A scientific study at the University of Washington proved that using the Z4, users can drill screw-access channels for hybrid implant restorations into ceramic blocks with no signif-icant difference in flexural strength compared to factory-fabricated materials, known as “meso” blocks.
These blocks are significantly more expensive, and the laboratory design method requires a more sophisticated CAD process. Thus, processing standard blocks with the Z4 means less cost for material and less material inventory necessary.
Jack M. Keesler, DDS, MSD. Effect of milling screw-access channels on flexural strength of CAD/CAM ceramic materials. MSD Master’s Thesis, University of Washington, 2019.