The structure and corrosive properties of the CoCr-base dental alloy obtained by soft material milling followed by sinterization

Rylska, D.; Sokołowski, G.; Konieczny, Bartłomiej; Sokołowski, Jerzy

doi:10.5604/17348412.1225911

Cited by 3 publications

(4 citation statements)

References 22 publications

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“…In this study, Soft Metal (MSM and sintering) exhibited a homogenous structure, on the contrary to MoguCera C (casting). Similar results were obtained by other researchers [ 34 , 38 , 39 , 44 , 45 ]. The highly inhomogeneous structure of MorguCera C resulted in an increased susceptibility to corrosion, due to a less stable passive oxide layer on the surface; as observed by other authors as well [ 16 , 46 ].…”

Section: Discussionsupporting

confidence: 92%

“…Procedures of porcelain firing to metal cause metal surface oxidation and the formation of mill scale, which may cause corrosion, and therefore impair the biological properties of the material [ 28 , 29 , 30 , 31 , 32 , 33 ]. The literature on milling in soft material with subsequent sintering concentrates mostly on fusion to porcelain [ 22 , 34 , 35 , 36 , 37 ] with scarce research on corrosion resistance [ 38 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

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Does Simulated Porcelain Firing Influence Corrosion Properties of Casted and Sintered CoCr Alloys?

2021

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The aim of the study was to evaluate how heat processing used for dental porcelain firing influences the surface properties of sintered and casted CoCr alloy. Two CoCr alloys, Soft Metal LHK (milling in soft material and sintering) and MoguCera C (casting), were used for the study. The samples were examined using SEM–EDS before and after heat treatment. Next, corrosion examinations (Ecorr, jcorr, polarization curve, Ebr) were performed. Finally, the samples were evaluated under SEM. Based on the results, the following conclusions might be drawn: 1. Thermal treatment (porcelain firing) did not cause chemical impurities formation on the surface of CoCr alloy; 2. The sintered metal exhibited significantly higher corrosion resistance than the casted one due to its homogeneity of structure and chemical composition; 3. Heat treatment (porcelain firing) decreased the resistance of casted and sintered CoCr alloy to electrochemical corrosion. The reduction in corrosion resistance was significantly higher for the casted alloy than for the sintered alloy; 4. The corrosion resistance decrease might be due to an increased thickness and heterogeneity of oxide layers on the surface (especially for the casted alloy). The development of corrosion process started in the low-density areas of the oxide layers; 5. The sintered metal seems to be a favourable framework material for porcelain fused to metal crowns.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Does Simulated Porcelain Firing Influence Corrosion Properties of Casted and Sintered CoCr Alloys?

2021

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“…They reported that the microstructure of the MSM specimen was characterized by a fine grain size structure and showed consistently significantly smaller releases of Co ions in comparison with cast specimens. D. Rylska et al conducted examinations of the structure and corrosion resistance of MSM Co-Cr base elements and confirmed that the sintered alloy exhibited better self-passivating behavior in comparison to cast material [50].…”

Section: Discussionmentioning

confidence: 97%

Corrosion Resistance of Cr–Co Alloys Subjected to Porcelain Firing Heat Treatment—In Vitro Study

et al. 2021

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The procedure of ceramics fusion to cobalt–chromium (Co–Cr) base dental crowns affects their corrosion behavior and biological tolerance. This study’s purpose was to comparatively evaluate the effect of heat treatment (HT) applicable for dental ceramics firing on the corrosion properties among Co–Cr base alloys fabricated via different methods: casting (CST), milling soft metal and post sintering (MSM), and selective laser melting (SLM). All specimens were subjected to a heat treatment corresponding to a full firing schedule. The microstructure and elemental composition of oxidized surfaces were investigated by scanning electron microscopy and energy dispersive spectroscopy. Corrosion properties were examined by electrochemical potentiodynamic polarization tests. The values of jcorr, Ecorr, Rp, and breakdown potential Ebr were estimated. The oxide layers formed during the HT process corresponded to the composition of the original alloys’ structure. Among the thermal treated alloys, SLM showed the highest corrosion resistance, followed by the MSM and CST. This may be attributed to uniform distribution of alloying elements in homogenous structure and to the reduced porosity, which enhances corrosion resistance and decreases the risk of crevice corrosion. The overall corrosion behavior was strongly influenced by the segregation of alloying elements in the microstructure, thus, is directly determined by the manufacturing method.

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“…Rylska et.al., corrosive properties and structure of the Co-Cr base orthodontic alloy by soft material with sinterization. The polarisation, SEM analyses suggest more corrosion resistance of sintered element [9]. To investigation of corrosion resistance of Ni-Ti orthodontics in artificial saliva have been studied by polarisation and SEM analysis [10].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behaviour of SS18/8 Bracket in Presence of Limcee Tablet with Artificial Saliva

2018

AJBPR

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The effects of Limcee on corrosion of the SS18/8 bracket in artificial saliva have been studied by polarisation and AC-impedance spectra. These analysis indicates corrosion resistance of SS18/8 bracket increases incidence of Limcee (300ppm) with artificial saliva due to increases in Rpol (Linear polarisation Resistance), Rt (Charge transfer resistance) and decreases in Cdl (Double layer capacitance), Icorr (corrosion current). Increase inhibition efficiency of SS18/8 bracket is due to incidence of components of Limcee tablet. Electrochemical studies reveal Limcee tablet (cathodic) effective corrosion inhibitor on SS18/8 bracket with artificial saliva. Hence these analysis recommended that people implies with orthodontics made of SS18/8 need not hesitate, to take Limcee tablet oraly.

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The structure and corrosive properties of the CoCr-base dental alloy obtained by soft material milling followed by sinterization

Cited by 3 publications

References 22 publications

Does Simulated Porcelain Firing Influence Corrosion Properties of Casted and Sintered CoCr Alloys?

Does Simulated Porcelain Firing Influence Corrosion Properties of Casted and Sintered CoCr Alloys?

Corrosion Resistance of Cr–Co Alloys Subjected to Porcelain Firing Heat Treatment—In Vitro Study

Electrochemical Behaviour of SS18/8 Bracket in Presence of Limcee Tablet with Artificial Saliva

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