Evaluation of phenyl-propanedione on yellowing and chemical-mechanical properties of experimental dental resin-based materials
J. appl. oral sci
; 24(6): 555-560, Nov.-Dec. 2016. tab, graf
Article
in En
| LILACS, BBO
| ID: biblio-841154
Responsible library:
BR1.1
ABSTRACT
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 (6040 wt% BisGMATEGDMA) 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.
Key words
Full text:
1
Index:
LILACS
Main subject:
Polyethylene Glycols
/
Polymethacrylic Acids
/
Bisphenol A-Glycidyl Methacrylate
/
Chalcones
/
Light-Curing of Dental Adhesives
/
Photoinitiators, Dental
Type of study:
Evaluation_studies
Language:
En
Journal:
J. appl. oral sci
Journal subject:
ODONTOLOGIA
Year:
2016
Type:
Article