Análise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LED
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFG |
Texto Completo: | http://repositorio.bc.ufg.br/tede/handle/tede/11244 |
Resumo: | This study analyzed the irradiance and spectrum by emission spectrophotometry (MARC-RC), characterized the light beams (Beam Profile), as well as determined the Knoop microhardness (KHN), the modulus of elasticity (GPa), the degree of conversion ( %), the flexural strength of 3 points (MPa) and the polymerization depth with elasticity modulus of a composite (Filtek Z350 XT) photopolymerized with 5 different types of LED curing units. Of these, three types were not certified by ANVISA and Inmetro, Dental Wireless (E1), Li A180 (E2) and Lyang Ya (E3), and two with certification, VALO Cordless - Ultradent (VL) and Elipar Deep-Cure L - 3 Oral Care (EL). The characterization was carried out by determining irradiance (mW / cm²), emission spectrum (mW / cm² / nm) and radiant exposure (J / cm²) using the MARC Resin Calibrator (MARC-RC, BlueLight). The Beam Profile of the different photoactivating units was made by means of a laser beam profile reader (Beam Profile). 50 specimens were produced for testing microhardness and modulus of elasticity. Each experimental group was polymerized with a photoactivator unit. Microhardness (KHN) was obtained by averaging five indentations on each surface. The modulus of elasticity was obtained by measuring the major and minor diagonals of each indentation. The degree of conversion was obtained by the FTIR / ATR test with 25 specimens. The 3-point flexural strength test (n = 50) was performed using a load in the center of the sample with a constant speed of 0.5 mm / min until fracture. The maximum load was recorded in Newtons. The depth of polymerization of the restoration was evaluated by Knoop microhardness using the average indentations in the regions: mesial, center and distal of healthy human molars prepared in Class II and restored using an oblique incremental technique. The modulus of elasticity of the polymerization depth of the restoration was obtained in the same way as the previous microhardness test. The test data were subjected to the normality test (Shapiro-wilk) followed by Factor analysis of variance (One-way ANOVA), Two-factor analysis of variance (Two-way ANOVA), Tukey HSD test (α = 0, 05) and multiple linear regression. In all tests, the groups showed statistically significant differences between them (p <0.001). The non-certified units (E1, E2 and E3) presented nonhomogeneous light beam profiles with concentrated irradiance in the center of the active tips. E3 showed greater irradiance when compared to the other photoactivating units. VL and EL showed larger diameters between the different photoactivating units. In the microhardness (KHN) and elastic modulus (GPa) tests, VL presented the highest mean values in both and E1, the lowest mean values. VL showed higher values of degree of conversion (%) when compared to EL and E3. The highest values of flexural strength (MPa) were E3 when compared to the other groups, being statistically similar to the VL and E2 groups. At depths closer to the pulp wall, lower mean values of microhardness and modulus of elasticity were obtained. And, the highest mean values of microhardness and modulus of elasticity were found in the occlusal regions (1mm). The interaction between microhardness and modulus of elasticity showed a very strong and proportional positive correlation according to the different depths tested. The analysis of the tests indicated that between microhardness (KHN) and depth of the restoration, a weak positive correlation was obtained and there was no association with irradiance (mW / cm²). The modulus of elasticity (GPa) was not related to the depth of the restoration and to the irradiance (mW / cm²). |
