Dental Implant Abutment Screw Loss: Presentation of 10 Cases

Author:

Soleimani Maryam12ORCID,Żmudzki Jarosław1ORCID,Pakieła Wojciech1ORCID,Jaśkowska Anna3,Krasny Kornel3

Affiliation:

1. Department of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology, 18a Konarskiego Str., 41-100 Gliwice, Poland

2. Doctoral School, Silesian University of Technology, 2A Akademicka Str., 44-100 Gliwice, Poland

3. Anident Dental Clinic, 12 Belgradzka Str., 02-793 Warszawa, Poland

Abstract

Re-tightening the loosened dental implant abutment screw is an accepted procedure, however the evidence that such screw will hold sufficiently is weak. The purpose of this study was material analysis of lost dental implant abutment screws made of the TiAlV alloy from various manufacturers, which became lost due to unscrewing or damaged when checking if unscrewed; undamaged screws could be safely re-tightened. Among 13 failed screws retrieved from 10 cases, 10 screws were removed due to untightening and 3 were broken but without mechanical damage at the threads. Advanced corrosion was found on nine screws after 2 years of working time on all surfaces, also not mechanically loaded. Sediments observed especially in the thread area did not affect the corrosion process because of no pit densification around sediments. Pitting corrosion visible in all long-used screws raises the question of whether the screws should be replaced after a certain period during service, even if they are well-tightened. This requires further research on the influence of the degree of corrosion on the loss of the load-bearing ability of the screw.

Publisher

MDPI AG

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