| Summary: | Fiber Reinforced Composite is a material made of matrix that is reinforced
by fibers and coupling agent as a binder. The use of FRC in the oral environment
involves the interaction between the FRC and saliva with pH variation, which
could be Acidic pH. Acid condition could reduce flexural strength of FRC, this is
due to the matrix degradation process in acid condition. The aim of this study was
to evaluate the effect of acidic pH on flexural strength of fiber reinforced
composite with UHMWPE fibers.
Twelve bar shaped speciments of 25 mm x 2 mm x 2 mm were cured by
LED curing unit, then divided into three groups. Three speciment groups were
immersed in artificial saliva with pH variatons (2.5, 4.5, 5.5) and stored in
incubator at 37ºC for 14 days. The solutions were changed daily to keep the acidic
pH stable. The Flexural strength measured using universal testing machine, the
speed was 1 mm/minute and the distance between was 20 mm according to ISO
10477. The value of flexural strength then analyzed using one way ANOVA and
LSD0,05.
The mean flexural strength of FRC with pH 2.5, 4.5, 5.5 Immersion were
49.53±1.53 MPa, 70.68±1.77 MPa, 74.19±2.32 MPa. ANOVA analysis revealed a
significant influence of acidic pH and flexural strength (p<0.05). LSD showed
significant differences between all treatment groups. Conclusion of this study is
acidic pH had a significant influence on the decrease of fiber reinforced composite
with UHMWPE fiber flexural strength. The lower flexural strength obtained at pH
2,5 immersion.
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