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In the
present search, attempts are made to develop the properties of
PMMA resin that used for prosthetic complete denture base
material, 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), as cold cured
resin. Also woven glass fiber kind (Eglass) 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- p)
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-HA) 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-
rO2) and Kevlar fiber layer. The experimental part of this work
included performing tensile test. In addition, morphology test
was done by (SEM). The result of this experimental research
shows that the values of tensile strength and modulus of
elasticity increased with increasing the volume fraction of (nHA
and ZrO2) particles for all groups specimens, and all values of
elongation decreased with increasing volume fraction of (nHA and
ZrO2) particles. And the composite prosthetic dentures
(PMMA-ZrO2) show greater values for tensile strength and modulus
of elasticity properties. While, the reinforcement by nHA
particles had shown greater values for elongation for all
groups’ specimens. Also the results shown the maximum values for
hybrid laminated composite materials for tensile strength and
modulus of elasticity properties is obtained in hybrid laminated
composite materials for sixth groups’ specimens. While the
maximum value for elongation is obtained for first groups’
specimens. |
