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Omori S, Ebihara A, Hirano K, Kasuga Y, Unno H, Nakatsukasa T, Kimura S, Maki K, Hanawa T, Okiji T. Effect of Rotational Modes on Torque/Force Generation and Canal Centering Ability during Rotary Root Canal Instrumentation with Differently Heat-Treated Nickel-Titanium Instruments. MATERIALS (BASEL, SWITZERLAND) 2022; 15:6850. [PMID: 36234189 PMCID: PMC9571549 DOI: 10.3390/ma15196850] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 09/18/2022] [Accepted: 09/27/2022] [Indexed: 06/16/2023]
Abstract
This study aimed to evaluate how various rotational modes influence the torque/force production and shaping ability of ProTaper Universal (PTU; non-heat-treated) and ProTaper Gold (PTG; heat-treated) nickel−titanium instruments. J-shaped resin canals were instrumented with PTU or PTG using an automated instrumentation device operated with reciprocating rotation [150° clockwise and 30° counterclockwise (R150/30) or 240° clockwise and 120° counterclockwise (R240/120)], optimum torque reverse motion (OTR), or continuous rotation (CR) (n = 10 each). Maximum force and torque were recorded, and canal centering ratios were calculated. Statistical analysis was performed with two-way ANOVA and a Bonferroni test (α = 0.05). The results were considered with reference to previous studies on the microstructure of the instruments. The upward force generated by R240/120 and OTR was smaller than that generated by R150/30 and CR in PTG (p < 0.05). The clockwise torque produced by OTR was lower than that produced by R150/30 in PTU and R240/120 and CR in PTG (p < 0.05). R240/120 and OTR induced less canal deviation compared to CR in PTU at 0 mm from the apex (p < 0.05). In conclusion, R240/120 and OTR reduced the screw-in force in PTG and improved the canal centering ability in PTU, which may be associated with the heat treatment-induced microstructural difference of the two instruments.
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Affiliation(s)
- Satoshi Omori
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
| | - Arata Ebihara
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
| | - Keiko Hirano
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
| | - Yuka Kasuga
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
| | - Hayate Unno
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
| | - Taro Nakatsukasa
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
| | - Shunsuke Kimura
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
| | - Keiichiro Maki
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
| | - Takao Hanawa
- Department of Metallic Biomaterials, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan
| | - Takashi Okiji
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
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Kyaw MS, Ebihara A, Maki K, Kimura S, Nakatsukasa T, Htun PH, Thu M, Omori S, Okiji T. Effect of kinematics on the torque/force generation, surface characteristics, and shaping ability of a nickel titanium rotary glide path instrument: an ex-vivo study. Int Endod J 2022; 55:531-543. [PMID: 35263803 DOI: 10.1111/iej.13718] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 03/01/2022] [Accepted: 03/01/2022] [Indexed: 11/30/2022]
Abstract
AIM To evaluate the effect of various rotational motions on the torque/force generation, surface wear, and shaping ability of the ProGlider glide path instrument (Dentsply Sirona). METHODOLOGY Mesiobuccal and mesiolingual canals of mandibular molars were selected based on the canal volume, length, angle of curvature (25°-40°), and radius of curvature (4-8 mm) after micro-computed tomographic scanning. The samples were randomly assigned to four groups (n = 13, each) according to movement kinematics [continuous rotation (CR; 300 rpm), optimum torque reverse motion (OTR; 180° forward and 90° reverse when torque > 0.4 N·cm), time-dependent reciprocal motion (TmR; 180° forward and 90° reverse), and optimum glide path motion (OGP; a combination of 90° forward, 90° reverse, 90° forward, and 120° reverse)]. Instrumentation was performed with an automated root canal instrument and torque/force analysing device. Maximum torque/force values, canal volume changes, and canal-centring ratios at 1, 3, 5, and 7 mm were evaluated. Surface defects (pits, grooves, microcracks, blunt cutting edges, and disruption of cutting edges) and spiral distortion on the ProGlider instrument were scored at the tip and 5 mm short of the tip before and after five consecutive uses with scanning electron microscopy. The Kruskal-Wallis test followed by Dunn's post-test with Bonferroni correction and Wilcoxon signed-rank test were used to analyse the data (α = 0.05). RESULTS OGP generated significantly less clockwise torque and greater upward force than other groups (P < 0.05). OGP resulted in significantly fewer surface defects than CR (P < 0.05). In OGP and CR, the tip exhibited more surface defects than 5 mm short of the tip (P < 0.05). CR resulted in greater volume changes than OGP and TmR (P < 0.05) and greater centring ratios (i.e., more deviation) than OGP at 1 mm and OTR at 3 mm (P < 0.05). CONCLUSIONS Under laboratory conditions using the ProGlider instrument, OGP generated significantly less clockwise torque and greater upward force than the other rotatory motions. OGP generated fewer superficial defects than CR, and the three modes of reciprocal rotation better maintained the apical curvature of root canals than CR with the ProGlider instrument.
