| Summary: | Surface roughness of a restoration is affected by oral conditions, such as
saliva.. Saliva pH of each individual can be categorized as acid, neutral and
alkaline. The purpose of this study was to compare the surface roughness of
methacrylate and silorane resin composite, which was soaked in saliva with
different pH of 5.6 and 6.8.
Twenty silorane resin composite and 20 methacrylate resin composite,
which were applied within cylindrical mold ( diameter: 5 mm, height: 2 mm )
were divided into four groups of 10 each, then all the specimens were immersed
in saliva for 14 days. The first group of 10 cylindrical silorane soaked in saliva
with ph 5.6, the second group of 10 cylindrical silorane soaked in saliva with pH
6.8, the third group of 10 cylindrical methacrylate soaked in saliva with pH 5.6,
the fourth groups of 10 cylindrical methacrylate soaked in saliva with pH 6.8. All
specimens were then thermocycled using a water bath with temperature of 4 0C
and 60 0C. Afterwards, surface roughness (Ra) of each specimen was measured
using surface roughness measuring instrument (Surfcom 120A). Data was then
analyzed using two way ANOVA with 95% confidence level (α=0,05).
The results showed that methacrylate resin composite, which was soaked
in saliva of pH 5.6 was the highest in surface roughness (0.84 ± 0.15 micron),
while silorane resin composite, which was soaked in saliva of pH 6.8 was the
lowest in surface roughness (0.22 ± 0.15 micron). Two way ANOVA analysis
showed that the type of resin composite had a significant influence on the surface
roughness (p< 0.05), whereas a pH of saliva had no significant influence on the
surface roughness (p> 0,05). It can be concluded that the differences occurred on
the surface roughness between silorane and methacrylate resin composite.
Methacrylate resin composite had a greater surface roughness than silorane at
either pH of 5.6 or 6.8. In addition, pH of saliva had no influence on the surface
roughness.
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