Comparison of in vitro biocompatibility of a Co–Cr dental alloy produced by new milling/post-sintering or traditional casting technique

Kim, Hae-Ri; Kim, Young Kyung; Son, Jun Sik; Min, Bok Ki; Kim, Kyo-Han; Kwon, Tae‐Yub

doi:10.1016/j.matlet.2016.05.053

Cited by 26 publications

(28 citation statements)

References 15 publications

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“…In addition, the biocompatibility properties are suitable and are being used in the manufacture of medical and dental prosthetics [3][4][5][6][7]. The use of Co-Cr alloys is widely discussed to manufacture medical and dental implants or prostheses [7][8][9] presenting positive aspects in relation to biocompatibility analysis. The necessity for characterization and biological evaluations, physical-chemical, and mechanical are basic requirements for the development of new biomaterials applied in medical devices.…”

Section: Introductionmentioning

confidence: 99%

Perspective of Additive Manufacturing Selective Laser Melting in Co-Cr-Mo Alloy in the Consolidation of Dental Prosthesis

Mergulhão¹,

Podestá²,

Neves³

2018

Biomaterials in Regenerative Medicine

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This chapter seeks to compare the properties of samples manufactured by additive manufacturing (AM) by the selective laser melting (SLM) technology and compare with the precision casting (PC) processes using the Co-Cr-Mo (ASTM F75) alloy to manufacture of dental prosthesis. This AM process can be manufactured three-dimensional models by means of a laser beam that completely melts particles of powder deposited layer by layer. However, it is still relevant to know the properties of: performance, dimensional, mechanical and microstructural of this laser melting process and compare with a convencional process. The results of mechanical evaluation showed that the SLM technique provides superior mechanical properties compared to those obtained by the PC technique. It is possible to verify that the consolidation by SLM technique results in lower presence of porosity than PC technique. In addition, PC samples presented a gross dendritic microstructure of casting process. Microstructural analysis of SLM samples results in a characteristic morphology of layer manufacturing with ultrafine grains and a high chemical homogeneity. In this way, the development of the present study evidenced to improve the manufacture of customized components (copings) using the SLM technology.

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Section: Introductionmentioning

confidence: 99%

Perspective of Additive Manufacturing Selective Laser Melting in Co-Cr-Mo Alloy in the Consolidation of Dental Prosthesis

Mergulhão¹,

Podestá²,

Neves³

2018

Biomaterials in Regenerative Medicine

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“…The retained fcc structure, which was predominant in the 1350 • C and 1450 • C alloys, is believed to enhance the mechanical properties of the alloys [8,23]. In the 1250 • C group, on the contrary, most matrix phases consisted of the ε phase probably because less rapid cooling facilitated ε-martensite nucleation at a temperature range of 800-875 • C by isothermal aging [3,8,[24][25][26]. In addition, it seems that the recrystallization of the pre-sintered Co-Cr alloy in which the γ phase was predominant (Figure 2a) at the post-sintering temperature of 1250 • C contributed to the formation of the ε phase [27].…”

Section: Discussionmentioning

confidence: 99%

“…Cobalt-chromium (Co-Cr) dental alloys have been in widespread use for the fabrication of fixed and removable partial dentures, mainly due to their excellent mechanical properties [1,2]. The casting method has traditionally been used to produce Co-Cr-based dental metallic restorations [2,3]. However, making a metallic framework by casting is a prolonged and complex process, leading to multiple complications affecting the final quality [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…These digital-based techniques can greatly increase the efficiency of the work time and help prevent operator errors. In these CAD/CAM techniques, Co-Cr-based dental prostheses are produced using either of the two main techniques: subtractive manufacturing (either hard or soft machining) and additive manufacturing (e.g., selective laser melting) [3,5,7,8]. Although additive manufacturing is rapidly expanding in a number of industrial and dental applications, it is still handicapped by the low productivity of the process, poor quality and uncertain mechanical properties of the final structures [9].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Different Post-Sintering Temperatures on the Microstructures and Mechanical Properties of a Pre-Sintered Co–Cr Alloy

Jang

Min

Hong

et al. 2018

Metals

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Although a cobalt–chromium (Co–Cr) blank in a pre-sintered state has been developed, there are few data on the optimal temperature for the alloy in terms of the desired mechanical properties. A metal block (Soft Metal, LHK, Chilgok, Korea) was milled to produce either disc-shaped or dumbbell-shaped specimens. All the milled specimens were post-sintered in a furnace at 1250, 1350 or 1450 °C. The microstructures, shrinkage and density of the three different alloys were investigated using the disc-shaped specimens. The mechanical properties were investigated with a tensile test according to ISO 22674 (n = 6). The number and size of the pores in the alloys decreased with increased temperature. The shrinkage and density of the alloys increased with temperature. In the 1250 °C alloy, the formation of the ε (hexagonal close-packed) phase was more predominant than that of the γ (face-centered cubic) phase. The 1350 °C and 1450 °C alloys showed γ phase formation more predominantly. Carbide formation was increased along with temperature. The 1450 °C group showed the largest grain size among the three groups. In general, the 1350 °C group exhibited mechanical properties superior to the 1250 °C and 1450 °C groups. These findings suggest that 1350 °C was the most optimal post-sintering temperature for the pre-sintered blank.

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“…Associated with high wear and adequate corrosion resistances, medical components were widely produced by conventional techniques, as casting and cold or hot forming followed by posting process (milling and thermal treatments) [2]. AM processes are routes of increasing development which save and waste time, material and costs during parts fabrications.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Biometallic Alloy to Additive Manufacturing Using Selective Laser Melting Technology

Mergulhão¹,

Neves²

2018

JBNB

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Biomaterial powders are in high development due to expansion of additive manufacturing (AM) processes. Selective laser melting (SLM) is a particular AM technology, which completely melts a powder bed layer by laser beam. Investigations of appropriated physical properties of feedstock (powder alloy) were the aim of this study. Cobalt-chromium-molybdenum (Co-Cr-Mo) alloy was used to overview of gas-atomized powder properties in different granulometric ranges (D1 12 -19 μm, D2 20 -46 μm and D3 76 -106 μm), as their: physical, chemical properties and thermal analysis. SLM manufactured standard tensile specimens of usually granulometric range powder size provided mechanical, chemical and thermal properties of biocompatible Co-Cr-Mo alloy. The physical properties showed that powders in the range of 20 to 50 µm provide a better flow ability and packed density, which are relevant characteristics to SLM processing. Manufacturing by SLM process provided suitable mechanical properties in the health area, as well as, maintained the biocompatible properties of the Co-Cr-Mo alloy.

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Comparison of in vitro biocompatibility of a Co–Cr dental alloy produced by new milling/post-sintering or traditional casting technique

Cited by 26 publications

References 15 publications

Perspective of Additive Manufacturing Selective Laser Melting in Co-Cr-Mo Alloy in the Consolidation of Dental Prosthesis

Perspective of Additive Manufacturing Selective Laser Melting in Co-Cr-Mo Alloy in the Consolidation of Dental Prosthesis

Effect of Different Post-Sintering Temperatures on the Microstructures and Mechanical Properties of a Pre-Sintered Co–Cr Alloy

Characteristics of Biometallic Alloy to Additive Manufacturing Using Selective Laser Melting Technology

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