https://www.dentallabgs.com/products/pfm-implant-crown-co-cr-screw-retained/ Screw retained PFM implant crown Implant PFM Crown -Co-Cr (Screw Retained) PFM Non Precious Screw Retained Crown is wonderful solution for doctors who prefer screw retained restorations, and are looking for the most economical way to restore an implant. Screw retained PFM implant crowns can be made from a all plastic UCLA abutment, or can be cemented to a Ti-Base, at the doctor's preference.