Microstructure, hardness, corrosion resistance and porcelain shear bond strength comparison between cast and hot pressed CoCrMo alloy for metal–ceramic dental restorations

Henriques, Bruno; Soares, Delfim; Silva, Filipe

doi:10.1016/j.jmbbm.2012.03.015

Cited by 74 publications

(38 citation statements)

References 38 publications

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“…The alternating stresses can lead to delamination at the interface between metal and ceramic (or between the several composite layers) when a good bonding between the materials is not verifyed. Relative to this point, and concerning the base materials and composites involved in this study, good bond strengths were resported elsewhere based on experiemental works (Henriques et al 2012a(Henriques et al , 2012b(Henriques et al , 2012c(Henriques et al , 2012d(Henriques et al , 2013. Ravichandran (1995) also noticed a decrease in the residual stress levels with an increasing number of layers, which is in accordance to results obtained in this study.…”

Section: Discussionmentioning

confidence: 62%

Finite element analysis of the residual thermal stresses on functionally gradated dental restorations

Henriques

Miranda

Gasik

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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The aim of this work was to study, using the finite element method (FEM), the distribution of thermal residual stresses arising in metal-ceramic dental restorations after cooling from the processing temperature. Three different interface configurations were studied: with conventional sharp transition; one with a 50% metal-50% ceramic interlayer; and one with a compositionally functionally gradated material (FGM) interlayer. The FE analysis was performed based on experimental data obtained from Dynamic Mechanical Analysis (DMA) and Dilatometry (DIL) studies of the monolithic materials and metal/ceramic composites. Results have shown significant benefits of using the 50% metal-50% ceramic interlayer and the FGM interlayer over the conventional sharp transition interface configuration in reduction of the thermal residual stress and improvement of stress profiles. Maximum stresses magnitudes were reduced by 10% for the crowns with 50% metal-50% ceramic interlayer and by 20% with FGM interlayer. The reduction in stress magnitude and smoothness of the stress distribution profile due to the gradated architectures might explain the improved behavior of these novel dental restorative systems relative to the conventional one, demonstrated by in-vitro studies already reported in literature.

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Section: Discussionmentioning

confidence: 62%

Finite element analysis of the residual thermal stresses on functionally gradated dental restorations

Henriques

Miranda

Gasik

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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“…On the other hand, it can significantly influence other mechanical properties of the samples, such as tensile and rupture strength, but that issue was not assessed in this study. The hot pressing technique is known for producing fully dense parts [20][21][22][23][24][25][26] and the results reflect well this feature of the process.…”

Section: Microstructurementioning

confidence: 78%

On the hot pressing of coloured high-gold alloys powder compacts applied to the manufacturing of innovative jewellery items

et al. 2013

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Innovative design through colour has always been a very important feature in decorative items, jewellery inclusive. The use of coloured gold alloys (e.g. red, white, green) in the manufacture of jewellery artifacts is nowadays generalized, and one can often see jewellery items that combine more than a single colour. However, multicoloured jewellery artifacts are generally made of parts produced separately and bonded together in a later step. The ability to produce jewellery sub-components or final pieces using a powder metallurgy process aimed at producing innovative multi-coloured gold jewellery items with colour gradients is explored in this paper. Four 19.2 ct coloured gold powders (yellow, green, red and white) were hot pressed at different times and temperatures and the resulting samples were analyzed in terms of their microstructure, hardness, porosity, microstructure and optical properties. A manufacturing route to obtain multi-coloured jewellery pieces with colour gradients is also presented.

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“…Precipitates in the structure of alloys are the main factor affecting mechanical and corrosive properties, so in the literature the morphology and type of precipitates in biomedical cobalt alloys is an important and still valid topic [2,7,18].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterisation of Co-Cr-Mo Casting Dental Alloys

Szala¹,

Beer–Lech²,

Gancarczyk³

et al. 2017

Adv. Sci. Technol. Res. J.

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The study compares the microstructure of three commercial dental cobalt matrix alloys with related chemical composition declared by the manufacturer. Casts were produced with lost wax method, then melted and casted with centrifugal induction casting machine. The Co-Cr-Mo alloys were casted according to the manufacturers procedure. The samples' chemical composition and phase composition, respectively, using WD-XRF (Wavelength Dispersive X-Ray Fluorescence) and XRD (X-ray Diffarction) methods were analysed. Casts microstructure by mean of LOM (Light Optical Microscopy), SEM (Scanning Electron Microscopy) and EDS (Energy Dispersive X-ray Spectroscopy) were investigated. Vickers hardness HV10 was measured. Quantitative microstructure evaluation was performed by means of computer image processing. The results of the chemical composition indicate the high stability of the chemical composition for alloy A. In case of alloys B and C, there was a significant difference in carbon content. Quantitative differences in image of microstructure between of castings A and B, C were noticed. The greater amount of precipitates was recorded for castings with higher carbon content. In all investigated castings, the presence of β matrix solution and M23C6 carbide precipitations was found.

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Microstructure, hardness, corrosion resistance and porcelain shear bond strength comparison between cast and hot pressed CoCrMo alloy for metal–ceramic dental restorations

Cited by 74 publications

References 38 publications

Finite element analysis of the residual thermal stresses on functionally gradated dental restorations

Finite element analysis of the residual thermal stresses on functionally gradated dental restorations

On the hot pressing of coloured high-gold alloys powder compacts applied to the manufacturing of innovative jewellery items

Microstructural Characterisation of Co-Cr-Mo Casting Dental Alloys

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