| dc.description.abstract | Nanofilled composite resin is a restorative material that can withstand mastication force in the posterior
region. The compressive strength of composite resin is influenced by beverages consumption. Robusta coffee is the
most consumed beverages by Indonesian society. It is an acidic-beverage that containing chlorogenic acid,
therefore coffee solution can be expected to increase water absorption and solubility of restorative materials. This
study was aimed to know the effect of robusta coffee solution to the compressive strength of nanofilled composite
resin. Samples were 64 discs nanofilled composite resin, diameter 5 mm and thickness 2 mm. Samples were divided
into 4 control group (immersed in aquadest) and 4 treatment group (immersed in robusta coffee solution). Every
group contained of 8 samples and immersed for 1, 3, 5, and 7 days. Compressive strength was tested by using
Universal Testing Machine. It showed average compressive strength value of control group was higher than
treatment group. It increased on 3
rd
and 5
th
day then decreased on 7
day. Compressive strength value in teratment
group approximately decreased on 3
rd
, 5
th
, and 7
th
th
day. Nonparametric statisic analysis Kruskal -Wallis and MannWhitney
showed no difference among control group and treatment group (p>0,05) according to immersion time
(days). It concluded that robusta coffee solution decrease the compressive strength of nanofilled composite resin. | en_US |
