Flexural and
Impact Properties of PMMA Nano Composites and PMMA Hybrids Nano
Composites Used in Dental Applications |
Due to
the enjoyment of poly methyl methacrylate material of
significant advantages in mechanical and physical properties,
which encouraged many researchers in recent years working on the
used it's as a prosthodontic denture
base material. In the present research, efforts are made to
develop the properties of PMMA resin that used for upper and
lower prosthesis complete denture, by addition four different
types of nanoparticles powders, which
are fly ash, fly dust, zirconia and aluminum that added with
different ratios of volume fractions of (1%, 2% and 3%) to poly
methyl methacrylate (PMMA), cold cured resin (castavaria) is
the new fluid resin (pour type) as a matrix. In this
work, the Nano composite and hybrid Nano composite for
prosthetic dentures specimens, preparation was done by using
(Hand Lay-Up) method as six groups which
includes: the first three groups consists of PMMA resin
reinforced by fly ash , fly dust and ZrO2 nanoparticles
respectively, the second three groups consists of three types of
hybrid Nano composites, which includes (
PMMA: X%nF.A)+(1%Al+3%ZrO2)), ((PMMA: X%nF.D)+ (1%Al +
3%ZrO2)) and ((PMMA-nZrO2)+(1%F.A + 3%F.D)) respectively. The
flexural and impact tests results show that the values of the
flexural strength, Maximum Shear
stress, flexural modules, impact strength and fracture toughness
increased with the addition of nano powders (fly ash, fly dust,
zirconia and aluminum). And the results showed that the maximum
values of flexural strength and Maximum shear stress
reaches to 101Mpa and 2.4738Mpa respectively for (PMMA: 2%nF.D)
Nano composite. Moreover, the results showed that the maximum
values of flexural modules for hybrid
Nano composite ((PMMA: 3% nF.A) + (1%Al + 3%ZrO2)) reach to
13.95 Gpa, whereas the maximum values of impact strength reaches
to 7.8KJ/m 2 for (PMMA: 1% nF.D) Nano composite. And, the
results showed that the maximum values
of fracture toughness for Nano composite reach to 26.8 Mpa.m 1/2
for (PMMA: 3% nF.D) Nano composite. |
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