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Veríssimo, Crisnicawhttp://lattes.cnpq.br/2811678434269373Veríssimo, CrisnicawLopes, Lawrence GonzagaSoares, Carlos Joséhttp://lattes.cnpq.br/8502756734277926Almeida, Laís da Mata2021-04-13T17:21:18Z2021-04-13T17:21:18Z2021-02-24ALMEIDA, L. M. Análise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LED. 2021. 70. Tese (Doutorado em Odontologia) - Universidade Federal de Goiás, Goiânia, 2021.http://repositorio.bc.ufg.br/tede/handle/tede/11244This study analyzed the irradiance and spectrum by emission spectrophotometry (MARC-RC), characterized the light beams (Beam Profile), as well as determined the Knoop microhardness (KHN), the modulus of elasticity (GPa), the degree of conversion ( %), the flexural strength of 3 points (MPa) and the polymerization depth with elasticity modulus of a composite (Filtek Z350 XT) photopolymerized with 5 different types of LED curing units. Of these, three types were not certified by ANVISA and Inmetro, Dental Wireless (E1), Li A180 (E2) and Lyang Ya (E3), and two with certification, VALO Cordless - Ultradent (VL) and Elipar Deep-Cure L - 3 Oral Care (EL). The characterization was carried out by determining irradiance (mW / cm²), emission spectrum (mW / cm² / nm) and radiant exposure (J / cm²) using the MARC Resin Calibrator (MARC-RC, BlueLight). The Beam Profile of the different photoactivating units was made by means of a laser beam profile reader (Beam Profile). 50 specimens were produced for testing microhardness and modulus of elasticity. Each experimental group was polymerized with a photoactivator unit. Microhardness (KHN) was obtained by averaging five indentations on each surface. The modulus of elasticity was obtained by measuring the major and minor diagonals of each indentation. The degree of conversion was obtained by the FTIR / ATR test with 25 specimens. The 3-point flexural strength test (n = 50) was performed using a load in the center of the sample with a constant speed of 0.5 mm / min until fracture. The maximum load was recorded in Newtons. The depth of polymerization of the restoration was evaluated by Knoop microhardness using the average indentations in the regions: mesial, center and distal of healthy human molars prepared in Class II and restored using an oblique incremental technique. The modulus of elasticity of the polymerization depth of the restoration was obtained in the same way as the previous microhardness test. The test data were subjected to the normality test (Shapiro-wilk) followed by Factor analysis of variance (One-way ANOVA), Two-factor analysis of variance (Two-way ANOVA), Tukey HSD test (α = 0, 05) and multiple linear regression. In all tests, the groups showed statistically significant differences between them (p <0.001). The non-certified units (E1, E2 and E3) presented nonhomogeneous light beam profiles with concentrated irradiance in the center of the active tips. E3 showed greater irradiance when compared to the other photoactivating units. VL and EL showed larger diameters between the different photoactivating units. In the microhardness (KHN) and elastic modulus (GPa) tests, VL presented the highest mean values in both and E1, the lowest mean values. VL showed higher values of degree of conversion (%) when compared to EL and E3. The highest values of flexural strength (MPa) were E3 when compared to the other groups, being statistically similar to the VL and E2 groups. At depths closer to the pulp wall, lower mean values of microhardness and modulus of elasticity were obtained. And, the highest mean values of microhardness and modulus of elasticity were found in the occlusal regions (1mm). The interaction between microhardness and modulus of elasticity showed a very strong and proportional positive correlation according to the different depths tested. The analysis of the tests indicated that between microhardness (KHN) and depth of the restoration, a weak positive correlation was obtained and there was no association with irradiance (mW / cm²). The modulus of elasticity (GPa) was not related to the depth of the restoration and to the irradiance (mW / cm²).Este estudo analisou a irradiância e espectro por espectrofotometria de emissão (MARC-RC), caracterizou os feixes de luz (Beam Profile), bem como determinou a microdureza Knoop (KHN), o módulo de elasticidade (GPa), o grau de conversão (%), a resistência flexural de 3 pontos (MPa) e a profundidade de polimerização com módulo de elasticidade de um compósito (Filtek Z350 XT) fotopolimerizado com 5 diferentes tipos de unidades fotoativadoras de LED. Dessas, três tipos eram sem certificação pela ANVISA e pelo Inmetro, Dental Wireless (E1), Li A180 (E2) e Lyang Ya (E3), e duas com certificação, VALO Cordless – Ultradent (VL) e Elipar Deep-Cure L – 3 Oral Care (EL). A caracterização foi realizada pela determinação da irradiância (mW/cm²), espectro de emissão (mW/cm²/nm) e exposição radiante (J/cm²) através do MARC Resin Calibrator (MARC-RC, BlueLight). O Beam Profile das diferentes unidades fotoativadoras foi feito por meio através de um leitor à laser de perfil de feixe de luz (Beam Profile). 