Ductility and structure of some cobalt-base dental casting alloys

Herø, H.; Syverud, Morten; Gjønnes, J.; Horst, Jens Anton

doi:10.1016/0142-9612(84)90016-4

Cited by 26 publications

(9 citation statements)

References 6 publications

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“…M 7 C 3 and M 23 C 6 (where M stands for any metal) are known as Cr-rich carbides,1,11 although MC and M 6 C types have also been detected in Co alloys 5. Despite the positive effects in terms of mechanical and electrochemical properties, the addition of Cr should be made with care to avoid the formation of the hard and brittle Cr-rich sigma phase, which decreases corrosion resistance due to local Cr depletion around the sigma phase precipitates.…”

Section: Properties Of Co-cr Aloys For the Production Of Rpd Frameworkmentioning

confidence: 99%

“…Only one manufacturer provides the exact composition of C, and thus the effect of C content cannot be correlated with the mechanical properties given in Table 2. Several carbides, including MC, M 6 C, M 7 C 3 , and M 23 C 6 , have been detected in dental Co-Cr alloys 5,11. Although carbide formation is the primary strengthening mechanism,11 solid solution and intermetallic compound formation strengthening also occurs.…”

Section: Properties Of Co-cr Aloys For the Production Of Rpd Frameworkmentioning

confidence: 99%

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Physico-mechanical properties and prosthodontic applications of Co-Cr dental alloys: a review of the literature

Jabbari

2014

J Adv Prosthodont

177

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Cobalt-Chromium (Co-Cr) alloys are classified as predominantly base-metal alloys and are widely known for their biomedical applications in the orthopedic and dental fields. In dentistry, Co-Cr alloys are commonly used for the fabrication of metallic frameworks of removable partial dentures and recently have been used as metallic substructures for the fabrication of porcelain-fused-to-metal restorations and implant frameworks. The increased worldwide interest in utilizing Co-Cr alloys for dental applications is related to their low cost and adequate physico-mechanical properties. Additionally, among base-metal alloys, Co-Cr alloys are used more frequently in many countries to replace Nickel-Chromium (Ni-Cr) alloys. This is mainly due to the increased concern regarding the toxic effects of Ni on the human body when alloys containing Ni are exposed to the oral cavity. This review article describes dental applications, metallurgical characterization, and physico-mechanical properties of Co-Cr alloys and also addresses their clinical and laboratory behavior in relation to those properties.

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Section: Properties Of Co-cr Aloys For the Production Of Rpd Frameworkmentioning

confidence: 99%

Section: Properties Of Co-cr Aloys For the Production Of Rpd Frameworkmentioning

confidence: 99%

Physico-mechanical properties and prosthodontic applications of Co-Cr dental alloys: a review of the literature

Jabbari

2014

J Adv Prosthodont

177

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“…For the long-term framework behavior perspective, it is very important to take into account some key-factors such as the quality of surface finishing, marginal accuracy, mechanical properties, corrosion resistance, ion-release behavior, and of course biocompatibility [27][28][29][30][31]. One of the most important aspects is the accuracy, the minimization of the gaps and high precision in the adjustment of the structures [32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of CoCr Dental-Prosthesis Restorations Made by Three Manufacturing Processes. Influence of the Microstructure and Topography

Padrós¹,

Punset

Molmeneu

et al. 2020

Metals

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The aim of this study is to compare the mechanical properties of three different dental restorations’ manufacturing processes (CADCAM milling, casting and laser sintering) generated by only one laboratory scanner focusing on marginal fit analysis and their mechanical properties. A chrome-cobalt (Cr-Co) alloy from the same batch was used for three different methods to make an implant abutment. This simulates a maxillary right first molar that was fixed in a hemi-maxillary stone model. Five scans were performed by each tested framework. Nine frameworks were manufactured for each manufacture procedure. Field-Emission Scanning Electron Microscope (FE-SEM) direct vision was used to marginal gap measurement in five critical points for each specimen. In order to fix the samples in the microscope chamber, the restorations were submitted at a compression load of 50 N. The samples always have the same orientation and conditions. The resolution of the microscope is 4 nm and it is equipped by J image software. The microstructure of the samples was also determined with the FE-SEM equipped with EDS-microanalysis. Roughness parameters were measured using White Light Interferometry (WLI). The arithmetical mean for the Ra and Rq of each sample was calculated. The samples were mechanically characterized by means of microhardness and flexural testing. Servo-hydraulic testing machine was used with cross-head rate of 1 mm/min. Two-way ANOVA statistical analysis was performed to determine whether the marginal discrepancies and mechanical properties were significantly different between each group (significance level p < 0.05). The overall mean marginal gap values were: from 50.53 ± 10.30 µm for the samples produced by CADCAM to 85.76 ± 22.56 µm for the samples produced by the casting method. Laser sintering presents a marginal gap of 60.95 ± 20.66 µm. The results revealed a statistically significant difference (p-value < 0.005) in the mean marginal gap between the CADCAM systems studied. The higher flexure load to fracture for these restorations were for CADCAM restoration and the lower was for the casting samples. For these restorations, CADCAM Restoration yielded a higher flexure load to fracture and Casting ones yielded the lower. Porosity and microstructure play a very important role in the mechanical properties.

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“…[1][2][3][4] However, it is indicated that the cast alloys (the ASTM-75 specification) show low ductility compared to the forged alloys (the ASTM-799 and ASTM-1537 specification), and Co-based dental casting alloys occasionally fracture during the small plastic deformation caused by the adjustment. 5,6) It was reported that under the ascast condition, Ni-, C-and N-free Co-Cr-Mo alloys exhibit low ductility owing to the formation of shrinkage porosity, interdendritic segregation, and intermetallic inclusions at the grain boundaries. 7) Especially, the phase formed along the interdendritic region during the solidification gives rise to brittle fracture.…”

Section: Introductionmentioning

confidence: 99%

Significant Improvement in Mechanical Properties of Biomedical Co-Cr-Mo Alloys with Combination of N Addition and Cr-Enrichment

Lee¹,

2008

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An improvement in the mechanical properties of a biomedical Ni-free Co-Cr-Mo alloy under as-cast condition has been examined by means of tensile tests and microstructure observations. The solubility of N in Co-Cr-Mo alloys increases with increasing Cr content from 29 to 34 mass%. This results in a significant improvement in mechanical properties such as yield stress, tensile strength, and fracture elongation. The improvement in the mechanical properties results from the phase stabilization and inhibition of the phase formation due to N addition. Increasing the Cr content also has contributed to the improved mechanical properties.

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Ductility and structure of some cobalt-base dental casting alloys

Cited by 26 publications

References 6 publications

Physico-mechanical properties and prosthodontic applications of Co-Cr dental alloys: a review of the literature

Physico-mechanical properties and prosthodontic applications of Co-Cr dental alloys: a review of the literature

Mechanical Properties of CoCr Dental-Prosthesis Restorations Made by Three Manufacturing Processes. Influence of the Microstructure and Topography

Significant Improvement in Mechanical Properties of Biomedical Co-Cr-Mo Alloys with Combination of N Addition and Cr-Enrichment

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