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.
Computerized milled solid implant abutments utilized at second stage surgery
Background: Rotational forces at single crowns are a great challenge in terms of the tightening of the abutment head against the implant platform. Lateral forces (i.e. all forces not axially) also challenge the restoration especially in the upper anterior situations, where the implant often is placed in a protruded angle. Material components fatigue and loosening may occur.
Currently three types of abutments exists: stock, UCLA and computermilled abutments. The prefabricated stock abutments may be milled at the office or at the laboratory and are available as straight or in preset angles. These abutments do not allow for major adjustments, because the angles are fixed and the width cannot be enlarged. The second type of abutment is the UCLA type which is a laboratory wax and cast gold alloy abutment. The precision fit of the all plastic abutment to an implant can never be as high as for milled abutments. However, there are milled UCLA abutments with a wax and castable sleeve but these can have limited mechanical properties. Computermilled abutments can achieve ideal strengths without the compromise of the abutment head. Furthermore, the precision of marginal fit is increased with milled abutments compared to cast abutments.
The Atlantis abutment concept works from a master cast of the patient (impression and index), retrieving additional information from predetermined land marks. At the laboratory, implant analogs are incorporated in the master cast and the computer assisted design of the ideal abutment takes place. The final design file is transferred to a computer controlled precision milling machine for the manufacturing of the whole solid titanium abutment. The abutment can be produced in exact duplicates with or without a temporary construction. If no adjustments are required at try-in, the final construction can be manufactured without an additional impression.
Case report: A sport related trauma in the upper canine position served as indication for a 2-stage implant therapy. At second stage surgery a healing abutment was placed and the area was left to heal for 7 days. Impressions were then taken of the full arch with a transfer coping seated on the implant.
The impression tray (holding the transfer coping) was sent to Atlantis for duplicate abutment fabrication. At delivery, both abutments were tried-in, with extra emphasis of the marginal contour. One abutment was used to support the temporary crown and the other was returned to the lab for the production of a porcelain-fused-to-metal crown. At try-in of the final crown, X-ray confirmed seating, and finally the crown was cemented.
Conclusion: The Atlantis abutment offers ideal abutment shape and profile, simplifying the prosthetic portion of the treatment and improving the esthetic result. The head on the Atlantis abutment is stronger than on the cast UCLA abutment which can be of importance as more forces are brought to the platform area. The solid standard titanium abutments have a long-term success documented over 30 years. Hence, the Atlantis abutment which is also milled from a solid titanium block is therefore expected to have similar good long-term results.
Astra Tech
BioManagement Complex 
