Atlantis'" is the patient-specific abutment for all major implant systems. The abutments are designed from the final tooth shape using unique software, enabling the production of milled titanium and zirconia abutments.
Utilizing computer-generated duplicate titanium custom abutments to facilitate intraoral and laboratory implant prosthesis fabrication
Background: Patient specific or custom made abutments assisted by computer design and computer manufacturing (CAD/CAM) can predictably be formed with the desired marginal contour, orientation and morphology. The Atlantis concept further allows for the correct anatomical gingival formation at the prosthetic margin (first set of abutment) and for the simultaneous prosthesis fabrication using an exact duplicate abutment (second set of abutment).
This article describes the methodology of CAD/ CAM fabrication of implant prosthesis utilizing abutment duplicates. The technique offers significant advantages compared to he conventional single abutment technique.
Concept: The CAD/CAM abutments are machine milled out of a solid titanium block. The Atlantis concept includes the production of a second "virtual abutment" obtained from the same data file from the master stone cast. This virtual abutment can be produced repeatedly with the exact dimensions. The first abutment is connected to the implant at second stage surgery and used as a healing abutment, while the second works as a laboratory master die. Enhanced laboratory accuracy is obtained when material distortions in impression materials and stone dies are avoided. Furthermore, the marginal accuracy of the abutment fit to the implant is improved since the abutment is milled and not a result of a cast.
In a clinical example a full upper arch rehabilitation is indicated due to lost function and esthetics.
The provisional dentures were scanned in order to resemble the anatomical form and geometry of the final restoration. Thereafter the master stone cast with the implant analogs was scanned. The CAD program then compared the two scans in order to optimize the design of the abutments and a final milling of a titanium block was performed. One set of abutments to fabricate the provisional restorations (which was the original full denture) and to control the tissue shape. The other set of abutments functioned as laboratory dies for metal framework fabrication and ceramic application.
Conclusion: The current "state-of-the art" in custommade abutments utilizes CAD/CAM technology to design and mill abutments. Since the information is stored in computer files duplicates can be produced. In this case, a set of abutments is used intraorally for the soft tissue and also to support the temporary construction, while the other set is used to fabricate the final restoration. Significant advantages over the conventional single abutment technique are offered.
Astra Tech
BioManagement Complex 
