The use of recycled metal in dentistry: Evaluation of mechanical properties of titanium waste recasting

Bauer, José; Cella, Suelen; Pinto, Marcos Franke; Costa, José Ferreira; Reis, Alessandra; Loguércio, Alessandro Dourado

doi:10.1016/j.resconrec.2010.05.008

Cited by 18 publications

(17 citation statements)

References 24 publications

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“…In dental prosthetics, Ni-Cr [4] and Co-Cr [7] alloys [1], as well as gold-based alloys [8] re-use seems to be promising. However, literature data [4,9,10] indicate that many properties of the recast alloy may differ from the new alloy that was purchased from the manufacturer. These differences may involve chemical composition of alloy [10], castability [4] and mechanical properties [5].…”

Section: Introductionmentioning

confidence: 99%

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Effect of addition of recast materials on characteristics of Ni-Cr-Mo alloys

Walczak

Drozd

Caban

2019

Current Issues in Pharmacy and Medical Sciences

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The purpose of this study was to assess the effect on selected mechanical properties, of adding recast materials to the NiCrMo alloy of newly produced castings. Three groups of dental alloy NiCrMo (trade named Remanium CS+) were prepared by mixing 50% new alloy to alloy remnants from previous castings. The specimens in the first casting group used 100% new alloy and served as control (C1). The second group consisted of equal amounts of new alloy and alloy remnants cast only once (C2). The third group contained 50% of new alloy and alloy cast twice (C3). Microstructural analysis was performed and the chemical composition, hardness and the metal-ceramic bond strength were assessed. In addition, EDS analysis (mapping) was undertaken. Hardness and bond strength results were also statistically analysed. In spite of the fact that recasting brought about small changes in hardness and chemical composition (C, Cr and Mo), these effects were found to not affect their functional properties in the oral cavity. Still, significant differences between new alloy and the recasted groups (p < 0.05) were demonstrated in the course of statistical analysis of Vickers hardness test (for α = 0.05). All analysed research groups have a similar average adhesion at 48.51÷49.24 MPa (p > 0.05). The recasting procedure described in the paper can be done safely in dentistry. If previously casted material is used, it should be mixed with new material. The use of the material prepared in this way can lower the costs of NiCrMo castings.

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Section: Introductionmentioning

confidence: 99%

“…These changes largely concern alloy hardness and tensile strength. According to some authors [9,11], these properties may increase or decrease [5,12]. However, researches conducted by Palaskar et al [4] demonstrate that recasts do no engender statistically significant change in the castabilities of recast alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of addition of recast materials on characteristics of Ni-Cr-Mo alloys

Walczak

Drozd

Caban

2019

Current Issues in Pharmacy and Medical Sciences

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“…Titanium alloys are extensively used in critical applications such as biomedical and aerospace applications due to their attractive combination of high strength, low density, and good corrosion resistance [1][2]. For titanium alloys to be used in applications where wear resistance is largely concerned, such as orthopedic prostheses, sufficient wear resistance is required [3]. However, titanium alloys are well known to possess disreputable poor wear property [4][5].…”

Section: Introductionmentioning

confidence: 99%

Wear Analysis of a Ti-5Al-3V-2.5Fe Alloy Using a Factorial Design Approach and Fractal Geometry

El-Morsy

2018

Eng. Technol. Appl. Sci. Res.

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This paper describes the application of the full factorial experimental design technique to confirm the significance of the factors affecting the wear behavior of a recycled Ti-5Al-3V-2.5Fe alloy with a minimum number of experiments. The fractal theory has been used to describe the worn surface state and to investigate the relationship between the fractal dimensions and the surface morphology. The experiments of the sliding wear have been performed under stresses in the range of 1-5 MPa and within sliding velocities range of 0.2–2.0 m/s. Morphology of the worn surfaces investigations has been undertaken using a scanning electron microscope. From the analysis of variance and the nonlinear regression model, the results show that the applied stress has a higher contribution to the wear rate than the sliding velocity.

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“…Hence, dentistry must contribute by reusing the excess alloys such as sprues and buttons in the rehabilitation of oral tooth structure. [ 1 2 ]…”

Section: Introductionmentioning

confidence: 99%

Effect of recasting on element release from base metal dental casting alloys in artificial saliva and saline solution

Jayaprakash

Shetty

et al. 2017

J Conserv Dent

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Aim:The aim of this study was to quantitatively estimate the concentration of ion release from recasted base metal alloys in various pH conditions using atomic absorption spectroscopy (AAS).Materials and Methods:Specimens of commercially available dental casting alloys (cobalt [Co]-chromium [Cr] and nickel [Ni]- chromium [Cr]) were prepared using lost-wax casting techniques and were stored in the test solution for 1 week and 4 weeks, and ions released during chemical corrosion were detected using AAS.Results:An increase in the quantity of ion release was observed with recasting. These changes were higher after twice recasting in Ni-Cr alloy.

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The use of recycled metal in dentistry: Evaluation of mechanical properties of titanium waste recasting

Cited by 18 publications

References 24 publications

Effect of addition of recast materials on characteristics of Ni-Cr-Mo alloys

Effect of addition of recast materials on characteristics of Ni-Cr-Mo alloys

Wear Analysis of a Ti-5Al-3V-2.5Fe Alloy Using a Factorial Design Approach and Fractal Geometry

Effect of recasting on element release from base metal dental casting alloys in artificial saliva and saline solution

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