AVALIAÇÃO DAS PROPRIEDADES MECÂNICAS E QUÍMICAS DE RESINAS BIOATIVAS EXPERIMENTAIS PARA A COLAGEM DE BRÁQUETES.
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da UFMA |
Texto Completo: | https://tedebc.ufma.br/jspui/handle/tede/tede/2927 |
Resumo: | Objective: To develop and characterize experimental materials containing different concentrations of niobophosphate (NbG) and 45S5 glass used for bonding of brackets: pH, microhardness, bioactivity, bond strength and fracture mode (ARI). Materials and Methods: Experimental resins (NbG 5%, NbG 10%, NbG 20%, 45S5 5%, 45S5 10% and 45S5 20%) were used, an experimental resin without bioactive glass and a commercial resin (Transbond XT) were also used. evaluated. To evaluate the ability to neutralize / alkalize, resin discs (15 mm diameter and 1.3 mm high) were made and immersed in two pHs (4 and 7) and pH measurements were analyzed in the 24h, 7d , 14d and 28d (n = 4). The resulting solution was subjected to inductively coupled plasma atomic emission spectrometry (ICP-AES) to analyze the release of Ca ++ and PO4-3 ions. To evaluate Knoop microhardness of the materials, specimens were made and taken to a microdurometer. To evaluate the bioactivity, resin disks were prepared and maintained in PBS for 28 days and taken for analysis in SEM and FTIR / ATR (n = 4). Metallic brackets were bonded to human premolars (n = 10) and subjected to a Des-Re cycling for 8 days. After this period, the bond strength was evaluated in a universal test machine (Instron 3342). The fracture mode (IAR) was evaluated in a stereomicroscope at a magnitude of 10x. To determine statistically significant differences the data from each test were submitted to appropriate statistical analysis. Results: Experimental resins containing 45 S5 showed the ability to raise the pH of the solution, regardless of the initial pH and bioglass concentration in the material. The other resin (NbG, Control and Transbond XT) presented a neutralizing potential only for the initial pH 4. Transbond XT resin at initial pH 7 reduced the pH to an acidic condition (pH = 5.7) after 28 days. The release of calcium and phosphorus ions was most notably present in solutions of pH = 4. Phosphorus release was low in the most of resins. The resins without bioactive glasses (Transbond XT and Control) did not present release of calcium and phosphate ions. Transbond XT shows high microhardness when compared to experimental resins (P <0.05). SEM analysis showed surface precipitates of resins containing bioactive glasses. These images agree with the results obtained in the FTIR / ATR analysis, where calcium phosphate peaks were observed. Transbond XT and control resins did not show precipitate formation after the 28 day period. There was no difference in bond strength between the materials tested. The Transbond XT showed a tendency of ARI = 2, while the other resins showed predominance of ARI = 0. Conclusion: Resins containing bioactive glass showed a bond strength equal to that of the resin considered to be market standard, with the advantage of leaving residual adhesive in a reduced quantity. In addition, the low hardness presented by these resins may be a good feature, facilitating the removal of the remaining adhesive. Resins containing 45 S5 in their various concentrations showed a high capacity to raise the local pH and released calcium and phosphorus ions. The formation of precipitates on the surface of the material may be indicative of their bioactivity. |
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BAUER, José Roberto de Oliveira034.859.257-48http://lattes.cnpq.br/9161539475400082BAUER, José Roberto de Oliveira034.859.257-48http://lattes.cnpq.br/9161539475400082MANSO, Adrianahttp://lattes.cnpq.br/8766436886189150CARVALHO, Ceci Nuneshttp://lattes.cnpq.br/2210540364003884HASS, Vivianehttp://lattes.cnpq.br/4879064558869540LIMA, Darlon Martinshttp://lattes.cnpq.br/9472478898441292023.894.593-66FREITAS, Mariana Almeida Mello Proença de2019-11-26T14:23:08Z2018-02-28FREITAS, Mariana Almeida Mello Proença de. Avaliação das propriedades mecânicas e químicas de resinas bioativas experimentais para a colagem de bráquetes.. 2018. 