Porcelain fused to metal crown has been used mostly over the last 50 years for restorations in dentistry. However, the
patients’ awareness of aesthetic aspect, biocompatibility and the problems such as an allergy to metals led to the growing
interest in the ‘metal free restoration’. In particular, the price of the precious metals that have been mainly used to date
has risen drastically, which made them impossible to play their role as oral restorative materials anymore, and in addition,
the PFM restoration has intrinsic problems of chipping and fracture. Therefore, the CAD/CAM has been drawing more
attention than ever due to the popular needs for the material that is more aesthetic and stronger for restoration of the molar
implant. Considerations in carrying out the full zirconia restoration are as follows: 1) strength, 2) combination work, 3)
light penetrability, 4) treatment of cracks, 5) the color reproducibility of the block, 6) the abrasivity of antagonistic tooth,
7) low temperature degradation. In this presentation, the color reproducibility of the block will be discussed. One of the
biggest reasons for avoiding the full zirconia restoration is that it is difficult to reproduce the natural color compared to
the conventional PFM restoration. Thus, many clinicians show reluctance due to the exposure of the ugly block when the
coloring on the surface is removed after occlusal adjustment. From the experience of using blocks by Zirkonzahn for more
than 4 years, it is considered that these problems can be addressed to some degrees. Accordingly, how to make restorations that are well in harmony with surrounding prosthesis or natural teeth will be discussed
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