الفهرس 
Veneering SystemsOnly 14 pages are availabe for public view
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Abstract
this is in vitro study was conducted to evaluate the fracture resistance ofBio-HPP frame work veneered by different materials for fixed partial prostheses.Materials and Methods: twenty – four 3 unites bridge with PEEK substructurewere on standardized PMMA abutments for premolars and molars and divided intothree groups according to veneering materials. group I: PEEK Frame work veneered with vasoline composite. group II: PEEK Frame work veneered with E-max CADLithium Disilicate glass. group III: PEEK Frame work veneered with Hybridceramics. BIO-HPP/PEEK substructure veneered with vasoline composite, E-max CAD, and Vita Enamic groups (n=8). were stored in distilled water for 24 hours at 37℃, then subjected to thermocycling for 10,000 cycles (5-55ºC) with a 30-s dwelltime, 20 seconds transfer time, then subjected to thermo-dynamic stressing with maximum vertical load of 5 kg with cyclic frequency of 1.7 Hz for 150,000 cycles. Samples were mounted to a universal testing machine (Instron 3365) bridges fracture resistance were tested by applying a load through a 4.2 mm diameter steel ball at a crosshead speed of 1 mm/min occlusally in the central fossa area.