J Korean Acad Prosthodont.  2018 Jul;56(3):212-217. 10.4047/jkap.2018.56.3.212.

The incidence of the abutment screw loosening and its affecting factors in posterior implant restorations

• Hong SJ
• Bae JY
• Kim HH

• KMID: 2416813
• DOI: http://doi.org/10.4047/jkap.2018.56.3.212

Abstract

PURPOSE
This study was to assess clinically the incidence of abutment screw loosening of posterior implant-supported fixed prosthesis and its affecting factors.
MATERIALS AND METHODS
391 implant-supported crowns restored from January 2013 to January 2016 were included in this study. All restorations were fabricated with either a single crowns or a splinted crown, and cemented with temporary cement. The incidence of abutment screw loosening is investigated and gender, restoration position, opposing teeth, restoration type, abutment connection type were assessed as possible factors affecting abutment screw loosening.
RESULTS
During the observation period (2 - 5 years), abutment screw loosening was found in 29 restorations (7.4%). It took 3 to 48 months (means 19.5 months) to loose the screw, and three of these implants were fractured. Among the factors considered, there were statistically significant differences at abutment screw loosening rate between molar group (9.4%) and premolar group (2.6%) (P<.019). According to the type of opposing teeth, there were statistically significant differences between nature teeth (74.7%) and implant (25.0%), removable denture (3%) (P<.019). The other possible factors did not have a significant effect on loosening of the abutment.
CONCLUSION
The incidence of abutment screw loosening in posterior restoration was 7.4%. Abutment screw loosening were more likely to occur in molars group than premolar group, and according to the opposing teeth, there were the greatest frequency in nature teeth than implant and removal denture. There was a statistically significant difference.

Keyword

Screw loosening; Technical complication; Implant-supported dental prosthesis

MeSH Terms

Bicuspid
Crowns
Dental Prosthesis, Implant-Supported
Dentures
Incidence*
Molar
Prostheses and Implants
Splints
Tooth

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