doi.org/10.5395/rde.2012.37.2.96
AbstractAbstract PDFPubReaderePub
Objectives

This study evaluated the effect of camphorquinone (CQ)-amine ratio on the C=C double bond conversion of resins with binary and ternary photoinitiation systems.

Materials and Methods

Two monomer mixtures (37.5 Bis-GMA/37.5 Bis-EMA/25 TEGDMA) with binary systems (CQ/DMAEMA in weight ratio, group A [0.5/1.0] and B [1.0/0.5]) and four mixtures with ternary system (CQ/OPPI/DMAEMA, group C [0.1/1.0/0.1], D [0.1/1.0/0.2], E [0.2/1.0/0.1] and F [0.2/1.0/0.2]) were tested: 1 : 2 or 2 : 1 CQ-amine ratio in binary system, while 1 : 1 ratio was added in ternary system. The monomer mixture was cured for 5, 20, 40, and 300 sec with a Demetron 400 curing unit (Demetron). After each exposure time, degree of conversion (DC) was estimated using Fourier transform infrared (FTIR) spectrophotometer (Nicolet 520, Nicolet Instrument Corp.). The results were analyzed by ANOVA followed by Scheffe test, with p = 0.05 as the level of significance.

Results

DC (%) was expressed in the order of curing time (5, 20, 40, and 300 sec). Group A (14.63 ± 10.42, 25.23 ± 6.32, 51.62 ± 2.69, 68.52 ± 2.77); Group B (4.04 ± 6.23, 16.56 ± 3.38, 37.95 ± 2.79, 64.48 ± 1.21); Group C (16.87 ± 5.72, 55.47 ± 2.75, 60.83 ± 2.07, 68.32 ± 3.31); Group D (23.77 ± 1.64, 61.05 ± 1.82, 65.13 ± 2.09, 71.87 ± 1.17); Group E (28.66 ± 2.92, 56.68 ± 1.33, 60.66 ± 1.17, 68.78 ± 1.30); Group F (39.74 ± 6.31, 61.07 ± 2.58, 64.22 ± 2.29, 69.94 ± 2.15).

Conclusion

All the monomers with ternary photoinitiation system showed higher DC than the ones with binary system, until 40 sec. Concerning about the effect of CQ-amine ratio on the DC, group A converted into polymer more than group B in binary system. However, there was no significant difference among groups with ternary system, except group C when cured for 5 sec only.

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  • The power of light – From dental materials processing to diagnostics and therapeutics
    Mohammed A. Hadis, Adrian C. Shortall, William M. Palin
    Biomaterial Investigations in Dentistry.2024; : 1.     CrossRef
  • Mechanical Properties of Experimental Composites with Different Photoinitiator
    Luis Felipe Marques de Resende, Anderson Catelan, Kusai Baroudi, Alan Rodrigo Muniz Palialol, Alexandre Marques de Resende, Ana Carolina Andreucci, Rayssa Ferreira Zanatta, Priscila Christiane Suzy Liporoni
    European Journal of Dentistry.2022; 16(01): 167.     CrossRef
  • Long-term bonding efficacy of adhesives containing benzodioxioles as alternative co-initiators
    Giana da Silveira LIMA, Andressa Goicochea MOREIRA, Carine Tais Welter MEEREIS, Ginia Brito LIMA, Fernanda Barbosa LEAL, Rafael Ratto de MORAES, Fabrício A OGLIARI, Cesar Liberato PETZHOLD, Evandro PIVA
    Brazilian Oral Research.2018;[Epub]     CrossRef
  • Piperonyl methacrylate: Copolymerizable coinitiator for adhesive compositions
    Andressa Goicochea Moreira, Carlos Enrique Cuevas-Suárez, Wellington Luiz de Oliveira da Rosa, Aline Oliveira Ogliari, Cesar Liberato Petzhold, Evandro Piva, Fabrício Aulo Ogliari, Giana da Silveira Lima
    Journal of Dentistry.2018; 79: 31.     CrossRef
  • Kinetics of bulk photo-initiated copper(i)-catalyzed azide–alkyne cycloaddition (CuAAC) polymerizations
    Han Byul Song, Austin Baranek, Christopher N. Bowman
    Polymer Chemistry.2016; 7(3): 603.     CrossRef
  • 1,3-Butadiene as an Adhesion Promoter Between Composite Resin and Dental Ceramic in a Dielectric Barrier Discharge Jet
    Geum-Jun Han, Sung-No Chung, Bae-Hyeock Chun, Chang-Keun Kim, Kyu Hwan Oh, Byeong-Hoon Cho
    Plasma Chemistry and Plasma Processing.2013; 33(2): 539.     CrossRef
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Basic Researchs
Optimal combination of 3-component photoinitiation system to increase the degree of conversion of resin monomers
Chang-Gyu Kim, Ho-Jin Moon, Dong-Hoon Shin
J Korean Acad Conserv Dent 2011;36(4):313-323.   Published online July 31, 2011
DOI: https://doi.org/10.5395/JKACD.2011.36.4.313
AbstractAbstract PDFPubReaderePub
Objectives

