Influence of oral pH Environment in the Corrosion Resistance of Cr-Co-Mo alloy Used for Dentistry Prosthetic Components

Soares, Francielly Moura de Souza; Santana, Ana Isabel de Carvalho; Santos, Luíza Braga Ferreira dos; Gomes, Paula Anastácia Morais Cairo; Monteiro, Emília dos Santos; Coimbra, Maria Elisa Rodrigues; Elias, Carlos Nelson

doi:10.1590/1980-5373-mr-2019-0330

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…CrCoMo alloys showed good corrosion resistance in 0.9% NaCl solution at different pH values (2, 3, and 6) and mouthwash solution. But the corrosion current, particularly in cathodic potentials, increases as the pH decreases [24].…”

Section: Resultsmentioning

confidence: 97%

Galvanic Corrosion of Ti Dental Implants Coupled to CoCrMo Prosthetic Component

Soares

Elias

Monteiro

et al. 2021

International Journal of Biomaterials

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Dental implant systems are composed of an implant, prosthetic components, and a crown. Since the implants are made of commercially pure Ti (cp Ti) and prosthetic components are often made of Ti and CoCrMo alloys, a galvanic couple between these two devices may lead to galvanic corrosion, ions release, and even loss of the implant. This study aimed to investigate the corrosion resistance and measure the galvanic potential between cp Ti alloys (annealed microstructured cp Ti G4 and cold-worked nanostructured cp Ti G4) and a CoCrMo alloy. The corrosion resistance has been characterized by measuring the open circuit potential, the potentiodynamic polarization, the potentiostatic polarization, and the zero-resistance current. The cp Ti has been tested before and after a surface acid treatment. The samples’ surfaces have been examined by scanning electron microscopy, and their surface roughness has been measured by a 3D optical profilometer. The polarization results showed that the CoCrMo alloy showed lower corrosion resistance than cp Ti. The surface acid treatment improves dental implant corrosion resistance. The galvanic analysis showed that the cp Ti without surface treatment behaved as an anode and after the acid treatment has a cathodic behavior in relation to the CrCoMo alloy. The highest value of galvanic current was cp TiG4 acid etched in contact with CoCrMo, in pH 2 solution. The galvanic couple with the lowest current has been the nanostructured cp Ti in contact with CoCrMo alloy.

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Section: Resultsmentioning

confidence: 97%

Galvanic Corrosion of Ti Dental Implants Coupled to CoCrMo Prosthetic Component

Soares

Elias

Monteiro

et al. 2021

International Journal of Biomaterials

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“…Additionally, their corrosion resistance reduces the complications in the section part of the oro-facial system [54,55]. However, corrosion resistance could be reduced due to variation in salivary pH [56]. It was found that in high acidic artificial salivary pH, Co-Cr alloy revealed a poorer corrosion resistance, irrespective of the manufacturing technique used (cast or milled).…”

Section: Discussionmentioning

confidence: 99%

An Updated Review of Salivary pH Effects on Polymethyl Methacrylate (PMMA)-Based Removable Dental Prostheses

et al. 2022

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Salivary pH is a neglected factor that may affect the performance of removable dental prostheses (RDP). This study aimed to review literature in reference to the role of salivary pH on the performance of RDP and materials used for their fabrication. From January 1990 until December 2021, a search was done on PubMed, Scopus, and Web of Science databases using removable dental prostheses, salivary pH, PMMA, Denture base, and physical properties as keywords. Articles that met the inclusion criteria (full-length articles have investigated the effect of salivary pH on RDP materials in vitro and in vivo) were included. Out of 433 articles, 8 articles that met the inclusion criteria were included. All studies used artificial saliva with different salivary pH ranging between 3 and 14. Two articles investigated the role of salivary pH on the cytotoxicity of denture base resins and soft liner. One article studied the durability and retention of attachments, one article analyzed the performance of PEEK materials, one article researched the fatigue resistance of a denture base, one article investigated the corrosion of RPD framework cast and milled Co–Cr, one article studied the strength and clasp retention and deformation of acetal and PEEK materials, and one evaluated changes in mass and surface morphology of CAD–CAM fiber-reinforced composites for the prosthetic framework. Different salivary pH affected all included materials in this review except PEEK materials. The most adverse effect was reported with alkaline and acidic; however, the acidic showed the most deterioration effect. Salivary pH has a role in the selection of material used for RDP fabrication.

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“…They are sufficiently chemically inert, so they are relevant in diminishing irritations, allergic reactions, and general immune system resistance [ 5 , 29 ]. However, because the oral environment can be aggressive due to pH variation, chloride and fluoride ions can decrease the corrosion resistance [ 30 ].…”

Section: Discussionmentioning

confidence: 99%

Experimental Study Regarding the Behavior at Different pH of Two Types of Co-Cr Alloys Used for Prosthetic Restorations

et al. 2021

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Cobalt-chromium (Co-Cr) alloys are widely utilized in dentistry. The salivary pH is a significant factor, which affects the characteristics and the behavior of dental alloys through corrosion. This study aimed to evaluate the corrosion behavior in artificial saliva with different pH values (3, 5.7, and 7.6) of two commercial Co-Cr dental alloys manufactured by casting and by milling. Corrosion resistance was determined by the polarization resistance technique, and the tests were carried out at 37 ± 1 °C, in Carter Brugirard artificial saliva. After the electrochemical parameters, it can be stated that the cast Co-Cr alloy has the lowest corrosion current density, the highest polarization resistance, and the lowest speed of corrosion in artificial saliva with pH = 7.6. In the case of milled Co-Cr alloy, the same behavior was observed, but in artificial saliva with pH = 5.7, it recorded the most electropositive values of open circuit potential and corrosion potential. Although both cast and milled Co-Cr alloys presented a poorer corrosion resistance in artificial saliva with a more acidic pH value, the milled Co-Cr alloy had better corrosion behavior, making this alloy a better option for the prosthetic treatment of patients suffering from GERD.

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Influence of oral pH Environment in the Corrosion Resistance of Cr-Co-Mo alloy Used for Dentistry Prosthetic Components

Cited by 3 publications

References 17 publications

Galvanic Corrosion of Ti Dental Implants Coupled to CoCrMo Prosthetic Component

Galvanic Corrosion of Ti Dental Implants Coupled to CoCrMo Prosthetic Component

An Updated Review of Salivary pH Effects on Polymethyl Methacrylate (PMMA)-Based Removable Dental Prostheses

Experimental Study Regarding the Behavior at Different pH of Two Types of Co-Cr Alloys Used for Prosthetic Restorations

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