الفهرس 
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Abstract
Recently extracted maxillary incisors were selected on the
basis of lack of any carious lesions, microfractures, or abrasion
cavities. They were stored in saline solution until used for
experimentation. The selected teeth were randomly assigned into 5
experimental subgroups
group 1: Teeth restored with readymade FRC Postec plus
posts and direct composite cores.
group 2: Teeth restored readymade FRC Postec plus with
Targis cores
group 3: Teeth restored with Vectris FRC posts and ceromer
Targis cores.
group 4: Teeth restored with Vectris FRC posts and direct
composite cores.
group 5: Teeth restored with casted posts and cores.
The teeth were decoronated two ways:
1) at a level 2 mm coronal to the cementoenamel junction (CEJ)
(Maillefer) in a high speed hand .A shoulder, 1 mm in depth
and 2 mm in height, was created at this level around the full
circumference of the tooth creating a 2 mm ferruled collar .
2) At a level of the cementoenamel junction (CEJ).
The teeth then subjected to conventional endodontic treatment and
then mounted vertically in resin blocks to a depth of 2 mm apical
to CEJ. Post preparations for the root canals were done using
different post drills Posts were then constructed each according to
its group, using innovative techniques, and were cemented into the
respective teeth. The Samples were all subjected to fracture resistance testing and
the results were assessed for statistical analysis. Furthermore, the
mode of failure of the post-core-root complex was observed and
recorded and the different fracture patterns were statistically
analyzed.