الفهرس 
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Abstract
This invitro study was carried out to asses the antimicrobial effect and shear bond strength of silver nanoparticles modified composite resin cement.
Silver nanoparticles and composite resin cement were used as tested materials. A split tephlon mold was used for preparing samples used in bacterial adhesion test. A custom made mold was used for preparing the porcelain samples for shear bond strength test.
A total of 40 samples were constructed and classified into two groups (20 samples for each).
group I (control group) samples without any modification.
group II (silver nanoparticles modified resin samples).
Each group was tested for antimicrobial activities(15 samples for each), Samples were tested against three types of the microorganisms, (Escherichia coli (gram –ve bacteria ), staphylococcus aureus (gram +ve bacteria) and candida albicans (yeast))5 samples for each, and shear bond strength test(5 samples for each).Colonies forming unit (CFU) count was used to test the antibacterial and antifungal effect of silver nanoparticles. Results were tabulated and statistically analyzed.
The results showed that the silver nanoparticles modified composite resin cement samples (GroupII) exhibited antimicrobial effect toward gram-negative (E. coli), gram-positive (S. aureus) as well as to the yeast (C. albicans). Moreover the antibacterial effect was more pronounced on E-coli than staphylococcus aureus.
The shear bond strength results showed that silver nanoparticles modified resin cement samples (group II) demonstrated non-significant decrease than the control group.
Conclusions:
Under the limitations of the current study the following conclusions could be drived:
1- The addition of silver nanoparticles to composite resin cement was proved to be a very effective method in inhibition of bacterial growth via inhibition of colonies forming unit(CFU) count.
2- The antimicrobial effect of the tested materials were more pronounced on gram –ve than gram +ve bacteria.
3- Addition of silver nanoparticles to composite resin cement not affect on the shear bond strength significantly.
4-Results showed promise use of silver nanoparticles as effective method against microbial colonization, preventing the chances of recurrent caries without significant effect on its bonding ability.
Recommendations:
1-Further investigations assessing the antimicrobial activity of different concentrations of silver nano particles incorporating into composite resin cement.
2-Further investigations required to assess other mechanical properties and color change of silver nano particles incorporating composite resin cement.