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Affiliation(s)
- M S Kyaw
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.,Department of Conservative Dentistry, University of Dental Medicine (Mandalay), Mandalay, Myanmar
| | - A Ebihara
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - K Maki
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - S Kimura
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - T Nakatsukasa
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - P H Htun
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - M Thu
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - S Omori
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - T Okiji
- Department of Pulp Biology and Endodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
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Gavini G, Candeiro GTDM, Potgornik Ferreira F, Rubino GA, Aun CA, Bezerra AG, Malavasi M, Lemos ÉM, Caldeira CL, Akisue E. Retrospective study of endodontic treatment performed by undergraduate students using reciprocating instrumentation and single‐cone obturation. J Dent Educ 2022; 86:751-758. [DOI: 10.1002/jdd.12884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 12/13/2021] [Accepted: 12/23/2021] [Indexed: 11/11/2022]
Affiliation(s)
- Giulio Gavini
- Department of Restorative Dentistry Faculty of Dentistry University of São Paulo São Paulo Brazil
| | | | | | - Gustavo Alberto Rubino
- Department of Restorative Dentistry Faculty of Dentistry University of São Paulo São Paulo Brazil
| | - Carmo Antônio Aun
- Department of Restorative Dentistry Faculty of Dentistry ‐ Discipline of Endodontics University Santa Cecília Santos Brazil
| | - Alexandre Gomes Bezerra
- Department of Restorative Dentistry Faculty of Dentistry ‐ Discipline of Endodontics University Santa Cecília Santos Brazil
| | - Maurílio Malavasi
- Department of Restorative Dentistry Faculty of Dentistry ‐ Discipline of Endodontics University Santa Cecília Santos Brazil
| | - Érico Melo Lemos
- Department of Restorative Dentistry Faculty of Dentistry ‐ Discipline of Endodontics University Santa Cecília Santos Brazil
| | - Celso Luiz Caldeira
- Department of Restorative Dentistry Faculty of Dentistry University of São Paulo São Paulo Brazil
| | - Eduardo Akisue
- Department of Restorative Dentistry Faculty of Dentistry ‐ Discipline of Endodontics University Santa Cecília Santos Brazil
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Gavini G, Akisue E, Kawakami DAS, Caldeira CL, Candeiro GTDM, Vivan RR, Calefi PHS, Alcalde MP, Duarte MAH. Optimum glide path motion is safer than continuous rotation of files in glide path preparation. AUST ENDOD J 2021; 47:544-549. [PMID: 33913601 DOI: 10.1111/aej.12519] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 04/01/2021] [Accepted: 04/11/2021] [Indexed: 12/15/2022]
Abstract
This study evaluated the resistance to flexural fatigue and torsional strength of files for glide path preparation in continuous rotation or Optimum Glide Path motion (OGP). ScoutRace 15.02 and ProGlider 16.02 files were used in a dynamic testing device during preparation of simulating curved root canals (40-degree curvature and 5 mm radius). For the torsional test, a machine was used to test torsion measured maximum torsional strength (N.cm). Two-way anova and Tukey's multiple comparisons test were used for statistical analysis. Files in OGP motion had a statistically better resistance to flexural fatigue (P < 0.05). ProGlider files took longer time to failure than ScoutRace files only when OGP was used (P < 0.05). The torsional test revealed that OGP produced significantly less torsional stress than rotary motions for both types of glide path files (P < 0.05) In conclusion, OGP motion increased substantially the mechanical safety of endodontic glide path files.
