Base de dados : MEDLINE
Pesquisa : D01.220.175.950 [Categoria DeCS]
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[PMID]:28869636
[Au] Autor:Dobruchowska E; Paziewska M; Przybyl K; Reszka K
[Ad] Endereço:Koszalin University of Technology, Faculty of Technology and Education, Koszalin, Poland.
[Ti] Título:Structure and corrosion resistance of Co-Cr-Mo alloy used in Birmingham Hip Resurfacing system.
[So] Source:Acta Bioeng Biomech;19(2):31-39, 2017.
[Is] ISSN:1509-409X
[Cp] País de publicação:Poland
[La] Idioma:eng
[Ab] Resumo:PURPOSE: The endoprostheses made of cobalt-chromium-molybdenum (Co-Cr-Mo) alloys belong to the group of the most popular metallic implants used for reconstruction of hip joints. For such biomaterials, the primary goal is a correct and long-term functioning in the aggressive environment of body fluids. Therefore, the purpose of this study was to examine both the morphology and the corrosion resistance of implants made of the cobalt alloy used in Birmingham Hip Resurfacing (BHR) system (Smith & Nephew). For comparative purposes, the electrochemical studies were done for the nitrided stainless steel - Orthinox. METHODS: Observations of the microstructure of the material under investigation were performed by means of the optical metallographic microscope and the scanning electron microscope. Furthermore, Energy Dispersive X-ray Spectroscopy was used to analyse the chemical composition of the endoprosthesis. Characterisation and evaluation of electrochemical corrosion resistance of the selected alloys were performed by potentiodynamic polarisation tests. RESULTS: The structural studies confirmed that Co-Cr-Mo (BHR system) is characterised by a typical dendritic microstructure with carbide precipitates, mainly M23C6, within the interdendritic areas. The results of the polarisation measurements showed that the cobalt alloy investigated exhibits lower corrosion potential than Orthinox in the utilised environments (3% NaCl, simulated body fluid - Hank's Body Fluid). CONCLUSIONS: However, the high passivation ability of the Co-Cr-Mo alloy, as well as its resistance to the initiation and propagation of localised corrosion processes, indicate that this material is significantly more appropriate for long-term implants.
[Mh] Termos MeSH primário: Materiais Biocompatíveis/química
Prótese de Quadril
Vitálio/química
[Mh] Termos MeSH secundário: Materiais Biocompatíveis/análise
Corrosão
Análise de Falha de Equipamento
Teste de Materiais
Oxirredução
Desenho de Prótese
Propriedades de Superfície
Vitálio/análise
[Pt] Tipo de publicação:EVALUATION STUDIES; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Biocompatible Materials); 12629-02-6 (Vitallium)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171109
[Lr] Data última revisão:
171109
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170905
[St] Status:MEDLINE


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[PMID]:28415428
[Au] Autor:Cassar J; Mallia B; Karl A; Buhagiar J
[Ad] Endereço:Department of Metallurgy and Materials Engineering, University of Malta, Msida, MSD2080, Malta.
[Ti] Título:The effect of sliding onto the metal-electrolyte interface: Studying model parameter modifications by means of EIS.
[So] Source:Mater Sci Eng C Mater Biol Appl;75:1366-1375, 2017 Jun 01.
[Is] ISSN:1873-0191
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Several problems are associated with corrosion-wear occurring on metal-on-metal hip implants made out of cobalt-chromium based alloys. Low temperature carburizing, a process that creates a hard and corrosion resistant diffused layer in Cobalt-Chromium-Molybdenum (CoCrMo) alloys, known as S-phase, may be a possible solution towards mitigating these problems. In this work, static- and tribo-corrosion testing involving an alumina versus CoCrMo (untreated and carburized) were conducted in Ringer's solution. Electrochemical impedance spectroscopy was used to compare impedance plots attained before and after sliding so as to understand how the metal-electrolyte interface is affected by rubbing. Both untreated and carburized CoCrMo experienced extensive reduction in corrosion resistance following sliding wear damage such that one should expect a considerably deteriorated performance of both surfaces in a tribocorrosion application. The structure of the interface was relatively unaffected after sliding at the equilibrium and passive potentials. This implies that the layers making up the interface before sliding were still present after sliding. However, their properties changed - the interface's real resistance dropped while its capacitance increased. The former was linked to a weaker, damaged passive film while the latter was linked to accumulation of wear debris and corrosion products.
