الفهرس 
Introduction
Aim of the studyOnly 14 pages are availabe for public view
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Abstract
Endodonticaly treated teeth are widely considered to be more susceptible to fracture than vital teeth .The reasons most common often reported have been the dehydration of dentin after endodontic therapy, excessive pressure during obturation and removal of tooth structure during endodontic treatment. The use of composite resin in the root canal as a way of strengthening the remaining dental structure can be available solution. However, bonding agents and resin studied as root filling materials had problem in working properties, radiopacity and lack of retreat ability when used for endodontic purpose. Recently, a new thermoplastic, filled polymer (Resilon) has been introduced that has the potential to challenge guttapercha as a root filling material and may be effective in creating a mechanical bond to the canal wall by creating monoblock. The Lloyd testing machine is used to measure the fracture resistance. The higher fracture resistance is found in roots obturated with Epiphany system and those obturated with guttapercha and glassionomer based sealer independent of the type of preparation used. The Finite Element Method (FEM) was selected to perform the stress analysis of the tooth. The study has shown that the minimum stresses have to be found in dentin when Epiphany material used.