Raman Spectrometer
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Radiant exposure effects on physical properties of methacrylate - and silorane-composites
AIM: To evaluate the effect of different radiant exposures on the degree of conversion (DC), Knoop hardness number (KHN), plasticization (P), water sorption (WS), and solubility (S) of different monomer resin-based composites. METHODS: Circular specimens (5 x 2 mm) were manufactured from methacrylate and silorane composite resins, and light-cured at 19
Braz. J. Oral Sci.. Publicado em: 2014-09
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2. Effects of various hydrogen peroxide bleaching concentrations and number of applications on enamel
AIM: To evaluate the effects of three hydrogen peroxide (HP) concentrations on enamel mineral content (MC), following three peroxide applications and using three methods to measure the MC. METHODS : Forty samples were obtained from bovine incisors and randomly divided into 4 groups (n=10). The control group remained untreated, while the experimental gro
Braz. J. Oral Sci.. Publicado em: 2014-03
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3. 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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4. The adhesive system and root canal region do not influence the degree of conversion of dual resin cement
OBJECTIVES: The aim of this study was to evaluate the influence of two adhesive systems and the post space region on the degree of conversion of dual resin cement and its bond strength to root dentin. MATERIAL AND METHODS: One three-step etch-and-rinse (All-bond 2, Bisco) and another one-step self-etch (Xeno III, Dentsply) adhesive systems were applied on 20
J. Appl. Oral Sci.. Publicado em: 2010-10
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5. "Avaliação da resistência flexural, microinfiltração e grau de conversão de uma resina composta fotoativada com luz halógena e laser de argônio" / Evaluation of the flexural strenght, microleakage and degree of convertion of a composite resin photocured with argon laser and halogen lamp.
Nesta pesquisa foi avaliado a resistência flexural, a microinfiltração e o grau de conversão de uma resina composta micro-híbrida fotoativada por laser de argônio e luz halógena. Para o teste de resistência flexural e grau de conversão foram preparadas cinco amostras de 25 X 2 X 2mm de acordo com a norma ISO 4049. Os parâmetros de fotoativação ut
Publicado em: 2007
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6. Monomer conversion of composite dental resins photoactivated by a halogen lamp and a LED: a FT-Raman spectroscopy study
Eighteen circular blocks of resins cured either by a LED or a halogen lamp (20, 40 and 60 s), had their top (T) and bottom (B) surfaces studied using a FT-Raman spectrometer. Systematic changes in the intensity of the methacrylate C=C stretching mode at 1638 cm-1 as a function of exposure duration were observed. The calculated degree of conversion (DC) range
Química Nova. Publicado em: 2005-03
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7. CARACTEREZITION OF GASOLINES BY FT-RAMAN SPECTROSCOPY / CARACTERIZAÇÃO DE GASOLINAS POR ESPECTROSCOPIA FT- RAMAN
The aim of this work was to determine the contents of the more important components and physical properties of commercial gasolines and synthetic mixtures with known composition, prepared in the laboratory. The Raman spectra of 60 gasolines and 52 mixtures were acquired with a Nicolet 950 Fourier Transform Raman (FT-Raman) spectrometer. The raw spectra were
Publicado em: 2003
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8. Automated laser-scanning-microbeam fluorescence/Raman image analysis of human lens with multichannel detection: evidence for metabolic production of a green fluorophor.
A laser-microprobe fluorescence/Raman spectrometer with a 700-channel detector has been constructed and applied to the collection of data on the distribution of a green fluorophor throughout the exposed area of a human lens sectioned along the visual axis. The area (approximately 6.5 X 9.5 mm) covering the lens section was scanned automatically by the microp
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9. Transient fluorescence in synchronously dividing Escherichia coli.
Using a spectrometer equipped with an optical multichannel analyzer as the detector, we observed the Stokes laser-Raman spectra of metabolically synchronous Escherichia coli from 100 to 2100 cm-1. After more than 400 separate recordings, at cell concentrations of 10(7)-10(8) per ml, no Raman lines attributable to the metabolic process nor to the cells themse