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Affiliation(s)
- Giulio Gavini
- Post Graduation Program in Dentistry, Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, São Paulo, Brazil
| | - Eduardo Akisue
- Discipline of Endodontics, Faculty of Dentistry, University Santa Cecília, Santos, Brazil
| | | | - Celso Luiz Caldeira
- Post Graduation Program in Dentistry, Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, São Paulo, Brazil
| | | | - Rodrigo Ricci Vivan
- Post Graduation Program in Dentistry, Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, Bauru, Brazil
| | - Pedro Henrique Souza Calefi
- Post Graduation Program in Dentistry, Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, Bauru, Brazil
| | - Murilo Priori Alcalde
- Post Graduation Program in Dentistry, Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, Bauru, Brazil
| | - Marco Antonio Húngaro Duarte
- Post Graduation Program in Dentistry, Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, Bauru, Brazil
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Iacono F, Pirani C, Arias A, de la Macorra JC, Generali L, Gandolfi MG, Prati C. Impact of a modified motion on the fatigue life of NiTi reciprocating instruments: a Weibull analysis. Clin Oral Investig 2018; 23:3095-3102. [PMID: 30397734 DOI: 10.1007/s00784-018-2730-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 10/22/2018] [Indexed: 10/27/2022]
Abstract
OBJECTIVES To evaluate the impact of a modified motion on the fatigue life of four brands of nickel-titanium (NiTi) reciprocating instruments. MATERIALS AND METHODS Cyclic fatigue (CF) resistance of 160 instruments was evaluated in an artificial stainless-steel canal (90° angle, 5-mm radius of curvature). WaveOne and WaveOne Gold (Denstply Maillefer, Baillagues, Switzerland) and Reciproc and Reciproc Blue (VDW, Munich, Germany) were tested with two different motions: (1) X-Smart Plus (Denstply Maillefer) endodontic motor and (2) a 4:1 contra-angle with an experimental motion (EVO) with different rotation angles and based on a sinusoidal acceleration. Motions with X-Smart Plus and EVO were recorded and analyzed at a reduced speed with VLC Media Player software for a more accurate analysis. Mean half-life, beta, and eta Weibull parameters were determined and compared. RESULTS Reciproc Blue resulted the most resistant instruments either with EVO or X-Smart. WaveOne Gold lasted significantly longer than WaveOne with EVO (probability of 91%) while no significant differences were found with X-Smart. Considering NCF, Reciproc, WaveOne Gold, and Reciproc Blue lasted significantly longer with EVO (probabilities of 66%, 80%, and 89% respectively). WaveOne Gold showed the highest beta parameter. CONCLUSIONS The experimental motion was found to have a positive impact on fatigue lifetime of reciprocating instruments. CLINICAL RELEVANCE Current findings provide insight for future improvements in the clinical use of reciprocating files. Experimental motions may be considered when searching for additional strategies in order to increase the safer use of NiTi files during endodontic procedures.
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Affiliation(s)
- Francesco Iacono
- School of Dentistry, Endodontic Clinical Section, Master in Clinical Endodontology, Department of Biomedical and Neuromotor Sciences(DIBINEM), University of Bologna, Alma Mater Studiorum, Bologna, Italy
| | - Chiara Pirani
- School of Dentistry, Endodontic Clinical Section, Master in Clinical Endodontology, Department of Biomedical and Neuromotor Sciences(DIBINEM), University of Bologna, Alma Mater Studiorum, Bologna, Italy.
