Dissertation was published by the Materials Engineering Department at the University of Technology, namely lect. Dr. Sera Salem Ahmed ,lect. assist. Hiba Abdul Rahim and.lect. Heba Anwar Abdullah, Joint Scientific Research on Mechanical Properties of Composite Materials Reinforced in Ceramic Minutes in Journal of Mechanical and Production Engineering, vol. 5, p. 29-25 of 2017.
 The study examined the preparation of the overlapping materials of the polycrystalline methacrylate resin by the manual pliers. The mechanical properties of hardness, tensile properties (maximum tensile strength, elongation at fracture), shock (shock resistance and fracture strength) and shear stress were examined.
 As for the mechanical properties, the overlapping material of Acrylic + 7% ZrO2 has the maximum hardness of Shore D (72.4). The maximum strength we obtained from (Acrylic + 7% ZrO2) is 33.75MPa, while the elongation at fracture decreases with the increase in the concentration of fillings And the lowest value we got
 (Acrylic + 7% ZrO2) compared to other overlays.
 The shock resistance was higher than
 (83J / m2) (Acrylic + 3% ZrO2) compared with other composites. The fracture reliability of the layers increased with increasing Zirconia minutes and the highest value was 2.998MPa.m-1 / increased bending resistance and shear stress for overlapping materials with increasing oxide minutes Zirconia at 7wt% (81) Mpa and (1.8) Mpa.