Zirconia restorations have been used successfully for years in dentistry owing to their biocompatibility and good mechanical properties. Factors affecting the mechanical properties of zirconia ceramics are; microstructure, the size of microcracks, porosity, stabilizer additives and pigments, factory processing and sintering process.Because of their lack of translucency, zirconia cores are generally veneered with porcelain, which makes restorations weaker due to failure of the adhesion between the two materials. In recent years, all-ceramic zirconia restorations have been introduced in the dental sector with the intent to solve this problem. New monolithic zirconia material combines the known positive properties of zirconia with a significant increase in translucency (49% translucency), making it ideal for anterior and posterior applications.Due to its high strength, all-zirconia monolithic restorations are suited for cases with only limited inter-occlusal space, allowing minimal restoration wall-thickness in the posterior and anterior region. MZ crowns can be prepared just like conventional PFM crowns using either a butt shoulder, a chamfer, or a knife-edge finish line.Perhaps the greatest advantage of MZ crowns is the fact that they require less time to fabricate using CAD-CAM (computer-aided design and computer-aided manufacturing) technology and are, therefore, less costly than conventional PFM restorations.Monolithic zirconia restorations can be seated using an adhesive, self adhesive or conventional cementation luting protocol. Polishing of the surface, particularly in the occlusal areas, is a must. Failure to adhere to these guidelines may lead to damage to the opposing teeth.