Title: 0957 - Comparison of Corrosion Products Produced by Various Implant-Abutment Couplings


Matilde Duarte Silva (Presenter)
UCL Eastman Dental Institute, University College London, London, UK

Terry Walton, University of Sydney
Ghada Alrabeah, UCL Eastman Dental Institute, University College London, London, UK
Haralampos Petridis, UCL Eastman Dental Institute, University College London, London, UK


Objectives: Implant and abutment materials may suffer from corrosion when coupled in the oral environment. Corrosion products released into the peri-implant tissues may cause an inflammatory response leading to marginal bone loss. The aim of this project was to compare the metal ion release of 3 types of gold abutments when coupled to one type of titanium implant and to investigate the influence of time on the ionic release.

Methods: Eight GoldAdaptTM (Nobel Biocare®, Zurich, Switzerland) and 16 castable UCLA abutments (Biomet 3i™, Florida, USA) were cast in V-Classic high-gold alloy (Cendres+Métaux SA, Biel, Switzerland). Half of the UCLA abutments were additionally gold-plated with Aurogold solution (Alphabond Dental Pty Ltd, Roseville, Australia). Each abutment was screwed to a Brånemark System® Mk III TiUniteTM implant (Nobel Biocare®, Zurich, Switzerland). The couples (3 groups, n=8) were immersed in 1% lactic acid and subjected to cyclic loading for the equivalent of 3, 5 and 12 months in function. At each time-point, the immersion liquid was analysed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) for quantification of titanium (Ti), palladium (Pd), platinum (Pt) and gold (Au) ions. Pre- and post-treatment Scanning Electron Microscopy and Energy-dispersive X-ray Spectroscopy (SEM/EDX) were used to evaluate the surface changes and the elemental composition of the specimens.

Results: The released concentration of Pd (p=0.001), Pt (p=0.021) and Au (p=0.001) significantly decreased with time, whereas that of Ti increased (p=0.018). All groups demonstrated no significant differences in most ionic concentrations. SEM/EDX showed pitting on the fit surface of all components as well as the presence of unreleased particles.

Conclusions: The investigated abutment fabrication method did not significantly affect ion release. Time significantly affected ionic release in all groups. During the first 12 months of simulated function, implant-abutment couples released concentrations of ions; importantly, Ti release kept increasing with time.

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE