Halogen Light Light Emitting
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. Shear bond strength of orthodontic brackets bonded using halogen light and light-emitting diode at different debond times
The aim of this in vitro study was to compare the photoactivation effects of QTH (Quartz-Tungsten-Halogen) and LED (Light-Emitting Diode) on the SBS (Shear Bond Strength) of orthodontic brackets at different debond times. Seventy-two bovine lower incisors were randomly divided into two groups according to the photoactivation system used (QTH or LED). The ena
Brazilian Oral Research. Publicado em: 2010-03
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14. Effect of different light-curing devices and aging procedures on composite knoop microhardness
The aim of this study was to evaluate the effect of light-curing devices (Halogen/HAL, Light Emitting Diodes/LED, Argon Laser/LAS and Plasma Arc/PAC) and aging procedures (Mechanical Cycling/MC, Thermal Cycling/TC, Storage/S, MC+TC and MC+TC+S) on the micro-hardness of bottom/B and top/T surfaces of 2-mm-high composite resin cylinders. The Knoop microhardnes
Brazilian Oral Research. Publicado em: 2009-12
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15. Effect of light-curing method and indirect veneering materials on the Knoop hardness of a resin cement
This study evaluated the Knoop hardness of a dual-cured resin cement (Rely-X ARC) activated solely by chemical reaction (control group) or by chemical / physical mode, light-cured through a 1.5 mm thick ceramic (HeraCeram) or composite (Artglass) disc. Light curing was carried out using conventional halogen light (XL2500) for 40 s (QTH); light emitting diode
Brazilian Oral Research. Publicado em: 2009-06
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16. Effect of light curing unit on resin-modified glass-ionomer cements: a microhardness assessment
OBJECTIVE: To evaluate the microhardness of resin-modified glass-ionomer cements (RMGICs) photoactivated with a blue light-emitting diode (LED) curing light. MATERIAL AND METHODS: Thirty specimens were distributed in 3 groups: Fuji II LC Improved/GC (RM1), Vitremer/3M ESPE (RM2) and Filtek Z250/ 3M ESPE (RM3). Two commercial light-curing units were used to p
Journal of Applied Oral Science. Publicado em: 2009-06
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17. DUREZA KNOOP DE UMA RESINA COMPOSTA: INFLUÊNCIA DA FOTOATIVAÇÃO POR LUZ HALÓGENA OU LED, DO TEMPO DE ARMAZENAGEM E DO LOCAL DE MEDIÇÃO / Composite Microhardness: Halogen or LED Fotoactivation, Elapsed Time and Microhardness Reading Location influence
This study aimed to investigate the influence of the reading location, expended time and light source on the Knoop hardness values of a composite resin. For that purpose, an hybrid composite Filtek Z250 - UD (3M/ESPE) was used. The preparation of 40 Cylindrical samples, 6mm in diameter and 2mm high was carried out in a stainless steel matrix. Samples was fot
Publicado em: 2009
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18. In vitro study of the pulp chamber temperature rise during light-activated bleaching
This study evaluated in vitro the pulp chamber temperature rise induced by the light-activated dental bleaching technique using different light sources. The root portions of 78 extracted sound human mandibular incisors were sectioned approximately 2 mm below the cementoenamel junction. The root cavities of the crowns were enlarged to facilitate the correct p
Journal of Applied Oral Science. Publicado em: 2008-10
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19. 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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20. The effect of different light-curing units on tensile strength and microhardness of a composite resin
The aim of this study was to evaluate the influence of different light-curing units on the tensile bond strength and microhardness of a composite resin (Filtek Z250 - 3M/ESPE). Conventional halogen (Curing Light 2500 - 3M/ESPE; CL) and two blue light emitting diode curing units (Ultraled - Dabi/Atlante; UL; Ultrablue IS - DMC; UB3 and UB6) were selected for
Journal of Applied Oral Science. Publicado em: 2007-12
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21. Shear bond strength of metallic brackets photo-activated with light-emitting diode (LED) at different exposure times
The purpose of this study was to compare the shear bond strength of orthodontic metallic brackets photo-activated with two different light-curing sources at different exposure times: halogen light (XL 1500, 3M ESPE) and LED light (Ortholux, 3M Unitek). Sixty bovine permanent lower incisors were inserted into PVC tubes containing plaster. The buccal surfaces
Journal of Applied Oral Science. Publicado em: 2007-10
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22. Avaliação clínica e laboratorial de resina composta em função da fotoativação com diferentes fontes de luz e densidades de potência / Clinical and laboratorial evaluation of resin composite light-cured with different curing units and power densities
The aim of this study was to evaluate the clinical and laboratorial performance of a resin composite light-cured with different light-curing units and power densities, at a standard energy density level. Degree of conversion of the resin composite was determined by Fourier transformed infrared spectroscopy. The degree of softening of the resin composite in e
Publicado em: 2007
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23. Color stability of composites subjected to accelerated aging after curing using either a halogen or a light emitting diode source
O objetivo deste estudo foi verificar a estabilidade de cor de três compósitos polimerizados com dois tipos de unidades polimerizadoras, luz halógena ou diodo emissor de luz (LED). Quarenta amostras (20 mm de diâmetro por 2 mm de espessura) foram construídas com cada compósito (Tetric Ceram®, Heliomolar® and Esthet-X®), vinte na cor A3 e vinte na co
Brazilian Dental Journal. Publicado em: 2007
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24. Avaliação do efeito da indução de polimerização com diferentes fontes de luz e dos meios de envelhecimento sobre a microdureza de cilindros de resina composta / Evaluation of the induction of polymerization effect with different light sources and aging procedures on resin composite microhardness
The aim of this study was to evaluate the effect of the light-curing devices (Halogen/HAL, Light Emitting Diodes/LED, Argon Laser/LAS and Plasma Arc/PAC) and aging procedures on the microhardness of bottom and top surfaces of resin composite cylinders with 4mm height, submitted to thermal and mechanical cycles, and one year storage. For this study 200 specim
Publicado em: 2007