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Maria Guiomar de Azevedo Bahiahttp://lattes.cnpq.br/4704577372216652Vicente Tadeu Lopes Buonohttp://lattes.cnpq.br/0176931310509841Rafael Rodrigues Soares de Magalhães2020-01-09T17:31:39Z2020-01-09T17:31:39Z2014-07-31http://hdl.handle.net/1843/31782As propriedades mecânicas dos instrumentos endodônticos são afetadas por fatores como diâmetro, design, composição química, e tratamentos termomecânicos aplicados durante o processo de fabricação. O objetivo deste trabalho foi avaliar a flexibilidade e a resistência torcional de instrumentos de NiTi Reciproc (RC), Wave One (WO) e ProTaper Universal (PTU), novos e após o uso clínico. A composição química dos instrumentos foi analisada por espectroscopia de energia de raios X (EDS), as fases presentes identificadas por difração de raios X (DRX) e as temperaturas de transformação determinadas por calorimetria exploratória diferencial (DSC). Imagens das seções longitudinal e transversal foram empregadas para determinar o diâmetro e a área a 3 mm da ponta (D3 e A3), posição onde as solicitações mecânicas se concentram durante o uso clínico e os instrumentos são apreendidos nos testes. O comportamento mecânico foi avaliado através de ensaios de flexão e torção até a ruptura, de acordo com a especificação ISO 3630-1. Os instrumentos RC, WO e PTU apresentaram composição química semelhante e fase β como principal constituinte à temperatura ambiente. No entanto, os instrumentos Reciproc e WaveOne apresentaram um aumento relevante nas temperaturas de transformação, sugerindo a presença da fase B19’, coexistindo com a fase austenítica. Apesar de apresentarem D3 semelhantes, a análise estatística dos valores de A3 entre os pares de instrumentos analisados mostrou diferença significativamente menor para os instrumentos RC. Os instrumentos RC foram significativamente mais flexíveis, possivelmente devido ao tratamento termomecânico a que foram submetidos os fios utilizados na fabricação dos mesmos (MWire), além da morfologia de sua sessão tranversal, seguidos por WO, que também são fabricados a partir do fio M-Wire, e PTU, nesta ordem. Dentre os instrumentos novos, os PTU apresentaram valores de torque máximo, quando ensaiados em torção, significativamente menores. Os instrumentos PTU apresentaram os maiores valores de deflexão angular, seguidos pelos instrumentos RC e WO, nesta ordem. Todos os sistemas após serem utilizados na prática clínica apresentaram redução da resistência torcional. Entretanto, a comparação estatística entre os valores de torque máximo para os instrumentos novos e após uso clínico, não apresentou diferença estatisticamente significativa para nenhum dos sistemas avaliados. Com relação à deflexão angular, a comparação entre instrumentos novos e após uso clínico, mostra uma redução dos valores desse parâmetro após o uso clínico, com exceção dos instrumentos RC. Entretanto, as análises estatísticas mostraram não haver diferenças significativas entre os pares de instrumentos analisados.The mechanical properties of the endodontic instruments are affected by factors such as diameter, design, chemical composition and thermo-mechanical treatments applied during the manufacturing process. The main goal of this study was to assess the flexibility and torsional resistance of the NiTi Reciproc (RC), Wave One (WO) and ProTaper Universal (PTU) instruments, new and after clinical use. The instruments chemical composition was analyzed with X-Ray energy spectroscopy (EDS), the present phases were determined by X-Ray Diffractions (DRX) and the transformation temperatures were obtained with differential scanning calorimeter (DSC). Images from the longitudinal and transversal sections were used for determining the diameter and the area at 3mm from the tip (D3 and A3), the position where the mechanical requests are focused in clinical use and where the instruments are apprehended during the tests. The mechanical behavior has been evaluated through simulation of bending and torsion until rupture according to ISO 3630-1. The RC, WO and PTU instruments have presented a similar chemical composition with the predominance of β phase at room temperature. However, Reciproc and Waveone instruments showed a significant increase in transformation temperatures, suggesting the presence of B19 phase, coexisting with the austenitic phase Despite showing similar D3, statistical analysis of the values of A3 between pairs of instruments analyzed showed significantly lower difference for RC instruments. The RC instruments were significantly more flexible, possibly due to the thermomechanical treatment applied to the wire (M-Wire) used in their manufacture process in addition to their cross section design, followed by WO instruments, which are also made of M-Wire, and PTU instruments, in that order. Among the new instruments, PTU showed significantly lower maximum torque values in torsion tests. PTU instruments presented the highest angular deflection values, followed by RC and WO instruments, in that order. All systems reduced their torsional strength after clinical use. However, statistical comparison between the maximum torque values for new and after clinical use instruments, showed no statistically significant difference for any of the evaluated systems. Regarding the angular deflection, the comparison between new and after clinical use instruments demonstrated a reduction of the values of this parameter after clinical use, with the exception of RC instruments. However, statistical analysis showed no significant differences between the pairs of instruments analyzed.porUniversidade Federal de Minas GeraisPrograma de Pós-Graduação em OdontologiaUFMGBrasilODONTO - FACULDADE DE ODONTOLOGIAInstrumentos odontológicosMaleabilidadeResistência de materiaisEndodontiaCavidade pulparInstrumentos de NiTiFlexibilidadeResistência à torçãoRecíprocoInfluência do movimento recíproco na resistência à torção dos instrumentos de NiTi: Reciproc, WaveOne, e ProTaper UniversalInfluence of reciprocial movement on resistance to tortion of NITI instruments: Reciproc, Waveone, e ProTaper Universalinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFMGinstname:Universidade Federal de Minas Gerais (UFMG)instacron:UFMGTEXTTese_Rafael_Magalhães_PDF.pdf.txtTese_Rafael_Magalhães_PDF.pdf.txtExtracted texttext/plain190066https://repositorio.ufmg.br/bitstream/1843/31782/3/Tese_Rafael_Magalh%c3%a3es_PDF.pdf.txt0a0c18a8fd6a5c92242d879967f68a2aMD53ORIGINALTese_Rafael_Magalhães_PDF.pdfTese_Rafael_Magalhães_PDF.pdfapplication/pdf6985442https://repositorio.ufmg.br/bitstream/1843/31782/1/Tese_Rafael_Magalh%c3%a3es_PDF.pdf50b02f0ed7fc3026a72444d9fc2332c4MD51LICENSElicense.txtlicense.txttext/plain; charset=utf-82119https://repositorio.ufmg.br/bitstream/1843/31782/2/license.txt34badce4be7e31e3adb4575ae96af679MD521843/317822020-01-24 16:40:40.01oai:repositorio.ufmg.br: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Repositório InstitucionalPUBhttps://repositorio.ufmg.br/oaiopendoar:2020-01-24T19:40:40Repositório Institucional da UFMG - Universidade Federal de Minas Gerais (UFMG)false
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