This study investigated the optimal combination of 3-component photoinitiation system, consisting of CQ, p-octyloxy-phenyl-phenyl iodonium hexafluoroantimonate (OPPI), and 2-dimethylaminoethyl methacrylate (DMAEMA) to increase the degree of conversion of resin monomers, and analyze the effect of the ratio of the photoinitiator to the co-initiator.

Materials and Methods

Each photoinitiators (CQ and OPP) and co-initiator (DMAEMA) were mixed in three levels with 0.2 wt.% (low concentration, L), 1.0 wt.% (medium concentration, M), and 2.0 wt.% (high concentration, H). A total of nine groups using the Taguchi method were tested according to the following proportion of components in the photoinitiator system: LLL, LMM, LHH, MLM, MMH, MHL, HLH, HML, HHM. Each monomer was polymerized using a quartz-tungsten-halogen curing unit (Demetron 400, USA) for 5, 20, 40, 60, 300 sec and the degree of conversion (DC) was determined at each exposure time using FTIR.

Results

Significant differences were found for DC values in groups. MMH group and HHM group exhibited greater initial DC than the others. No significant difference was found with the ratio of the photoinitiators (CQ, OPPI) to the co-initiator (DMAEMA). The concentrations of CQ didn't affect the DC values, but those of OPPI did strongly.

Conclusions

MMH and HHM groups seem to be best ones to get increased DC. MMH group is indicated for bright, translucent color and HHM group is good for dark, opaque colored-resin.

Citations

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  • Evaluation of Surface Roughness of Composite, Compomer and Carbomer After Curing Through Mylar Strip and Glycerin: A Comparative Study
    Asli Topaloglu-Ak, Dilara Çayırgan, Melisa Uslu
    Journal of Advanced Oral Research.2020; 11(1): 12.     CrossRef
  • Effect of CQ-amine ratio on the degree of conversion in resin monomers with binary and ternary photoinitiation systems
    Ho-Jin Moon, Dong-Hoon Shin
    Restorative Dentistry & Endodontics.2012; 37(2): 96.     CrossRef
  • Effect of glycerin on the surface hardness of composites after curing
    Hyun-Hee Park, In-Bog Lee
    Journal of Korean Academy of Conservative Dentistry.2011; 36(6): 483.     CrossRef
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Effect of the difference in spectral outputs of the single and dual-peak LEDs on the microhardness and the color stability of resin composites
Hye-Jung Park, Sung-Ae Son, Bock Hur, Hyeon-Cheol Kim, Yong-Hoon Kwon, Jeong-Kil Park
J Korean Acad Conserv Dent 2011;36(2):108-113.   Published online March 31, 2011
DOI: https://doi.org/10.5395/JKACD.2011.36.2.108
AbstractAbstract PDFPubReaderePub
Objectives

To determine the effect of the spectral output of single and dual-peak light emitting diode (LED) curing lights on the microhardness and color stability of commercial resin composites formulated with camphorquinone and alternative photoinitiators in combination.

Materials and Methods

Three light-polymerized resin composites (Z100 (3M ESPE), Tetric Ceram (Ivoclar Vivadent) and Aelite LS Posterior (Bisco)) with different photoinitiator systems were used. The resin composites were packed into a Teflon mold (8 mm diameter and 2 mm thickness) on a cover glass. After packing the composites, they were light cured with single-peak and dual-peak LEDs. The Knoop microhardness (KHN) and color difference (ΔE) for 30 days were measured. The data was analyzed statistically using a student's t-test (p < 0.05).

