Colour stability, staining and roughness of silorane after prolonged chemical challenges
Abstract
Objectives
To
investigate the effect of prolonged chemical challenges on colour
stability, staining susceptibility, and roughness of a silorane
composite material when compared to methacrylate-based composites.
Methods
Initial
colour and roughness were registered for specimens fabricated from
methacrylate or silorane composites. Specimens were individually stored
at 37 °C in 0.02 N citric acid, 0.02 N phosphoric acid, 75% ethanol or
distilled water for 7, 14, 21 and 180 days, when new measurements were
performed. A staining test was performed after the chemical challenge by
immersion in coffee during 3 weeks at 37 °C. Colour changes were
characterized using the CIEL*a*b* colour system. Data
were submitted to analysis of variance for repeated measures, two-way
analysis of variance and Tukey's multiple comparison test (α = 0.05).
Results
Colour
changes on the methacrylate-based resins were considered acceptable
(although significantly different) after immersion in water, citric
acid, phosphoric acid or ethanol, but were unacceptable for the silorane
composite immersed in ethanol for 180 days. The methacrylate-based
resins stored in ethanol were significantly more stained by coffee than
those stored in other media. The silorane composite demonstrated no
staining, but increased roughness, when compared to the
methacrylate-based resins.
Conclusions
No
effect of the immersion solution was noticed on roughness of the
investigated materials. Ethanol influenced colour stability and staining
susceptibility differently for the methacrylate-based and silorane
composites.
Clinical significance
The
knowledge of how acids and solvents affect the properties of
tooth-coloured restorative materials is one of the decision-making
criteria for the selection of a restorative material.
Comments