Samy El-Safty

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OBJECTIVES To determine the creep deformation of several "bulk-fill" resin-composite formulations in comparison with some other types. METHODS Six resin-composites; four bulk-fill and two conventional were investigated. Stainless steel split molds (4 mm × 6 mm) were used to prepare cylindrical specimens for creep testing. Specimens were thoroughly(More)
OBJECTIVES To determine the effect of temperature, over a clinically relevant range, on the creep behaviour of a set of conventional and flowable resin-composites including two subgroups having the same resin matrix and varied filler loading. METHODS Eight dental resin-composites: four flowable and four conventional were investigated. Stainless steel(More)
OBJECTIVE To determine by nanoindentation the hardness and elastic modulus of resin-composites, including a series with systematically varied filler loading, plus other representative materials that fall into the categories of flowable, bulk-fill and conventional nano-hybrid types. METHODS Ten dental resin-composites: three flowable, three bulk-fill and(More)
OBJECTIVES To evaluate nanoindentation as an experimental tool for characterizing the viscoelastic time-dependent creep of resin-composites and to compare the resulting parameters with those obtained by bulk compressive creep. METHODS Ten dental resin-composites: five conventional, three bulk-fill and two flowable were investigated using both(More)
OBJECTIVE To explore experimental RBCs derived from a successful commercially available RBC (Grandio) to investigate resin monomer blend and filler parameters (volume fraction, density and diameter) on RBC performance. METHOD Six experimental RBCs modified from a commercial RBC were tested. The three-point flexure strength (σ(3)) and modulus (E) data was(More)
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