Results

All resin composites showed improved microhardness when a third-generation dual-peak LED light was used. The color stability was also higher for all resin composites with dual-peak LEDs. However, there was a significant difference only for Aelite LS Posterior.

Conclusions

The dual-peak LEDs have a beneficial effect on the microhardness and color stability of resin composites formulated with a combination of camphorquinone and alternative photoinitiators.

Citations

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  • Effect of irradiance from curing units on the microhardness of composite - a systematic review
    Neenu Francis, Rakesh R. Rajan, Vijay Kumar, Anju Varughese, Vineetha Karuveetil, C. M. Sapna
    Evidence-Based Dentistry.2022;[Epub]     CrossRef
  • Micro-computed tomography evaluation of volumetric polymerization shrinkage and degree of conversion of composites cured by various light power outputs
    Pablo J. ATRIA, Camila S. SAMPAIO, Eduardo CÁCERES, Jessica FERNÁNDEZ, Andre F. REIS, Marcelo GIANNINI, Paulo G. COELHO, Ronaldo HIRATA
    Dental Materials Journal.2018; 37(1): 33.     CrossRef
  • Effect of the irradiance distribution from light curing units on the local micro-hardness of the surface of dental resins
    Thomas Haenel, Berenika Hausnerová, Johannes Steinhaus, Richard B.T. Price, Braden Sullivan, Bernhard Moeginger
    Dental Materials.2015; 31(2): 93.     CrossRef
  • 1,3-Butadiene as an Adhesion Promoter Between Composite Resin and Dental Ceramic in a Dielectric Barrier Discharge Jet
    Geum-Jun Han, Sung-No Chung, Bae-Hyeock Chun, Chang-Keun Kim, Kyu Hwan Oh, Byeong-Hoon Cho
    Plasma Chemistry and Plasma Processing.2013; 33(2): 539.     CrossRef
  • Optimal combination of 3-component photoinitiation system to increase the degree of conversion of resin monomers
    Chang-Gyu Kim, Ho-Jin Moon, Dong-Hoon Shin
    Journal of Korean Academy of Conservative Dentistry.2011; 36(4): 313.     CrossRef
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Review Article
Mechanical and geometric features of endodontic instruments and its clinical effect
Hyeon-Cheol Kim
J Korean Acad Conserv Dent 2011;36(1):1-11.   Published online January 14, 2011
DOI: https://doi.org/10.5395/JKACD.2011.36.1.1
AbstractAbstract PDFPubReaderePub
Abstract Introduction:

The aim of this paper is to discuss the mechanical and geometric features of Nickel-titanium (NiTi) rotary files and its clinical effects. NiTi rotary files have been introduced to the markets with their own geometries and claims that they have better ability for the root canal shaping than their competitors. The contents of this paper include the (possible) interrelationship between the geometries of NiTi file (eg. tip, taper, helical angle, etc) and clinical performance of the files as follows;

- Fracture modes of NiTi rotary files

- Non-cutting guiding tip and glide path

- Taper and clinical effects

- Cross-sectional area and clinical effects

- Heat treatments and surface characteristics

- Screw-in effect and preservation of root dentin integrity

- Designs for reducing screw-in effect

Conclusions:

Based on the reviewed contents, clinicians may have an advice to use various brands of NiTi rotary instruments regarding their advantages which would fit for clinical situation.

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  • Cyclic fatigue resistance tests of Nickel-Titanium rotary files using simulated canal and weight loading conditions
    Ok-In Cho, Antheunis Versluis, Gary SP Cheung, Jung-Hong Ha, Bock Hur, Hyeon-Cheol Kim
    Restorative Dentistry & Endodontics.2013; 38(1): 31.     CrossRef
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Original Articles
Microleakage of the experimental composite resin with three component photoinitiator systems
Ji-Hoon Kim, Dong-Hoon Shin
J Korean Acad Conserv Dent 2009;34(4):333-339.   Published online July 31, 2009
DOI: https://doi.org/10.5395/JKACD.2009.34.4.333
AbstractAbstract PDFPubReaderePub

This study was done to determine if there is any difference in microleakage between experimental composite resins, in which various proportions of three component photoinitiators (Camphoroquinone, OPPI, Amine) were included.

