Comparative analysis of cyclic fatigue between new and clinically used protaper next TM instruments

Detalhes bibliográficos
Autor(a) principal: Quaresma, Patrícia Simões
Data de Publicação: 2015
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Texto Completo: http://hdl.handle.net/10451/25532
Resumo: Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2015
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spelling Comparative analysis of cyclic fatigue between new and clinically used protaper next TM instrumentsEndodontiaMateriais dentáriosMateriais dentáriosFadigaTeses de mestrado - 2015Domínio/Área Científica::Ciências Médicas::Medicina ClínicaTese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2015INTRODUCTION: NiTi instruments were introduced in endodontic instrumentation to overcome the disadvantages of stainless steel files. However, it seems that these files exhibit a higher risk of intra-operative fracture, compromising the outcome of endodontic treatment. The aim of this study is to compare cyclic fatigue resistance between clinically used and new files. MATERIAL AND METHODS: Twenty-six clinically used ProTaper NextTM files were analyzed. The sample was 9 files of X1, 8 of X2 and 9 of X3. A mechanical device was used to simulate the root canal system and, to compare our data with a previous study, the same parameters were followed. The testing time was registered with a digital chronometer until tip separation occurred. The number of cycles to fracture was calculated multiplying time by rotational speed. Data obtained was statistically analyzed by Mann-Whitney U and Kruskal-Wallis tests or t-student test taking into account the results of the normality tests previously applied. Significance was set at the 95% confidence level. RESULTS: X1 instrument proved to be statistically more resistant to cyclic fatigue than X2 and X3, respectively. X3 was the only file that showed a significant decrease in the resistance after clinical use. The local of fracture of used and new files was statistically different. DISCUSSION AND CONCLUSIONS: Within the limitations of this study, the results suggest that resistance to fatigue life diminish after various clinical uses and all instruments should be checked carefully before each use. A single use should be considered in more complex cases. A lower resistance to cyclic fatigue in larger instruments was also shown, so these files should be used with greater care. There is a need for standardization in cyclic fatigue tests of endodontic instruments to ensure the uniformity of methodology and comparable results for a safer clinical use.Ginjeira, António Manuel Pinto, 1958-Martins, Rui F.Repositório da Universidade de LisboaQuaresma, Patrícia Simões2016-12-29T11:32:09Z201520152015-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10451/25532TID:201274043enginfo:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-03-17T13:33:35Zoai:repositorio.ulisboa.pt:10451/25532Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-29T02:47:46.717544Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Comparative analysis of cyclic fatigue between new and clinically used protaper next TM instruments
title Comparative analysis of cyclic fatigue between new and clinically used protaper next TM instruments
spellingShingle Comparative analysis of cyclic fatigue between new and clinically used protaper next TM instruments
Quaresma, Patrícia Simões
Endodontia
Materiais dentários
Materiais dentários
Fadiga
Teses de mestrado - 2015
Domínio/Área Científica::Ciências Médicas::Medicina Clínica
title_short Comparative analysis of cyclic fatigue between new and clinically used protaper next TM instruments
title_full Comparative analysis of cyclic fatigue between new and clinically used protaper next TM instruments
title_fullStr Comparative analysis of cyclic fatigue between new and clinically used protaper next TM instruments
title_full_unstemmed Comparative analysis of cyclic fatigue between new and clinically used protaper next TM instruments
title_sort Comparative analysis of cyclic fatigue between new and clinically used protaper next TM instruments
author Quaresma, Patrícia Simões
author_facet Quaresma, Patrícia Simões
author_role author
dc.contributor.none.fl_str_mv Ginjeira, António Manuel Pinto, 1958-
Martins, Rui F.
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Quaresma, Patrícia Simões
dc.subject.por.fl_str_mv Endodontia
Materiais dentários
Materiais dentários
Fadiga
Teses de mestrado - 2015
Domínio/Área Científica::Ciências Médicas::Medicina Clínica
topic Endodontia
Materiais dentários
Materiais dentários
Fadiga
Teses de mestrado - 2015
Domínio/Área Científica::Ciências Médicas::Medicina Clínica
description Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2015
publishDate 2015
dc.date.none.fl_str_mv 2015
2015
2015-01-01T00:00:00Z
2016-12-29T11:32:09Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10451/25532
TID:201274043
url http://hdl.handle.net/10451/25532
identifier_str_mv TID:201274043
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
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