[Mh] Termos MeSH primário: Prótese de Quadril
Vitálio/química
[Mh] Termos MeSH secundário: Corrosão
Espectroscopia Dielétrica
Eletrólitos/química
Seres Humanos
Propriedades de Superfície
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Electrolytes); 12629-02-6 (Vitallium)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170724
[Lr] Data última revisão:
170724
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170419
[St] Status:MEDLINE


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[PMID]:27862223
[Au] Autor:Aljenaei F; Catelas I; Louati H; Beaulé PE; Nganbe M
[Ad] Endereço:Department of Mechanical Engineering, University of Ottawa, Ottawa, Ontario, Canada.
[Ti] Título:Effects of hip implant modular neck material and assembly method on fatigue life and distraction force.
[So] Source:J Orthop Res;35(9):2023-2030, 2017 Sep.
[Is] ISSN:1554-527X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Hip implant neck fractures and adverse tissue reactions associated with fretting-corrosion damage at modular interfaces are a major source of concern. Therefore, there is an urgent clinical need to develop accurate in vitro test procedures to better understand, predict and prevent in vivo implant failures. This study aimed to simulate in vivo fatigue fracture and distraction of modular necks in an in vitro setting, and to assess the effects of neck material (Ti6Al4V vs. CoCrMo) and assembly method (hand vs. impact) on the fatigue life and distraction of the necks. Fatigue tests were performed on the cementless PROFEMUR® Total Hip Modular Neck System under two different loads and number of cycles: 2.3 kN for 5 million cycles, and 7.0 kN for 1.3 million cycles. The developed in vitro simulation setup successfully reproduced in vivo modular neck fracture mode and location. Neck failure occurred at the neck-stem taper and the fracture ran from the distal lateral neck surface to the proximal medial entry point of the neck into the stem. None of the necks failed under the 2.3 kN load. However, all hand-assembled Ti6Al4V necks failed under the 7.0 kN load. In contrast, none of the hand-assembled CoCrMo necks and impact-assembled necks (Ti6Al4V or CoCrMo) failed under this higher load. In conclusion, Ti6Al4V necks were more susceptible to fatigue failure than CoCrMo necks. In addition, impact assembly substantially improved the fatigue life of Ti6Al4V necks and also led to overall higher distraction forces for both neck materials. Overall, this study shows that the material and assembly method can affect the fatigue strength of modular necks. Finally, improper implant assembly during surgery may result in diminished modular neck survivability and increased failure rates. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:2023-2030, 2017.
[Mh] Termos MeSH primário: Prótese de Quadril
Titânio
Vitálio
[Mh] Termos MeSH secundário: Teste de Materiais
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
12629-02-6 (Vitallium); 12743-70-3 (titanium alloy (TiAl6V4)); D1JT611TNE (Titanium)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171010
[Lr] Data última revisão:
171010
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161119
[St] Status:MEDLINE
[do] DOI:10.1002/jor.23481


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[PMID]:27636767
[Au] Autor:Parunov VA; Yurkovetz PV; Lebedenko IY
[Ad] Endereço:Central Research Institute of Dentistry and Maxillofacial Surgery, Moscow, Russia.
[Ti] Título:Technological features of metal-ceramic prosthesis frameworks manufactured from domestic alloys of precious and base metals.
[Ti] Título:Tekhnologicheskie osobennosti izgotovleniya litykh karkasov metallokeramicheskikh zubnykh protezov iz otechestvennykh splavov blagorodnykh i neblagorodnykh metallov..
[So] Source:Stomatologiia (Mosk);95(4):71-75, 2016.
[Is] ISSN:0039-1735
[Cp] País de publicação:Russia (Federation)
[La] Idioma:rus
[Ab] Resumo:The aim of the study was to examine changes in physical and mechanical properties of dental alloys depending of the initial composition at re-casting. Russianc precious alloys: Plagodent (AuPtPd) and Palladent (PdAu) and base alloys: Vitiriy-N (NiCrMo) and Vitiriy-C (CoCrMo) were used as study samples, which were divided in three groups: a primary casting from the granules; 50% of re-casting; 100% of re-casting. We investigated the yield strength in bending, coefficient of thermal expansion and hardness. Changing in the composition of the alloys has led to changes of all physical and mechanical properties.
