Title: Surface roughness of fluoride-releasing restorative materials after topical fluoride application
Abstract: Aim The aim of this study was to assess the effect of a
single application of two topical fluoride agents: NNaF
and APF (2% neutral sodium fluoride gel and 1.23%
acidulated phosphate fluoride gel, respectively) on
the surface roughness (Ra) of Fuji IX GP, Ketac N100,
Vitremer, Dyract AP, Compoglass F and Filtek Ultimate.
Study Design: The effect of NNaF and APF on the surface
roughness of fluoride-releasing restorative materials was
tested on disk-shaped material specimens with a surface
Methods All materials were handled according to
manufacturer’s instructions. ISO standardised specimens
were prepared for each material and then stored in
distilled water for 24 hr. Each sample was polished
with 600 and 1200 grit sandpaper on both sides while
keeping the material surface wet. Ra measurements
were performed on untreated specimens initially and
after 1 min, 4 min and simulated 2-years for both fluoride
applications, respectively. The mean Ra values for all
specimens were measured using a surface profilometer.
Statistics Differences in surface roughness values were
assessed using paired t-test. The differences between
the experimental groups were analysed with one-way
ANOVA; p<0.05 was accepted as statistically significant.
Results The results of the present study indicated
that Ra values for Fuji IX GP and Vitremer increased
significantly after all APF, but not NNaF applications. All tested materials exhibited increased Ra values for both
treatment regimes, but this was not found statistically
Conclusion APF gel application significantly increased
the surface roughness of both Fuji IX GP and Vitremer
for all time periods.