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Doctoral Thesis
DOI
10.11606/T.23.2013.tde-10092013-200103
Document
Author
Full name
Jesuina Lamartine Nogueira Araujo
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Turbino, Miriam Lacalle (President)
Andrade, Alessandra Pereira de
Rodrigues Filho, Leonardo Eloy
Silva, Cecy Martins
Veronezi, Maria Cecilia
Title in Portuguese
Estudo in vitro do efeito de unidades fotoativadoras com diferentes comprimentos de onda na dureza (por meio de micro e ultramicroendentação) e módulo de elasticidade de uma resina composta nanohíbrida
Keywords in Portuguese
Fotoativação
Microdureza Knoop
Módulo de elasticidade
Resina composta
Ultramicrodureza
Abstract in Portuguese
Este trabalho avaliou in vitro a dureza e módulo de elasticidade de uma resina composta nanohíbrida (Tetric N-Ceram/Ivoclair-Vivadent) com diferentes cores, fotoativada por duas unidades com diferentes comprimentos de onda em 3 espessuras (1, 2 e 3mm) comparadas à partir da superfície irradiada (0mm). Os espécimes foram divididos em grupos (n=5): microdureza Knoop-KHN, ultramicrodureza-DUH e módulo de elasticidade-ME, cor (A2 e Bleach-M(BM), fotoativador LEDazul (Elipar Freeligth2/3M(750mW/25s/430-480nm(FL) e LEDazul/violeta Bluephase/Ivoclar/Vivadent (1200mW/cm²/15s/380-515nm(B15) e 30s(B30). Os espécimes foram armazenados por 24h/37ºC. Os ensaios de KHN foram realizados no HMV-2000/Shimadzu, com carga de 25gf/40s, e de DUH e ME no DUH 211S/Shimadzu com força de 10mN e tempo de espera de 0s. Foram realizadas 5 endentações na superfície irradiada (0mm) e na base das amostras (1, 2 e 3mm). A análise estatística foi realizada por ANOVA, Tukey e correlação de Pearson (p<0,01%). O teste de Pearson mostrou haver correlação direta entre a KHN e a DUH. A fonte FL promoveu maiores valores de KHN e de DUH para as duas resinas testadas; enquanto que a fonte B15, promoveu o maior valor de ME. Quanto às espessuras, 0 e 1mm apresentaram maiores valores de KHN e de DUH, e menores de ME que as espessuras de 2 e 3mm. A cor A2 apresentou maior valor de KHN e DUH e menor ME que a cor Bleach-M. Assim, de acordo com a metodologia proposta e os resultados apresentados pode-se concluir que apesar de a luz LEDazul/violeta propor uma maior eficácia na polimerização de resinas de cor clara, no tocante às propriedades avaliadas isso não foi verificado.
Title in English
Effect of light sources with different wavelengths in micro and ultramicrohardness and elastic modulus of a nanohybrid composite resin. An in vitro study
Keywords in English
Composite resin
Elastic modulus
Microhardness
Nanohardness
Photo curing
Abstract in English
This study evaluated in vitro the hardness (micro and ultramicro) and elastic modulus of a nanohybrid composite resin (Tetric N-Ceram/Ivoclar-Vivadent) with different colors, light sources and thickness. The specimens were divided into groups (n=5): KHN-Knoop microhardness, DUH-nanohardness and ME-elastic modulus; colors: A2 and Bleach-M (BM); light sources: LEDblue Elipar Free light 2/3M-ESPE (750mW/cm²/ 25s/430-480nm- (FL)), LEDblue/violet Bluephase/Ivoclar-Vivadent (1.200mw/cm²/15s/380-515nm) (B15) and 30s (B30); thickness: 1mm, 2mm and 3mm, compared to the irradiated surface (0mm). Specimens were stored dry for 24hours at 37ºC after photo curing. Assays were performed at KHN in HMV-2000/ Shimadzu with load of 25gf at 40s and DUH/ME in DUH 211S/Shimadzu with force of 10mN and no hold time (0s). 5 indentations of each test were made in the surfaces opposites to the photo curing. A statistical analysis was performed by ANOVA, Tukey and Pearson correlation (p<0.01%). Pearsons Test showed a direct correlation between KHN and DUH. Comparison between KHN and ME in the studied resins indicated that the light source FL promoted higher values of KHN and DUH to both resins tested, whereas the B15 light source promoted the higher ME value. Regarding thickness 0mm and 1mm showed higher KHN and DUH and lower ME than 2 and 3mm thickness. A2 color showed higher KHN and DUH and lower ME than BM. Thus, according to the proposed methods and the presented results, the LEDblue/violet was not better for curing the light color of the nanohybrid resin, than LEDblue.
 
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Publishing Date
2013-10-23
 
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