Assessment of corrosion resistance of cast cobalt- and nickel-chromium dental alloys in acidic environments

Mercieca, Sven; Conti, Malcolm Caligari; Buhagiar, Joseph; Camilleri, Josette

doi:10.5301/jabfm.5000383

Cited by 26 publications

(21 citation statements)

References 17 publications

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“…Nickel exposure is associated with a number of systemic disorders. 4 In case of metal contact allergy, exposure to dental crowns could play a role. 5 Allergens can leach from an alloy and dissolve in the oral environment.…”

Section: Introductionmentioning

confidence: 99%

“…Mercieca studied the corrosion resistance of cast cobalt‒ and Ni‒Cr dental alloys in acidic saliva and concluded that Ni‒Cr alloys are unstable in solution and leach Ni ions. 4 The use of mouthwashes containing fluoride, chloride or essential oils is occasionally recommended by prosthodontist as an adjunctive therapy to reduce the risk of caries and plaque formation and overcome periodontal conditions, such as gingivitis. 11 However, only a limited number of studies have investigated the relationship between mouthwashes and metal corrosion of Ni‒Cr alloys.…”

Section: Introductionmentioning

confidence: 99%

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Nickel ion release from dental alloys in two different mouthwashes

Jafari

Rahimzadeh

Hekmatfar

2019

J Dent Res Dent Clin Dent Prospects

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Background. Mouthwashes are widely used as adjuncts to mechanical oral hygiene procedures. Nonetheless, there is little information regarding the effect of various mouthwashes on the amount of ions released from the nickel-chromium (Ni‒Cr) alloys used in the fabrication of fixed prostheses. Therefore, the present study was conducted to evaluate the effect of two types of mouthwash on the release of Ni ions from dental alloys. Methods. Forty-two disk-shaped specimens were prepared with a diameter of 10 mm and a height of 2 mm. Two mouthwashes were examined in this study: Oral B and Listerine. A control group was also considered using distilled water. Each Ni‒Cr disk was immersed in the mouthwashes and distilled water in polypropylene test tubes, and then incubated at 37°C to simulate the oral temperature. After 45 days of incubation, the samples were tested for Ni ions using inductively coupled plasma mass spectroscopy. Data were analyzed using ANOVA. Results. In the Halita group subjects exhibited 2.04±0.65 reduction in OLS. OLS reduction in the chlorhexidine group was 1.95±0.74. Statistical analysis showed no significant difference between the two groups (P>0.05). Conclusion. As the results indicated, the amount of ion release was within the safe limits in the two experimental groups. However, it is recommended that prescribe Listerine mouthwash should not be prescribed for the patients with a history of Ni allergy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nickel ion release from dental alloys in two different mouthwashes

Jafari

Rahimzadeh

Hekmatfar

2019

J Dent Res Dent Clin Dent Prospects

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“…Based on experimental data, it was established that thermal reprocessing effects lead to the enhancement of commonly used dental commercial alloys and their demerits regarding corrosion and biocompatibility [17]. As an example, recasting of alloys increased cytotoxicity level including ion release from NiCr and CoCr alloys; CoCr alloys were more adversely affected by the recasting than the NiCr alloys [18]. Regarding electrochemical stability after reprocessing in various environments, a decrease in corrosion rate common for both types of alloys NiCr and CoCr, respectively, was observed.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Electrochemical and Morphological Investigation on the Behavior of NiCr and CoCr Dental Alloys at Various Temperatures

Golgovici

Prodana

Ionascu

et al. 2021

Metals

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The purpose of our study is to compare the behavior of two reprocessed dental alloys (NiCr and CoCr) at different temperatures considering the idea that food and drinks in the oral cavity create various compositions at different pH levels; the novelty is the investigation of temperature effect on corrosion parameters and ion release of dental alloys. Electrochemical stability was studied together with morphology, elemental composition and ions release determination. The results obtained are in good concordance: electrochemistry studies reveal that the corrosion rate is increasing by increasing the temperature. From SEM coupled with EDS, the oxide film formed on the surface of the alloys is stable at low temperatures and a trend to break after 310K. ICP-MS results evidence that in accordance with increasing temperature, the quantities of ions released from the alloys immersed in artificial saliva also increase, though they still remain small, less than 20 ppm.

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“…Cobalt-chromium-based alloys (Co-Cr alloy) are widely used for the fabrication of removable partial dentures and metal ceramic prostheses [16]. Co-Cr alloy exhibits high strength, good cytocompatebility and are nonmagnetic [17,18]. Additionally, Co-Cr alloys have also been found to be more resistant to corrosion than Ni-Cr alloys [16,18].…”

Section: Introductionmentioning

confidence: 99%

“…Co-Cr alloy exhibits high strength, good cytocompatebility and are nonmagnetic [17,18]. Additionally, Co-Cr alloys have also been found to be more resistant to corrosion than Ni-Cr alloys [16,18]. These properties make Co-Cr ideal alloys to be used in the oral cavity [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Khat Extract (Catha edulis) on Corrosion Resistance of Co-Cr Dental Alloys

Al-Subari

Merzouk

Kabak

et al. 2021

BDS

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Objective: The aim of this experimental study was to assess the effect of khat extract with different concentrations on the corrosion resistance of cobalt-chromium (Co-Cr) dental alloys used for removable denture. Material and Methods: The corrosion resistance of three Co-Cr alloys (Neobond II®, Kera 501® and PD Casta H®) was evaluated in artificial saliva in presence of three different concentrations of khat extracts. Fusayama-Meyer artificial saliva was used as a reference solution. The corrosion properties of the alloys were analyzed using potentiodynamic polarization, electrochemical impedance spectroscopy and surface analysis. The data was presented in means, standard deviations, and related figures. Comparison between the different concentrations was done using 1-way ANOVA test. The surface analysis was performed using scanning electron microscopy (SEM). Results: the results showed that the corrosion resistance of the three alloys tested (Neobond II®, Kera 501® and PD Casta H®) decreased in artificial saliva containing khat extract compared with that of the reference solution. Additionally, the corrosion resistance of the three Co-Cr dental alloys decreased by increasing the concentration of khat extract. Furthermore, the results indicate that Neobond II® alloy showed the least corrosion resistance compared with that of Kera 501® and PD Casta H® alloys. Conclusion: Khat extract with different concentrations had negative impact on the corrosion resistance of Cr-Co alloys. More in-vivo studies are highly recommended to confirm the results of the present study Keywords Khat; Catha edulis; Partial denture; Corrosion resistance.

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Assessment of corrosion resistance of cast cobalt- and nickel-chromium dental alloys in acidic environments

Abstract: Ni-Cr alloys are unstable in solution and leach nickel. Co-Cr alloys should be preferred for clinical use.

Cited by 26 publications

References 17 publications

Nickel ion release from dental alloys in two different mouthwashes

Nickel ion release from dental alloys in two different mouthwashes

A Comparative Electrochemical and Morphological Investigation on the Behavior of NiCr and CoCr Dental Alloys at Various Temperatures

Influence of Khat Extract (Catha edulis) on Corrosion Resistance of Co-Cr Dental Alloys

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