Effect of Finish Line on Marginal Fit of Sintered Gold Copings
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/0103-6440201301575 http://hdl.handle.net/11449/212761 |
Resumo: | The aim of this study was to evaluate the vertical marginal gap of sintered gold copings and metal-ceramic crowns with different finish line preparations: a beveled round shoulder (BRS) and a beveled long chamfer (BLC), testing the null hypotheses that there are no differences in marginal gap regardless of finish line and phase of restoration (coping or crown). Stainless steel master models were fabricated to simulate tooth preparation for metal-ceramic crowns with different finish lines (BRS and BLC). Ten dies were obtained from each model. Preparations were coated with 2 layers of spacer to 1 mm from the margin. Sintercast gold copings were prepared, sintered and adjusted to the dies. The copings (n=10) were placed onto the master model and the marginal gap was measured in 24 equidistant points using optical microscopy (X230). An opaque and two body ceramic layers were subsequently applied to the copings and the same measuring procedure was performed for the crowns. The data were analyzed statistically using paired and unpaired Student's t-test (α=0.05). Mean marginal gap values (µm) for the copings and crowns were, respectively: 113.6 and 117.1 for the BRS; and 58.2 and 74.3 for the BLC preparation. Significantly greater marginal gaps (p=0.0307) were found for restorations with BRS than with BLC finish line, which also showed statistically significant differences in the gap size between coping and crown (p=0.001). In conclusion, marginal gap is influenced by ceramic application on copings fabricated on BLC preparation, and greater marginal gaps were found for restorations with BRS finish line, rejecting the experimental null hypotheses. |
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Effect of Finish Line on Marginal Fit of Sintered Gold Copingssintered gold crownsmetal ceramic alloysmarginal adaptationdental porcelainThe aim of this study was to evaluate the vertical marginal gap of sintered gold copings and metal-ceramic crowns with different finish line preparations: a beveled round shoulder (BRS) and a beveled long chamfer (BLC), testing the null hypotheses that there are no differences in marginal gap regardless of finish line and phase of restoration (coping or crown). Stainless steel master models were fabricated to simulate tooth preparation for metal-ceramic crowns with different finish lines (BRS and BLC). Ten dies were obtained from each model. Preparations were coated with 2 layers of spacer to 1 mm from the margin. Sintercast gold copings were prepared, sintered and adjusted to the dies. The copings (n=10) were placed onto the master model and the marginal gap was measured in 24 equidistant points using optical microscopy (X230). An opaque and two body ceramic layers were subsequently applied to the copings and the same measuring procedure was performed for the crowns. The data were analyzed statistically using paired and unpaired Student's t-test (α=0.05). Mean marginal gap values (µm) for the copings and crowns were, respectively: 113.6 and 117.1 for the BRS; and 58.2 and 74.3 for the BLC preparation. Significantly greater marginal gaps (p=0.0307) were found for restorations with BRS than with BLC finish line, which also showed statistically significant differences in the gap size between coping and crown (p=0.001). In conclusion, marginal gap is influenced by ceramic application on copings fabricated on BLC preparation, and greater marginal gaps were found for restorations with BRS finish line, rejecting the experimental null hypotheses.O objetivo deste estudo foi avaliar a fenda marginal vertical de copings de ouro sinterizado e coroas metalo-cerâmicas com diferentes tipos de término de preparo: ombro arredondado biselado (OAB) e chanfro longo biselado (CLB), testando a hipótese nula de que não há diferenças na adaptação marginal quando se compara o tipo de término ou a fase da restauração (coping ou coroa). Modelos de aço inoxidável foram confeccionados simulando preparos dentais com diferentes términos (OAB e CLB). Dez modelos de gesso foram confeccionados a partir de cada preparo. Duas camadas de espaçador foram passadas em cada preparo, a 1 mm da margem. Os copings de Sintercast confeccionados, sinterizados e ajustados ao modelo de gesso. Os copings (n=10) foram colocados no modelo de aço e a fenda marginal foi medida em 24 pontos equidistantes por meio de microscópio óptico (×230). Uma camada de opaco e duas de porcelana feldspática foram aplicadas sobre os copings e o mesmo processo de mensuração de fenda foi utilizado para as coroas. Os dados foram analisados estatisticamente usando o teste t Student pareado e não-pareado (α=0,05). Os valores médios de fenda marginal (µm) para os copings e coroas foram, respectivamente: 113,6 e 117,1 para OAB; e 58,2 e 74,3 para CLB. Fendas marginais significantemente maiores (p=0,0307) foram observadas nas restaurações com términos OAB quando comparados ao término CLB, o qual mostrou diferenças estatísticas na comparação entre coping e coroa (p=0,001). Em conclusão, a fenda marginal é influenciada pela aplicação de cerâmica em copings fabricados com términos CLB, e fendas marginais maiores foram observadas para restaurações com término OAB, rejeitando-se as hipóteses nulas.Oregon Health and Science University, Department of