Sitemap About Atlantis. The best of two worlds – Atlantis™ and Astra Tech Implant System™. When it comes to cement-retained restorations and patient-specific abutments, the combination of Atlantis™ and Astra Tech Implant System™ is unbeatable. You will have the benefits of Astra Tech BioManagement Complex™ along with the esthetics and fit of Atlantis™ patient-specific abutments.