Corrosion properties of low carbon CoCrMo and additively manufactured CoCr alloys for dental applications

Mace, Annsley; Khullar, Piyush; Bouknight, Cassidy; Gilbert, Jeremy

doi:10.1016/j.dental.2022.06.021

Cited by 26 publications

(26 citation statements)

References 12 publications

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“…Figure3B, and with EDS analysis performed previously by Mace, et al, the subcellular structure features columnar cells which result in not only a distinct physical orientation, but a chemical heterogeneity within the grains 4. This raises interesting questions about the nature…”

supporting

confidence: 53%

“…The larger, less uniform AM alloy grains (Figure 3A) may affect wear rate from fretting and fretting corrosion. These larger grains (up to 30 μm) reach diameters larger than the width of the contact, meaning wear can be only 4 This raises interesting questions about the nature of fretting and fretting corrosion as a function of the asperity diameter relative to the grain size and orientation and how the wear process progresses. When the contact diameter is larger than a single grain, the plastic deformation can be multicrystalline, whereas if the asperity contact diameter is smaller than the grain size, one single crystal or bicrystal deformation takes place.…”

Section: Microstructurementioning

confidence: 99%

“…F I G U R E 1 1 Current density and corrosion potential response (E corr ) of AM CoCrMoW to higher levels of oxidizing agent (10 mM H 2 O 2 ) compared to in PBS during anodic polarization. 4 ASTM F-1537 wrought LC CoCrMo is reported as having a composition (by weight) of 63%-69% Co, 26%-30% Cr, 5%-7% Mo, and balance C, Ni, Fe, Si, Mn. 23 The most abundant elements by weight of Co and Cr each have negative electrochemical potentials (V vs. SHE), listed below, making them highly reactive and readily oxidized at the surface.…”

Section: Fretting Currentsmentioning

confidence: 99%

“…3 While there is data on the corrosion, microstructure, and osteointegration of additively manufactured Co Cr alloys, there is less on the fretting corrosion and wear properties. [4][5][6] This is especially true in relation to dental applications, since oral cavities feature varying situations influencing the tribocorrosion response of such alloys. 1 Additive manufacturing is growing in orthopedics in total joint arthroplasty for patient-specific implants and instrumentation, porous structures, as well as being applied in other novel applications.…”

Section: Introductionmentioning

confidence: 99%

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Low cycle fretting and fretting corrosion properties of low carbon CoCrMo and additively manufactured CoCrMoW alloys for dental and orthopedic applications

Mace

Gilbert

2023

J Biomed Mater Res

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Additive manufacturing (AM) of CoCrMo metallic implants is growing in the orthopedic and dental fields. This is due to the traditional alloy's excellent corrosion resistance and mechanical properties. AM processes like selective laser melting (SLM) require less time, materials, and waste than casting or subtractive manufacturing complex‐geometry structures (bridges, partial dentures, etc.). The objective of this work was to investigate the low cycle tribological and tribocorrosion characteristics of AM CoCrMoW alloys compared to wrought LC CoCrMo (ASTM F‐1537) to assess this AM alloy's performance. Fretting and tribocorrosion testing was performed in air (wear only), PBS (wear + corrosion), and PBS with 10 mM H2O2 (wear + corrosion + inflammation) by a single diamond asperity. No variation between alloys in volume of material removed (p = .12), volume of plastic deformation (p = .13), and scratch depth (p = .84) showed that AM was substantially similar in wear resistance to LC in air and PBS. AM exhibited significantly higher fretting currents (p < .01) at loads up to 100 mN (IAMPBS = 57 nA and IAMH2O2 = 49 nA) than LC CoCrMo (ILCPBS = 30 nA) and (ILCH2O2 = 29 nA). In PBS, wear track depth linearly correlates to fretting current, averaged over 100 cycles. Additionally, fretting currents of both alloys were significantly lower in simulated inflammatory conditions compared to PBS alone. AM alloy has generally similar wear and tribocorrosion resistance to wrought LC CoCrMo and would be ideal for patient specific dentistry or orthopedics where precise, complex geometries are required.

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supporting

confidence: 53%

Section: Microstructurementioning

confidence: 99%

Section: Fretting Currentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low cycle fretting and fretting corrosion properties of low carbon CoCrMo and additively manufactured CoCrMoW alloys for dental and orthopedic applications

Mace

Gilbert

2023

J Biomed Mater Res

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“…16−18 Cobalt-based medical metal materials have excellent mechanical properties, wear resistance, and corrosion resistance, but the release of cobalt, nickel, and other metal ions in the constituent elements easily causes cell and tissue necrosis. 19 Due to the best biocompatibility, matching mechanical properties, and good corrosion resistance, Ti alloys are recognized as the most suitable implant material. 11,20 Various types of Ti implants are widely used in clinical medical restoration.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification and Functionalities for Titanium Dental Implants

Sun,

Liu,

Wang

et al. 2023

ACS Biomater. Sci. Eng.

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Dental implants have become the mainstream strategy for oral restoration, and implant materials are the most important research hot spot in this field. So far, Ti implants dominate all kinds of implants. The surface properties of the Ti implant play decisive roles in osseointegration and antibacterial performance. Surface modifications can significantly change the surface micro/nanotopography and composition of Ti implants, which will effectively improve their hydrophilicity, mechanical properties, osseointegration performance, antibacterial performance, etc. These optimizations will thus improve implant success and service life. In this paper, the latest surface modification techniques of Ti dental implants are systematically and comprehensively reviewed. The various biomedical functionalities of surface modifications are discussed in-depth. Finally, a profound comment on the challenges and opportunities of this frontier is proposed, and the most promising directions for the future were explored.

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Additive Manufacturing of Metal Load‐Bearing Implants 2: Surface Modification and Clinical Challenges

Zanetti,

Fragomeni,

Sanguedolce

et al. 2024

Chemie Ingenieur Technik

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Additive manufacturing (AM) permits sustainable production of personalized load‐bearing metal implants with complex structures. Regulations prescribe that implants have to meet strict requirements to not harm patients, and production technique should allow the certification of their performance. Process, materials, operating parameters, and customization to patient's needs could limit AM. Layer‐by‐layer material deposition and repeated thermal cycles may make outer surface of AM implants chemically and physically uneven and rough, eliciting biological response of host tissue and hindering therapeutic success. In this paper, we discuss the clinical challenges that AM must overcome to replace traditional techniques in implant and prostheses design.

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Corrosion properties of low carbon CoCrMo and additively manufactured CoCr alloys for dental applications

Cited by 26 publications

References 12 publications

Low cycle fretting and fretting corrosion properties of low carbon CoCrMo and additively manufactured CoCrMoW alloys for dental and orthopedic applications

Low cycle fretting and fretting corrosion properties of low carbon CoCrMo and additively manufactured CoCrMoW alloys for dental and orthopedic applications

Surface Modification and Functionalities for Titanium Dental Implants

Additive Manufacturing of Metal Load‐Bearing Implants 2: Surface Modification and Clinical Challenges

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