الفهرس 
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Abstract
The aim of this study comprises three main fold:
1- Investigating the fracture resistance of teeth obturated with Guttacore as compared with Thermafil root canal obturator.
2- Asses the sealing ability of root canals obturated with a novel carrier based root canal obturator: Guttacore as compared with Thermafil root canal obturator.
3- Examining the Guttacore material to verify its cross-linked structure.