الفهرس 
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Abstract
This study was designed to determine the effect of fiber reinforcement on the fracture strength and toughness of long span provisional restorations.
Materials and method: Two types of commercially available provisional materials were selected: Protemp™ II and Protemp™ 4. A number of twenty samples were made for each material. The samples of each group were further subdivided into two equal subgroups (A and B); where subgroup A served as control, without fiber reinforcement while subgroup B included the addition of ultrahigh modulus polyethylene fibers (UHMPE) which is delivered pre impregnated by the manufacturer. The fibers were pre weighed using an electronic scale, and cut to a predetermined length (2-3mm) before incorporation in the resin mix to represent 3% weight of the control sample. Two sample designs were selected according to the requirements of testing: Twenty 4 unit fixed partial dentures for fracture strength test (D 1), and twenty rectangular specimens for fracture toughness test (D 2). The specimens were left in saline for 7 days before testing.