STUDI KEKASARAN PERMUKAAN RESIN KOMPOSIT NANOFILLER SETELAH PERENDAMAN DALAM SEDUHAN KOPI ARABIKA GAYO

Abstract

Nanofilled composite resin has a filler particles in the nanometer range, so that can improve physical
properties and enhance esthetics. Surface roughness of nanofilled composite resin are measured from
the condition of material that can absorp the solution. Water absorption is determined by solution of
immersion. Gayo arabica coffee is one of immersion that can be absorbed by nanofilled composite resin
and contain of acids. The aim of this study is to determine the surface roughness value of nanofilled
composite resin after immersion in gayo arabica coffee. There were 10 specimens of nanofilled
composite resin (merk Filtek Z350 XT) with cylinder size (d=10 mm; t=2 mm). Each specimen was
initially immersed in distilled water at 37
o
C for 24 hours and its initial roughness was measured using
surface roughness tester. Then, specimens were immersed in gayo arabica coffee at 55
C for 4 days.
After immersion, all specimens were measured using surface roughness tester to determine the final
roughness. The data was analyzed using paired t-test with significant value is p<0.05. The result
showed there was significant difference of surface roughness before and after immersion in gayo
arabica coffee. The conclusion of this study there was increased in surface roughness nanofilled
composite resin after immersion in gayo arabica coffee.
Keywords : nanofilled composite resin, surface roughness, gayo arabica coffee.