Available online 27 July 2012
Abstract
Objectives
The
aim of this study was to evaluate the effects of staining solutions on
the colour stability of self-cure provisional resin materials.
Methods
The
specimens were prepared for each of three auto-polymerized bis-acryl
resin and auto-polymerized methyl methacrylate provisional resin
material. The baseline colour values were measured with a colorimeter
according to the CIE L*a*b* colour scale. After the first measurement (T0),
specimens were placed in staining solutions (coffee, coca-cola, burn
and distilled water for control group) and the other measurements were
taken after 24 h (T1), 1 week (T2) and 4 weeks (T3).
Results
Data
were analyze statistically by (a) repeated measures (ANOVA), (b) one
and two way ANOVA, and (c) Tukey HSD multiple comparison tests. At the
24 h immersion period, the post hoc analysis indicated that
AccessCrown-coffee revealed the highest ΔE* values (4.4). At the second immersion period (1 week), Structur2 SC-coffee had the highest ΔE* values compared with other materials (5.4).
Conclusions
The
degrees of discoloration were increased with immersion time. The
methylmethacrylate resin was more resistant to discoloration than
bis-acryl resins. After immersion for 30 days, the coffee solution
resulted in unacceptable discoloration for all the tested materials.
No comments:
Post a Comment