| | - Ana Arias
- Department of Conservative and Prosthetic Dentistry, School of Dentistry, Complutense University, Madrid, Spain
| | - Josè C de la Macorra
- Department of Conservative and Prosthetic Dentistry, School of Dentistry, Complutense University, Madrid, Spain
| | - Luigi Generali
- Department of Surgery, Medicine, Dentistry and Morphological Sciences with Transplant Surgery, Oncology and Regenerative Medicine Relevance (CHIMOMO), School of Dentistry, Endodontic Section, University of Modena and Reggio Emilia, Modena, Italy
| | - Maria Giovanna Gandolfi
- School of Dentistry, Endodontic Clinical Section, Master in Clinical Endodontology, Department of Biomedical and Neuromotor Sciences(DIBINEM), University of Bologna, Alma Mater Studiorum, Bologna, Italy
| | - Carlo Prati
- School of Dentistry, Endodontic Clinical Section, Master in Clinical Endodontology, Department of Biomedical and Neuromotor Sciences(DIBINEM), University of Bologna, Alma Mater Studiorum, Bologna, Italy
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Soares CJ, Rodrigues MDP, Faria-e-Silva AL, Santos-Filho PCF, Veríssimo C, Kim HC, Versluis A. How biomechanics can affect the endodontic treated teeth and their restorative procedures? Braz Oral Res 2018; 32:e76. [DOI: 10.1590/1807-3107bor-2018.vol32.0076] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Accepted: 06/13/2018] [Indexed: 11/22/2022] Open
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Gambarini G, Piasecki L, Miccoli G, Gaimari G, Di Giorgio R, Di Nardo D, Azim AA, Testarelli L. Classification and cyclic fatigue evaluation of new kinematics for endodontic instruments. AUST ENDOD J 2018; 45:154-162. [DOI: 10.1111/aej.12294] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/22/2018] [Indexed: 11/28/2022]
Affiliation(s)
- Gianluca Gambarini
- Department of Oral and Maxillo Facial Sciences Sapienza University Rome Italy
| | - Lucila Piasecki
- Division of Endodontics University at Buffalo Buffalo NY USA
| | - Gabriele Miccoli
- Department of Oral and Maxillo Facial Sciences Sapienza University Rome Italy
| | - Gianfranco Gaimari
- Department of Oral and Maxillo Facial Sciences Sapienza University Rome Italy
| | - Roberto Di Giorgio
- Department of Oral and Maxillo Facial Sciences Sapienza University Rome Italy
| | - Dario Di Nardo
- Department of Oral and Maxillo Facial Sciences Sapienza University Rome Italy
| | - Adham A Azim
- Division of Endodontics University at Buffalo Buffalo NY USA
| | - Luca Testarelli
- Department of Oral and Maxillo Facial Sciences Sapienza University Rome Italy
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Khasnis SA, Kar PP, Kamal A, Patil JD. Rotary science and its impact on instrument separation: A focused review. J Conserv Dent 2018; 21:116-124. [PMID: 29674810 PMCID: PMC5890398 DOI: 10.4103/jcd.jcd_240_17] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Revised: 11/21/2017] [Accepted: 12/17/2017] [Indexed: 11/04/2022] Open
Abstract
Efficient endodontic treatment demands thorough debridement of the root canal system with minimal procedural errors. The inherent weakness of nickel-titanium alloys is their unexpected breakage. Modifications in the design, manufacturing, thermomechanical and surface treatment of alloys and advancements in movement kinetics have shown to improve the fatigue properties of the alloys, reducing the incidence of separation. This review enlightens the impact of these factors on fatigue properties of the alloy.
