Effect of Double Screw on Abutment Screw Loosening in Single-Implant Prostheses

Screw loosening is the most frequently occurring mechanical complication in implant restoration.1 Prevention of screw loosening depends on implantabutment joint stability and the preload determined by torque. Efforts have been made to increase preload and prevent screw loosening.2 In a previous study, double nut tightening was found to be effective for preventing screw loosening.3 The present study was conducted to examine the validity of a double-screw abutment developed in view of a double nut-tightening method on prevention of screw loosening compared with the existing single-screw abutment.

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