49 folhas. Tese ( Programa de Pós-Graduação em Odontologia/CCBS) - Universidade Federal do Maranhão, São Luís, 2019.https://tedebc.ufma.br/jspui/handle/tede/tede/2927Objective: To develop and characterize experimental materials containing different concentrations of niobophosphate (NbG) and 45S5 glass used for bonding of brackets: pH, microhardness, bioactivity, bond strength and fracture mode (ARI). Materials and Methods: Experimental resins (NbG 5%, NbG 10%, NbG 20%, 45S5 5%, 45S5 10% and 45S5 20%) were used, an experimental resin without bioactive glass and a commercial resin (Transbond XT) were also used. evaluated. To evaluate the ability to neutralize / alkalize, resin discs (15 mm diameter and 1.3 mm high) were made and immersed in two pHs (4 and 7) and pH measurements were analyzed in the 24h, 7d , 14d and 28d (n = 4). The resulting solution was subjected to inductively coupled plasma atomic emission spectrometry (ICP-AES) to analyze the release of Ca ++ and PO4-3 ions. To evaluate Knoop microhardness of the materials, specimens were made and taken to a microdurometer. To evaluate the bioactivity, resin disks were prepared and maintained in PBS for 28 days and taken for analysis in SEM and FTIR / ATR (n = 4). Metallic brackets were bonded to human premolars (n = 10) and subjected to a Des-Re cycling for 8 days. After this period, the bond strength was evaluated in a universal test machine (Instron 3342). The fracture mode (IAR) was evaluated in a stereomicroscope at a magnitude of 10x. To determine statistically significant differences the data from each test were submitted to appropriate statistical analysis. Results: Experimental resins containing 45 S5 showed the ability to raise the pH of the solution, regardless of the initial pH and bioglass concentration in the material. The other resin (NbG, Control and Transbond XT) presented a neutralizing potential only for the initial pH 4. Transbond XT resin at initial pH 7 reduced the pH to an acidic condition (pH = 5.7) after 28 days. The release of calcium and phosphorus ions was most notably present in solutions of pH = 4. Phosphorus release was low in the most of resins. The resins without bioactive glasses (Transbond XT and Control) did not present release of calcium and phosphate ions. Transbond XT shows high microhardness when compared to experimental resins (P <0.05). SEM analysis showed surface precipitates of resins containing bioactive glasses. These images agree with the results obtained in the FTIR / ATR analysis, where calcium phosphate peaks were observed. Transbond XT and control resins did not show precipitate formation after the 28 day period. There was no difference in bond strength between the materials tested. The Transbond XT showed a tendency of ARI = 2, while the other resins showed predominance of ARI = 0. Conclusion: Resins containing bioactive glass showed a bond strength equal to that of the resin considered to be market standard, with the advantage of leaving residual adhesive in a reduced quantity. In addition, the low hardness presented by these resins may be a good feature, facilitating the removal of the remaining adhesive. Resins containing 45 S5 in their various concentrations showed a high capacity to raise the local pH and released calcium and phosphorus ions. The formation of precipitates on the surface of the material may be indicative of their bioactivity.Objetivo: Desenvolver e caracterizar materiais experimentais contendo diferentes concentrações de vidro niobofasfato (NbG) e 45S5 usados para colagem de bráquetes: pH, microdureza, bioatividade, resistência de união e modo de fratura (IAR). Métodos: Foram utilizadas resinas experimentais (NbG 5%, NbG 10%, NbG 20%, 45S5 5%, 45S5 10% e 45S5 20%), uma resina experimental sem vidro bioativo e uma resina comercial (Transbond XT) também foram avaliadas. Para a avaliação da capacidade de neutralizar/alcalinizar, discos de resina (15 mm de diâmetro e 1,3 mm de altura) foram confeccionados e imersos em dois pH (4 e 7) e mensurações do pH foram analisados nos períodos de 24h, 7d, 14d e 28d (n = 4). A solução resultante foi submetida à espectrometria de emissão atômica por plasma indutivamente acoplado (ICP-AES) para analisar a liberação de ions Ca++ e PO4-3. Para avaliar microdureza Knoop dos materiais, espécimes foram confeccionados e levados para um microdurômetro. Para