Comparative analysis of cyclic fatigue of hyflex EDMtm instruments with and without sodium hypochlorite

Detalhes bibliográficos
Autor(a) principal: Andrade, Catarina Fernandes
Data de Publicação: 2017
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/29945
Resumo: Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2017
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spelling Comparative analysis of cyclic fatigue of hyflex EDMtm instruments with and without sodium hypochloriteEndodontiaMateriais dentáriosFadigaTeses de mestrado - 2017Domínio/Área Científica::Ciências Médicas::Medicina ClínicaTese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2017INTRODUCTION: Nickel-titanium files were introduced to overcome some undesirable features of stainless steel instruments. These flexible rotary instruments have enhanced endodontic practice. Shaping and cleaning with sodium hypochlorite are responsible for eliminating microorganisms in an infected root canal system. The aim of this study was to compare cyclic fatigue resistance between, as fabricated, files in presence and absence of sodium hypochlorite. MATERIAL AND METHODS: Twenty Hyflex EDMTM files were divided in 2 groups: 10 files were tested in presence of sodium hypochlorite and 10 files were tested in its absence. A mechanical device was used to simulate the root canal system, and, to compare our data with a previous study, the same experimental parameters were followed. The testing time was registered with a digital chronometer until fracture occurred. The temperature of the files (n=2) was measured at the beginning of the essays and after 5 and 10 minutes. The number of cycles to fracture (NCF) was calculated by multiplying time by rotational speed. The normality was tested with the Shapiro-Wilk and the Levene tests, differences between groups regarding NCF were analysed using a t-student test for unequal variances. A Mann-Whitney U test was used to analyse differences between groups regarding fracture length. Additionally, Spearman’s correlation coefficient was computed after plotting fracture length against NCF. The level of statistical significance was set at 0.05. RESULTS: There was no statistically difference related to NCF/time to fracture between groups. Length of the fractured fragments was also similar between groups. Both groups showed that the higher the NCF was, the smaller the length of fracture, presenting a statistically significant result. DISCUSSION AND CONCLUSION: Within the limitations of this study, results suggest that fatigue life is similar in both groups. A standardisation in cyclic fatigue tests is required to obtain consistent results and for a safer clinical use.Ginjeira, António Manuel Pinto, 1958-Martins, RuiRepositório da Universidade de LisboaAndrade, Catarina Fernandes2017-12-12T15:41:01Z201720172017-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10451/29945TID:201748487enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-08T16:22:02Zoai:repositorio.ul.pt:10451/29945Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:45:34.248294Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Comparative analysis of cyclic fatigue of hyflex EDMtm instruments with and without sodium hypochlorite
title Comparative analysis of cyclic fatigue of hyflex EDMtm instruments with and without sodium hypochlorite
spellingShingle Comparative analysis of cyclic fatigue of hyflex EDMtm instruments with and without sodium hypochlorite
Andrade, Catarina Fernandes
Endodontia
Materiais dentários
Fadiga
Teses de mestrado - 2017
Domínio/Área Científica::Ciências Médicas::Medicina Clínica
title_short Comparative analysis of cyclic fatigue of hyflex EDMtm instruments with and without sodium hypochlorite
title_full Comparative analysis of cyclic fatigue of hyflex EDMtm instruments with and without sodium hypochlorite
title_fullStr Comparative analysis of cyclic fatigue of hyflex EDMtm instruments with and without sodium hypochlorite
title_full_unstemmed Comparative analysis of cyclic fatigue of hyflex EDMtm instruments with and without sodium hypochlorite
title_sort Comparative analysis of cyclic fatigue of hyflex EDMtm instruments with and without sodium hypochlorite
author Andrade, Catarina Fernandes
author_facet Andrade, Catarina Fernandes
author_role author
dc.contributor.none.fl_str_mv Ginjeira, António Manuel Pinto, 1958-
Martins, Rui
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Andrade, Catarina Fernandes
dc.subject.por.fl_str_mv Endodontia
Materiais dentários
Fadiga
Teses de mestrado - 2017
Domínio/Área Científica::Ciências Médicas::Medicina Clínica
topic Endodontia
Materiais dentários
Fadiga
Teses de mestrado - 2017
Domínio/Área Científica::Ciências Médicas::Medicina Clínica
description Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2017
publishDate 2017
dc.date.none.fl_str_mv 2017-12-12T15:41:01Z
2017
2017
2017-01-01T00:00:00Z
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/10451/29945
TID:201748487
url http://hdl.handle.net/10451/29945
identifier_str_mv TID:201748487
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:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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