Effect of fluoride prophylactic agents on the mechanical properties of nickel-titanium-based orthodontic wires

Walker, Mary P.; White, Richard; Kula, Katherine

doi:10.1016/j.ajodo.2005.01.015

Cited by 98 publications

(119 citation statements)

References 18 publications

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“…24,30 There are findings that show that fluoridated mouthwashes may influence on the resistance to corrosion 27 and galvanic corrosion 26 of orthodontic brackets as well as on the corrosion and modification of mechanical properties of orthodontic wires. 12,14,17,29,30 Few previous studies were performed to evaluate the influence and clinical implications of fluoridated dentifrices on orthodontic brackets, although there are clinical evidences 25 and in vitro studies 8,9,18,20,22 of the deleterious effects produced by the challenges that these appliances are submitted to in the oral cavity. Knowing that innumerous dentifrices commonly used by orthodontic patients are commercially available, with the most varied compositions and concentrations of substances that in contact with metal can induce alterations and that these changes on the surface properties of orthodontic brackets may jeopardize the orthodontic mechanics, the objective of this study was to evaluate in vitro the ionic degradation and the slot base corrosion of metallic brackets when subjected to mechanical brushing with different dentifrices, through analysis of chemical composition by Energy Dispersive Spectroscopy (EDS) and qualitative analysis through Scanning Electron Microscopy (SEM).…”

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confidence: 99%

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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confidence: 99%

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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“…However, the surface of Ti plate became discolored and corroded after plasma-based fluorine ion implantation. Oral prophylactic fluoride agents were reported to cause discoloration 26) and corrosion [27][28][29][30][31][32] , as well as increase the fracture susceptibility of Ti 33) . The corrosion resistance of Ti depends on the balance between the formation and dissolution of the passive oxide film.…”

Section: Discussionmentioning

confidence: 99%

Plasma-based Fluorine Ion Implantation into Dental Materials for Inhibition of Bacterial Adhesion

2006

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The aims of this study were to evaluate the fluorine depth profiles of pure titanium (Ti) , stainless steel (SUS) , and polymethyl methacrylate(PMMA)modified by plasma-based fluorine ion implantation and the effects of fluorine ion implantation on contact angle, fluoride ion release, and S. mutans adhesion. Fluorine-based gases used were Ar＋F 2 and CF 4 . By means of SIMS, it was found that the peak count of PMMA was the lowest while that of Ti was the highest. Then, up to one minute after Ar sputtering, the presence of fluorine and chromic fluoride could be detected by XPS in the surface and subsurface layer. As for the effects of using CF 4 gas for fluorine ion implantation into SUS substrate, the results were: contact angle was significantly increased; no fluoride ion release was detected; antibacterial activity was significantly increased while initial adhesion was decreased. These findings thus indicated that plasma-based fluorine ion implantation into SUS with CF 4 gas provided surface antibacterial activity which was useful in inhibiting bacterial adhesion.

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“…Due to the hysteresis upon cooling, the elastic modulus of the microactuator at body temperature after it has been heated to form the corkscrew is about 20% less than that of the microactuator in its initial straight rod form. The elastic modulus of the SMP at body temperature, both before (straight rod form) and after (corkscrew form) laser actuation, is more than an order of magnitude lower than that of nitinol [17] used in the Merci ® device described previously. However, the actual flexibility of the devices depends on their geometries as well as their elastic moduli.…”

Section: B Smp Microactuator: Current Status and Future Directionsmentioning

confidence: 99%

Laser-activated shape memory polymer microactuator for thrombus removal following ischemic stroke: preliminary in vitro analysis

Small

Metzger

Wilson

et al. 2005

IEEE J. Select. Topics Quantum Electron.

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Abstract--Due to the narrow (3-hour) treatment window for effective use of the thrombolytic drug recombinant tissue-type plasminogen activator (rt-PA), there is a need to develop alternative treatments for ischemic stroke. We are developing an intravascular device for mechanical thrombus removal using shape memory polymer (SMP). We propose to deliver the SMP microactuator in its secondary straight rod form (length = 4 cm, diameter = 350 µm) through a catheter distal to the vascular occlusion. The microactuator, which is mounted on the end of an optical fiber, is then transformed into its primary corkscrew shape by laser heating (diode laser, λ = 800 nm) above its soft phase glass transition temperature (T gs = 55°C). Once deployed, the microactuator is retracted and the captured thrombus is removed to restore blood flow. The SMP is doped with indocyanine green (ICG) dye to increase absorption of the laser light. Successful deployment of the microactuator depends on the optical properties of the ICG-doped SMP and the optical coupling efficiency of the interface between the optical fiber and the SMP. Spectrophotometry, thermal imaging, and computer simulation aided the initial design effort and continue to be useful tools for optimization of the dye concentration and laser power. Thermomechanical testing was performed to characterize the elastic modulus of the SMP. We have demonstrated laser-activation of the SMP microactuator in air at room temperature, suggesting this concept is a promising therapeutic alternative to rt-PA.

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Effect of fluoride prophylactic agents on the mechanical properties of nickel-titanium-based orthodontic wires

Cited by 98 publications

References 18 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

Plasma-based Fluorine Ion Implantation into Dental Materials for Inhibition of Bacterial Adhesion

Laser-activated shape memory polymer microactuator for thrombus removal following ischemic stroke: preliminary in vitro analysis

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