Biomaterials and BiomechanicsUNESP - Univ Estadual Paulista, São José dos Campos School of DentistryUniversity of Passo Fundo, School of DentistryUNESP - Univ Estadual Paulista, São José dos Campos School of DentistryFundação Odontológica de Ribeirão PretoOregon Health and Science UniversityUniversidade Estadual Paulista (Unesp)University of Passo FundoGwinner, Fernanda PelogiaBottino, Marco Antonio [UNESP]Nogueira-junior, Lafayete [UNESP]Bona, Álvaro Della2021-07-14T10:44:45Z2021-07-14T10:44:45Z2013info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article322-325application/pdfhttp://dx.doi.org/10.1590/0103-6440201301575Brazilian Dental Journal. Fundação Odontológica de Ribeirão Preto, v. 24, n. 4, p. 322-325, 2013.0103-64401806-4760http://hdl.handle.net/11449/21276110.1590/0103-6440201301575S0103-64402013000400322S0103-64402013000400322.pdfSciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBrazilian Dental Journalinfo:eu-repo/semantics/openAccess2024-01-02T06:15:35Zoai:repositorio.unesp.br:11449/212761Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:53:32.566761Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Effect of Finish Line on Marginal Fit of Sintered Gold Copings |
title |
Effect of Finish Line on Marginal Fit of Sintered Gold Copings |
spellingShingle |
Effect of Finish Line on Marginal Fit of Sintered Gold Copings Gwinner, Fernanda Pelogia sintered gold crowns metal ceramic alloys marginal adaptation dental porcelain |
title_short |
Effect of Finish Line on Marginal Fit of Sintered Gold Copings |
title_full |
Effect of Finish Line on Marginal Fit of Sintered Gold Copings |
title_fullStr |
Effect of Finish Line on Marginal Fit of Sintered Gold Copings |
title_full_unstemmed |
Effect of Finish Line on Marginal Fit of Sintered Gold Copings |
title_sort |
Effect of Finish Line on Marginal Fit of Sintered Gold Copings |
author |
Gwinner, Fernanda Pelogia |
author_facet |
Gwinner, Fernanda Pelogia Bottino, Marco Antonio [UNESP] Nogueira-junior, Lafayete [UNESP] Bona, Álvaro Della |
author_role |
author |
author2 |
Bottino, Marco Antonio [UNESP] Nogueira-junior, Lafayete [UNESP] Bona, Álvaro Della |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Oregon Health and Science University Universidade Estadual Paulista (Unesp) University of Passo Fundo |
dc.contributor.author.fl_str_mv |
Gwinner, Fernanda Pelogia Bottino, Marco Antonio [UNESP] Nogueira-junior, Lafayete [UNESP] Bona, Álvaro Della |
dc.subject.por.fl_str_mv |
sintered gold crowns metal ceramic alloys marginal adaptation dental porcelain |
topic |
sintered gold crowns metal ceramic alloys marginal adaptation dental porcelain |
description |
The aim of this study was to evaluate the vertical marginal gap of sintered gold copings and metal-ceramic crowns with different finish line preparations: a beveled round shoulder (BRS) and a beveled long chamfer (BLC), testing the null hypotheses that there are no differences in marginal gap regardless of finish line and phase of restoration (coping or crown). Stainless steel master models were fabricated to simulate tooth preparation for metal-ceramic crowns with different finish lines (BRS and BLC). Ten dies were obtained from each model. Preparations were coated with 2 layers of spacer to 1 mm from the margin. Sintercast gold copings were prepared, sintered and adjusted to the dies. The copings (n=10) were placed onto the master model and the marginal gap was measured in 24 equidistant points using optical microscopy (X230). An opaque and two body ceramic layers were subsequently applied to the copings and the same measuring procedure was performed for the crowns. The data were analyzed statistically using paired and unpaired Student's t-test (α=0.05). Mean marginal gap values (µm) for the copings and crowns were, respectively: 113.6 and 117.1 for the BRS; and 58.2 and 74.3 for the BLC preparation. Significantly greater marginal gaps (p=0.0307) were found for restorations with BRS than with BLC finish line, which also showed statistically significant differences in the gap size between coping and crown (p=0.001). In conclusion, marginal gap is influenced by ceramic application on copings fabricated on BLC preparation, and greater marginal gaps were found for restorations with BRS finish line, rejecting the experimental null hypotheses. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013 2021-07-14T10:44:45Z 2021-07-14T10:44:45Z |
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://dx.doi.org/10.1590/0103-6440201301575 Brazilian Dental Journal. Fundação Odontológica de Ribeirão Preto, v. 24, n. 4, p. 322-325, 2013. 0103-6440 1806-4760 http://hdl.handle.net/11449/212761 10.1590/0103-6440201301575 S0103-64402013000400322 S0103-64402013000400322.pdf |
url |
http://dx.doi.org/10.1590/0103-6440201301575 http://hdl.handle.net/11449/212761 |
identifier_str_mv |
Brazilian Dental Journal. Fundação Odontológica de Ribeirão Preto, v. 24, n. 4, p. 322-325, 2013. 0103-6440 1806-4760 10.1590/0103-6440201301575 S0103-64402013000400322 S0103-64402013000400322.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Brazilian Dental Journal |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
322-325 application/pdf |
dc.publisher.none.fl_str_mv |
Fundação Odontológica de Ribeirão Preto |
publisher.none.fl_str_mv |
Fundação Odontológica de Ribeirão Preto |
dc.source.none.fl_str_mv |
SciELO reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129370518192128 |