50 corpos de prova foram produzidos para teste de microdureza e módulo de elasticidade. Cada grupo experimental foi polimerizado com uma unidade fotoativadora. A microdureza (KHN) foi obtida pela média de cinco endentações em cada superfície. O módulo de elasticidade foi obtido pela mensuração das diagonais maiores e menores de cada endentação. O grau de conversão foi obtido pelo teste de FTIR/ATR com 25 corpos de prova. O teste de resistência flexural de 3 pontos (n=50) foi realizado por meio de uma carga no centro da amostra com velocidade constante de 0,5mm/min até a fratura. A carga máxima foi registrada em Newtons. A profundidade de polimerização da restauração foi avaliada por microdureza Knoop pela média de endentações nas regiões: mesial, centro e distal de molares humanos hígidos preparados em Classe II e restaurados por técnica incremental oblíqua. O módulo de elasticidade da profundidade de polimerização da restauração foi obtido da mesma forma do teste anterior de microdureza. Os dados dos testes foram submetidos ao teste de normalidade (Shapiro-wilk) seguidos por Análise de variância fatorial (One-way ANOVA), Análise de variância de dois Fatores (Two-way ANOVA), teste de Tukey HSD (α=0,05) e regressão linear múltipla. Em todos os testes, os grupos apresentaram diferenças estatística significativas entre si (p<0,001). As unidades sem certificação (E1, E2 e E3) apresentaram perfis de feixes de luz não homogêneos e com irradiâncias concentradas no centro das pontas ativas. E3 apresentou maior irradiância quando comparado as outras unidades fotoativadoras. VL e EL apresentaram maiores diâmetros entre as diferentes unidades fotoativadoras. Nos testes de microdureza (KHN) e de módulo de elasticidade (GPa), VL apresentou os maiores valores médios em ambos e E1, os menores valores médios. VL apresentou maiores valores de grau de conversão (%) quando comparado a EL e E3. Os maiores valores de resistência flexural (MPa) foram de E3 quando comparado aos demais grupos, sendo semelhante estatisticamente aos grupos VL e E2. Em profundidades mais próximas da parede pulpar, foram obtidos menores valores médios de microdureza e módulo de elasticidade. E, os maiores valores médios de microdureza e módulo de elasticidade encontrados foram nas regiões oclusais (1mm). A interação entre microdureza e módulo de elasticidade apresentou uma correlação positiva muito forte e proporcional em função das diferentes profundidades testadas. A análise dos testes indicou que entre microdureza (KHN) e profundidade da restauração foi obtida uma correlação positiva fraca e não houve associação com a irradiância (mW/cm²). O módulo de elasticidade (GPa) não teve relação com a profundidade da restauração e com a irradiância (mW/cm²).Submitted by Franciele Moreira (francielemoreyra@gmail.com) on 2021-04-13T17:20:49Z No. of bitstreams: 2 Tese - Thallita Monteiro Teixeira - 2021.pdf: 3007226 bytes, checksum: 3a294fe9241ea40abe6cc0015645fc5e (MD5) license_rdf: 805 bytes, checksum: 4460e5956bc1d1639be9ae6146a50347 (MD5)Approved for entry into archive by Franciele Moreira (francielemoreyra@gmail.com) on 2021-04-13T17:21:18Z (GMT) No. of bitstreams: 2 Tese - Thallita Monteiro Teixeira - 2021.pdf: 3007226 bytes, checksum: 3a294fe9241ea40abe6cc0015645fc5e (MD5) license_rdf: 805 bytes, checksum: 4460e5956bc1d1639be9ae6146a50347 (MD5)Made available in DSpace on 2021-04-13T17:21:18Z (GMT). No. of bitstreams: 2 Tese - Thallita Monteiro Teixeira - 2021.pdf: 3007226 bytes, checksum: 3a294fe9241ea40abe6cc0015645fc5e (MD5) license_rdf: 805 bytes, checksum: 4460e5956bc1d1639be9ae6146a50347 (MD5) Previous issue date: 2021-02-24Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqporUniversidade Federal de GoiásPrograma de Pós-graduação em Odontologia (FO)UFGBrasilFaculdade de Odontologia - FO (RG)Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessPolimerizaçãoResinas compostasMateriais dentáriosDentísticaPolymerizationComposite resinsDental materialsDentistryCIENCIAS DA SAUDE::ODONTOLOGIAAnálise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LEDAnalysis of mechanical properties, degree of conversion and depth of polymerization of polymerized compound resin with different LED photoactivating unitsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis75500500500500211800reponame:Repositório Institucional da UFGinstname:Universidade Federal de Goiás (UFG)instacron:UFGORIGINALTese - Thallita Monteiro Teixeira - 2021.pdfTese - Thallita Monteiro Teixeira - 2021.pdfapplication/pdf3007226http://repositorio.bc.ufg.br/tede/bitstreams/bc8b1212-9147-4cf9-8111-479ece1cac2c/download3a294fe9241ea40abe6cc0015645fc5eMD53LICENSElicense.txtlicense.txttext/plain; charset=utf-81748http://repositorio.bc.ufg.br/tede/bitstreams/a6d37d8e-02cf-4510-9b22-82784de18052/download8a4605be74aa9ea9d79846c1fba20a33MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8805http://repositorio.bc.ufg.br/tede/bitstreams/5203d1a7-b452-4183-aaf0-4faaf66afef0/download4460e5956bc1d1639be9ae6146a50347MD52tede/112442021-05-25 18:27:38.26http://creativecommons.org/licenses/by-nc-nd/4.0/Attribution-NonCommercial-NoDerivatives 4.0 Internationalopen.accessoai:repositorio.bc.ufg.br:tede/11244http://repositorio.bc.ufg.br/tedeRepositório InstitucionalPUBhttp://repositorio.bc.ufg.br/oai/requesttasesdissertacoes.bc@ufg.bropendoar:2021-05-25T21:27:38Repositório Institucional da UFG - Universidade Federal de Goiás (UFG)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 |
dc.title.pt_BR.fl_str_mv |
Análise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LED |
dc.title.alternative.eng.fl_str_mv |
Analysis of mechanical properties, degree of conversion and depth of polymerization of polymerized compound resin with different LED photoactivating units |
title |
Análise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LED |
spellingShingle |
Análise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LED Almeida, Laís da Mata Polimerização Resinas compostas Materiais dentários Dentística Polymerization Composite resins Dental materials Dentistry CIENCIAS DA SAUDE::ODONTOLOGIA |
title_short |
Análise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LED |
title_full |
Análise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LED |
title_fullStr |
Análise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LED |
title_full_unstemmed |
Análise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LED |
title_sort |
Análise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LED |
author |
Almeida, Laís da Mata |
author_facet |
Almeida, Laís da Mata |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Veríssimo, Crisnicaw |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/2811678434269373 |
dc.contributor.referee1.fl_str_mv |
Veríssimo, Crisnicaw |
dc.contributor.referee2.fl_str_mv |
Lopes, Lawrence Gonzaga |
dc.contributor.referee3.fl_str_mv |
Soares, Carlos José |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/8502756734277926 |
dc.contributor.author.fl_str_mv |
Almeida, Laís da Mata |
contributor_str_mv |
Veríssimo, Crisnicaw Veríssimo, Crisnicaw Lopes, Lawrence Gonzaga Soares, Carlos José |
dc.subject.por.fl_str_mv |
Polimerização Resinas compostas Materiais dentários Dentística |
topic |
Polimerização Resinas compostas Materiais dentários Dentística Polymerization Composite resins Dental materials Dentistry CIENCIAS DA SAUDE::ODONTOLOGIA |
dc.subject.eng.fl_str_mv |
Polymerization Composite resins Dental materials Dentistry |
dc.subject.cnpq.fl_str_mv |
CIENCIAS DA SAUDE::ODONTOLOGIA |
description |
This study analyzed the irradiance and spectrum by emission spectrophotometry (MARC-RC), characterized the light beams (Beam Profile), as well as determined the Knoop microhardness (KHN), the modulus of elasticity (GPa), the degree of conversion ( %), the flexural strength of 3 points (MPa) and the polymerization depth with elasticity modulus of a composite (Filtek Z350 XT) photopolymerized with 5 different types of LED curing units. Of these, three types were not certified by ANVISA and Inmetro, Dental Wireless (E1), Li A180 (E2) and Lyang Ya (E3), and two with certification, VALO Cordless - Ultradent (VL) and Elipar Deep-Cure L - 3 Oral Care (EL). The characterization was carried out by determining irradiance (mW / cm²), emission spectrum (mW / cm² / nm) and radiant exposure (J / cm²) using the MARC Resin Calibrator (MARC-RC, BlueLight). The Beam Profile of the different photoactivating units was made by means of a laser beam profile reader (Beam Profile). 