Led Lamp
Mostrando 13-24 de 35 artigos, teses e dissertações.
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13. Post-curing conversion kinetics as functions of the irradiation time and increment thickness
Objective: This study evaluated the variation of conversion degree (DC) in the 12 hours following initial photoactivation of a low-shrinkage composite resin (Venus Diamond). Material and Methods: The conversion degree was monitored for 12 hours using Attenuated Total Reflection (ATR) F-TIR Spectroscopy. The composite was placed in 1 or 2 mm rings and cure
J. Appl. Oral Sci.. Publicado em: 2013-04
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14. Análise, projeto e implementação de um conversor com ampla faixa de tensão de entrada aplicado a iluminação de estado sólido
Currently research has pointed to LEDs as the technology more efficient and durable to be used in lighting, however, it requires a static converter in order to control the electrical current flowing through the LED lamp. In this context, this work present the analysis, design and implementation of a DC/DC converter with wide input voltage range called Boost-
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/05/2012
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15. Effect of light sources and curing mode techniques on sorption, solubility and biaxial flexural strength of a composite resin
Adequate polymerization plays an important role on the longevity of the composite resin restorations. OBJECTIVES: The aim of this study was to evaluate the effect of light-curing units, curing mode techniques and storage media on sorption, solubility and biaxial flexural strength (BFS) of a composite resin. MATERIAL AND METHODS: Two hundred and forty specime
Journal of Applied Oral Science. Publicado em: 2012-04
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16. Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs
OBJECTIVE:This study aimed at evaluating the degree of conversion (DC) of four composite resins, being one nanofilled and 3 microhybrid resins, photo-activated with second- and third-generation light-emitting diodes (LEDs). MATERIAL AND METHODS: Filtek TM Z350 nanofilled composite resins and Amelogen® Plus, Vit-l-escenceTM and Opallis microhybrid resins wer
Journal of Applied Oral Science. Publicado em: 2012-04
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17. Knoop microhardness and FT-Raman evaluation of composite resins: influence of opacity and photoactivation source
The aim of this study was to evaluate the degree of conversion by Knoop microhardness (KHN) and FT-Raman spectroscopy (FTIR) of one nanofilled (Filtek Supreme-3M-ESPE [FS]) and one microhybrid composite (Charisma-Heraeus-Kulzer [CH]), each with different opacities, namely enamel, dentin, and translucent, which were photo-activated by a quartz-tungsten-haloge
Brazilian Oral Research. Publicado em: 2011-06
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18. Efeito fotoiniciador sobre propriedades físicas, mecânicas e térmicas de compósitos experimentais fotoativados por luz de lâmpada halógena e LEDs / Effect of the photo-initiator on physical, mechanics and thermal properties of experimental composites photo-activated for halogen lamp and LEDs
The aim of this study was to analyze the spectrum of different lightcuring units (LCUs) and photo-initiators and yours influence in the physical and thermal properties and bond strength (BS) of experimental resin composites with different photo-initiators. A blend with BisGMA, UDMA, BisEMA, TEGDMA and 65 wt% of silanated filler particles was prepared with CQ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/08/2010
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19. Influence of the photoinitiator system and light photoactivation units on the degree of conversion of dental composites
The aim of this study was to observe the influence of two light polymerization units (LED or halogen light) on the degree of conversion (DC) of three dental composites with lighter shades and a different photoinitiator system. The top (T) and bottom (B) surfaces of 60 discs of composite resin (Filtek™ Supreme, Filtek™ Z250, Tetric™ Ceram Bleach) cured
Brazilian Oral Research. Publicado em: 2010-12
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20. Avaliação da microdureza superficial de resinas compostas à base de metacrilato e silorano fotopolimerizadas com fontes de luz halógena e LED, em diferentes profundidades / Evaluation of the surface microhardness at different depths of methacrylate and silorane based composites cured with halogen lamps or LED
The enhanced mechanical properties of composites, as well as superior curing units, allowed the use of such restorative materials with more predictable results. However, it is known that the success of esthetic restorations depends on many factors such the amount and depth of polymerization, the type of curing unit used, the light intensity and the propertie
Publicado em: 2010
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21. Estudo, in vitro, da influência da técnica e do aparelho de fotopolimerização na resistência de união de pinos intra-radiculares / In vitro study of influence of technique and light curing unit in retention force of fiber post system
Objetivo: Este estudo se propõe a verificar a influencia do tipo de luz fotopolimerizadora na força de retenção de pinos intra-radiculares, tanto na técnica direta como na direta indireta. Métodos: 40 raízes de dentes bovinos com comprimento de 12 mm foram tratadas endodonticamente e divididas aleatoriamente em 4 grupos de acordo com a técnica de obt
Publicado em: 2010
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22. Knoop hardness analisys of a resin composite activated by halogen lamp and LED, varying the luminous density / Avaliação da microdureza de resina composta polimerizada com fontes de luz halógena e LED, em função da densidade de energia luminosa irradiada
No presente estudo, avaliou-se a microdureza da resina composta Z250 (3M ESPE), quando ativada em diferentes tempos (s), diferentes densidades de potência (mW/cm²), em relação à quantidade de energia irradiada (8, 12 e 16 J/cm²), com a finalidade de estabelecer uma densidade de energia luminosa mínima capaz de polimerizar adequadamente os compósitos.
Publicado em: 2009
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23. Influence of energy density of different light sources on knoop hardness of a dual-cured resin cement
The purpose of this study was to evaluate the Knoop hardness of a dual-cured resin-based luting cement irradiated with different light sources as well energy density through a ceramic sample. Three light-curing unit (LCUs) were tested: tungsten halogen light (HAL), light-emitting diode (LED) and xenon plasma-arc (PAC) lamp. Disc-shaped specimens were fabrica
Journal of Applied Oral Science. Publicado em: 2008-06
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24. Evaluation of different on tooth bleaching : in vitro study / Avaliação de diferentes catalisadoores no clareamento dental : estudo in vitro
The aim of this in vitro study was to evaluate the bleaching efficacy of high concentration bleaching agents activated by chemical or physical catalysts. For this, this study was divided in two parts: Experiment 1- evaluated the efficacy of tooth whitening after treatment with 35 % hydrogen peroxide (Whiteness HP Maxx) activated by different light-curing uni
Publicado em: 2008