Introduction: Compressive and tensile stresses of core materials are important properties because cores usually replace a large bulk of tooth structure and must resist multidirectional masticatory forces for many years. Material and Methods: The present study was undertaken to find out the best core build up material with respect to their physical properties among resin-based composites. Individual compressive, tensile, and flexural strength of fiber-reinforced dual cure resin core build up material, silorane-based composite resin, and dual curing composite for core build up with silver amalgam core was used as control were evaluated and compared using universal testing machine. Data were statistical analysed using Kruskal-Wallis test to determine whether statistically significant differences (P < 0.05) existed among core materials. Both dual cure composite materials with nanofillers were found superior to amalgam core. The silorane-based material showed the highest flexural strength, but other mechanical properties were inferior to dual cure composite materials with nanofillers.
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