INTRODUCTION: Monolithic zirconia has increasingly been used in dentistry over recent years, taking advantage of its high strength. The strength is due to the crystalline phase transformation system of zirconia (i.e. stressinduced transformation toughening), giving the material high mechanical strength and reliability. In addition, the development of computer aided designing (CAD)/computer aided manufacturing (CAM) technology has also increased its use. Thus, all-ceramic crowns and fixed dental prostheses (FDPs) utilizing zirconia as a framework have been provided to patients with sufficient strength and a good esthetic outcome. [1] Due to the original color of zirconia (i.e. bright white), its application has been limited. The development of translucent tooth-colored zirconia, however, enables fabrication of restorations without veneering porcelain (i.e. monolithic zirconia crown). [2] Advantages of monolithic zirconia crowns may be limited amounts of defects due to fabrication with CAD/CAM technique and reduced production time/ cost. [3] When a tooth is restored with a conventional all ceramic crown, irrespective of the materials used, it is recommended that axial and occlusal reduction of the preparation should be 1.5 and 2.0 mm, respectively. [4] The soft-tissue response to MZ crowns has been very encouraging. They promote a soft-tissue response very similar to porcelain veneers; the tissue stays pink and stippled and healthy The high biocompatibility of zirconia is evidenced by the success rate when using zirconia medical implants for procedures such as hip replacement. Advantageous clinical properties—such as reduced bacterial adhesion, ease of manipulation, high strength, and polishability, along with superior resistance to fracture—combine to make MZ crowns the ideal choice for posterior full-coverage restorations [5]. Highly polished ovate pontics are easily cleaned and maintained, and the resistance MZ restorations show to bacterial adhesion encourages a healthy response from surrounding soft tissues. The ease of shaping and polishing MZ restorations provides a nature-mimicking environment that contributes to the health of soft tissues surrounding these crowns and bridges . Because the MZ crowns are tooth-colored, finish lines may be either supragingival or subgingival. Very often the length of the clinical crown determines the position of the finish line. A short clinical crown may require a subgingival finish line in order to have a significant ferrule for retention of the MZ restoration.The reason is to obtain sufficient strength for the reconstruction and space for veneering. [6] Since there are no studies to evaluate the awareness about the usage of monolithic zirconia crowns, no sound conclusions can be made. The purpose of this paper was to test the knowledge concerning the wear, translucency, as well as clinical performance of monolithic zirconia ceramics, aiming at highlighting their advantages and weaknesses through data presented in recent literature. Our team has extensive knowledge and research experience that has translate into high quality publications

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