Accelerated Artificial Aging
Mostrando 13-24 de 27 artigos, teses e dissertações.
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13. Color alteration of the paint used for iris painting in ocular prostheses
The purpose of this study was to assess color alteration of the paints used for iris painting in artificial eyes. Five disks of heat cured acrylic resin were confectioned by microwave energy for each paint analyzed, in a total of 40 specimens. Each specimen consisted of a colorless acrylic resin disk and another of equal size, of scleral white colored acryli
Brazilian Oral Research. Publicado em: 2009-12
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14. Effect of the artificial accelerated aging on optical properties and conversion degree of expired composites / Efeito do envelhecimento artificial acelerado sobre as propriedades opticas e a conversão monomerica de compositos vencidos
Presently, the excellent aesthetic results obtained with composites require the dentist to use several composite resin hues to make a restoration. Nonetheless, to do this, little material is used, and many times, due to this low usage, the composite reaches its expiration date with material remaining in the packaging. The purpose of this study was to evaluat
Publicado em: 2009
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15. ASPECTOS FISIOLÃGICOS E BIOQUÃMICOS DA MATURAÃÃO DE SEMENTES DE PIMENTÃO. / Physiological and biochemical aspects of the maturation of sweet pepper seeds
The determination of the appropriate point or interval for the harvest of fruits for sweet pepper seed production is fundamental for success in production programming, as well as for obtaining quality seeds. From their physiological maturity period up to the moment they are used for sowing, the seeds are subject to loss of physiological quality due to the oc
Publicado em: 2009
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16. Changes physiology and biochemistry of seeds of Melanoxylon brauna during deterioration / Alterações fisiológicas e bioquímicas de sementes de Melanoxylon brauna envelhecidas natural e artificialmente
The knowledge at present about the biochemical and physiologic changes in forest tree seeds is limited, as well as those of vigour evaluation testes during this stage. The objective of this work was to evaluate the physiological and biochemical changes of Melanoxylon brauna seeds during storage and the accelerated aging, establishing relations between these
Publicado em: 2008
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17. Priming in sunflower achenes, under termic and droguht stresses. / Condicionamento fisiológico de aquênios de girassol, sob estresses térmico e hídrico.
Sunflower production may be influenced by plant density, requiring uniformity in the initial growth phase. This may be influenced by water availability, as well as by soil temperature from germination through emergence. The priming technique has been used to reduce the period between germination and seedling emergence in the filed, providing better performan
Publicado em: 2008
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18. Evaluation of color and opacity of direct composites protected with surface sealants submitted to accelerated artificial aging / Avaliação da cor e opacidade de compósitos diretos protegidos com selantes de superfície submetidos ao envelhecimento artificial acelerado
A estabilidade de cor é crucial para o sucesso de qualquer tipo de restauração estética, pois a alteração de cor das resinas é o maior motivo para as trocas das restaurações anteriores. O objetivo desse trabalho foi avaliar similaridade de cor, sua estabilidade e opacidade de três compósitos diretos (TPH - Dentsply; Charisma - Heraus Kulzer; Conce
Publicado em: 2008
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19. Evaluation of radiopacity and microhardness of composites submitted to artificial aging
The purpose of this study was to assess the radiopacity and microhardness of different types of resin-based composites (RBC - hybrid; microhybrid; flowable; cement and polyacid modified) before and after being submitted to artificial accelerated aging. Fifty specimens (7 mm in diameter and 2 mm thick) were fabricated, 10 for each material. The specimens were
Materials Research. Publicado em: 2007-09
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20. Evaluation of the influence of the accelerated artificial aging and storage in 1.23% acidulated phosphate fluoride over superficial roughness and color stability of two low-fusing dental ceramics to commercially pure titanium / Avaliação da influência do envelhecimento artificial acelerado e armazenamento em fluorfosfato acidulado a 1,23% na rugosidade superficial e na alteração de cor de cerâmicas odontológicas de ultra-baixa fusão para titânio comercialmente pur
The purpose of this study was to evaluate the influence of accelerated artificial aging and of 1.23% acidulated phosphate fluoride over superficial roughness and color stability of two low-fusing dental ceramics for titanium (Triceram- Dentaurum, and Noritake Ti22- Noritake), metal-free or metalceramics using commercially pure titanium (Tritan- Dentaurum). 8
Publicado em: 2007
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21. Influência do envelhecimento artificial acelerada sobre a estabilidade de cor, opacidade e densidade das ligações cruzadas de compósitos odontológicos armazenados em diferentes ambientes e tempos de armazenagem / Influence of artificial accelerated aging on color stability, opacity and cross-link density of dental composites stored in different environment and over different times
The evolution of composite resins, allied to their characteristic of restoring the natural appearance of teeth regarding color and opacity, makes them one of the main materials of choice among the restorative materials used in dentistry. Color and opacity stability assume a crucial role in a successful aesthetic restoration treatment, since changes in these
Publicado em: 2007
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22. "In vitro" study of color stability and opacity of five ceramic systems under influence of accelerated aging / Estudo in vitro da estabilidade de cor e opacidade de cinco sistemas cerâmicos sob influência do envelhecimento artificial acelerado
O objetivo deste estudo foi avaliar a estabilidade de cor e opacidade de cinco sistemas cerâmicos glazeados naturalmente e com pintura extrínseca, utilizando os espectrofotômetros Color Guide 45/0 (BYK-Gardner) e Easyshade (Vita), sob influência do envelhecimento artificial acelerado. Foram confeccionados 14 corpos de prova para cada grupo testado de cer
Publicado em: 2007
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23. Failure analysis of the polymeric external layer of the umbilical cables. / Análise de falha da camada polimérica externa de cabos umbilicais.
In the present work is proposed a method to establish a failure criterion of the polymeric external layer of umbilical cables used in offshore operations. The proposed method is based on the determination of the increment of the quantity of absorbed water by the polymeric external layer of the cable due to deterioration caused by cyclic loads and the aging p
Publicado em: 2007
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24. Avaliação da resistência à abrasão, microdureza superficial e estabilidade de cor de dentes artificiais de resina acrílica / Evaluation of the abrasion resistance, superficial microhardness and color stability of acrylic resin artificial teeth.
The objective of this work was to evaluate in vitro the abrasion resistance, the superficial microhardness and the color stability of acrylic resin artificial teeth. Seven groups (1-Biolux, 2 - Trilux, 3 - Blue Dent, 4 - Biocler, 5 - Orthosit-Vivodent, 6 - Postaris-Antaris, 7 - Gnathostar-Ivostar), composed of 12 upper premolar for each manufacturers, being
Publicado em: 2007