Four kinds of experimental composite resin were made by mixing 3.2% silanated barium glass (78 wt.%, average size; 1 µm) with each monomer system including variously proportioned photoinitiator systems used for photoinitiating BisGMA/BisEMA/TEGDMA monomer blend (37.5:37.5:25 wt.%). The weight percentage of each component were as follows (in sequence Camphoroquinone, OPPI, Amine): Group A - 0.5%, 0%, 1% / Group B - 2%, 0.2%, 2% / Group C - 0.2%, 1%, 0.2% / Group D - 1%, 1%, 2%.

Each composite resin was used as a filling material for round class V cavities (diameter: 2/3 of mesiodistal width; depth: 1.5 mm) made on extracted human premolars and they were polymerized using curing light unit (XL 2500, 3M ESPE) for 40 s with an intensity of 600 mW/cm2. Teeth were thermocycled five-hundred times between 50℃ and 550℃ for 30s at each temperature.

Electrical conductivity (µA) was recorded two times (just after thermocycling and after three-month storage in saline solution) by electrochemical method.

Microleakage scores of each group according to evaluation time were as follows [Group: at first record / at second record; unit (µA)]: A: 3.80 (0.69) / 13.22 (4.48), B: 3.42 (1.33) / 18.84 (5.53), C: 4.18 (2.55) / 28.08 (7.75), D: 4.12 (1.86) / 7.41 (3.41).

Just after thermocycling, there was no difference in microleakage between groups, however, group C showed the largest score after three-month storage. Although there seems to be no difference in microleakage between groups just after thermocycling, composite resin with highly concentrated initiation system or classical design (Camphoroquinone and Amine system) would be more desirable for minimizing microleakage after three-month storage.

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  • Comparison of polymerization shrinkage of dual-cure core build-up resin according to shade and curing mode
    Yoorina Choi, Karl Lee, Hoon-Sang Chang
    Oral Biology Research.2019; 43(4): 243.     CrossRef
  • Optimal combination of 3-component photoinitiation system to increase the degree of conversion of resin monomers
    Chang-Gyu Kim, Ho-Jin Moon, Dong-Hoon Shin
    Journal of Korean Academy of Conservative Dentistry.2011; 36(4): 313.     CrossRef
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A comparison of master apical file size according to instrumentation in type II root canal
Eun-Ju Jeong, Dong-Kyun Lee, Shin-Young Baek, Ho-Keel Hwang
J Korean Acad Conserv Dent 2008;33(5):435-442.   Published online September 30, 2008
DOI: https://doi.org/10.5395/JKACD.2008.33.5.435
AbstractAbstract PDFPubReaderePub

Type II root canal was defined that two canals leave the chamber and merge to form a single canal at short of the apex. The aim of this study was to analyse the master apical file (MAF) size according to various instrumentation techniques in the type II root canal when each canal was enlarged to working length.

Eighty mesial roots of molar with ISO #15 initial apical file (IAF) size in type II root canals were randomly divided into four experimental groups with 20 teeth each. According to enlarging instruments, four groups are: K-FLEXOFILE® (KF), engine-driven Ni-Ti PROTAPER® (PT), HERO Shaper® (HS), K3 ™ (K3). All canals were enlarged to each working length with ISO #30 size: #30 in KF, F3 in PT, .04/30 in HS, and .06/30 in K3. The master apical file (MAF) size was confirmed by tactile sensation and universal testing machine (EZ test, Shimadzu Co., Kyoto, Japan). The mean MAF size was statistically compared using one-way ANOVA and Tukey HSD test at the 0.05 probability level.

These results show that the MAF size was appeared one or two sizes larger than the final enlarging instrument when all canal in type II configuration were enlarged to each working length. Therefore, the clinician have to confirm the apical stop once more after instrumentation of type II root canal.

