A metallurgical characterization of ten endodontic Ni‐Ti instruments: assessing the clinical relevance of shape memory and superelastic properties of Ni‐Ti endodontic instruments

Zinelis, Spiros; Eliades, Theodore; Εliades, George

doi:10.1111/j.1365-2591.2009.01651.x

Cited by 106 publications

(114 citation statements)

References 40 publications

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“…HyFlex instruments made from CM Wire were commercialized in 2011. They exhibit a lower percent in weight of nickel (52 Ni %wt) than the common 54.5-57 Ni %wt of the great majority of commercially available SE NiTi rotary instruments (101). The recommended rotational speed is 500 rpm with a torque setting of up to 2.5 N/cm (www.…”

Section: Hyflex and Typhoon CM Instrumentsmentioning

confidence: 99%

Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

Shen

Zhou

Zheng

et al. 2013

Journal of Endodontics

451

438

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Introduction: The performance and mechanical properties of nickel-titanium (NiTi) instruments are influenced by factors such as cross-section, flute design, raw material, and manufacturing processes. Many improvements have been proposed by manufacturers during the past decade to provide clinicians with safer and more efficient instruments. Methods: The mechanical performance of NiTi alloys is sensitive to their microstructure and associated thermomechanical treatment history. Heat treatment or thermal processing is one of the most fundamental approaches toward adjusting the transition temperature in NiTi alloy, which affects the fatigue resistance of NiTi endodontic files. The newly developed NiTi instruments made from controlled memory wire, M-Wire (Dentsply Tulsa Dental Specialties, Tulsa, OK), or R-phase wire represent the next generation of NiTi alloys with improved flexibility and fatigue resistance. The advantages of NiTi files for canal cleaning and shaping are decreased canal transportation and ledging, a reduced risk of file fracture, and faster and more efficient instrumentation. The clinician must understand the nature of different NiTi raw materials and their impact on instrument performance because many new instruments are introduced on a regular basis. Results: This review summarizes the metallurgical properties of next-generation NiTi instruments, the impact of thermomechanical treatment on instrument flexibility, and the resistance to cyclic fatigue and torsion. Conclusions: The aim of this review was to provide clinicians with the knowledge necessary for evidence-based practices, maximizing the benefits from the selection and application of NiTi rotary instruments for root canal treatment. (J Endod 2013;39:163-172)

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Section: Hyflex and Typhoon CM Instrumentsmentioning

confidence: 99%

Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

Shen

Zhou

Zheng

et al. 2013

Journal of Endodontics

451

438

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“…The EDX allows to determine the composition and distribution of chemical elements in different materials and has been increasingly used in endodontics. 12,14,15,23 In our sample, the presence of chemical elements was relatively low. One explanation for this could be that only the distal canals of mandibular molars were analyzed, and these canals are usually wide and proximally Graph 1: Chemical characterization of metallic fragments found on the surface of the dentinal walls of root canals in the K-FlexoFile groups 24 Previous studies 25,26 had already reported that endodontic instruments usually do not touch all dentinal walls of wide, flattened canals during the shaping process.…”

Section: Discussionmentioning

confidence: 99%

“…Zinelis et al 15 observed that the elemental composition of most NiTi instruments ranged from 54.5 to 57% for nickel weight, which is within limits established for NiTi alloys used for medical applications. 17 The defects found in the instruments used in this study are probably due to fabrication defects that are inherent to NiTi 17 and stainless steel files.…”

Section: Discussionmentioning

confidence: 99%

“…13 The NiTi instruments, in turn, are comprised of approximately 54.2-57% of nickel and 44-45% of titanium. [14][15][16] Despite the large number of investigations about the use of these instruments, few studies have assessed the presence of metallic chemical elements on dentinal walls following root canal preparation. These chemical elements could impair the adhesion of endodontic sealers to dentinal walls and obliterate dentinal tubules, in addition to eventually reaching periapical tissues.…”

Section: Jcdpmentioning

confidence: 99%

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Presence of Metallic Microfragments on Dentinal Walls and Instrument Defects following Root Canal Preparation

Estrela

Decúrcio

Barletta

et al. 2017

The Journal of Contemporary Dental Practice

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Aim:To determine the presence of metallic microfragments and their elemental composition in the dentinal walls of root canals following preparation using different endodontic instruments and to assess the active cutting edges of instruments with regard to structural defects. Materials and methods:A total of 108 molar teeth were selected and prepared using different endodontic instruments. Teeth were randomly divided into nine groups of 12 teeth each, according to the instruments employed: Manual systems -K-FlexoFile, K-File, and Hedstroem; rotary systems -ProTaper Next, Mtwo, BioRaCe; and reciprocating systems -Reciproc, Unicone, and WaveOne. Both root canals and instruments were assessed using scanning electron microscopy, and the elemental composition of metallic microfragments was determined using energy-dispersive X-ray spectroscopy.Results: Metallic microfragments were found in the groups prepared with both manual and reciprocating instruments, with no statistically significant differences between groups, thirds, or presence of metallic microfragments (p ≥ 0.05). Moreover, all groups presented structural defects in both new and used instruments; however, rotary instruments (ProTaper Next, Mtwo 702, BioRaCe) were the ones with the lowest number of defects, at statistically significant differences in comparison with other instruments (p < 0.05). Conclusion:The presence of metallic microfragments on dentinal walls following root canal preparation was associated with Considering the outcomes measured in this study, rotary instruments performed better than the other two groups, as they were associated with the lowest number of metallic microfragments and structural defects. Presence of Metallic Microfragments on Dentinal Walls and Instrument Defects following Root Canal PreparationClinical significance: During root canal preparation, operative procedures may induce changes to the root canal shape, as well as the release of metallic fragments resulting from the action of instruments on dentinal walls. Therefore, it is important to determine, among the different techniques used for this purpose, which ones are least susceptible to this occurrence.