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Affiliation(s)
- Sandhya Anand Khasnis
- Department of Conservative Dentistry and Endodontics, PMNM Dental College, Bagalkot, Karnataka, India
| | - Prem Prakash Kar
- Department of Conservative Dentistry and Endodontics, PMNM Dental College, Bagalkot, Karnataka, India
| | - Apoorva Kamal
- Department of Conservative Dentistry and Endodontics, PMNM Dental College, Bagalkot, Karnataka, India
| | - Jayaprakash D. Patil
- Department of Conservative Dentistry and Endodontics, PMNM Dental College, Bagalkot, Karnataka, India
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Tokita D, Ebihara A, Nishijo M, Miyara K, Okiji T. Dynamic Torque and Vertical Force Analysis during Nickel-titanium Rotary Root Canal Preparation with Different Modes of Reciprocal Rotation. J Endod 2017; 43:1706-1710. [DOI: 10.1016/j.joen.2017.05.010] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 05/19/2017] [Accepted: 05/20/2017] [Indexed: 11/25/2022]
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Özyürek T, Keskin NB, Furuncuoğlu F, İnan U. Comparison of cyclic fatigue life of nickel-titanium files: an examination using high-speed camera. Restor Dent Endod 2017; 42:224-231. [PMID: 28808639 PMCID: PMC5553022 DOI: 10.5395/rde.2017.42.3.224] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 07/05/2017] [Indexed: 11/29/2022] Open
Abstract
Objectives To determine the actual revolutions per minute (rpm) values and compare the cyclic fatigue life of Reciproc (RPC, VDW GmbH), WaveOne (WO, Dentsply Maillefer), and TF Adaptive (TFA, Axis/SybronEndo) nickel-titanium (NiTi) file systems using high-speed camera. Materials and Methods Twenty RPC R25 (25/0.08), 20 WO Primary (25/0.08), and 20 TFA ML 1 (25/0.08) files were employed in the present study. The cyclic fatigue tests were performed using a dynamic cyclic fatigue testing device, which has an artificial stainless steel canal with a 60° angle of curvature and a 5-mm radius of curvature. The files were divided into 3 groups (group 1, RPC R25 [RPC]; group 2, WO Primary [WO]; group 3, TF Adaptive ML 1 [TFA]). All the instruments were rotated until fracture during the cyclic fatigue test and slow-motion videos were captured using high-speed camera. The number of cycles to failure (NCF) was calculated. The data were analyzed statistically using one-way analysis of variance (ANOVA, p < 0.05). Results The slow-motion videos were indicated that rpm values of the RPC, WO, and TFA groups were 180, 210, and 425, respectively. RPC (3,464.45 ± 487.58) and WO (3,257.63 ± 556.39) groups had significantly longer cyclic fatigue life compared with TFA (1,634.46 ± 300.03) group (p < 0.05). There was no significant difference in the mean length of the fractured fragments. Conclusions Within the limitation of the present study, RPC and WO NiTi files showed significantly longer cyclic fatigue life than TFA NiTi file.
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Affiliation(s)
- Taha Özyürek
- Department of Endodontics, Ondokuz Mayıs University Faculty of Dentistry, Samsun, Turkey
| | | | | | - Uğur İnan
- Department of Endodontics, Ondokuz Mayıs University Faculty of Dentistry, Samsun, Turkey
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Dynamic Torsional and Cyclic Fracture Behavior of ProFile Rotary Instruments at Continuous or Reciprocating Rotation as Visualized with High-speed Digital Video Imaging. J Endod 2017; 43:1337-1342. [DOI: 10.1016/j.joen.2017.03.024] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2017] [Revised: 03/16/2017] [Accepted: 03/17/2017] [Indexed: 11/19/2022]
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12
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Chi CW, Lai EHH, Liu CY, Lin CP, Shin CS. Influence of heat treatment on cyclic fatigue and cutting efficiency of ProTaper Universal F2 instruments. J Dent Sci 2017; 12:21-26. [PMID: 30895019 PMCID: PMC6395258 DOI: 10.1016/j.jds.2016.06.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 06/06/2016] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND/PURPOSE Heat pretreatment can improve the cyclic fatigue life of nickel-titanium (NiTi) instruments. This study evaluated the effects of two different heat treatments on the cyclic fatigue resistance and cutting efficiency of ProTaper Universal F2 files. MATERIALS AND METHODS The files were divided into three groups: no treatment (control), heat treatment at 400°C (HT400) and heat treatment at 600°C (HT600). The phase transformation of the files was evaluated by differential scanning calorimetry. In cyclic fatigue tests, the differences in file performance in four simulated canals among the three groups were assessed. The cutting efficiency was tested at four cutting portions (3 mm, 6 mm, 9 mm, and 12 mm) from the tip of the file. RESULTS Differential scanning calorimetry showed a prolonged phase transformation of the files only after 600°C treatment. At 3 mm cutting portion, 400°C heat-treated files had significantly better cutting ability than those in the control group. However, the files in the HT600 group had significantly lower cutting efficiency than those in the other two groups at the four tested positions. In the cyclic fatigue test, fatigue lives of the files after 400°C and 600°C treatment were prolonged from 2.1 to 2.8 times and from 1.7 to 5.5 times, respectively. CONCLUSION Although 600°C treatment increased resistance to cyclic fatigue, it reduced the cutting efficiency of the files. The 400°C treatment maintained the cutting ability and prolonged the cyclic fatigue life of the files. Therefore, for clinical use of ProTaper Universal F2 files, 400°C pretreatment is a better choice than 600°C pretreatment.
