Wednesday, August 15th 2018 8:45AM EDT

Integrated Abutment Crown™ (IAC): Laboratory Technique

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Shape Bicon Abutment

1. Use minimal soft tissue material and maximum stone around the implant analog.

2. Choose an appropriate non-shouldered or shouldered abutment that will allow for a minimum of 2.0mm and a maximum of 5.0mm thickness of polyceramic material.

3. Confirm size appropriateness of abutment on soft tissue model.

4. Mark height of gingival contour on the abutment with a red felt tip marker.

5. Insert the abutment into the abutment preparation holder and mark a subgingival line around the abutment. The subgingival line should be 2.0 to 4.0mm below the red gingival contour line.

6. Make gross preparations to the abutment with a cutting disc.

7. Make final preparation with a carbide bur.

8. Examples of partially prepared and finished abutments.

9. Prepared abutments on model.

10. Use 6.0mm tall stealth shouldered abutment when implant is 2.0 to 4.0mm sub-crestal and the 8.0mm tall stealth shouldered abutment when the implant is 4.0mm or more below the crest of bone.

 

Keys to Success

  • Seat impression post into implant analog prior to its insertion into impression. Confirm stability of both insertions.
  • Use of metal implant analogs requires that their locking taper be engaged while working with IAC on the model to assure accurate axial positioning.
  • Use minimal soft tissue material and maximum stone around the implant analog.
  • Bisect soft tissue on model to facilitate placement and removal of the abutment.
  • Place facial margin at least 3.0mm subgingivally.
  • Select the widest abutment possible for an ideal emergence profile.
  • Remove all sharp line angles from abutment with an E cross cut Brasseler Bur and/or Great White Burs by SS White.
  • Avoid making restorations with ridge laps.

 

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