a avaliação da bioatividade, discos de resina foram confeccionados e mantidos em PBS por 28 dias e levados para análise em MEV e FTIR/ATR (n = 4). Bráquetes metálicos foram colados em pré-molares humanos (n = 10) e submetidos a uma ciclagem Des-Re por 8 dias. Após esse período, a resistência de união foi avaliada em uma máquina de ensaios universal (Instron 3342). O modo de fratura (IAR) foi avaliado em estereomicroscópio a uma magnitude de 10x. Para determinar diferenças estatisticamente significativas os dados de cada teste foram submetidos à análise estatística apropriada. Resultados: As resinas experimentais contendo 45S5 apresentaram a capacidade de elevar o pH da solução, independente do pH inicial e da concentração de biovidro no material. Já as demais resinas apresentaram (NbG, Controle e Transbond XT) um potencial neutralizante apenas para o pH inicial 4. A resina Transbond XT em pH inicial 7 reduziu o pH para uma condição ácida (pH = 5,7) após 28 dias. A liberação de íons cálcio e fósforo esteve presente de forma mais notável nas soluções de pH = 4. A liberação de fósforo foi baixa em todas as resinas. As resinas livres de vidros bioativos (Transbond XT e Controle) não apresentaram liberação de ions cálcio e fosfato. A Transbond XT apresenta alta microdureza quando comparada com as resinas experimentais (P < 0,05). A análise da superfície por MEV apresentou precipitados na superfície das resinas contendo vidros bioativos. Essas imagens concordam com os resultados obtidos na análise por FTIR/ATR, onde foram observados picos de cálcio fosfato. As resinas Transbond XT e controle não apresentaram a formação de precipitados após o período de 28 dias. Não houve diferença na resistência de união entre os materiais testados. A Transbond XT demonstrou tendência de ARI = 2, enquanto as demais resinas apresentaram predominância de ARI = 0. Conclusão: As resinas contendo vidros bioativos apresentaram resistência de união igual à da resina considerada padrão de mercado, com a vantagem de deixarem remanescentes adesivos em quantidade reduzida. Além disso, a baixa dureza apresentada por essas resinas pode ser uma boa característica, facilitando a remoção do adesivo remanescente. As resinas contendo 45S5 em suas diversas concentrações apresentaram elevada capacidade de elevar o pH local e liberaram íons cálcio e fósforo. A formação de precipitados na superfície do material que podem ser indícios da sua bioatividade.Submitted by Maria Aparecida (cidazen@gmail.com) on 2019-11-26T14:23:08Z No. of bitstreams: 1 Mariana A. M. P. de Freitas.pdf: 16717355 bytes, checksum: b9306a796977e8b8ef8438420395b40b (MD5)Made available in DSpace on 2019-11-26T14:23:08Z (GMT). No. of bitstreams: 1 Mariana A. M. P. de Freitas.pdf: 16717355 bytes, checksum: b9306a796977e8b8ef8438420395b40b (MD5) Previous issue date: 2018-02-28CAPES;FAPEMAapplication/pdfporUniversidade Federal do MaranhãoPROGRAMA DE PÓS-GRADUAÇÃO EM ODONTOLOGIA/CCBSUFMABrasilDEPARTAMENTO DE ODONTOLOGIA I/CCBSBiomateriais;Esmalte dentário;Manchas brancas;Bráquete ortodônticoBiomaterials;Tooth enamel;White spot lesions;Orthodontic bracesMateriais Odontológicos.AVALIAÇÃO DAS PROPRIEDADES MECÂNICAS E QUÍMICAS DE RESINAS BIOATIVAS EXPERIMENTAIS PARA A COLAGEM DE BRÁQUETES.MECHANICAL AND CHEMICAL PROPERTIES RESIN EXPERIMENTAL BIOACTIVES EVALUATION FOR BRACKETS COLLAGE.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações da UFMAinstname:Universidade Federal do Maranhão (UFMA)instacron:UFMAORIGINALMariana A. M. P. de Freitas.pdfMariana A. M. P. de Freitas.pdfapplication/pdf16717355http://tedebc.ufma.br:8080/bitstream/tede/2927/2/Mariana+A.+M.+P.+de+Freitas.pdfb9306a796977e8b8ef8438420395b40bMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-82255http://tedebc.ufma.br:8080/bitstream/tede/2927/1/license.txt97eeade1fce43278e63fe063657f8083MD51tede/29272019-11-26 11:23:08.128oai:tede2: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Biblioteca Digital de Teses e Dissertaçõeshttps://tedebc.ufma.br/jspui/PUBhttp://tedebc.ufma.br:8080/oai/requestrepositorio@ufma.br||repositorio@ufma.bropendoar:21312019-11-26T14:23:08Biblioteca Digital de Teses e Dissertações da UFMA - Universidade Federal do Maranhão (UFMA)false |
dc.title.por.fl_str_mv |
