Our Mission Is Simple: Success with Zirkonzahn's PrettauĀ® Implant Bridge! The ONLY proven and time/tested world-wide company for full arch zirconia! And our only product. Tischler Dental Laboratory's focus is on creating the PrettauĀ® Zirconia Implant Bridge from Zirkonzahn. We are the leading PrettauĀ® Bridge Dental Laboratory in the USA!