Effect of cigarette smoke on color stability and surface roughness of dental composites
Volume 41, Supplement 3, August 2013, Pages e73–e79
Journal of Color and Apperance in Dentistry
Abstract
Objective
To evaluate the color stability and surface roughness of 3 dental composites subjected to cigarette smoke and brushing.
Methods
Twenty
specimens were prepared for each type of restorative material used:
nanohybrid (Tetric N-Ceram); hybrid (Z250-3M ESPE) and silorane-based
microhybrid (Filtek P90-3M ESPE), which were divided into 2 groups (n = 10),
according to the type of finishing/polishing received: Group 1 – papers
with decreasing abrasive grit and Group 2 – polyester matrix (without
polishing). After initial readouts of color (Easy Shade-VITA) and
surface roughness (SJ-201P Mitutoyo), specimens were subjected to action
of smoke from 20 cigarettes, (Marlboro Red–Philip Morris). After each
cigarette, the samples were submitted to brushing in a standardised
device. After this, final readouts were taken to calculate change in
color (ΔE and ΔL) and roughness (ΔRa), which were statistically analysed
(2-way ANOVA, Bonferroni, and Student's-t tests respectively, p < 0.05).
Results
Tetric
N-Ceram presented color change at clinically unacceptable levels
(ΔE > 3.3) when the polyester strip was used for finishing, a result
differing (p < 0.05) from those of the other composites, which presented no difference between them (p > 0.05). Unpolished composites presented higher Ra values than those that were polished (p < 0.05), with exception of the silorane based composite.
Conclusion
Absence
of polishing increases cigarette capacity to stain composites and
surface roughness of composites, with exception of the silorane based
type.
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