Abutment for Fixed Restorations

There are three main abutment types for the fabrication of fixed restorations:
Abutments for cement retained restorations – are long, straight or angulated abutments, with or without a chamfer. Fixed restorations are cemented onto these abutments like standard crowns or bridges.
TMA abutments for screw retained restorations – are short, conical shaped abutments. Fixed restorations that are held by screws adhering to TMA abutments.
Abutments for direct screw retained restorations – are long sleeves with or without a pre-fabricated
metal implant connection, that are casted in the laboratory to fabricate restorations that are held by screws adhering directly to implants.
Note: Provisional abutments are available for screw retained restoration types. They share the main characteristics of the corresponding final abutments.

Basic Abutment Type Comparison Table:

  Cement retained abutments TMA abutments Direct, screw retained abutments
Description Long, straight or angulated abutments, with or without a chamfer Short, conical, straight or angulated abutments Long, straight abutments, with or without a pre-fabricated metal implant connection
Angulated abutment options *15°, 25°, 35° *17°, 30°, 45° None
Available gingival heights

1-4mm

1-5mm
(Straight TMAs only)

N/A

Main benefits Most similar to standard crown and bridge procedures
Can be modified chairside or in the dental laboratory
Retrievable Low vertical height
Concerns Abutment restorative portion should not be shorter than 4 mm Access holes through occlusal surfaces Access holes through occlusal surfaces
May overload implant connection

*Not available in all platforms

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