Detection of misfits at the abutment-prosthesis interface in the esthetic zone: Implications of the radiographic technique and the magnitude of the misfit

de Oliveira Mota, Vanessa Pacheco; Braga, Manuella Soussa; Loss, Amanda Alves; Mello, Hugo Nogueira; Rosetti, Elizabeth Pimentel; de-Azevedo-Vaz, Sergio Lins

doi:10.1016/j.prosdent.2023.05.026

Cited by 2 publications

(1 citation statement)

References 33 publications

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“…Other works present opposite results in that the non-original components are interchangeable and do not lead to screw loosening if manufacturing discrepancies are lower than 10 microns [5,[24][25][26]. Manufacturers are not able to guarantee failure-free screws, so for each system, it is worth having proprietary tools for removing broken screws and, above all, using radiographic detection of the gap at the implant-abutment interface [27,28].…”

Section: Discussionmentioning

confidence: 99%

Dental Implant Abutment Screw Loss: Presentation of 10 Cases

Soleimani,

Żmudzki,

Pakieła

et al. 2024

JFB

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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.

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