Geller became an advisor to VITA Willi Geller was at the time preparing VITA's porcelain and making opus dentine. . Today, opus dentine is an indispensable ceramic material that has been introduced into the kits of all manufacturers.

The upper section of the colour table is the 'VMK Opak - Dentin' colour table, while the lower section is the 'VMK Schultermasse' colour table.

The powder in the lower section was also the first margin porcelain in the world to be manufactured, and it was the brainchild of our oral design member Peter Vryonis, who was behind the VITA technology of the time.