Zirconia Full-Arch, Screw-Retained Bridges: a Multi-Year Perspective – Avoiding Surgical and Prosthetic Complications presented on ICOI Main Podium by Dr. Michael Tischler Dr. Michael Tischler presented the results of a 5-year study of Prettau Zirconia full arch bridges and the Teeth Tomorrow dental implant protocol on the main podium of the 2017 International Congress of Oral Implantologists Winter Symposium, on Friday, February 17th. Dr. Tischler’s presentation – Zirconia Full-Arch, Screw-Retained Bridges: a Multi-Year Perspective – detailed the impressive success rates for 153 patients receiving a total of 219 Prettau Zirconia Arches between 2012 and 2017.