Correlative microscopy analysis of surface topography in machining Ti-6Al-7Nb

Horovistiz, A.L.; Carvalho, Sílvia; Festas, António; Davim, J. Paulo

doi:10.1016/j.procir.2020.05.098

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…The clinical success of oral implants is related to their osseointegration, a process in which osteoprogenitors/stem cells are involved [ 32 , 33 ]. The osseointegration process is strictly related to the characteristics of implant material, including geometry and surface topography [ 34 , 35 , 36 ]. In this regard, the sandblasting procedures relying on the use of resorbable or non-resorbable blasting media allow one to obtain different levels of surface roughness affecting the micro- and nanotopography profile of dental implants [ 37 ].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Antimicrobial Effect of Air-Polishing Treatments and Their Influence on Human Dental Pulp Stem Cells Seeded on Titanium Disks

Tinco

Bertani

Pisciotta

et al. 2021

IJMS

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Dental implants are one of the most frequently used treatment options for tooth replacement, and titanium is the metal of choice due to its demonstrated superiority in resisting corrosion, lack of allergic reactions and mechanical strength. Surface roughness of titanium implants favors the osseointegration process; nevertheless, its topography may provide a suitable substrate for bacterial biofilm deposition, causing peri-implantitis and leading to implant failure. Subgingival prophylaxis treatments with cleansing powders aimed to remove the bacterial accumulation are under investigation. Two different air-polishing powders—glycine and tagatose—were assayed for their cleaning and antimicrobial potential against a Pseudomonas biofilm and for their effects on human dental pulp stem cells (hDPSCs), seeded on sandblasted titanium disks. Immunofluorescence analyses were carried out to evaluate cell adhesion, proliferation, stemness and osteogenic differentiation. The results demonstrate that both the powders have a great in vitro cleaning potential in the early period and do not show any negative effects during hDPSCs osteogenic differentiation process, suggesting their suitability for enhancing the biocompatibility of titanium implants. Our data suggest that the evaluated cleansing systems reduce microbial contamination and allow us to propose tagatose as an adequate alternative to the gold standard glycine for the air-polishing prophylaxis treatment.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Antimicrobial Effect of Air-Polishing Treatments and Their Influence on Human Dental Pulp Stem Cells Seeded on Titanium Disks

Tinco

Bertani

Pisciotta

et al. 2021

IJMS

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“…The results presented in plots of Fig. 7 correspond to the combination of information obtained from several microstructures, collected in different fields of each sample in order to compensate for biased sampling [20].…”

Section: Surface Topography Analysis: Correlative Microscopy Analysismentioning

confidence: 99%

“…The association of scanning electron microscope (SEM) [18] with the optical microscopy (OM) [19] have been proposed for evaluation of microstructures in terms of a large range of surface properties [17]. This technique has been recently successfully for inspection of the machined surface of Ti-6Al-7Nb samples [20].…”

Section: Introductionmentioning

confidence: 99%

Surface topography in machining Ti alloys for biomedical applications: correlative microscopy approach for qualitative and quantitative analysis

Carvalho

Horovistiz

Davim

2021

Int J Adv Manuf Technol

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V-Free Ti-6Al-7Nb alloy may be an interesting candidate as a substitute to the traditional Ti-6Al-4V alloy on development of biomedical components. The inspection of surface integrity through digital microscopy techniques shows strong potential for comparative analysis and optimization of manufacturing processes. This work deals with the comparative analysis of turned surfaces of dual-phase (α+β) titanium alloys: Ti-6Al-4V and Ti-6Al-7Nb, under different cutting conditions. Digital image processing and analysis technique has been used to evaluate the volume fraction of phases and their distribution. An innovative methodology for digitizing the surface topography was applied, based on the association of modern microscopy techniques with digital image processing-Correlative Microscopy. The global outcomes show that Ti-6Al-4V samples presented better homogeneity, with a mean β volume fraction of about 17%, compared to 11% of Ti-6Al-7Nb samples. Combination of higher feed rate and lower velocity produce rougher topography for both alloys, while the topographic formation obtained by the combination of lower feed rate and higher velocity seems smoother. In addition, Ti-6Al-4V alloy presents rougher topography in comparison topography of Ti-6Al-7Nb, under all conditions, probably due to the different phase distribution. The correlative microscopy allowed a correspondence between the cutting conditions and the microstructural properties of the both Ti-6Al-4V and Ti-6Al-7Nb alloys, through the analysis of the machined surface.

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“…Recently the technique of correlative microscopy 23 was developed for the inspection of machined surfaces of Ti alloys. This technique provides a wide range of information on the topography patterns generated by the different machining parameters eventually associated with microstructural modifications.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of titanium alloys machinability used for medical applications

Festas

Carvalho

Horovistiz

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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CNC machining manufacturing is critical to the development of biomedical industries, especially orthopaedic implants. Understanding a material's machinability under different cutting conditions is essential for component design as well as for optimizing the machining process. Despite their widespread use in the biomedical industry, α + β-type titanium (Ti) alloys, such as Ti-6Al-4V and Ti-6Al-7Nb, are being replaced by β or near β-type Ti alloys like Ti-13Nb-13Zr Ti alloy due to issues associated with Vanadium and Aluminium toxicity and lower modulus of elasticity. By simulating the machining of a functional cone of the hip prosthesis femoral component, this work aims to investigate some aspects of the machinability of titanium alloys: Ti-6Al-4V, Ti-6Al-7Nb, and Ti-13Nb-alloy 13Zr. Cutting forces values were registered during the tests. Using correlative microscopy, machined surfaces were examined by measuring roughness and topographic examination. According to the results obtained, the new titanium alloy Ti-13Nb-13Zr alloy presents lower cutting forces and a worse surface finish for a lower feed rate. However, when the feed rate was increased to double the initial value, this alloy had the smallest increase in Ra, compared with the other alloys under test The effect of federate is highly significant in cutting forces and surface finish, with increases in cutting forces of 35%, 45% and 66% on cutting forces for Ti-13Nb-13Zr, Ti-6Al-4V and Ti-6Al-7Nb, respectively.

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Correlative microscopy analysis of surface topography in machining Ti-6Al-7Nb

Cited by 5 publications

References 10 publications

Evaluation of Antimicrobial Effect of Air-Polishing Treatments and Their Influence on Human Dental Pulp Stem Cells Seeded on Titanium Disks

Evaluation of Antimicrobial Effect of Air-Polishing Treatments and Their Influence on Human Dental Pulp Stem Cells Seeded on Titanium Disks

Surface topography in machining Ti alloys for biomedical applications: correlative microscopy approach for qualitative and quantitative analysis

Comparative study of titanium alloys machinability used for medical applications

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