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In the
present search, attempts are made to develop the properties of
PMMA resin that used for upper and lower prosthesis complete
denture, by addition two different types of particles, which
included: nano- ydroxyapatite (nHA) particles and micro-zirconia
(ZrO2) particles that added with different volume fractions of
(1%, 2% and 3%) to poly methyl methacrylate (PMMA) cold cured
resin as new fluid resin matrix. Also woven glass fiber kind
(E-glass) and woven Kevlar fiber kind (49), it were added with a
fixed volume fraction of (5%) to PMMA composites. In this work
the composite prosthetic dentures specimens preparation was done
by using (Hand Lay-Up) method as six groups which includes: the
first group consists of PMMA resin reinforced by nHA particles,
the second group consists of PMMA resin reinforced by ZrO2
particles, the third group consists of (PMMA-nHA) and glass
fiber layer as laminated composite , the fourth group consists
of (PMMA-ZrO2) and glass fiber layer, the fifth group consists
of (PMMA-nHA) and Kevlar fiber layer and the sixth group
consists of (PMMA-ZrO2) and Kevlar fiber layer. The experimental
part of this study included performing many mechanical tests
which, includes (Flexural, Maximum Shear Stress and Impact)
tests. The result of this study showed the values of most
properties increased with increasing of the volume fraction of (nHA
and ZrO2) particles in polymer composite materials. While, the
impact strength decreased. The ZrO2 particle and woven mat
Kevlar fiber had shown greater values for the most composite
materials properties for all groups’ specimens except the
flexural strain. Also the results showed the maximum values for
hybrid aminated composite properties (flexural modulus and
impact strength) were obtained in hybrid laminated composite
materials for sixth group specimens. While, the maximum value
for properties (flexural strength and max shear stress) were
obtained in hybrid laminated composite materials for fourth
group specimens. |