Citations

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  • Apical foramen morphology according to the length of merged canal at the apex
    Hee-Ho Kim, Jeong-Bum Min, Ho-Keel Hwang
    Restorative Dentistry & Endodontics.2013; 38(1): 26.     CrossRef
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Comparative analysis of various corrosive environmental conditions for NiTi rotary files
Ji-Wan Yum, Jeong-Kil Park, Bock Hur, Hyeon-Cheol Kim
J Korean Acad Conserv Dent 2008;33(4):377-388.   Published online July 31, 2008
DOI: https://doi.org/10.5395/JKACD.2008.33.4.377
AbstractAbstract PDFPubReaderePub

The aim of the present study is to compare the corrosion tendency using two kinds of NiTi files in the various environmental conditions through the visual examination and electrochemical analysis. ProTaper Universal S2, 21 mm (Dentsply Maillefer, Ballaigues, Switzerland) and Hero 642, 0.06 tapers, size 25, 21 mm (Micromega, Besancon, France) rotary instruments were tested. The instruments were randomly divided into eighteen groups (n = 5) by the immersion temperature, the type of solution, the brand of NiTi rotary instrument and the presence of mechanical loading. Each file was examined at various magnifications using Scanning Electron Microscope (JEOL, Akishima, Tokyo, Japan) equipped with energy dispersive X-ray microanalysis (EDX). EDX was used to determine the components of the endodontic file alloy in corroded and noncorroded areas. The corrosion resistance of unused and used NiTi files after repeated uses in the human teeth was evaluated electrochemically by potentiodynamic polarization test using a potentiostat (Applied Corrosion Monitoring, Cark-in-Cartmel, UK).

Solution temperature and chloride ion concentration may affect on passivity of NiTi files. Under the conditions of this in vitro study, the corrosion resistance is slightly increased after clinical use.

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  • Comparing Cyclic Fatigue Resistance and Free Recovery Transformation Temperature of NiTi Endodontic Single-File Systems Using a Novel Testing Setup
    Emad Youssef, Holger Jungbluth, Søren Jepsen, Manfred Gruener, Christoph Bourauel
    Materials.2024; 17(3): 566.     CrossRef
  • The Determination of the Corrosion Rates of Rotary Ni-Ti Instruments in Various Irrigation Solutions
    Tolga Özcan, Bade Sonat, Meltem Dartar Öztan, Fatma Basmaci, Umut Aksoy
    Cyprus Journal of Medical Sciences.2023; 8(2): 136.     CrossRef
  • A Nonlinear Probabilistic Pitting Corrosion Model of Ni–Ti Alloy Immersed in Shallow Seawater
    Špiro Ivošević, Gyöngyi Vastag, Nataša Kovač, Peter Majerič, Rebeka Rudolf
    Micromachines.2022; 13(7): 1031.     CrossRef
  • Corrosion resistance assessment of nickel-titanium endodontic files with and without heat treatment
    Tatiana Dias Costa, Elison da Fonseca e Silva, Paula Liparini Caetano, Marcio José da Silva Campos, Leandro Marques Resende, André Guimarães Machado, Antônio Márcio Resende do Carmo
    Restorative Dentistry & Endodontics.2021;[Epub]     CrossRef
  • Effect of Sodium Hypochlorite, EDTA, and Chitosan Solution on Corrosion and Quantity of Extruded Nickel Ions Using Two Rotary Instruments (In Vitro)
    Eltica Oktavia, Trimurni Abidin
    World Journal of Dentistry.2019; 10(3): 207.     CrossRef
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Stress distribution of three NiTi rotary files under bending and torsional conditions using 3-dimensional finite element analysis
Tae-Oh Kim, Chan-Joo Lee, Byung-Min Kim, Jeong-Kil Park, Bock Hur, Hyeon-Cheol Kim
J Korean Acad Conserv Dent 2008;33(4):323-331.   Published online July 31, 2008
DOI: https://doi.org/10.5395/JKACD.2008.33.4.323
AbstractAbstract PDFPubReaderePub

Flexibility and fracture properties determine the performance of NiTi rotary instruments. The purpose of this study was to evaluate how geometrical differences between three NiTi instruments affect the deformation and stress distributions under bending and torsional conditions using finite element analysis.

Three NiTi files (ProFile .06 / #30, F3 of ProTaper and ProTaper Universal) were scanned using a Micro-CT. The obtained structural geometries were meshed with linear, eight-noded hexahedral elements. The mechanical behavior (deformation and von Mises equivalent stress) of the three endodontic instruments were analyzed under four bending and rotational conditions using ABAQUS finite element analysis software. The nonlinear mechanical behavior of the NiTi was taken into account.