AVALIAÇÃO DAS PROPRIEDADES MECÂNICAS E QUÍMICAS DE RESINAS BIOATIVAS EXPERIMENTAIS PARA A COLAGEM DE BRÁQUETES. |
dc.title.alternative.eng.fl_str_mv |
MECHANICAL AND CHEMICAL PROPERTIES RESIN EXPERIMENTAL BIOACTIVES EVALUATION FOR BRACKETS COLLAGE. |
title |
AVALIAÇÃO DAS PROPRIEDADES MECÂNICAS E QUÍMICAS DE RESINAS BIOATIVAS EXPERIMENTAIS PARA A COLAGEM DE BRÁQUETES. |
spellingShingle |
AVALIAÇÃO DAS PROPRIEDADES MECÂNICAS E QUÍMICAS DE RESINAS BIOATIVAS EXPERIMENTAIS PARA A COLAGEM DE BRÁQUETES. FREITAS, Mariana Almeida Mello Proença de Biomateriais; Esmalte dentário; Manchas brancas; Bráquete ortodôntico Biomaterials; Tooth enamel; White spot lesions; Orthodontic braces Materiais Odontológicos. |
title_short |
AVALIAÇÃO DAS PROPRIEDADES MECÂNICAS E QUÍMICAS DE RESINAS BIOATIVAS EXPERIMENTAIS PARA A COLAGEM DE BRÁQUETES. |
title_full |
AVALIAÇÃO DAS PROPRIEDADES MECÂNICAS E QUÍMICAS DE RESINAS BIOATIVAS EXPERIMENTAIS PARA A COLAGEM DE BRÁQUETES. |
title_fullStr |
AVALIAÇÃO DAS PROPRIEDADES MECÂNICAS E QUÍMICAS DE RESINAS BIOATIVAS EXPERIMENTAIS PARA A COLAGEM DE BRÁQUETES. |
title_full_unstemmed |
AVALIAÇÃO DAS PROPRIEDADES MECÂNICAS E QUÍMICAS DE RESINAS BIOATIVAS EXPERIMENTAIS PARA A COLAGEM DE BRÁQUETES. |
title_sort |
AVALIAÇÃO DAS PROPRIEDADES MECÂNICAS E QUÍMICAS DE RESINAS BIOATIVAS EXPERIMENTAIS PARA A COLAGEM DE BRÁQUETES. |
author |
FREITAS, Mariana Almeida Mello Proença de |
author_facet |
FREITAS, Mariana Almeida Mello Proença de |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
BAUER, José Roberto de Oliveira |
dc.contributor.advisor1ID.fl_str_mv |
034.859.257-48 |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/9161539475400082 |
dc.contributor.referee1.fl_str_mv |
BAUER, José Roberto de Oliveira |
dc.contributor.referee1ID.fl_str_mv |
034.859.257-48 |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/9161539475400082 |
dc.contributor.referee2.fl_str_mv |
MANSO, Adriana |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/8766436886189150 |
dc.contributor.referee3.fl_str_mv |
CARVALHO, Ceci Nunes |
dc.contributor.referee3Lattes.fl_str_mv |
http://lattes.cnpq.br/2210540364003884 |
dc.contributor.referee4.fl_str_mv |
HASS, Viviane |
dc.contributor.referee4Lattes.fl_str_mv |
http://lattes.cnpq.br/4879064558869540 |
dc.contributor.referee5.fl_str_mv |
LIMA, Darlon Martins |
dc.contributor.referee5Lattes.fl_str_mv |
http://lattes.cnpq.br/9472478898441292 |
dc.contributor.authorID.fl_str_mv |
023.894.593-66 |
dc.contributor.author.fl_str_mv |
FREITAS, Mariana Almeida Mello Proença de |
contributor_str_mv |
BAUER, José Roberto de Oliveira BAUER, José Roberto de Oliveira MANSO, Adriana CARVALHO, Ceci Nunes HASS, Viviane LIMA, Darlon Martins |
dc.subject.por.fl_str_mv |
Biomateriais; Esmalte dentário; Manchas brancas; Bráquete ortodôntico |
topic |
Biomateriais; Esmalte dentário; Manchas brancas; Bráquete ortodôntico Biomaterials; Tooth enamel; White spot lesions; Orthodontic braces Materiais Odontológicos. |
dc.subject.eng.fl_str_mv |
Biomaterials; Tooth enamel; White spot lesions; Orthodontic braces |
dc.subject.cnpq.fl_str_mv |
Materiais Odontológicos. |
description |
Objective: To develop and characterize experimental materials containing different concentrations of niobophosphate (NbG) and 45S5 glass used for bonding of brackets: pH, microhardness, bioactivity, bond strength and fracture mode (ARI). Materials and Methods: Experimental resins (NbG 5%, NbG 10%, NbG 20%, 45S5 5%, 45S5 10% and 45S5 20%) were used, an experimental resin without bioactive glass and a commercial resin (Transbond XT) were also used. evaluated. To evaluate the ability to neutralize / alkalize, resin discs (15 mm diameter and 1.3 mm high) were made and immersed in two pHs (4 and 7) and pH measurements were analyzed in the 24h, 7d , 14d and 28d (n = 4). The resulting solution was subjected to inductively coupled plasma atomic emission spectrometry (ICP-AES) to analyze the release of Ca ++ and PO4-3 ions. To evaluate Knoop microhardness of the materials, specimens were made and taken to a microdurometer. To evaluate the bioactivity, resin disks were prepared and maintained in PBS for 28 days and taken for analysis in SEM and FTIR / ATR (n = 4). Metallic brackets were bonded to human premolars (n = 10) and subjected to a Des-Re cycling for 8 