Investigation
of Hardness and Flexural Proerties of PMMA Nano Composites and
PMMA Hybrids Nano Composites Reinforced by Different Nano
Particles materials 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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