[Mh] Termos MeSH primário: Coroas
Prótese Parcial Fixa
Ligas Metalo-Cerâmicas/química
[Mh] Termos MeSH secundário: Ligas de Cromo/química
Ligas de Ouro/química
Seres Humanos
Paládio/química
Platina/química
Vitálio/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Chromium Alloys); 0 (Gold Alloys); 0 (Metal Ceramic Alloys); 12629-02-6 (Vitallium); 49DFR088MY (Platinum); 5TWQ1V240M (Palladium)
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170621
[Lr] Data última revisão:
170621
[Sb] Subgrupo de revista:D; IM
[Da] Data de entrada para processamento:160917
[St] Status:MEDLINE
[do] DOI:10.17116/stomat201695471-75


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[PMID]:27609379
[Au] Autor:Hou YF; Bian HQ; Zhang L; Sun Z
[Ad] Endereço:Hefei Stomatological Hospital. Hefei 230001, Anhui Province, China. E-mail:hyfedward@163.com.
[Ti] Título:[Analysis of retention of 3 different aesthetic Co-Cr-Mo alloy clasps on premolars].
[So] Source:Shanghai Kou Qiang Yi Xue;25(3):288-91, 2016 Jun.
[Is] ISSN:1006-7248
[Cp] País de publicação:China
[La] Idioma:chi
[Ab] Resumo:PURPOSE: To evaluate the 3-D surface topography of ultrasonically prepared tooth. METHODS: Ten extracted human maxillary premolars were prepared for crowns. A split-tooth model was used to refine the margins: half of the margin was finished with traditional rotary instruments, the other with ultrasonic instruments. The 3-D profiles of the prepared surface were observed under scanning electron microscopy and Talysurf CCI 3000 non-contact 3D profiler, and a quantitative comparison of 3-D surface roughness average(SA) and the surface of skewness(SSK) was conducted with Talymap Gold software. The data were analyzed by independent sample t test using SPSS13.0 software package. RESULTS: The surface finished with ultrasonic instruments exhibited a smoother surface. 3-D surface roughness analysis showed that the SA and SSK of surfaces made by ultrasonic instruments were significantly lower, compared with surfaces produced using conventional rotary instruments. CONCLUSIONS: The ultrasonic instruments produce surface in better condition than the conventional rotary instruments.
[Mh] Termos MeSH primário: Dente Pré-Molar
Grampos Dentários
Estética
Vitálio/química
[Mh] Termos MeSH secundário: Ligas
Coroas
Seres Humanos
Microscopia Eletrônica de Varredura
Propriedades de Superfície
Preparo do Dente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Alloys); 12629-02-6 (Vitallium)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170517
[Lr] Data última revisão:
170517
[Sb] Subgrupo de revista:D; IM
[Da] Data de entrada para processamento:160910
[St] Status:MEDLINE


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[PMID]:27609378
[Au] Autor:Wu XY; Zhong Q
[Ad] Endereço:Shanghai Stomatological Hospital. Shanghai 200031, China. E-mail:15800714355@163.com.
[Ti] Título:[Analysis of retention of 3 different aesthetic Co-Cr-Mo alloy clasps on premolars].
[So] Source:Shanghai Kou Qiang Yi Xue;25(3):284-7, 2016 Jun.
[Is] ISSN:1006-7248
[Cp] País de publicação:China
[La] Idioma:chi
[Ab] Resumo:PURPOSE: To analyze the retention of 3 different Co-Cr-Mo alloy clasps on premolars, and provide information for clinical design of aesthetic clasps. METHODS: An EZ20 force measuring instrument was used to record the retention of Co-Cr-Mo alloy casting aesthetic clasps when they were dislodged from undercuts of different depths (0.25, 0.50, 0.75 mm) on premolars. The data were analyzed with SPSS 22.0 software passage. RESULTS: The clasp retention in groups of 0.25 and 0.5 mm undercut was three-arm clasp > varied Y-shaped clasp > modified RPI clasp. In the group of 0.75 mm undercut, the clasp retention was varied Y-shaped clasp>three-arm clasp>modified RPI clasp after circulations. CONCLUSIONS: A varied Y-shaped bar clasp of 0.75 mm undercut depth is suitable for premolar both for its adequate retention and aesthetic effect.
