Shear bond strength of orthodontic brackets to fluorosed enamel

Detalhes bibliográficos
Autor(a) principal: Mendes, Mónica
Data de Publicação: 2014
Outros Autores: Portugal, Jaime, Oliveira, Sofia Arantes e, Mesquita, Pedro
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/35300
Resumo: Objectives: To evaluate the influence of dental fluorosis and etching time on the shear bondstrengths (SBSs) of orthodontic brackets to human enamel.Methods: A total of 48 human maxillary central incisors, extracted for periodontal reasonswere used. The sample was divided into three experimental groups (n = 16): group H30 withhealthy teeth and group F30 and F60 with fluorosed teeth (Thylstrup and Fejerskov Indexscores 3–4). After etching the dental enamel with 35% phosphoric acid for 30 s (groups H30and F30) or for 60 s (group F60), metal orthodontic brackets were bonded with TransbondXT adhesive system and light cured (1200 mW/cm2for 10 s). The specimens were thenthermocycled (5–55◦C, 500 cycles), stored in distilled water (37◦C/7 days), and tested inshear (Instron, 1KN, 1 mm/min). Failure mode was classified, with a stereomicroscope (20×magnification), according to the adhesive remnant index (ARI). SBS data were statisticallyanalyzed with 1-way ANOVA, followed by Tukey post hoc tests (˛a= 0.05). Kruskal–Wallis andMann–Whitney nonparametric tests were used to analyze failure data (˛a= 0.05).Results: No statistically significant (p = 0.763) differences were found between F30 and F60,but these groups showed a statistically (p < 0.05) lower bond strength values than H30. Thenon-fluorosed group showed a significantly (p < 0.05) higher ARI score than the other groups.Conclusion: Orthodontic brackets adhesion to enamel is negatively influenced by dental fluo-rosis. Doubling the etching time in fluorosed teeth was not enough to produce similar resultsto those observed in the healthy ones.
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spelling Shear bond strength of orthodontic brackets to fluorosed enamelDental fluorosisAcid etchingOrthodontic bracketsShear strengthDental bondingObjectives: To evaluate the influence of dental fluorosis and etching time on the shear bondstrengths (SBSs) of orthodontic brackets to human enamel.Methods: A total of 48 human maxillary central incisors, extracted for periodontal reasonswere used. The sample was divided into three experimental groups (n = 16): group H30 withhealthy teeth and group F30 and F60 with fluorosed teeth (Thylstrup and Fejerskov Indexscores 3–4). After etching the dental enamel with 35% phosphoric acid for 30 s (groups H30and F30) or for 60 s (group F60), metal orthodontic brackets were bonded with TransbondXT adhesive system and light cured (1200 mW/cm2for 10 s). The specimens were thenthermocycled (5–55◦C, 500 cycles), stored in distilled water (37◦C/7 days), and tested inshear (Instron, 1KN, 1 mm/min). Failure mode was classified, with a stereomicroscope (20×magnification), according to the adhesive remnant index (ARI). SBS data were statisticallyanalyzed with 1-way ANOVA, followed by Tukey post hoc tests (˛a= 0.05). Kruskal–Wallis andMann–Whitney nonparametric tests were used to analyze failure data (˛a= 0.05).Results: No statistically significant (p = 0.763) differences were found between F30 and F60,but these groups showed a statistically (p < 0.05) lower bond strength values than H30. Thenon-fluorosed group showed a significantly (p < 0.05) higher ARI score than the other groups.Conclusion: Orthodontic brackets adhesion to enamel is negatively influenced by dental fluo-rosis. Doubling the etching time in fluorosed teeth was not enough to produce similar resultsto those observed in the healthy ones.Objetivos: Avaliar a influência da fluorose e do tempo de condicionamento ácido sobre a resistência adesiva ao corte de brackets ortodônticos colados ao esmalte.Métodos: 48 incisivos centrais maxilares humanos, extraídos por razões periodontais, e divididos em três grupos experimentais (n=16): grupo H30 com dentes sem fluorose e grupos F30 e F60 com dentes com fluorose (Índice de Thylstrup e Fejerskov, classificação 3–4). Após o condicionamento do esmalte com ácido fosfórico a 35% durante 30 segundos (H30 e F30) ou durante 60 segundos (F60), foram cimentados brackets metálicos com o sistema adesivo Transbond XT e fotopolimerizados (1200mW/cm2 durante 10 segundos). Os espécimes foram termociclados (5–55◦C, 500 ciclos), armazenados em água destilada (37◦C/7 dias), e testados ao corte (Instron, 1KN, 1mm/min). A falha foi classificada, com um estereomicroscópio (ampliação 20x), de acordo com o Índice de Adesivo Remanescente (ARI). Os dados de resistência adesiva foram analisados com ANOVA e comparações