Porcelain We work with the following porcelains for overlaying various types of substructures. Empress Overlay Nearly all Empress restorations employ overlay porcelain for final contours and esthetics. Willi Geller Creation Willi Geller Creation is the porcelain of choice for PFM restorations. Nobel Rondo Nobel Rondo is the porcelain of choice for zirconium substructures. 3D Dedicated 3D Dedicated porcelains are used when 3D shades are requested. Vita VM7 - Vita VM9 - Vita VMK 95 - for PFMs