[Mh] Termos MeSH primário: Grampos Dentários
Retenção de Dentadura
Estética
Vitálio/química
[Mh] Termos MeSH secundário: Dente Pré-Molar
Ligas de Cromo
Ligas Dentárias
Análise do Estresse Dentário
Prótese Parcial Removível
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Chromium Alloys); 0 (Dental Alloys); 12629-02-6 (Vitallium)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170517
[Lr] Data última revisão:
170517
[Sb] Subgrupo de revista:D; IM
[Da] Data de entrada para processamento:160910
[St] Status:MEDLINE


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[PMID]:27484073
[Au] Autor:Ballay R; Landor I; Ruzicka F; Melichercík P; Tomaides J; Jahoda D
[Ad] Endereço:I. ortopedická klinika 1. lékarské fakulty Univerzity Karlovy v Praze a Fakultní nemocnice Motol, Praha.
[Ti] Título:[Alloplastic Materials and their Propensity to Bacterial Colonisation].
[Ti] Título:Aloplastické materiály z pohledu jejich citlivosti ke kolonizaci bakteriemi..
[So] Source:Acta Chir Orthop Traumatol Cech;83(3):163-8, 2016.
[Is] ISSN:0001-5415
[Cp] País de publicação:Czech Republic
[La] Idioma:cze
[Ab] Resumo:UNLABELLED: PURPOSE OF THE STUDY The alloplastic materials currently used for protective surface layers on implants were tested in vitro under microbiological laboratory conditions by contamination with microbial agents most frequently found in deep infection of total joint replacements. The objective was to find out how the resistance to bacterial colonisation was related to different surface finishes. MATERIAL AND METHODS Each of 14 samples of alloplastic material currently used in the manufacture of orthopaedic implants was inoculated with each of the group of microorganisms most frequently infecting joint replacements; these were Staphylococcus aureus, Staphylococcus epidermidis, Pseudomonas aeruginosa, Enterococcus faecalis and Escherichia coli. At 24 hours of incubation, biofilms produced on sample surfaces were collected, stained with crystalline violet and assessed by spectrophotometry. The average value of biofilm absorbances (AV595) for the group of microorganism tested was taken as a basic characteristic of each material sample indicating its sensitivity to bacterial. RESULTS Of the metal materials with smooth surface finish, Vitalium (AV595, 0.368) showed the lowest affinity to microbial colonisation; next was titanium (AV595, 0.459) and steel (AV595, 0.505). A significant increase in sensitivity to bacterial colonisation was recorded in all types of surface finish of steel (AV595, 0.571) and in titanium alloy with a rough surface texture (AV595, 0.737 to 1.676); p < 0.05. Porous titanium surfaces significantly increased material affinity to colonisation. DISCUSSION Our study had certain limitations concerning in vitro evaluation of porous surfaces that have high affinity to bacterial colonisation. Porous titanium, and its hydroxyapatite layer in particular, considerably promotes osteoblast colonisation of the surface as well as implant osseointegration in the bone bed. Microorganisms therefore have no room for surface colonisation. Problematic may remain the surface parts outside contact with bone that keep their affinity to bacterial colonisation. CONCLUSIONS The material of choice for cemented implants is Vitalium which, of all metal surfaces, has the lowest sensitivity to bacterial colonisation. The materials of choice for cementless implants are titanium alloys. However, an osteoactive surface not in contact with bone remains a problem. On the one hand, its roughness and porosity are crucial to good osseointegration, on the other hand, its affinity to bacterial colonisation is high. KEY WORDS: alloplastic material, biofilm, joint replacement infection.
