Comparison of the Amount of Marginal Fit and Shear Strength Tolerance Between the Prefabricated Abutments and the Abutments Manufactured Using the CAD CAM Method of Zirconia and the Abutments Manufactured by the Waxing Method of the Chroum-Cobalt Mixture . Tuj-hlth 2023, 45 (1), 93-103.