Abstract
PurposeThe purpose of this study was to investigate the corrosion resistance of galvanically coupled SLA and anodized implant surfaces with a Co‐Cr alloy.Materials and MethodsThree groups were included in this study. The first (SLA) was composed of SLA implants (Institut Straumann, Basel, Switzerland), the second (ANO) of NobelReplace® (Nobel Biocare, Göteborg, Sweden), and the third (MIX) of both implant systems combined. All groups were assembled with a single Co‐Cr superstructure. Electrochemical testing included open‐circuit potential, electrochemical impedance spectroscopy, cyclic potentiodynamic polarization, and chronoamperometric current‐time measurements. The quantitative results (EOCP, ECORR, ICORR, EPROT, RP, and ICA) were statistically analyzed by one‐way ANOVA and Tukey's post‐hoc multiple comparison test (α = 0.05)ResultsAll the aforementioned parameters showed statistically significant differences apart from ECORR and EPROT. The evaluation of qualitative and quantitative results showed that although SLA had higher corrosion resistance compared with ANO, it had less resistance to pitting corrosion. This means that SLA showed increased resistance to uniform corrosion but less resistance if pitting corrosion was initiated. In all cases, MIX showed intermediate behavior.ConclusionThe corrosion resistance of implant‐retained superstructures is dependent on the electrochemical properties of the implants involved, and thus different degrees of intraoral corrosion resistance among different implant systems are anticipated.
Highlights
Contemporary dental implants are made by the use of commercially pure titanium (Ti) and its alloys, thanks to their osseo‐inductive properties, biocompatibility, corrosion resistance, and good mechanical properties (Le Guehennec, Soueidan, Layrolle, & Amouriq, 2007)
The combination of high corrosion resistance with the fact that, in clinical conditions, the implant surface will be covered by soft tissue at the cervical region and by attached bone at the treated Ti surface did not support corrosion as a primary concern
The implants were inserted at the preindicated positions into the resin blocks at 50 rpm (Motor unit, Nobel Biocare USA, Yorba Linda, CA, USA), leaving only 2 mm of the treated root region exposed below the collar
Summary
Contemporary dental implants are made by the use of commercially pure titanium (Ti) and its alloys (mainly Ti‐6Al‐4V), thanks to their osseo‐inductive properties, biocompatibility, corrosion resistance, and good mechanical properties (Le Guehennec, Soueidan, Layrolle, & Amouriq, 2007). In certain situations, a clinician may be confronted with the use of a metallic superstructure connected to different implant systems, with significant differences in the electrochemical properties of treated surfaces (Al Jabbari, Mueller, Al‐Rasheed, & Zinelis, 2016) In such an assembly, the galvanic actions among the different alloys might have a crucial effect on the corrosion resistance of the structure, altering the electrochemical properties of the different components—a scenario that has not been thoroughly investigated. The galvanic actions among the different alloys might have a crucial effect on the corrosion resistance of the structure, altering the electrochemical properties of the different components—a scenario that has not been thoroughly investigated The aim of this in vitro study was to evaluate the corrosion behavior of two commonly used Ti implant systems, retained with a single Co–Cr superstructure. The null hypothesis was that no significant differences would be identified in the electrochemical properties of the different implant systems
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