[Mh] Termos MeSH primário: Artroplastia de Substituição/instrumentação
Materiais Biocompatíveis/química
Biofilmes/crescimento & desenvolvimento
Próteses e Implantes/efeitos adversos
Infecções Relacionadas à Prótese/microbiologia
[Mh] Termos MeSH secundário: Materiais Biocompatíveis/efeitos adversos
Enterococcus faecalis/fisiologia
Escherichia coli/fisiologia
Seres Humanos
Teste de Materiais
Pseudomonas aeruginosa/fisiologia
Staphylococcus aureus/fisiologia
Staphylococcus epidermidis/fisiologia
Propriedades de Superfície
Titânio/química
Vitálio/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Biocompatible Materials); 12629-02-6 (Vitallium); D1JT611TNE (Titanium)
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170221
[Lr] Data última revisão:
170221
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160804
[St] Status:MEDLINE


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[PMID]:27338511
[Au] Autor:Bergschmidt P; Ellenrieder M; Bader R; Kluess D; Finze S; Schwemmer B; Mittelmeier W
[Ad] Endereço:Department of Traumatology, Orthopaedics and Hand Surgery, Klinikum Südstadt Rostock, Südring 81, 18059 Rostock, Germany; Department of Orthopaedics, University Medicine Rostock, Doberaner Strasse 142, 18057 Rostock, Germany. Electronic address: philipp.bergschmidt@kliniksued-rostock.de.
[Ti] Título:Prospective comparative clinical study of ceramic and metallic femoral components for total knee arthroplasty over a five-year follow-up period.
[So] Source:Knee;23(5):871-6, 2016 Oct.
[Is] ISSN:1873-5800
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The aim of this prospective comparative study was to evaluate the clinical and radiological outcomes of a TKA system, comparing a ceramic (BIOLOX® delta) and metallic (Co28Cr6Mo) femoral component over a five-year follow-up period. METHODS: Forty-three TKA patients (17 metallic and 26 ceramic femoral components) were enrolled in the study. Clinical and radiological evaluations were performed preoperatively and at three, 12, 24 and 60months postoperatively, using the HSS-, WOMAC- and SF36-Scores, in addition to standardized X-rays. RESULTS: The HSS-Score improved significantly from 58.7±12.7 points preoperatively to 88.5±12.3 points at five-years postoperative in the ceramic group, and 60.8±7.7 to 86.2±9.4 points in the metallic group. WOMAC- and SF-36-Scores showed significant improvement over time in both groups. There were no significant differences between groups for HSS-, WOMAC- and SF-36-Scores, nor for range of motion (p≤0.897) at any follow-up evaluation. Furthermore, radiological evaluation showed no implant loosening or migration in either group. CONCLUSIONS: Mid-term outcomes for the ceramic femoral components demonstrated good clinical and radiological results, as well as comparable survivorship to the metallic femoral component of the same total knee system, and to other commonly used metallic total knee systems. Therefore, ceramic knee implants may be a promising solution for the population of patients with osteoarthritis and metal sensitivity. Long-term studies are required in order to confirm the positive mid-term clinical results, and to follow the implant survival rate in regard to the enhanced wear resistance of ceramic implants.
[Mh] Termos MeSH primário: Artroplastia do Joelho/instrumentação
Fêmur/cirurgia
Articulação do Joelho/cirurgia
Prótese do Joelho
Osteoartrite do Joelho/cirurgia
[Mh] Termos MeSH secundário: Adulto
Idoso
Materiais Biocompatíveis
Cerâmica
Feminino
Seguimentos
Seres Humanos
Masculino
Meia-Idade
Estudos Prospectivos
Desenho de Prótese
Falha de Prótese
Vitálio
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Biocompatible Materials); 12629-02-6 (Vitallium)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170921
[Lr] Data última revisão:
170921
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160625
[St] Status:MEDLINE


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[PMID]:27170535
[Au] Autor:Haschke H; Jauch-Matt SY; Sellenschloh K; Huber G; Morlock MM
[Ad] Endereço:Institute of Biomechanics, Hamburg University of Technology (TUHH), Hamburg, Germany haschke@tuhh.de.
[Ti] Título:Assembly force and taper angle difference influence the relative motion at the stem-neck interface of bi-modular hip prostheses.
[So] Source:Proc Inst Mech Eng H;230(7):690-9, 2016 Jul.