days. After this period, the bond strength was evaluated in a universal test machine (Instron 3342). The fracture mode (IAR) was evaluated in a stereomicroscope at a magnitude of 10x. To determine statistically significant differences the data from each test were submitted to appropriate statistical analysis. Results: Experimental resins containing 45 S5 showed the ability to raise the pH of the solution, regardless of the initial pH and bioglass concentration in the material. The other resin (NbG, Control and Transbond XT) presented a neutralizing potential only for the initial pH 4. Transbond XT resin at initial pH 7 reduced the pH to an acidic condition (pH = 5.7) after 28 days. The release of calcium and phosphorus ions was most notably present in solutions of pH = 4. Phosphorus release was low in the most of resins. The resins without bioactive glasses (Transbond XT and Control) did not present release of calcium and phosphate ions. Transbond XT shows high microhardness when compared to experimental resins (P <0.05). SEM analysis showed surface precipitates of resins containing bioactive glasses. These images agree with the results obtained in the FTIR / ATR analysis, where calcium phosphate peaks were observed. Transbond XT and control resins did not show precipitate formation after the 28 day period. There was no difference in bond strength between the materials tested. The Transbond XT showed a tendency of ARI = 2, while the other resins showed predominance of ARI = 0. Conclusion: Resins containing bioactive glass showed a bond strength equal to that of the resin considered to be market standard, with the advantage of leaving residual adhesive in a reduced quantity. In addition, the low hardness presented by these resins may be a good feature, facilitating the removal of the remaining adhesive. Resins containing 45 S5 in their various concentrations showed a high capacity to raise the local pH and released calcium and phosphorus ions. The formation of precipitates on the surface of the material may be indicative of their bioactivity. |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018-02-28 |
dc.date.accessioned.fl_str_mv |
2019-11-26T14:23:08Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
FREITAS, Mariana Almeida Mello Proença de. Avaliação das propriedades mecânicas e químicas de resinas bioativas experimentais para a colagem de bráquetes.. 2018. 49 folhas. Tese ( Programa de Pós-Graduação em Odontologia/CCBS) - Universidade Federal do Maranhão, São Luís, 2019. |
dc.identifier.uri.fl_str_mv |
https://tedebc.ufma.br/jspui/handle/tede/tede/2927 |
identifier_str_mv |
FREITAS, Mariana Almeida Mello Proença de. Avaliação das propriedades mecânicas e químicas de resinas bioativas experimentais para a colagem de bráquetes.. 2018. 49 folhas. Tese ( Programa de Pós-Graduação em Odontologia/CCBS) - Universidade Federal do Maranhão, São Luís, 2019. |
url |
https://tedebc.ufma.br/jspui/handle/tede/tede/2927 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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.publisher.none.fl_str_mv |
Universidade Federal do Maranhão |
dc.publisher.program.fl_str_mv |
PROGRAMA DE PÓS-GRADUAÇÃO EM ODONTOLOGIA/CCBS |
dc.publisher.initials.fl_str_mv |
UFMA |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
DEPARTAMENTO DE ODONTOLOGIA I/CCBS |
publisher.none.fl_str_mv |
Universidade Federal do Maranhão |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações da UFMA instname:Universidade Federal do Maranhão (UFMA) instacron:UFMA |
instname_str |
Universidade Federal do Maranhão (UFMA) |
instacron_str |
UFMA |
institution |
UFMA |
reponame_str |
Biblioteca Digital de Teses e Dissertações da UFMA |
collection |
Biblioteca Digital de Teses e Dissertações da UFMA |
bitstream.url.fl_str_mv |
http://tedebc.ufma.br:8080/bitstream/tede/2927/2/Mariana+A.+M.+P.+de+Freitas.pdf http://tedebc.ufma.br:8080/bitstream/tede/2927/1/license.txt |
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bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 |
repository.name.fl_str_mv |
Biblioteca Digital de Teses e Dissertações da UFMA - Universidade Federal do Maranhão (UFMA) |
repository.mail.fl_str_mv |
repositorio@ufma.br||repositorio@ufma.br |
_version_ |
1809926194334793728 |