ABUTMENT INTERFACE

external

External connections, radiographically, appear as a protrusion at the shoulder of the implant. You might also notice that the internal threads begin more coronally.

internal

The internal connection is flat at the shoulder of the implant. you will see a thin wall surrounding the coronal portion of the implant. Threads often start more apically.

unique

While most implants have an external and internal hex, other systems have created some unique connections. Some examples are the spline (seen to the left) and the internal tri-lobe of nobel biocare.