To have a more beautiful smile, the use of ceramic veneers has become very popular. However, surface defects can affect the strength of ceramic veneers and lead to fracture and separation of the veneer from the tooth surface. This study examines the use of several different methods of surface restoration of ceramic core materials to increase the strength of the coating. Methods: In order to investigate different methods of surface treatment on the physical and mechanical properties of monolithic Ultra-translucent zirconia (ZrO2), 24 human maxillary premolar teeth were used for loading test. In this regard, the teeth prepared for veneers and after scanning 24 veneers from ultra-transparent zirconia (ZrO2) were made. A combination of 48% hydrofluoric acid solution and 69% nitric acid, Sandblasting and Nitric acid-hydrofluoric acid Zircos E etching system (ZSAT) were used to modify the surface of prepared ultra-translucent zirconia. The physical and mechanical characteristics of veneer were investigated in different experimental groups, including 48% HF and 69% HN combined group, Nitric acid-hydroflouric acid Zircos E etching system (ZSAT), and Sandblasted group as experimental groups. The results were analyzed using one-way ANOVA and Tukey's post-test. Results: The flexural strength of different samples of monolithic zirconia surface treatment showed that in mixture 48% HF and 69% HN group the loading resistance was 821.4±90.45 N. Regarding the monolithic zirconia surface modification with sandblasting method and ZSAT groups, loading resistance was 685.7±115.3 and 756.7±119.3 N. In each experimental group, veneer was de-deboned and fractured after applying these loading stress. The result of high fracture strength more than 930, 1320 and 1410 N, was tooth fractured vertically between buccal and central groove as like as veneer in mixture 48% HF and 69% HN, sandblasted and ZSAT groups, respectively. According to these results, sandblasted surface treatment increased flexural strength compared to other groups. Based on the results, none of the group show any significant difference and wad same resistance to flexural strength. Conclusion: mixture 48% HF and 69% HN, sandblasted and Zircos E etching system in monolithic zirconia surface treatment could increase its shear bond strength. These chemical agents could increase the strength of the coating, although clinical application should be further evaluated