Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogo
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| Main Author: | |
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| Publication Date: | 2020 |
| Format: | Doctoral thesis |
| Language: | por |
| Source: | Repositório Institucional da UPF |
| Download full: | https://repositorio.upf.br/handle/123456789/4045 |
Summary: | evaluate the elastic properties of young and old human dentin and mechanical properties of a glass fiber-reinforced composite (GFRC) manufactured with different compositions. Methods: Samples with 2-mm of thickness from extracted healthy teeth were obtained from young patients (18-30 years) and old patients (40-60 years) (n=2), and used to obtaining the elastic modulus values by nanoindentation. Four different regions were measured: occlusal (O), pulp occlusion (PO), cervical (C) and pulp cervical (PC). Data were statistically evaluated using Kruskal-Wallis and Dunn's (α=0.05) tests. A glass fiber-reinforced composite (GFRC), obtained by the pultrusion process, was manufactured in four different compositions according to the rate of glass fibers (25% or 40%) and with (WF) and without (OF) filler particles in the matrix, generating the experimental groups: GFRC-OF25, GFRC-OF40, GFRC-WF25, GFRC-WF40. Mechanical properties such as density (ρ) (n=5), elastic modulus (E) and Poisson's ratio (ν) (n=5), Knoop microhardness (HK) (n=5), 3-point flexural strength (σ) and flexural elastic modulus (Ef) (n=10), and biaxial strength (σf) (n=10) were evaluated. Data were compared using Two-way Anova and Tukey (α = 0.05). Results: The mean values of elastic modulus obtained for old dentin ranged from 14.9 GPa to 24.75 GPa, with no statistical difference between the regions evaluated. The results obtained for young dentin ranged from 3.61 GPa to 25.0 GPa, with the lowest value obtained for the cervical region, statistically different from the occlusal-pulpal region. There was a statistical difference for the mean of the ρ and E values of the GFRC `s, with the highest values obtained for the GFRC`s that have a higher percentage of glass fibers in the composition, regardless of the presence or absence of filler particles. CRFVs with 40% of glass fibers had higher HK and Ef than the CRFVs with 25%. CRFVs with 25% of glass fibers had higher biaxial strength than CRFVs with 40% of glass fibers. Conclusion: Young and old dentin have no difference in the elastic modulus. With the exception of the cervical region, there is no difference in the elastic modulus of the regions measured in this study. The modification of the composition alters the mechanical properties of GFRC `s, and GFRC-WF40 was the most suitable material to simulate dentin in laboratory tests. |
| _version_ | 1871607617399291904 |
|---|---|
| author | Merlo, Érlon Grando |
| author_browse | Merlo, Érlon Grando |
| author_facet | Merlo, Érlon Grando |
| author_role | author |
| collection | Repositório Institucional da UPF |
| dc.contributor.author.fl_str_mv | Merlo, Érlon Grando |
| dc.contributor.none.fl_str_mv | Corazza, Pedro Henrique http://lattes.cnpq.br/6986826904953210 |
| dc.date.none.fl_str_mv | 2020-08-05 2025-05-07T17:54:10Z |
| dc.format.none.fl_str_mv | application/pdf application/pdf |
| dc.identifier.uri.fl_str_mv | MERLO, Érlon Grando. Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogo. 2021. 121 f. Tese (Doutorado em Odontologia) - Universidade de Passo Fundo, Passo Fundo, RS, 2021. https://repositorio.upf.br/handle/123456789/4045 |
| dc.language.iso.fl_str_mv | por |
| dc.publisher.none.fl_str_mv | Universidade de Passo Fundo Faculdade de Odontologia – FO Brasil UPF Programa de Pós-Graduação em Odontologia |
| dc.rights.driver.fl_str_mv | info:eu-repo/semantics/openAccess |
| dc.source.none.fl_str_mv | reponame:Repositório Institucional da UPF instname:Universidade de Passo Fundo (UPF) instacron:UPF |
| dc.subject.por.fl_str_mv | Dentina Odontologia CIENCIAS DA SAUDE::ODONTOLOGIA |
| dc.title.none.fl_str_mv | Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogo |
| dc.type.driver.fl_str_mv | info:eu-repo/semantics/doctoralThesis |
| dc.type.status.fl_str_mv | info:eu-repo/semantics/publishedVersion |
