Liberação de íons por biomateriais metálicos

Morais, Liliane Siqueira de; Guimarães, Glaucio Serra; Elias, Carlos Nelson

doi:10.1590/s1415-54192007000600006

Cited by 9 publications

(7 citation statements)

References 24 publications

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“…There are evidences that support the deleterious effects of the buccal environment on structural alterations of metallic biomaterials. 23 Eliades et al 6,7 tested orthodontic materials and did not find ion release by nickel-titanium alloys, but observed levels of nickel and chromium released by stainless steel alloys. No material was mentioned as cytotoxic, probably due low quantity of released ions or for the way they link.…”

mentioning

confidence: 98%

Evaluation of ionic degradation and slot corrosion of metallic brackets by the action of different dentifrices

Brandão

Simas²,

Almeida³

et al. 2013

Dental Press J. Orthod.

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How to cite this article: Brandão GAM, Simas RM, Almeida LM, Silva JM, Meneghim MC, Pereira AC, Almeida HA, Brandão AMM. Evaluation of ionic degradation and slot corrosion of metallic brackets by the action of different dentifrices. Dental Press J Orthod. 2013 Jan-Feb;18(1):86-93. » The authors report no commercial, proprietary or financial interest in the products or companies described in this article. Objective: To evaluate the in vitro ionic degradation and slot base corrosion of metallic brackets subjected to brushing with dentifrices, through analysis of chemical composition by Energy Dispersive Spectroscopy (EDS) and qualitative analysis by Scanning Electron Microscopy (SEM).Methods: Thirty eight brackets were selected and randomly divided into four experimental groups (n = 7). Two groups (n = 5) worked as positive and negative controls. Simulated orthodontic braces were assembled using 0.019 x 0.025-in stainless steel wires and elastomeric rings. The groups were divided according to surface treatment: G1 (Máxima Proteção Anticáries introduction Deterioration and corrosion of orthodontic appliances is a concern for orthodontists in their clinical practice. This attention is focused in two main questions: If the corrosion by products, whether they are produced, are absorbed by the organism and can cause local or systematic effects; and which effects the corrosion has on the physical properties and clinical performance of orthodontic appliances. There are evidences that support the deleterious effects of the buccal environment on structural alterations of metallic biomaterials.23 Eliades et al 6,7 tested orthodontic materials and did not find ion release by nickel-titanium alloys, but observed levels of nickel and chromium released by stainless steel alloys. No material was mentioned as cytotoxic, probably due low quantity of released ions or for the way they link.The several appliances (brackets, arch wires, etc.) used during orthodontic treatment to obtain the dental movement are composed of materials with distinct physical integrity, structural compositions and mechanical properties. Their requirements are complex for they are put under many stresses in the oral environment. This includes immersion in saliva and ingested liquids, temperature variation, mastication efforts and the loading submitted to the appliances. The combination of these materials and hostile conditions provided by the environment can result in corrosion, ion release and deterioration of these appliances. The interactions that these corrosion by products can have on the manifestation of local or systematic problems in the individual's health is not well corroborated and comprehended in literature, 3,4,11 despite numerous case reports of hypersensitivity to nickel 13,21 and alterations on the ionic concentration of body fluids.

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mentioning

confidence: 98%

Evaluation of ionic degradation and slot corrosion of metallic brackets by the action of different dentifrices

Brandão

Simas²,

Almeida³

et al. 2013

Dental Press J. Orthod.

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“…Biomaterial é qualquer material sintético que substitui ou restaura a função de tecidos do corpo e que mantém contato contínuo ou intermitente com os fluídos. (MORAIS, 2007). Segundo Callister.…”

Section: Biomateriaisunclassified

“…As reações biológicas acontecem pela interação do íon liberado com uma molécula do hospedeiro, sendo a composição da liga de fundamental importância. Os efeitos causados no organismo aparecem devido à influência do íon sobre os mecanismos de adesão bacteriana, por toxicidade, efeitos subtóxicos ou alergia aos íons metálicos liberados (MORAIS, 2007).…”

Section: Corrosãounclassified

A Influência Do Nitrogênio Em Aços Inoxidáveis Austeníticos Com Aplicação Em Próteses Ortopédicas

Cerqueira¹,

Júnior²

2019

As Engenharias Frente a Sociedade, a Economia E O Meio Ambiente 3

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“…Every implanted metal biomaterial has some interaction with surrounding tissues, by occurring release of ions by dissolution, wear or corrosion. The intra-oral corrosion is considered to be a complex process which depends on composition and thermomechanical alloy state, in combination with manufacturing, surface finishing, mechanical aspects, environment and host systemic state [1,2].…”

Section: Introductionmentioning

confidence: 99%

Corrosion of Ni-Cr-Mo alloys for fixed dental prostheses in an aqueous solution of 0.05% NaF and in commercial mouthwashes by means of EIS.

Sampaio¹,

Silva²,

Sousa³

et al. 2014

IOSRJEN

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-Ni-Cr-Mo alloys have been used as dental prostheses due their properties such as good mechanical strength, high corrosion resistance and also because they are economically viable. The corrosion protection of these alloys in salt solutions which are typical of physiological media is due to the phenomenon called passivation with an oxide superficial layer formation, particularly chromium oxides. This protective film, subjected to mechanical stress in a corrosive environment, can be broken partially releasing ions that have deleterious effects in a human body. Fluoride ions, existent in hygiene products, change the oral environment and their presence may enable the beginning of a localized corrosion process. The objective of this work is to evaluate the corrosion resistance of three Ni-Cr-Mo alloys, of different compositions: SC (73% Ni, 14% Cr, 8.5% Mo, 1.8% Be, 1.8% Al) SB (61% Ni, 25% Cr, 10.5% Mo, 1.5% Si) and W (65% Ni, 22.5% Cr, 9.5% Mo, 1.0% Nb, 1.0% Si, 0.5% Fe) in media containing fluoride which simulate oral rinse solutions. This study has been performed in solution of 0.05% NaF, NaCl 0.05% and commercial mouthwashes on pH 6.0 at 37°C using metallography analyses, immersion techniques, and electrochemical tests, impedance tests and analysis. SC, with the highest nickel and the lowest chromium content, does not passivate in the studied means showing a continuous increase in current density due to increasing potential, while the other alloys exhibit passivation range of 600 mV and passive current density 10 -6 A/cm 2 . In general, considering the immersion and electrochemical corrosion tests, it is concluded that the worst performance has been attributed to the alloy SC, while W and SB have shown the best performance and very similar behaviors.

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Liberação de íons por biomateriais metálicos

Cited by 9 publications

References 24 publications

Evaluation of ionic degradation and slot corrosion of metallic brackets by the action of different dentifrices

Evaluation of ionic degradation and slot corrosion of metallic brackets by the action of different dentifrices

A Influência Do Nitrogênio Em Aços Inoxidáveis Austeníticos Com Aplicação Em Próteses Ortopédicas

Corrosion of Ni-Cr-Mo alloys for fixed dental prostheses in an aqueous solution of 0.05% NaF and in commercial mouthwashes by means of EIS.

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