| Summary: | Restorative dental composites are classified in three types, namely
microfilled, nanofilled and nanohybrid composites. The mechanical properties of
restorative dental composites are influenced by the matrix, filler, polymerization
and a wet oral environment. The aims of this study were to determine and
compare the physical and mechanical properties of three types of commercial
restorative dental composites, study the behavior of the water absorption and its
effect on mechanical properties.
The commercial restorative dental composites used were Solare®X-A3
(microfilled), FiltekTMZ350XT Flow-A3 (nanofilled) and Grandio®Flow-A3
(nanohybrid). The immersion media used were artificial saliva (pH-7) and Coca-
Cola® (pH-3.45). Each specimen was made by acrylic mold and hardened by light
curing for one minute. Before immersion, the mechanical properties were
determined through bending, compressive and fracture toughness tests. The
behavior of water absorption was done by immersion the specimen was in
artificial saliva or Coca-Cola®
Before immersion, Filtek showed the highest bending strength (95.45
MPa), followed by Grandio (59.08 MPa) and Solare (22.62 MPa). Grandio
showed the highest values in compressive strength and fracture toughness (146.46
MPa and 13.28 MPa.mm
media. The weight increase of specimen was
recorded periodically every 1 to 4 days for 38 days. After immersion, the
mechanical properties were determined through bending and compressive tests.
The bending fractured surface and chemical analysis Filtek composite was
observed by scanning electron microscope (SEM) and energy dispersive
spectrometry (EDS), respectively.
1/2), followed by Filtek (120.67 MPa and 7.16
MPa.mm1/2) and Solare (85.37 MPa and 4.26 MPa.mm1/2), respectively. After
immersion, Grandio showed the highest water sorption, followed by Filtek and
Solare. Water absorption decreased the compressive and bending strength of three
types of commercial dental composites. Immersion in Coca-Cola® resulted in the
higher reduction in compressive and bending strength compared to immersion in
artificial saliva.
Key words: Restorative dental composites, water absorption, physical and
mechanical properties
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