The U-shaped cross sectional geometry of ProFile showed the highest flexibility of the three file models. The ProTaper, which has a convex triangular cross-section, was the most stiff file model. For the same deflection, the ProTaper required more force to reach the same deflection as the other models, and needed more torque than other models for the same amount of rotation. The highest von Mises stress value was found at the groove area in the cross-section of the ProTaper Universal.

Under torsion, all files showed highest stresses at their groove area. The ProFile showed highest von Mises stress value under the same torsional moment while the ProTaper Universal showed the highest value under same rotational angle.

Citations

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  • Effect of internal stress on cyclic fatigue failure in .06 taper ProFile
    Hye-Rim Jung, Jin-Woo Kim, Kyung-Mo Cho, Se-Hee Park
    Restorative Dentistry & Endodontics.2012; 37(2): 79.     CrossRef
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Effect of intermediate resin hydrophilicity on bond strength of single step adhesive
Yong-Sung Kim, Sang-Hyuk Park, Gi-Woon Choi, Kyoung-Kyu Choi
J Korean Acad Conserv Dent 2007;32(5):445-458.   Published online September 30, 2007
DOI: https://doi.org/10.5395/JKACD.2007.32.5.445
AbstractAbstract PDFPubReaderePub

The purpose of this study was to evaluate the bond strength of a new Single step system with different curing mode composites, and to evaluate the effect of the intermediate resins which have different hydrophilicity on bonding ability by means of the micro shear bond testing and TEM examination for the adhesive interface. The adhesive used in this study was an experimental single step system (Bisco Inc., Schaumburg, IL). Experimental groups were produced by using six kinds of intermediate resin having different hydrophilicity that was hydrophilic, hydrophobic and most hydrophobic resin and as filled or not after applying adhesive. Each experimental group was further divided into two subgroups whether the adhesive was light cured or not. Dual cured composite (Bis Core, Bisco Ltd., Schaumburg, IL) was placed on the adhesive layer as light cure or self cure mode. The results of bond strength were statistically analyzed using one way ANOVA and multiple comparisons are made using Tukey's test at α < 0.05 level.

The results of this study were as follows;

1. The application of intermediate resin did not increase the bond strength for light cured composite.

2. The bond strength of an experimental adhesive with self cured composite was significantly increased by the application of intermediate resin layer.

3. The bond strength of adhesive was irrespective of the cure or not of itself before intermediate resin layer applied.

4. As applied hydrophilic resin layer was, the initial bond strength was higher than both hydrophobic and most hydrophobic one used but there was no significance.

Using a single step adhesive with dual/self cured composite, the incompatibility between both of them should be solved by the application of intermediate hydrophobic resin to reduce the adhesive permeability. However, Single step adhesive can be used in the light cured composite restoration without any decrease of the initial bond strength.

Citations

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  • The effect of priming etched dentin with solvent on the microtensile bond strength of hydrophobic dentin adhesive
    Eun-Sook Park, Ji-Hyun Bae, Jong-Soon Kim, Jae-Hoon Kim, In-Bog Lee, Chang-Keun Kim, Ho-Hyun Son, Byeong-Hoon Cho
    Journal of Korean Academy of Conservative Dentistry.2009; 34(1): 42.     CrossRef
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Comparison of screw-in effect of three NiTi file systems used by undergraduates
Seung-Hei Oh, Jeong-Kil Park, Bock Hur, Hyeon-Cheol Kim
J Korean Acad Conserv Dent 2006;31(6):477-484.   Published online November 30, 2006
DOI: https://doi.org/10.5395/JKACD.2006.31.6.477
AbstractAbstract PDFPubReaderePub

The purposes of this study were to compare the apical terminus width of simulated curved root canal prepared with three NiTi file systems used by undergraduates for evaluation the effects of flute angle and pitch or radial land on reducing screw-in effect and to determine more safe NiTi file system for inexperienced operators.

Fifty inexperienced undergraduate students prepared 150 simulated curved root canals in resin blocks with three NiTi file systems ; ProFile®, Hero Shaper®, K3™. The electric motor set at a speed of 300 rpm and torque of 30 in a 16 : 1 reduction handpiece was used. The simulated root canal was prepared to ISO #25 sizes with each file system. The scanned images of pre- and post-instrumented canal of resin block were superimposed. To evaluate the screw-in effect of three NiTi file systems, apical terminus width of root canal was measured from superimposed images and statistical analysis was performed.

