How to Find Abutment Screw Channel of a Cement-retained Implant Supported Restoration? A Literature Reviews

Screw loosening is the most common technical complication in cement-retained dental implants. To retrieve screw loosened dental abutment, making abutment screw channel (ASC) is a useful method to access the abutment screw. This article reviews the methods for preparing ASC of cement-retained implant supported restoration.

The search was conducted on PubMed, Google Scholar, and Scopus. The keywords were screw loosening, cement-retained implant restoration, screw access hole, abutment screw channel and retrieving.

Having applied the inclusion and exclusion criterion, 24 articles, 21 technical notes, 1 case report, and 2 reviews were found.

The techniques reviewed were categorized into 3 groups of marking techniques, customized guides, and imaging techniques with different outcomes.