12. There are three different crystal structures of zirconium oxide: monoclinic at room temperature, tetragonal at ~120

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12 There Are Three Different Crystal Structures Of Zirconium Oxide Monoclinic At Room Temperature Tetragonal At 120 1 (44.37 KiB) Viewed 12 times

12. There are three different crystal structures of zirconium oxide: monoclinic at room temperature, tetragonal at ~120 C, and cubic at 2370 C. These phases can transform into each other. What is the specific name of this transformation? a. Phase transformation b. Phase rehabilitation c. Phase unity d. Phase separation e. Phase fusion. 13. Which of the following is not a characteristic of zirconia? a. Low thermal conductivity b. To be opaque c. High fracture resistance d. Chemically inert and corrosion resistant e. Being fluid What is the intermolecular resistance that occurs inside an object against an external force applied to that object? a. Stress b. Force 14. c. Streght d. Hardness e. Elastic deformation 15. Which is false about dental waxes? a. They do not have a specific melting point, they have melting ranges. b. Among the materials need in dentistry, waxes have the highest thermal expansion. c. Since the softening degree and resistance of waxes are higher than other materials used in dentistry that they easily affected by temperature changes. d. The fluidity of the waxes depends on, the temperature of the waxes, the intensity of the applied force, the time, the force is applied. e. As the residual stress ratio develops, the tendency of the wax to revert to its former state causes distortion in the wax model.