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Affiliation(s)
- Chih-Wen Chi
- Graduate Institute of Clinical Dentistry, School of Dentistry and National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Eddie Hsiang-Hua Lai
- Graduate Institute of Clinical Dentistry, School of Dentistry and National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Chao-Yuan Liu
- Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan
| | - Chun-Pin Lin
- Graduate Institute of Clinical Dentistry, School of Dentistry and National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan.,School of Dentistry, China Medical University and China Medical University Hospital, Taichung, Taiwan
| | - Chow-Shing Shin
- Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan
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Özyürek T, Yılmaz K, Uslu G. Effect of adaptive motion on cyclic fatigue resistance of a nickel titanium instrument designed for retreatment. Restor Dent Endod 2017; 42:34-38. [PMID: 28194362 PMCID: PMC5299753 DOI: 10.5395/rde.2017.42.1.34] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 11/06/2016] [Indexed: 11/11/2022] Open
Abstract
Objectives The aim of this study was to evaluate the cyclic fatigue resistance of the ProTaper Universal D1 file (Dentsply Maillefer) under continuous and adaptive motion. Materials and Methods Forty ProTaper Universal D1 files were included in this study. The cyclic fatigue tests were performed using a dynamic cyclic fatigue testing device, which had an artificial stainless steel canal with a 60° angle of curvature and a 5 mm radius of curvature. The files were randomly divided into two groups (Group 1, Rotary motion; Group 2, Adaptive motion). The time to failure of the files were recorded in seconds. The number of cycles to failure (NCF) was calculated for each group. The data were statistically analyzed using Student's t-test. The statistical significant level was set at p < 0.05. Results The cyclic fatigue resistance of the adaptive motion group was significantly higher than the rotary motion group (p < 0.05). Conclusion Within the limitations of the present study, the ‘Adaptive motion’ significantly increased the resistance of the ProTaper Universal D1 file to cyclic facture.
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Affiliation(s)
- Taha Özyürek
- Department of Endodontics, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey
| | - Koray Yılmaz
- Department of Endodontics, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey
| | - Gülşah Uslu
- Department of Endodontics, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey
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Magalhães RRSD, Braga LCM, Pereira ÉSJ, Peixoto IFDC, Buono VTL, Bahia MGDA. The impact of clinical use on the torsional behavior of Reciproc and WaveOne instruments. J Appl Oral Sci 2016; 24:310-6. [PMID: 27556200 PMCID: PMC4990358 DOI: 10.1590/1678-775720150596] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 04/26/2016] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE The aim of this study was to assess the influence of clinical use, in vivo, on the torsional behavior of Reciproc and WaveOne instruments considering the possibility that they degraded with use. MATERIAL AND METHODS Diameter at each millimeter, pitch length, and area at 3 mm from the tip were determined for both types of instruments. Twenty-four instruments, size 25, 0.08 taper, of each system were divided into two groups (n=12 each): Control Group (CG), in which new Reciproc (RC) and WaveOne Primary (WO) instruments were tested in torsion until rupture based on ISO 3630-1; and Experimental Group (EG), in which each new instrument was clinically used to clean and shape the root canals of one molar. After clinical use, the instruments were analyzed using optical and scanning electron microscopy and subsequently tested in torsion until fracture. Data were analyzed using one-way analysis of variance at a=.05. RESULTS WO instruments showed significantly higher mean values of cross-sectional area A3 (P=0.000) and smaller pitch lengths than RC instruments with no statistically significant differences in the diameter at D3 (P=0.521). No significant differences in torsional resistance between the RC and WO new instruments (P=0.134) were found. The clinical use resulted in a tendency of reduction in the maximum torque of the analyzed instruments but no statistically significant difference was observed between them (P=0.327). During the preparation of the root canals, two fractured RC instruments and longitudinal and transversal cracks in RC and WO instruments were observed through SEM analysis. CONCLUSION After clinical use, no statistically significant reduction in the torsional resistance was observed.
