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Effect of
Water Absorption on the Compressive Strength for PMMA Nano
Composites and PMMA Hybrids Nano Composites Reinforced by
Different Nanoparticles Used in Dental Applications |
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Poly
methyl methacrylate (PMMA), are widely used as a prosthodontic
denture base, the denture base materials should exhibit good
mechanical properties and dimensional stability in moist
environment. In thebpresent research,
efforts were made to develop the properties of PMMA resin that
used for upper and lower prosthesis complete denture, by
addition four different types of nanoparticles, which are fly
ash, flybdust, 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.bIn
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 groupsbconsists 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% fly ash)+ (1%bl
+ 3% ZrO2)), ((PMMA:X% fly dust)+ (1%Al + 3% ZrO2)) and
((PMMA:X%nZrO2)+(1%fly ash+3%fly dust)) respectively. As well
as, the effect of water absorption was taking into consideration
in this study. Thebcompression test
results show that the values of the compressive strength with
and without the effect of water absorption increased with the
addition of Nano powders (fly ash, fly dust, zirconia, and
aluminum).bAlso, the results showed
that the maximum values of compressive strength reach to
286.25MPa for (PMMA: 2%nZrO2) Nano composite. Whereas the
maximum values of compressive strength for hybrid Nanobcomposite
reach to 270MPa for ((PMMA: 2%fly ash) + (1%Al + 3% ZrO2))
hybrid Nano composite. Moreover, the results showed that the
maximum value of compressive strength under the effect of waterbabsorption
reach to 335MPa in the Nano composite material (PMMA+2% fly
dust), whereas the maximum value of compressive strength under
the effect of water absorption for hybrid Nano composite reach
to 632MPa for ((PMMA: 2% fly dust) +
(1%Al + 3% ZrO2)) hybrid Nano composite |
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