Evaluation of phenyl-propanedione on yellowing and chemical-mechanical properties of experimental dental resin-based materials
In: Journal of Applied Oral Science Journal of Applied Oral Science, Jg. 24 (USP), Heft 6, S. 555-560 Journal of Applied Oral Science v.24 n.6 2016 Journal of applied oral science Universidade de São Paulo
Online
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Zugriff:
Objective To evaluate the influence of phenyl-propanedione on yellowing and chemical-mechanical properties of experimental resin-based materials photoactivated using different light curing units (LCUs). Material and Methods Experimental resin-based materials with the same organic matrix (60:40 wt% BisGMA:TEGDMA) were mechanically blended using a centrifugal mixing device. To this blend, different photoinitiator systems were added in equimolar concentrations with aliphatic amine doubled by wt%: 0.4 wt% CQ; 0.38 wt% PPD; or 0.2 wt% CQ and 0.19 wt% PPD. The degree of conversion (DC), flexural strength (FS), Young’s modulus (YM), Knoop hardness (KNH), crosslinking density (CLD), and yellowing (Y) were evaluated (n=10). All samples were light cured with the following LCUs: a halogen lamp (XL 2500), a monowave LED (Radii), or a polywave LED (Valo) with 16 J/cm2. The results were analysed by two-way ANOVA and Tukey’s test (α=0.05). Results No statistical differences were found between the different photoinitiator systems to KNH, CLS, FS, and YM properties (p≥0.05). PPD/CQ association showed the higher DC values compared with CQ and PPD isolated systems when photoactivated by a polywave LED (p≤0.05). Y values were highest for the CQ compared with the PPD systems (p≤0.05). Conclusion PPD isolated system promoted similar chemical and mechanical properties and less yellowing compared with the CQ isolated system, regardless of the LCU used.
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Evaluation of phenyl-propanedione on yellowing and chemical-mechanical properties of experimental dental resin-based materials
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Autor/in / Beteiligte Person: | Mário Alexandre Coelho Sinhoreti ; William Cunha Brandt ; Eduardo José Souza-Junior ; Dayane Carvalho Ramos Salles de Oliveira ; Ana Rosa Costa Correr ; Dobson, Adam |
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Zeitschrift: | Journal of Applied Oral Science Journal of Applied Oral Science, Jg. 24 (USP), Heft 6, S. 555-560 Journal of Applied Oral Science v.24 n.6 2016 Journal of applied oral science Universidade de São Paulo |
Veröffentlichung: | FapUNIFESP (SciELO), 2016 |
Medientyp: | unknown |
ISSN: | 1678-7757 (print) |
DOI: | 10.1590/1678-775720160058 |
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