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Affiliation(s)
| | - Lígia Carolina Moreira Braga
- - Universidade Federal de Minas Gerais, Faculdade de Odontologia, Departamento de Odontologia Restauradora, Belo Horizonte, MG, Brasil
| | - Érika Sales Joviano Pereira
- - Universidade Federal da Bahia, Faculdade de Odontologia, Departamento de Clínica Odontológica, Salvador, BA, Brasil
| | - Isabella Faria da Cunha Peixoto
- - Universidade Federal de Minas Gerais, Faculdade de Odontologia, Departamento de Odontologia Restauradora, Belo Horizonte, MG, Brasil
| | - Vicente Tadeu Lopes Buono
- - Universidade Federal de Minas Gerais, Faculdade de Engenharia, Departamento de Engenharia Metalúrgica e de Materiais, Belo Horizonte, MG, Brasil
| | - Maria Guiomar de Azevedo Bahia
- - Universidade Federal de Minas Gerais, Faculdade de Odontologia, Departamento de Odontologia Restauradora, Belo Horizonte, MG, Brasil
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15
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Chi CW, Deng YL, Lee JW, Lin CP. Fracture resistance of dental nickel-titanium rotary instruments with novel surface treatment: Thin film metallic glass coating. J Formos Med Assoc 2016; 116:373-379. [PMID: 27502895 DOI: 10.1016/j.jfma.2016.07.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2016] [Accepted: 07/05/2016] [Indexed: 11/27/2022] Open
Abstract
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. The characteristics of coating were analyzed by scanning electron microscopy, transmission electron microscopy, and X-ray diffractometry. In cyclic fatigue tests, the files were performed in a simulated root canal (radius=5 mm, angulation=60°) under a rotating speed of 300rpm. The fatigue fractured cross sections of the files were analyzed with their fractographic performances through scanning electron microscopy images. RESULTS The amorphous structure of the Ti-Zr-B coating was confirmed by transmission electron microscopy and X-ray diffractometry. The surface of treated files presented smooth morphologies without grinding irregularity. For the 200- and 500-nm surface treatment groups, the coated files exhibited higher resistance of cyclic fatigue than untreated files. In fractographic analysis, treated files showed significantly larger crack-initiation zone; however, no significant differences in the areas of fatigue propagation and catastrophic fracture were found compared to untreated files. CONCLUSION The novel surface treatment of Ti-Zr-B thin film metallic glass on dental NiTi rotary files can effectively improve the fatigue fracture resistance by offering a smooth coated surface with amorphous microstructure.
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Affiliation(s)
- Chih-Wen Chi
- Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University, Taipei City, Taiwan; National Taiwan University Hospital Hsin-Chu Branch, College of Medicine, National Taiwan University, Hsin-Chu, Taiwan
| | - Yu-Lun Deng
- Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, Taiwan
| | - Jyh-Wei Lee
- Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, Taiwan; Center for Thin Films Technologies and Applications, Ming Chi University of Technology, New Taipei, Taiwan; College of Engineering, Chang Gung University, Taoyuan, Taiwan.
| | - Chun-Pin Lin
- Graduate Institute of Clinical Dentistry, School of Dentistry, National Taiwan University, Taipei City, Taiwan; National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan; School of Dentistry, China Medical University and China Medical University Hospital, Taichung, Taiwan.
