Degree of conversion and cross-link density within a resin-matrix composite
In: Journal of Biomedical Materials Research Part B: Applied Biomaterials, Jg. 106 (2017-07-20), S. 1496-1504
Online
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Zugriff:
The aims of this study were to profile light radiated from two light-curing units (LCUs) and evaluate profile relationship to polymerization patterns within a resin-matrix composite (RMC). Beam profiles of one multiple emission peak light-emitting-diode and one quartz-tungsten-halogen curing-unit were measured using a beam profiler/spectrometer system. A camera-based profiler and an integrating sphere/spectrometer assembly were used to evaluate each LCU beam. Polymerization patterns within a nano-hybrid RMC were investigated using a mapping approach by assessing the degree of conversion utilizing micro-Raman spectroscopy and indirectly estimating cross-link-density by repeated microhardness testing before and after exposure to ethanol (%KH reduction, n = 3). The irradiance received on the top and bottom specimen surfaces from both LCUs was measured using a MARC-RC system. The investigated beam profile area from both LCUs was non-uniform and yielded localized discrepancies in DC (55.7–74.9%) and %KH reduction (26.7–54.1%). The LCU irradiance received at the bottom of the specimens was ∼10% of the top value. This study demonstrated that LCU beam profiles were non-uniform in the area explored. Localized differences in DC and %KH reduction existed throughout the RMC specimens but did not follow a specific pattern. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2017.
Titel: |
Degree of conversion and cross-link density within a resin-matrix composite
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Autor/in / Beteiligte Person: | Megremis, Spiro ; Eckert, George J. ; Afnan O Al-Zain ; Platt, Jeffrey A. ; Lukic, Henry |
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Zeitschrift: | Journal of Biomedical Materials Research Part B: Applied Biomaterials, Jg. 106 (2017-07-20), S. 1496-1504 |
Veröffentlichung: | Wiley, 2017 |
Medientyp: | unknown |
ISSN: | 1552-4973 (print) |
DOI: | 10.1002/jbm.b.33960 |
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