[Is] ISSN:2041-3033
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Bi-modular hip arthroplasty prostheses allow adaptation to the individual patient anatomy and the combination of different materials but introduce an additional interface, which was related lately to current clinical issues. Relative motion at the additional taper interface might increase the overall risk of fretting, corrosion, metallic debris and early failure. The aim of this study was to investigate whether the assembly force influences the relative motion and seating behaviour at the stem-neck interface of a bi-modular hip prosthesis (Metha(®); Aesculap AG, Tuttlingen, Germany) and whether this relation is influenced by the taper angle difference between male and female taper angles. Neck adapters made of titanium (Ti6Al4V) and CoCr (CoCr29Mo) were assembled with a titanium stem using varying assembly forces and mechanically loaded. A contactless eddy current measurement system was used to record the relative motion between prosthesis stem and neck adapter. Higher relative motion was observed for Ti neck adapters compared to the CoCr ones (p < 0.001). Higher assembly forces caused increased seating distances (p < 0.001) and led to significantly reduced relative motion (p = 0.019). Independent of neck material type, prostheses with larger taper angle difference between male and female taper angles exhibited decreased relative motion (p < 0.001). Surgeons should carefully use assembly forces above 4 kN to decrease the amount of relative motion within the taper interface. Maximum assembly forces, however, should be limited to prevent periprosthetic fractures. Manufacturers should optimize taper angle differences to increase the resistance against relative motion.
[Mh] Termos MeSH primário: Prótese de Quadril
[Mh] Termos MeSH secundário: Artroplastia de Quadril/efeitos adversos
Artroplastia de Quadril/métodos
Fenômenos Biomecânicos
Seres Humanos
Teste de Materiais
Movimento (Física)
Desenho de Prótese
Falha de Prótese
Estresse Mecânico
Titânio
Vitálio
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
12629-02-6 (Vitallium); 12743-70-3 (titanium alloy (TiAl6V4)); D1JT611TNE (Titanium)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170410
[Lr] Data última revisão:
170410
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160513
[St] Status:MEDLINE
[do] DOI:10.1177/0954411916648717


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[PMID]:26952452
[Au] Autor:Pettersson M; Bryant M; Schmidt S; Engqvist H; Hall RM; Neville A; Persson C
[Ad] Endereço:Materials in Medicine Group, Div. of Applied Materials Science, Dept. of Engineering Sciences, Uppsala University, Uppsala, Sweden.
[Ti] Título:Dissolution behaviour of silicon nitride coatings for joint replacements.
[So] Source:Mater Sci Eng C Mater Biol Appl;62:497-505, 2016 May.
[Is] ISSN:1873-0191
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:In this study, the dissolution rate of SiNx coatings was investigated as a function of coating composition, in comparison to a cobalt chromium molybdenum alloy (CoCrMo) reference. SiNx coatings with N/Si ratios of 0.3, 0.8 and 1.1 were investigated. Electrochemical measurements were complemented with solution (inductively coupled plasma techniques) and surface analysis (vertical scanning interferometry and x-ray photoelectron spectroscopy). The dissolution rate of the SiNx coatings was evaluated to 0.2-1.4 nm/day, with a trend of lower dissolution rate with higher N/Si atomic ratio in the coating. The dissolution rates of the coatings were similar to or lower than that of CoCrMo (0.7-1.2 nm/day). The highest nitrogen containing coating showed mainly Si-N bonds in the bulk as well as at the surface and in the dissolution area. The lower nitrogen containing coatings showed Si-N and/or Si-Si bonds in the bulk and an increased formation of Si-O bonds at the surface as well as in the dissolution area. The SiNx coatings reduced the metal ion release from the substrate. The possibility to tune the dissolution rate and the ability to prevent release of metal ions encourage further studies on SiNx coatings for joint replacements.
[Mh] Termos MeSH primário: Substitutos Ósseos/química
Materiais Revestidos Biocompatíveis/química
Compostos de Silício/química
[Mh] Termos MeSH secundário: Artroplastia do Joelho
Substitutos Ósseos/metabolismo
Materiais Revestidos Biocompatíveis/metabolismo
Corrosão
Técnicas Eletroquímicas
Interferometria
Teste de Materiais
Espectroscopia Fotoeletrônica
Solubilidade
Propriedades de Superfície
Vitálio/química
Vitálio/metabolismo
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Bone Substitutes); 0 (Coated Materials, Biocompatible); 0 (Silicon Compounds); 12033-89-5 (silicon nitride); 12629-02-6 (Vitallium)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160309
[St] Status:MEDLINE



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