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16
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Plotino G, Ahmed HMA, Grande NM, Cohen S, Bukiet F. Current Assessment of Reciprocation in Endodontic Preparation: A Comprehensive Review—Part II: Properties and Effectiveness. J Endod 2015; 41:1939-50. [DOI: 10.1016/j.joen.2015.08.018] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Karataş E, Arslan H, Büker M, Seçkin F, Çapar ID. Effect of movement kinematics on the cyclic fatigue resistance of nickel-titanium instruments. Int Endod J 2015; 49:361-4. [DOI: 10.1111/iej.12453] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 03/24/2015] [Indexed: 11/26/2022]
Affiliation(s)
- E. Karataş
- Department of Endodontics; Faculty of Dentistry; Ataturk University; Erzurum Turkey
| | - H. Arslan
- Department of Endodontics; Faculty of Dentistry; Ataturk University; Erzurum Turkey
| | - M. Büker
- Department of Endodontics; Faculty of Dentistry; Ataturk University; Erzurum Turkey
| | - F. Seçkin
- Department of Endodontics; Faculty of Dentistry; Ataturk University; Erzurum Turkey
| | - I. D. Çapar
- Department of Endodontics; Faculty of Dentistry; Katip Çelebi University; İzmir Turkey
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18
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Tang WR, Smales RJ, Chen HF, Guo XY, Si HY, Gao LM, Zhou WB, Wu YN. Prevention and management of fractured instruments in endodontic treatment. World J Surg Proced 2015; 5:82-98. [DOI: 10.5412/wjsp.v5.i1.82] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 12/12/2014] [Accepted: 01/12/2015] [Indexed: 02/06/2023] Open
Abstract
Intracanal instrument fracture is an unpredictable and problematic occurrence that can prevent adequate cleaning and shaping procedures and influence the prognosis of endodontic treatment. The prevalence of instrument fracture is reported to range between 0.28% and 16.2%. This article presents an overview of the prevention and management of instruments fractured during endodontic therapy on the basis of literature retrieved from PubMed and selected journal searches. Instrument fracture occurs because of reduced metal fatigue and/or torsional resistance. The reasons include canal morphology and curvature, manufacturing processes and instrument design, instrument use times and technique, rotational speeds and operator experience. With the development of various equipment and techniques, most of the retained instrument separations can be removed safely. However, in canals without associated periapical disease not every fractured separation should be removed from difficult locations because of the increased risk for root perforation and fracture. In difficult cases, either retain or bypass the fragment in the root canal and ensure regular follow-up reviews. Fractured instruments retained in the presence of periapical disease reduce significantly the prognosis of endodontically treated teeth, indicating a greater need to attempt the removal or bypass of the file separations. Apical surgery might be required in some instances, emphasizing the importance of preventing instrument fracture.
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Çapar ID, Arslan H. A review of instrumentation kinematics of engine-driven nickel-titanium instruments. Int Endod J 2015; 49:119-35. [PMID: 25630977 DOI: 10.1111/iej.12432] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 01/24/2015] [Indexed: 10/24/2022]
Abstract
Over the years, NiTi alloys have become indispensable materials in endodontic treatment. With technological advancements in metallurgy, manufacturers have attempted to produce instruments with enhanced features. In parallel with these developments, endodontic motors have undergone improvements in terms of torque control and kinematics that are adjustable in different directions. This review presents an overview of the advancements in instrumentation kinematics and the effect of instrumentation kinematics on root canal shaping procedures and instrument performance. The literature search for this narrative review was conducted in Google Scholar, Scopus, PubMed and Web of Science using the keywords 'kinematics and endodontics' and 'reciprocation and endodontics'. In addition, historical literature was searched using the keyword 'nickel-titanium and endodontics'. Overall, 143 articles were included up to 2015.
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Affiliation(s)
- I D Çapar
- Department of Endodontics, Faculty of Dentistry, İzmir Katip Çelebi University, İzmir, Turkey
| | - H Arslan
- Department of Endodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey
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