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Pilot Test for the Hardness and Shear Bond Strength Values for the Unfilled Resin Monomer Mixtures. Standard Deviations Are Shown in Parentheses. Knoop Hardness Values Were Obtained With a Duramin 5 Micro-Hardness Tester (Struers Corp, Westlake, Ohio) Using a Load of 200 p and a Time of 25 Seconds. Shear Bond Strength Was Evaluated Using Instron Universal Testing Machine (Instron Corp, Canton, Mass) at a Crosshead Speed of 0.5 mm/min