múltiplas segundo Tukey (a=0,05). Os testes de Kruskal-Wallis e Mann-Whitney foram utilizados para analisar os dados da falha (a=0,05). Resultados: Não foram encontradas diferenças estatisticamente significativas (p=0,763) entre F30 e F60, mas estes grupos apresentaram valores de resistência adesiva estatisticamente (p<0,05) mais baixos que os obtidos em H30. O grupo H30 apresentou uma classificação ARI estatisticamente (p<0,05) superior aos grupos F30 e F60. Conclusões: A adesão de brackets ortodônticos ao esmalte é negativamente influenciada pela fluorose dentária. A duplicação do tempo de condicionamento ácido nos dentes com fluorose não foi suficiente para promover resultados similares aos observados nos dentes sem fluorose.Repositório da Universidade de LisboaMendes, MónicaPortugal, JaimeOliveira, Sofia Arantes eMesquita, Pedro2018-11-08T11:59:42Z20142014-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/35300engMendes M, Portugal J, Oliveira S, et al. Shear bond strength of orthodontic brackets to fluorosed enamel. Rev Port Estomatol Med Dent Cir Maxilofac. 2014;55(2):73-74.info: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:RCAAP2024-11-20T17:43:47Zoai:repositorio.ul.pt:10451/35300Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-11-20T17:43:47Repositório 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 Shear bond strength of orthodontic brackets to fluorosed enamel
title Shear bond strength of orthodontic brackets to fluorosed enamel
spellingShingle Shear bond strength of orthodontic brackets to fluorosed enamel
Mendes, Mónica
Dental fluorosis
Acid etching
Orthodontic brackets
Shear strength
Dental bonding
title_short Shear bond strength of orthodontic brackets to fluorosed enamel
title_full Shear bond strength of orthodontic brackets to fluorosed enamel
title_fullStr Shear bond strength of orthodontic brackets to fluorosed enamel
title_full_unstemmed Shear bond strength of orthodontic brackets to fluorosed enamel
title_sort Shear bond strength of orthodontic brackets to fluorosed enamel
author Mendes, Mónica
author_facet Mendes, Mónica
Portugal, Jaime
Oliveira, Sofia Arantes e
Mesquita, Pedro
author_role author
author2 Portugal, Jaime
Oliveira, Sofia Arantes e
Mesquita, Pedro
author2_role author
author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Mendes, Mónica
Portugal, Jaime
Oliveira, Sofia Arantes e
Mesquita, Pedro
dc.subject.por.fl_str_mv Dental fluorosis
Acid etching
Orthodontic brackets
Shear strength
Dental bonding
topic Dental fluorosis
Acid etching
Orthodontic brackets
Shear strength
Dental bonding
description Objectives: To evaluate the influence of dental fluorosis and etching time on the shear bondstrengths (SBSs) of orthodontic brackets to human enamel.Methods: A total of 48 human maxillary central incisors, extracted for periodontal reasonswere used. The sample was divided into three experimental groups (n = 16): group H30 withhealthy teeth and group F30 and F60 with fluorosed teeth (Thylstrup and Fejerskov Indexscores 3–4). After etching the dental enamel with 35% phosphoric acid for 30 s (groups H30and F30) or for 60 s (group F60), metal orthodontic brackets were bonded with TransbondXT adhesive system and light cured (1200 mW/cm2for 10 s). The specimens were thenthermocycled (5–55◦C, 500 cycles), stored in distilled water (37◦C/7 days), and tested inshear (Instron, 1KN, 1 mm/min). Failure mode was classified, with a stereomicroscope (20×magnification), according to the adhesive remnant index (ARI). SBS data were statisticallyanalyzed with 1-way ANOVA, followed by Tukey post hoc tests (˛a= 0.05). Kruskal–Wallis andMann–Whitney nonparametric tests were used to analyze failure data (˛a= 0.05).Results: No statistically significant (p = 0.763) differences were found between F30 and F60,but these groups showed a statistically (p < 0.05) lower bond strength values than H30. Thenon-fluorosed group showed a significantly (p < 0.05) higher ARI score than the other groups.Conclusion: Orthodontic brackets adhesion to enamel is negatively influenced by dental fluo-rosis. Doubling the etching time in fluorosed teeth was not enough to produce similar resultsto those observed in the healthy ones.
publishDate 2014
dc.date.none.fl_str_mv 2014
2014-01-01T00:00:00Z
2018-11-08T11:59:42Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10451/35300
url http://hdl.handle.net/10451/35300
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Mendes M, Portugal J, Oliveira S, et al. Shear bond strength of orthodontic brackets to fluorosed enamel. Rev Port Estomatol Med Dent Cir Maxilofac. 2014;55(2):73-74.
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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