| description | evaluate the elastic properties of young and old human dentin and mechanical properties of a glass fiber-reinforced composite (GFRC) manufactured with different compositions. Methods: Samples with 2-mm of thickness from extracted healthy teeth were obtained from young patients (18-30 years) and old patients (40-60 years) (n=2), and used to obtaining the elastic modulus values by nanoindentation. Four different regions were measured: occlusal (O), pulp occlusion (PO), cervical (C) and pulp cervical (PC). Data were statistically evaluated using Kruskal-Wallis and Dunn's (α=0.05) tests. A glass fiber-reinforced composite (GFRC), obtained by the pultrusion process, was manufactured in four different compositions according to the rate of glass fibers (25% or 40%) and with (WF) and without (OF) filler particles in the matrix, generating the experimental groups: GFRC-OF25, GFRC-OF40, GFRC-WF25, GFRC-WF40. Mechanical properties such as density (ρ) (n=5), elastic modulus (E) and Poisson's ratio (ν) (n=5), Knoop microhardness (HK) (n=5), 3-point flexural strength (σ) and flexural elastic modulus (Ef) (n=10), and biaxial strength (σf) (n=10) were evaluated. Data were compared using Two-way Anova and Tukey (α = 0.05). Results: The mean values of elastic modulus obtained for old dentin ranged from 14.9 GPa to 24.75 GPa, with no statistical difference between the regions evaluated. The results obtained for young dentin ranged from 3.61 GPa to 25.0 GPa, with the lowest value obtained for the cervical region, statistically different from the occlusal-pulpal region. There was a statistical difference for the mean of the ρ and E values of the GFRC `s, with the highest values obtained for the GFRC`s that have a higher percentage of glass fibers in the composition, regardless of the presence or absence of filler particles. CRFVs with 40% of glass fibers had higher HK and Ef than the CRFVs with 25%. CRFVs with 25% of glass fibers had higher biaxial strength than CRFVs with 40% of glass fibers. Conclusion: Young and old dentin have no difference in the elastic modulus. With the exception of the cervical region, there is no difference in the elastic modulus of the regions measured in this study. The modification of the composition alters the mechanical properties of GFRC `s, and GFRC-WF40 was the most suitable material to simulate dentin in laboratory tests. |
| eu_rights_str_mv | openAccess |
| format | doctoralThesis |
| id | UPF_227a5ec3cfd3fd8708743cbb2dfe4db1 |
| identifier_str_mv | MERLO, Érlon Grando. Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogo. 2021. 121 f. Tese (Doutorado em Odontologia) - Universidade de Passo Fundo, Passo Fundo, RS, 2021. |
| instacron_str | UPF |
| institution | UPF |
| instname_str | Universidade de Passo Fundo (UPF) |
| language | por |
| network_acronym_str | UPF |
| network_name_str | Repositório Institucional da UPF |
| oai_identifier_str | oai:repositorio.upf.br:123456789/4045 |
| publishDate | 2020 |
| publishDateSort | 2020 |
| publisher.none.fl_str_mv | Universidade de Passo Fundo Faculdade de Odontologia – FO Brasil UPF Programa de Pós-Graduação em Odontologia |
| reponame_str | Repositório Institucional da UPF |
| repository.mail.fl_str_mv | jucelei@upf.br||biblio@upf.br |
| repository.name.fl_str_mv | Repositório Institucional da UPF - Universidade de Passo Fundo (UPF) |
| repository_id_str | 1610 |
| spelling | Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogoDentinaOdontologiaCIENCIAS DA SAUDE::ODONTOLOGIAevaluate the elastic properties of young and old human dentin and mechanical properties of a glass fiber-reinforced composite (GFRC) manufactured with different compositions. Methods: Samples with 2-mm of thickness from extracted healthy teeth were obtained from young patients (18-30 years) and old patients (40-60 years) (n=2), and used to obtaining the elastic modulus values by nanoindentation. Four different regions were measured: occlusal (O), pulp occlusion (PO), cervical (C) and pulp cervical (PC). Data were statistically evaluated using Kruskal-Wallis and Dunn's (α=0.05) tests. A glass fiber-reinforced composite (GFRC), obtained by the pultrusion process, was manufactured in four different compositions according to the rate of glass fibers (25% or 40%) and with (WF) and without (OF) filler particles in the matrix, generating the experimental groups: GFRC-OF25, GFRC-OF40, GFRC-WF25, GFRC-WF40. Mechanical properties such as density (ρ) (n=5), elastic modulus (E) and Poisson's ratio (ν) (n=5), Knoop microhardness (HK) (n=5), 3-point flexural strength (σ) and flexural elastic modulus (Ef) (n=10), and biaxial strength (σf) (n=10) were evaluated. Data were compared using Two-way Anova and Tukey (α = 0.05). Results: The mean values of elastic modulus obtained for old dentin ranged from 14.9 GPa to 24.75 GPa, with no statistical difference between the regions evaluated. The results obtained for young dentin ranged from 3.61 GPa to 25.0 GPa, with the lowest value obtained for the cervical region, statistically different from the occlusal-pulpal region. There was a statistical difference for the mean of the ρ and E values of the GFRC `s, with the highest values obtained for the GFRC`s that have a higher percentage