There were significant differences in three NiTi file systems. ProFile® had significantly smaller width than Hero Shaper® and K3™ (P < 0.05), but no significant difference was observed between K3™ and Hero Shaper®.

Under the condition of this study, active file system (Hero Shaper®, K3™) with variable pitch and helical angle had more screw-in effect than passive file system (ProFile®) with constant pitch and helical angle. It seems that the radial lands play more important role in reducing screw-in effect.

Citations

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  • Mechanical and geometric features of endodontic instruments and its clinical effect
    Hyeon-Cheol Kim
    Journal of Korean Academy of Conservative Dentistry.2011; 36(1): 1.     CrossRef
  • Comparison of screw-in effect for several nickel-titanium rotary instruments in simulated resin root canal
    Jung-Hong Ha, Myoung-Uk Jin, Young-Kyung Kim, Sung-Kyo Kim
    Journal of Korean Academy of Conservative Dentistry.2010; 35(4): 267.     CrossRef
  • Influence of taper on the screw-in effect of nickel-titanium rotary files in simulated resin root canal
    Hye-Jin Sung, Jung-Hong Ha, Sung-Kyo Kim
    Journal of Korean Academy of Conservative Dentistry.2010; 35(5): 380.     CrossRef
  • Influence of root canal curvature on the screw-in effect of nickel-titanium rotary files in simulated resin root canal
    Ji-Young Son, Jung-Hong Ha, Young-Kyung Kim
    Journal of Korean Academy of Conservative Dentistry.2010; 35(5): 374.     CrossRef
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Lifetime and fracture patterns of NiTi rotary files in molars
Jin-Woo Kim, Byung-Doo Ahn, Se-Hee Park, Hye-Jin Shin, Kyung-Mo Cho
J Korean Acad Conserv Dent 2005;30(3):184-192.   Published online May 31, 2005
DOI: https://doi.org/10.5395/JKACD.2005.30.3.184
AbstractAbstract PDFPubReaderePub

Intracanal separation of the rotary files is a serious concern in modern endodontic practice. The objective of this study was to compare the life span and fracture patterns of three NiTi rotary files in molar teeth.

Mesiobuccal roots of upper molar (n = 150) and mesial roots of lower molar (n = 150) were divided into three groups and each group was prepared with Profile, ProTaper, and K3 respectively. Every file was used until separation and/or deterioration of the cutting blade was happened, and then the number of canals to separation and/or unwinding were recorded. Radiographs and Scanning electon microscope (SEM) photographs were taken to evaluate the patterns of separation.

The results were as follows :

1. There were no significant differences in numbers of canals to separation and/or unwinding among the groups.

2. Comparing between flaring files, K3 showed significant lower numbers of canals to separation and/or unwinding (p < 0.05), and there was no significant difference between shaping files

3. Separations of instruments were occurred at the midpoint of curvatures within the canals.

4. In SEM observations, ductile fractures were seen in most of cases, characterized by shallow dimples.

Additional researches is needed to provide a new guideline that informs the appropriate number of times to use NiTi files.

Citations

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  • Developing evidence-based clinical imaging guidelines for the diagnosis of vertically fractured teeth
    Ki-Hong Kim, Jo-Eun Kim, Sam-Sun Lee, Chena Lee, Miyoung Choi, Hwan Seok Yong, Seung Eun Jung, Min-Suk Heo, Kyung-Hoe Huh
    Oral Radiology.2024; 40(4): 471.     CrossRef
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Effect of surface defects and cross-sectional configuration on the fatigue fracture of NiTi rotary files under cyclic loading
Yu-Mi Shin, Eui-Sung Kim, Kwang-Man Kim, Kee-Yeon Kum
J Korean Acad Conserv Dent 2004;29(3):267-272.   Published online May 31, 2004
DOI: https://doi.org/10.5395/JKACD.2004.29.3.267
AbstractAbstract PDFPubReaderePub

The purpose of this in vitro study was to evaluate the effect of surface defects and cross-sectional configuration of NiTi rotary files on the fatigue life under cyclic loading. Three NiTi rotary files (K3™, ProFile®, and HERO 642®) with #30/.04 taper were evaluated. Each rotary file was divided into 2 subgroups: control (no surface defects) and experimental group (artificial surface defects). A total of six groups of each 10 were tested. The NiTi rotary files were rotated at 300rpm using the apparatus which simulated curved canal (40 degree of curvature) until they fracture. The number of cycles to fracture was calculated and the fractured surfaces were observed with a scanning electron microscope. The data were analyzed statistically. The results showed that experimental groups with surface defects had lower number of cycles to fracture than control group but there was only a statistical significance between control and experimental group in the K3™ (p<0.05). There was no strong correlation between the cross-sectional configuration area and fracture resistance under experimental conditions. Several of fractured files demonstrated characteristic patterns of brittle fracture consistent with the propagation of pre-existing cracks.

