الفهرس 
Fracture resistance under cyclic loading of lithium disilicate vonlays versus rosetta vonlays restoring premolars
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Abstract
Aim: The aim of thiscurrent study was to compare the fracture resistance under cyclic loading of lithium disilicate (IPS e.max CAD) vonlays versus (Rosetta®SM CAD)vonlays restoring premolars. Methodology: A natural maxillary premolar tooth was prepared according to regular dimensions of all ceramic restorations preparation guidelines, the prepared naturalpremolar tooth was then duplicated into twenty epoxy resin dies, each die was scanned by Medit i500 scanner extra oral scanner and then milled by Sirona MCX5 milling machine usingIPS e.max CAD blocks and Rosetta®SM CADblocks. A total sample size of 20 will be selected then divided into two equal groups 10 sample each according to the material type used, group (A)ten vonlay samples (n=10) fabricated ofIPS e.max CAD blocks, group (B) ten vonlays samples (n=10) fabricated of Rosetta®SM CAD /CAM blocks. Load to fracture was tested. Result: IPS e.max CAD group recorded statistically non-significant higher fracture resistance mean value (502.39 ±102.89 N) than Rosettagroup (468.76 ± 67.54 N) as described by unpaired t-test (P=0.5006 > 0.05