50 specimens were produced for testing microhardness and modulus of elasticity. Each experimental group was polymerized with a photoactivator unit. Microhardness (KHN) was obtained by averaging five indentations on each surface. The modulus of elasticity was obtained by measuring the major and minor diagonals of each indentation. The degree of conversion was obtained by the FTIR / ATR test with 25 specimens. The 3-point flexural strength test (n = 50) was performed using a load in the center of the sample with a constant speed of 0.5 mm / min until fracture. The maximum load was recorded in Newtons. The depth of polymerization of the restoration was evaluated by Knoop microhardness using the average indentations in the regions: mesial, center and distal of healthy human molars prepared in Class II and restored using an oblique incremental technique. The modulus of elasticity of the polymerization depth of the restoration was obtained in the same way as the previous microhardness test. The test data were subjected to the normality test (Shapiro-wilk) followed by Factor analysis of variance (One-way ANOVA), Two-factor analysis of variance (Two-way ANOVA), Tukey HSD test (α = 0, 05) and multiple linear regression. In all tests, the groups showed statistically significant differences between them (p <0.001). The non-certified units (E1, E2 and E3) presented nonhomogeneous light beam profiles with concentrated irradiance in the center of the active tips. E3 showed greater irradiance when compared to the other photoactivating units. VL and EL showed larger diameters between the different photoactivating units. In the microhardness (KHN) and elastic modulus (GPa) tests, VL presented the highest mean values in both and E1, the lowest mean values. VL showed higher values of degree of conversion (%) when compared to EL and E3. The highest values of flexural strength (MPa) were E3 when compared to the other groups, being statistically similar to the VL and E2 groups. At depths closer to the pulp wall, lower mean values of microhardness and modulus of elasticity were obtained. And, the highest mean values of microhardness and modulus of elasticity were found in the occlusal regions (1mm). The interaction between microhardness and modulus of elasticity showed a very strong and proportional positive correlation according to the different depths tested. The analysis of the tests indicated that between microhardness (KHN) and depth of the restoration, a weak positive correlation was obtained and there was no association with irradiance (mW / cm²). The modulus of elasticity (GPa) was not related to the depth of the restoration and to the irradiance (mW / cm²). |
publishDate |
2021 |
dc.date.accessioned.fl_str_mv |
2021-04-13T17:21:18Z |
dc.date.available.fl_str_mv |
2021-04-13T17:21:18Z |
dc.date.issued.fl_str_mv |
2021-02-24 |
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 |
ALMEIDA, L. M. Análise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LED. 2021. 70. Tese (Doutorado em Odontologia) - Universidade Federal de Goiás, Goiânia, 2021. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/11244 |
identifier_str_mv |
ALMEIDA, L. M. Análise das propriedades mecânicas, grau de conversão e profundidade de polimerização de resinas compostas polimerizadas com diferentes unidades fotoativadoras de LED. 2021. 70. Tese (Doutorado em Odontologia) - Universidade Federal de Goiás, Goiânia, 2021. |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/11244 |
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por |
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por |
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21 |
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180 |
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0 |
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Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
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Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
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openAccess |
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Universidade Federal de Goiás |
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Programa de Pós-graduação em Odontologia (FO) |
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UFG |
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Faculdade de Odontologia - FO (RG) |
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Universidade Federal de Goiás |
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