“…However, the conditions of the studies should be established since they can influence the results. Some studies used resin dies because their elasticity modulus is similar to dentin [ 37 , 41 ], while others used metallic dies, as in the present study [ 1 , 6 , 8 , 13 , 22 , 25 , 38 , 42 ], which provide for the standardization of the shape and dimensions of the specimens [ 6 , 42 ], and also avoid possible premature destruction when testing metallic alloys compared to natural or resin teeth [ 43 , 44 ]. In the study, real frameworks were used instead of bar-shaped, cylinder, or disc specimens [ 29 , 45 ], and the thickness was also standardized to simulate clinical conditions [ 37 , 44 , 46 , 47 , 48 ].…”