الفهرس 
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Abstract
An in-vitro study evaluating the effect of different preparation marginal designs and depths on fracture strength of Vita Enamic endocrown restorations. Forty endodontically treated upper premolars were prepared to be restored with endocrown restorations. They were divided into two main groups according to the preparation marginal design into butt joint and shoulder finish line. The two main groups were subdivided into two subgroups according to the extension depth of pulp cavity into (2&4mm). All specimens were thermal aged. The fracture resistance test was done and all possible failure modes were detected. There was a statistically significant difference between the two different marginal design and no significant difference between the preparation depths within the same marginal design. The fracture mode analysis showed no significant difference among tested groups. Conclusion : The fracture strength of teeth restored with Vita Enamic endocrown restorations can increased by shoulder finish line marginal design.