What is the primary purpose of the external hex on a single-tooth root form implant?

The primary purpose of the external hex on a single-tooth root form implant is to prevent rotation. The external hex design contributes to the stability and retention of the implant by providing a precise connection point for the abutment. This design ensures that the abutment can be securely attached to the implant body, maintaining the intended position and orientation.

By preventing the rotation of the abutment relative to the implant, the external hex helps to ensure the longevity and functionality of the implant restoration. Additionally, it plays a role in improving the torque resistance of the connection, which is particularly important during the loading phase after the implant is placed.

While other features of implants can aid in aspects such as structural support, soft tissue attachment, and bone integration, the specific role of the external hex is primarily to create a connection that prevents rotational movement during the functional use of the implant.