الفهرس 
Sealing abilityOnly 14 pages are availabe for public view
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Abstract
The aim of the present study was to evaluate an experimental nano hydroxyapatite with and without silver nanoparticles as a root perforation repair material, with regards to:
Synthesis and characterization of the materials.
Physical properties including: setting time, dimensional changes & radiopacity.
Sealing ability
Biocompatibility and mineralization activity.
Anti bacterial activity
Nano hydroxyapatite and nano hydroxyapatite with silver nanoparticles were prepared and characterized using (XRD) & (TEM).
Setting time was evaluated using Gilmore needle, dimensional change was evaluated using a digital caliper and the radiopacity was evaluated using aluminium step wedge.
Sealing ability was evaluated using dye extraction method.
For the evaluation of biocompatibility and mineralization activity; twenty-one rats were divided into 3 groups of 7 rats each according to the observation period of rats (1 week, 30 days, 60 days). Microscopic evaluation was made through a light microscope at X200 magnification.
Evaluation of antibacterial effect: o Microorganisms: Enterococcus faecalis and Staphylococcus aureus. o Evaluation methods: a. Agar diffusion method. b. Direct contact test.