This data indicate that surface defects of NiTi rotary files may significantly decrease fatigue life and it may be one possible factor for early fracture of NiTi rotary files in clinical practice.

Citations

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    Keyvan Safaei, Mohammadreza Nematollahi, Parisa Bayati, Hediyeh Dabbaghi, Othmane Benafan, Mohammad Elahinia
    Engineering Structures.2021; 226: 111383.     CrossRef
  • Effect of internal stress on cyclic fatigue failure in K3
    Jun-Young Kim, Jin-Woo Kim, Kyung-Mo Cho, Se-Hee Park
    Restorative Dentistry & Endodontics.2012; 37(2): 74.     CrossRef
  • An evaluation of rotational stability in endodontic electronic motors
    Se-Hee Park, Hyun-Woo Seo, Chan-Ui Hong
    Journal of Korean Academy of Conservative Dentistry.2010; 35(4): 246.     CrossRef
  • Effect of cross-sectional area of 6 nickel-titanium rotary instruments on the fatigue fracture under cyclic flexural stress: A fractographic analysis
    Soo-Youn Hwang, So-Ram Oh, Yoon Lee, Sang-Min Lim, Kee-Yeon Kum
    Journal of Korean Academy of Conservative Dentistry.2009; 34(5): 424.     CrossRef
  • The Effect of Surface Defects on the Cyclic Fatigue Fracture of HEROShaper Ni-Ti rotary files in a Dynamic Model: A Fractographic Analysis
    Jung-Kyu Lee, Eui-Sung Kim, Myoung-Whai Kang, Kee-Yeon Kum
    Journal of Korean Academy of Conservative Dentistry.2007; 32(2): 130.     CrossRef
  • Comparative study on morphology of cross-section and cyclic fatigue test with different rotary NiTi files and handling methods
    Jae-Gwan Kim, Kee-Yeon Kum, Eui-Seong Kim
    Journal of Korean Academy of Conservative Dentistry.2006; 31(2): 96.     CrossRef
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The analysis of initial apical file size before and after coronal flaring
Ho-Keel Hwang, Chan-Ho Park, Seong-Chul Bae
J Korean Acad Conserv Dent 2003;28(1):64-71.   Published online January 31, 2003
DOI: https://doi.org/10.5395/JKACD.2003.28.1.064
AbstractAbstract PDFPubReaderePub

The purpose of this study was to compare the initial apical file(IAF) first file that fits to the apex in each canal before and after early flaring to analyze if the size of file to fit to the apex would increase after flaring. Eighty anterior teeth with complete apical formation and patent foramens were selected. The samples were randomly divided into 4 groups(GG, OS, GT, PT Group) of 20 teeth each. A file was fit to the apex in each canal and that size recorded. Radicular flaring were completed using different types of instruments. After flaring a file was again fit to the apex in the same manner as before and its size recorded.

The results of this study were as follows:

1. The mean diameter of IAF before flaring(file diameters in mm×10-2) was 19.81±8.32 before and 25.94±9.21 after(p<0.05).

2. The increase in diameter of IAF was approximately one file size for all groups.

3. Ranking of increasing diameter of IAF were GG>GT>OS>PT group. There was a statistically significant difference between before and after flaring(p<0.05).

4. Ranking of the time for flaring were GG>GT>OS>PT group. There was a statistically significant difference between GG group and other groups(p<0.05).

5. In the case without change of IAF diameter, they showed decrease in force after flaring when IAF was pulled out from root canal(p<0.05).

This study suggested that early radicular flaring increases the file size that is snug at the apex, and awareness of that difference gives the clinician a better sense of canal size. Early flaring of the canal provides better apical size information and with this awareness, a better decision can be made concerning the appropriate final diameter needed for complete apical shaping.

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