الفهرس 
Introduction
Acrylic resin matrixOnly 14 pages are availabe for public view
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Abstract
?Addition of 5% of PE fibers with coupling agent exhibited the highest mean value of impact resistance for both self and heatcured acrylic resin. There was no significant difference between all groups with coupling agents and without coupling agent. ?Hybrid composites provided better improvement of impact resistance than using reinforcing material alone as in case of Gr.GF+PE and ZrO+Gr.GF, these values were higher than using Gr.GF and ZrO alone. ?The highest mean value of transverse strength for selfcured acrylic resin was for PE group at 3% when used without silane coupling agent while for heatcured acrylic resin, the highest mean value was for Gr.GF at 7.5% when used with silane coupling agent. ?Addition of Gr.GF with silane coupling agent to PE and ZrO resulted in increasing the mean values of transverse strength and producing hybrid materials with properties better than using PE or ZrO alone. ?For selfcured acrylic resin, the highest mean value of tensile strength was at 15% of Gr.GF with silane coupling agent, while for heatcured acrylic resin, the highest mean value of tensile strength was for PE group without coupling agent at 1.5%. ?Addition of Gr.GF with silane coupling agent to PE and ZrO; improved mean values of tensile strength for both self and heatcured acrylic resins. These results were higher than using PE or ZrO alone. ?15% of ZrO with zirconate coupling agent provided the highest mean value of hardness for selfcured acrylic resin while 15% of ZrO without zirconate coupling agent exhibited the highest mean value of hardness for heatcured acrylic resin. ?Silane coupling agent did not improve adhesion of PE fibers to both self and heat cured acrylic resins, the values of transverse strengths, tensile strengths and hardness were less with coupling agent than without coupling agent. ?Addition of zirconate coupling agent to heatcured acrylic resin decreased mean values of transverse strength, tensile strength and hardness. This may be due to the effect of heat during polymerization and curing of acrylic resin. ?A highly radiopaque composite was obtained by adding ZrO powder to acrylic resins.