الفهرس 
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Abstract
Evaluate the fracture resistance of endodontically treated teeth restored with CAM-CAM Post-core with crown and Endocrown restoration.Materials and Methods : A total of forty mandibular premolar teeth were divided into two main groups according to type of restoration. Each group was subdivided into two subgroups; according to materials. group PC: Twenty mandibular premolar teeth restored with customized CAD-CAM Post-core. The group further subdivided into two subgroups: Subgroup PCP : CAD-CAM Post-Core with crown fabricated from PEEK (n=10). Subgroup PCVE : CAD-CAM Post-Core with crown fabricated from Vita Enamic (n=10). group EN: Twenty mandibular premolar teeth restored with customized Endocrown. The group further subdivided into two subgroups: Subgroup ENP: Endocrown fabricated from PEEK (n=10). Subgroup ENVE: Endocrown fabricated from Vita Enamic (n=10). All groups were cemented with dual cure Rely X U200 self-adhesive resin cement. The specimens were Thermocycled (7000cycle, at 55oC). Then mounted in the Universal Testing Machine. Each specimen was loaded to failure at a crosshead speed 1mm/min. Mode of failure was also examined. Data were analyzed using one way analysis of variance (ANOVA) and Tukey’s post hoc significance difference tests. Differences were considered significant at P<0.05. Results : According to Post-core design. There was a statistical significant difference between Vita Enamic and PEEK with higher mean value among PEEK than Vita Enamic (1863.24 & 1031.0,Mpa respectively). While with Endocrown design there was a statistical significant difference between Vita Enamic and PEEK with higher mean value among PEEK than Vita Enamic (1566.87 & 817.23, Mpa respectively). Conclusions : Under the conditions of this study, fracture resistance load obtained in different test groups restored by PEEK (Post-core and Endocrown) demonstrated significant greater fracture resistance than Vita Enamic Post-core with and Endocrown.