Insights on the chemical ageing of acrylic reline resins

Detalhes bibliográficos
Autor(a) principal: Alexandre, Fábia Aurélia Vieira
Data de Publicação: 2016
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/26134
Resumo: Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2016
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spelling Insights on the chemical ageing of acrylic reline resinsMateriais dentáriosResinas acrílicasClorexidinaTeses de mestrado - 2016Domínio/Área Científica::Ciências Médicas::Medicina ClínicaTese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2016The main purpose of this study was to evaluate the effect of chemical ageing on the chlorhexidine release and color stability of three acrylic reline resins – Kooliner, Probase Cold and Ufi Gel Hard, loaded with chlorhexidine. For each material, control group and chlorhexidine 1% and 2.5% (w/w) experimental groups (n=5) were produced. They were placed in artificial saliva and submitted to three different protocols of chemical ageing: a) at pH 7; b) cycles of 6h at pH 5 interchanching with 18h at pH 7; c) cycles of 6h at pH 3 interchanching with 18h at pH 7. A total of 135 specimens were evaluated in this study. The saliva samples were analyzed by UV spectroscopy and chlorhexidine content was determined. Color measurements were performed before and after the release study, using a spectrophotometer. The values registred were converted to CieLab system, and the overall color change (ΔE) was calculated and converted to NBS (National Bureau of Standards) units, to denote the color differences in a clinical perspective. Data were submitted to Kruskall-Wallis tests (p<0.05), followed by multiple comparisons by Mann-Whitney test with Bonferroni correction. When subjected to acid conditions, all acrylic reline resins had a higher drug release. At pH 5 and 7, the pattern of release of Kooliner and Ufi Gel Hard was similar and Probase Cold revealed the lowest amounts of chlorhexidine released. Results of color stability demonstrated that all samples showed a color alteration. There were no differences between the three release media, but it was affected by different acrylic reline resins composition. Kooliner showed the highest color change, followed by Probase Cold and Ufi Gel Hard. Chlorhexidine incorporation leaded to a higher color change.Neves, Maria Cristina Bettencourt, 1976-Bettencourt, Ana FranciscaRepositório da Universidade de LisboaAlexandre, Fábia Aurélia Vieira2017-01-23T16:14:05Z201620162016-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10451/26134TID:201289474enginfo: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:RCAAP2023-11-08T16:16:00Zoai:repositorio.ul.pt:10451/26134Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:42:51.242933Repositório 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 Insights on the chemical ageing of acrylic reline resins
title Insights on the chemical ageing of acrylic reline resins
spellingShingle Insights on the chemical ageing of acrylic reline resins
Alexandre, Fábia Aurélia Vieira
Materiais dentários
Resinas acrílicas
Clorexidina
Teses de mestrado - 2016
Domínio/Área Científica::Ciências Médicas::Medicina Clínica
title_short Insights on the chemical ageing of acrylic reline resins
title_full Insights on the chemical ageing of acrylic reline resins
title_fullStr Insights on the chemical ageing of acrylic reline resins
title_full_unstemmed Insights on the chemical ageing of acrylic reline resins
title_sort Insights on the chemical ageing of acrylic reline resins
author Alexandre, Fábia Aurélia Vieira
author_facet Alexandre, Fábia Aurélia Vieira
author_role author
dc.contributor.none.fl_str_mv Neves, Maria Cristina Bettencourt, 1976-
Bettencourt, Ana Francisca
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Alexandre, Fábia Aurélia Vieira
dc.subject.por.fl_str_mv Materiais dentários
Resinas acrílicas
Clorexidina
Teses de mestrado - 2016
Domínio/Área Científica::Ciências Médicas::Medicina Clínica
topic Materiais dentários
Resinas acrílicas
Clorexidina
Teses de mestrado - 2016
Domínio/Área Científica::Ciências Médicas::Medicina Clínica
description Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2016
publishDate 2016
dc.date.none.fl_str_mv 2016
2016
2016-01-01T00:00:00Z
2017-01-23T16:14:05Z
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/10451/26134
TID:201289474
url http://hdl.handle.net/10451/26134
identifier_str_mv TID:201289474
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
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