Degree of Conversion of Luting Resins Around Ceramic Inlays in Natural Deep Cavities: A Micro-Raman Spectroscopy Analysis

2010 ◽  
Vol 35 (5) ◽  
pp. 579-586 ◽  
Author(s):  
U. Lohbauer ◽  
M. Pelka ◽  
R. Belli ◽  
J. Schmitt ◽  
E. Mocker ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Clinical Relevance ◽  
Degree Of Conversion ◽  
Spectroscopy Analysis ◽  
Previous Evidence ◽  
Micro Raman Spectroscopy ◽  
Ceramic Inlays ◽  
Different Depths ◽  
Deep Cavities ◽  
Luting Resins

Clinical Relevance Contrary to previous evidence, the degrees of conversion of resin luting materials have been shown to reach statistically similar values in three different depths around ceramic inlays luted to natural cavities. Both dual-cure and light-cure materials have presented conversion homogeneity, although they have been shown to be material-dependent.

scholarly journals Use of WetSEM® capsules for convenient multimodal scanning electron microscopy, energy dispersive X-ray analysis, and micro Raman spectroscopy characterisation of technetium oxides

2021 ◽  
Author(s):  
D. J. Bailey ◽  
M. C. Stennett ◽  
J. Heo ◽  
N. C. Hyatt
Keyword(s):  
Raman Spectroscopy ◽  
Low Cost ◽  
Powder Materials ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Micro Raman Spectroscopy ◽  
Hazard And Risk ◽  
Sem Imaging ◽  
General User ◽  
532 Nm

AbstractSEM–EDX and Raman spectroscopy analysis of radioactive compounds is often restricted to dedicated instrumentation, within radiological working areas, to manage the hazard and risk of contamination. Here, we demonstrate application of WetSEM® capsules for containment of technetium powder materials, enabling routine multimodal characterisation with general user instrumentation, outside of a controlled radiological working area. The electron transparent membrane of WetSEM® capsules enables SEM imaging of submicron non-conducting technetium powders and acquisition of Tc Lα X-ray emission, using a low cost desktop SEM–EDX system, as well as acquisition of good quality μ-Raman spectra using a 532 nm laser.

Depth-dependence of Degree of Conversion and Microhardness for Dual-cure and Light-cure Composites

2019 ◽  
Vol 45 (4) ◽  
pp. 396-406 ◽  
Author(s):  
R Wang ◽  
Y Wang
Keyword(s):  
Room Temperature ◽  
Degree Of Conversion ◽  
Light Irradiation ◽  
Surface Microhardness ◽  
Raman Spectroscopic ◽  
Micro Raman Spectroscopy ◽  
Test Conditions ◽  
Significant Difference ◽  
Entire Depth ◽  
Different Depths

Clinical Relevance New dual-cure bulk-fill composites show promise for uniform degree of conversion and microhardness throughout the entire depth of direct restorations. SUMMARY Objective: The aim of this study was to evaluate the degree of conversion (DC) through micro-Raman spectroscopy and surface microhardness in Vickers hardness (VHN) of three new dual-cure bulk-fill resin-based composites (RBCs) compared with light-cure bulk-fill and incremental RBCs at two clinically relevant depths and for two light irradiation times. Methods: Three commercially available restorative dual-cure bulk-fill RBCs (BulkEZ, HyperFIL, and Injectafil) were evaluated and compared with three light-cure RBCs (Filtek Bulk Fill Flowable, Filtek One Bulk Fill, and incremental Filtek Z250) as controls. Specimens were prepared in two different depths (0.5 mm and 5 mm) and were light irradiated for 20 seconds or 40 seconds. Self-cure was also evaluated for the three dual-cure bulk-fill RBCs. Micro-Raman spectroscopic measurements and VHN tests (n=5) were made after 24 hours of dry storage in the dark at room temperature for all test conditions. Data were analyzed using one-way and two-way analyses of variance (α=0.05). Results: All tested RBCs showed significantly higher DC and VHN values at 0.5-mm depth than at 5-mm depth, with the exception of BulkEZ, which showed similar DC and VHN values at two depths. The three dual-cure bulk-fill RBCs showed significantly higher DC than the three light-cure RBCs under the same curing condition. The three dual-cure RBCs showed much smaller differences in VHN values between the two depths than the three light-cure RBCs. Twenty seconds and 40 seconds of light irradiation did not generate significant difference in DC and VHN values for the three dual-cure bulk-fill RBCs at either depth or for the three light-cure RBCs at the 0.5-mm depth; however, 40 seconds of light irradiation generated significantly higher DC and VHN values for One Bulk Fill and Z250 at the 5-mm depth compared with 20 seconds of light irradiation.

Micro-Raman spectroscopy analysis of 16th century Portuguese Ferreirim Masters oil paintings

2009 ◽  
Vol 40 (12) ◽  
pp. 2135-2143 ◽  
Author(s):  
Maria-João Benquerença ◽  
N. F. C. Mendes ◽  
E. Castellucci ◽  
Vítor M. F. Gaspar ◽  
Francisco P. S. C. Gil
Keyword(s):  
Raman Spectroscopy ◽  
16Th Century ◽  
Spectroscopy Analysis ◽  
Oil Paintings ◽  
Micro Raman Spectroscopy

Micro-Raman spectroscopy analysis of the 17th century panel painting ‘Servilius Appius’ by Isaac van den Blocke

2014 ◽  
Vol 45 (11-12) ◽  
pp. 1019-1025 ◽  
Author(s):  
Ewa Pięta ◽  
Edyta Proniewicz ◽  
Bożena Szmelter-Fausek ◽  
Justyna Olszewska-Świetlik ◽  
Leonard M. Proniewicz
Keyword(s):  
Raman Spectroscopy ◽  
17Th Century ◽  
Spectroscopy Analysis ◽  
Micro Raman Spectroscopy ◽  
Panel Painting
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