of glass fibers in the composition, regardless of the presence or absence of filler particles. CRFVs with 40% of glass fibers had higher HK and Ef than the CRFVs with 25%. CRFVs with 25% of glass fibers had higher biaxial strength than CRFVs with 40% of glass fibers. Conclusion: Young and old dentin have no difference in the elastic modulus. With the exception of the cervical region, there is no difference in the elastic modulus of the regions measured in this study. The modification of the composition alters the mechanical properties of GFRC `s, and GFRC-WF40 was the most suitable material to simulate dentin in laboratory tests.Avaliar as propriedades elásticas de dentina humana jovem e com idade avançada e as propriedades mecânicas de um compósito reforçado por fibras (CRFV) com diferentes composições. Materiais e métodos: Amostras com 2 mm de espessura de dentes hígidos extraídos foram obtidas de pacientes jovens (18- 30 anos) e pacientes com idade avançada (40-60 anos) (n=2) para obtenção do módulo elástico por nanoindentação. Quatro diferentes regiões foram mensuradas: oclusal (O), oclusopulpar (OP), cervical (C) e cérvicopulpar (CP). Os dados avaliados estatisticamente por Kruskal-Wallis e post hoc de Dunn (α=0,05). Um compósito reforçado por fibras de vidro obtido pelo processo de pultrusão foi confeccionado em 4 diferentes composições, com mudanças no percentual de fibras de vidro (25% e 40%) e presença (CC) ou não (SC) de carga na matriz, gerando os grupos CRFV-SC25, CRFV-SC40, CRFV-CC25, e CRFV-CC40. As propriedades mecânicas densidade (ρ) (n=5), módulo elástico (E) e razão de Poisson (ν) (n=5), microdureza Knoop (HK) (n=5), resistência por 3 pontos (σ) e módulo elástico flexural (Ef) (n=10) e resistência à flexão biaxial (σf) (n=10) foram avaliadas. Os dados foram avaliados estatisticamente por Anova Two-way e post hoc de Tukey (α=0,05). Resultados: Os valores médios de módulo elástico obtidos para a dentina com idade avançada variaram de 14,9 GPa a 24,75 GPa, não havendo diferença estatística entre as regiões avaliadas. Os resultados obtidos para a dentina jovem variaram de 3,61 GPa a 25,0 GPa, sendo o menor valor obtido para a região cervical, estatisticamente diferente da região ocluso-pulpar. Houve diferença estatística para a média dos valores de ρ e E dos CRFV`s, sendo os maiores valores obtidos para os CRFV`s que possuem maior porcentagem de fibras de vidro na composição, independente da presença ou não de carga. Os CRFVs com 40% de fibras de vidro apresentaram maior HK e Ef que os CRFVs 25. Os CRFVs com 25% de fibras de vidro apresentaram maior resistência à flexão biaxial que os CRFVs com 40% de fibras de vidro. Conclusão: A dentina jovem e com idade avançada não possuem diferença de módulo de elasticidade. Com exceção da região cervical, não há diferença de módulo elástico nas regiões mensuradas por este estudo. A modificação da composição altera as propriedades mecânicas do CRFV, sendo que o CRFV-CC40 mostrou ser o material mais indicado para substituir a dentina em testes de laboratório.Universidade de Passo FundoFaculdade de Odontologia – FOBrasilUPFPrograma de Pós-Graduação em OdontologiaCorazza, Pedro Henriquehttp://lattes.cnpq.br/6986826904953210Merlo, Érlon Grando2025-05-07T17:54:10Z2020-08-05info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfapplication/pdfMERLO, Érlon Grando. Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogo. 2021. 121 f. Tese (Doutorado em Odontologia) - Universidade de Passo Fundo, Passo Fundo, RS, 2021.https://repositorio.upf.br/handle/123456789/4045porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UPFinstname:Universidade de Passo Fundo (UPF)instacron:UPF2025-12-30T20:17:15Zoai:repositorio.upf.br:123456789/4045Repositório InstitucionalPRIhttp://repositorio.upf.br/oai/requestjucelei@upf.br||biblio@upf.bropendoar:16102025-12-30T20:17:15Repositório Institucional da UPF - Universidade de Passo Fundo (UPF) |
| spellingShingle | Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogo Merlo, Érlon Grando Dentina Odontologia CIENCIAS DA SAUDE::ODONTOLOGIA |
| status_str | publishedVersion |
| title | Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogo |
| title_full | Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogo |
| title_fullStr | Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogo |
| title_full_unstemmed | Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogo |
| title_short | Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogo |
| title_sort | Propriedades elásticas da dentina humana e de um compósito reforçado por fibras de vidro como análogo |
| topic | Dentina Odontologia CIENCIAS DA SAUDE::ODONTOLOGIA |
| url | https://repositorio.upf.br/handle/123456789/4045 |