Evaluation of phenyl-propanedione on yellowing and chemical-mechanical properties of experimental dental resin-based materials

Autor(es)

Ramos Salles de Oliveira, Dayane Carvalho ; Souza-Junior, Eduardo Jose ; Dobson, Adam ; Costa Correr, Ana Rosa ; Brandt, William Cunha ; Coelho Sinhoreti, Mario Alexandre

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Oral Science; v. 24, n. 6, p. 555-560, NOV-DEC 2016.
• Citações Web of Science: 3

Resumo

ABSTRACT 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. (AU)

• Processo FAPESP: 13/04241-2 - Influência do sistema fotoiniciador e agentes redutores nas propriedades físicas de resinas experimentais fotoativadas por LEDs
• Beneficiário: Dayane Carvalho Ramos Salles de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Doutorado