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“…Durante esse processo, não deve ocorrer nenhuma transformação de fase e o resfriamento não pode ser induzido. Zinelis et al (2010) demonstraram que a superelasticidade (SE) das ligas de NiTi é perdida se essas não forem submetidas a um tratamento térmico adequado.…”

Section: Tratamentos Térmicos Das Ligas De Nitiunclassified

Avaliação da influência do hipoclorito de sódio na qualidade da superfície e resistência à corrosão de limas de NiTi de diferentes procedências

Franco¹

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Aos meus pais, Regina e Manoel, por acreditarem em mim e ensinarem o verdadeiro significado da palavra família. Obrigada por todo apoio, compreensão, luta, sacrifício e dificuldades que passaram para este sonho se realizasse. Serei eternamente grata! A minha adorada e querida Vó, Adelia Rocha (in memorium), pelo amor incondicional, por me ensinar com muita sabedoria que o mais importante na vida é ter coragem e nunca desanimar ou desistir diante das dificuldades e obstáculos.Muito obrigada! Aos meus irmãos, Rodrigo e Graziella, pelo apoio, amizade, conselhos, por acreditarem em mim e me ensinar todos os dias a importância da partilha e amor fraterno. Vocês são essenciais e insubstituíveis na minha vida! As minhas irmãs de coração, Carolina e Bárbara, pela amizade, confiança, carinho e presença constante em minha vida e, pelo incentivo quando o sacrifico era grande. AGRADECIMENTOS ESPECIAISA Profa. Dra. Elaine Manso Oliveira Franco de Carvalho sem dúvidas, grande incentivadora e responsável por essa conquista. Obrigada por acreditar e me ajudar! Ao Prof. Dr. José Luiz Lage-Marques pela confiança e oportunidades.Ao Prof. Dr. João Humberto Antoniazzi pela paciência, sabedoria, humildade, dedicação me ensinando o que realmente significa ser um Professor, um Orientador e principalmente um Amigo. Sinto-me muito honrada e privilegiada por ter sido sua orientada.A Profa. Dra Neusa Alonso-Falleiros ser humano admirável com condutas profissionais e pessoais exemplares. Obrigada pela convivência e ensinamentos neste período, com certeza o carinho é verdadeiro e eterno.Ao Prof. Dr. Giulio Gavini por toda atenção, compreensão e orientação.Ao Prof. Dr. Isaac Jamil Sayed pela paciência e empenho para que tudo saísse da melhor maneira buscando sempre a excelência e se preocupando com os detalhes na obtenção das imagens. Muito obrigada, sua ajuda foi fundamental! Ao Carlos, por toda dedicação, atenção e companheirismo que mesmo longe sempre esteve presente e disposto a ajudar. AGRADECIMENTOSÀ Deus por estar sempre presente na minha vida e colocar pessoas tão especiais que de alguma forma contribuíram para a conclusão deste trabalho.A amiga Eliana Souza por todos ensinamentos, amizade, conselhos e inspiração para sempre seguir adiante Ao Leonardo e Nathalia pela amizade e por todos conselhos. ABSTRACTThe present paper evaluated the influence of 1% and 2.5% sodium hypochlorite in the quality of the surface finishing and resistance to corrosion of two endodontic files: Ten from the twenty instruments were individually fixed by the handle to a copper wire tip (0.12 mm diameter and 20 cm length) and placed in the interior of an electrochemical cell with 500 mL sodium hypochlorite solution (NaCIO) 1% (Fórmula e Ação) at the environment temperature controlled in 23ºC (±2) until covering the active part of the instrument. Recordings were made with a PAR potentiostat model 273A. The test was repeated in the same pattern to the other ten files from the same commercial brand with NaClO 2.5%. Besides EPPC, the files were submitted to the s...

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A metallurgical characterization of ten endodontic Ni‐Ti instruments: assessing the clinical relevance of shape memory and superelastic properties of Ni‐Ti endodontic instruments

Abstract: The endodontic instruments tested were manufactured from cold worked Ni-Ti wires and thus have neither shape memory nor superelastic properties.

Cited by 106 publications

References 40 publications

Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

Presence of Metallic Microfragments on Dentinal Walls and Instrument Defects following Root Canal Preparation

Avaliação da influência do hipoclorito de sódio na qualidade da superfície e resistência à corrosão de limas de NiTi de diferentes procedências

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