Characterization of the coatings covering esthetic orthodontic archwires and their influence on the bending and frictional properties

Muguruma, Takeshi; Iijima, Masahiro; Yuasa, Toshihiro; Kawaguchi, Kyotaro; Mizoguchi, Itaru

doi:10.2319/022416-161.1

Cited by 26 publications

(37 citation statements)

References 18 publications

(43 reference statements)

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“…However, only DLC-2 produced significantly lower frictional force than the non-coated case in the drawing-friction test with a 10 • positioning of the bracket under the wet condition. This was attributed to partial rupture of the coating of DLC-1, causing increasing wire-binding at the edge of the bracket [34], thereby increasing the frictional force. Crack initiation and ruptured coating regions were not observed for DLC-2, which suggested that the DLC-2 coating had good flexibility as a functionally-graded material with outstanding adhesion to the orthodontic stainless steel substrate.…”

Section: Discussionmentioning

confidence: 99%

Effects of sp2/sp3 Ratio and Hydrogen Content on In Vitro Bending and Frictional Performance of DLC-Coated Orthodontic Stainless Steels

et al. 2018

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Abstract:This study investigated a diamond-like carbon (DLC) coating formed on stainless steels (disk and wire specimens) using a plasma-based ion implantation/deposition method with two different parameters (DLC-1, DLC-2). These specimens were characterized using high-resolution elastic recoil analysis, microscale X-ray photoelectron spectroscopy and nanoindentation testing to determine the hydrogen content, sp 2 /sp 3 ratio and mechanical properties of the coating. Three-point bending and frictional properties were estimated. DLC-1 had a diamond-rich structure at the external surface and a graphite-rich structure at the inner surface, while DLC-2 had a graphite-rich structure at the external surface and a diamond-rich structure at the inner surface. Mean mechanical property values obtained for the external surface were lower than those for the inner surface in both types of DLC-coated specimens. The hydrogen content of DLC-2 was slightly higher versus DLC-1. Both DLC-coated wires produced a significantly higher elastic modulus according to the three-point bending test versus the non-coated wire. DLC-2 produced significantly lower frictional force than the non-coated specimen in the drawing-friction test. The coating of DLC-1 was partially ruptured by the three-point bending and drawing-friction tests. In conclusion, the bending and frictional performance of DLC-coated wire were influenced by the hydrogen content and sp 2 /sp 3 ratio of the coating.

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Section: Discussionmentioning

confidence: 99%

Effects of sp2/sp3 Ratio and Hydrogen Content on In Vitro Bending and Frictional Performance of DLC-Coated Orthodontic Stainless Steels

et al. 2018

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“…The progressive load scratch test used in the present study showed that the BG-coated specimens (DC 15 V) displayed significantly higher frictional forces than the other BG-coated specimens (DC 10 V; AC 10 and 15 V), although the other BG-coated specimens produced slightly higher frictional forces compared with the non-coated stainless steel specimen. The stainless steel wire alloy generally generates lower levels of frictional resistance than coated wires [15], and the BG-coated specimens, in some conditions, displayed frictional performance that was similar to that of the non-coated stainless steel specimens. Thus, the BG coating can likely provide acceptable clinical frictional characteristics.…”

Section: Discussionmentioning

confidence: 99%

“…The frictional properties are attributed to multiple factors, such as surface roughness, hardness, elastic modulus, and the cross-sectional dimensions of the orthodontic wires and brackets [37,38]. A recent study reported that commercially available esthetic coating wire influences the frictional properties [15] and the esthetic polymer coating may increase the frictional resistance due to increased wire-binding at the edge of the bracket. The progressive load scratch test used in the present study showed that the BG-coated specimens (DC 15 V) displayed significantly higher frictional forces than the other BG-coated specimens (DC 10 V; AC 10 and 15 V), although the other BG-coated specimens produced slightly higher frictional forces compared with the non-coated stainless steel specimen.…”

Section: Discussionmentioning

confidence: 99%

“…To overcome these issues, glass fiber-reinforced polymer wires have been investigated [6][7][8][9] but have yet to be used widely because of their brittleness and inability to withstand sufficient force [6][7][8]. Recently, coated archwires, including metal wires coated with polymers and rhodium-plated wires, have been developed [10][11][12][13][14][15]. These are preferred by many patients and orthodontists because of their…”

Section: Introductionmentioning

confidence: 99%

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Electrophoretic Deposition as a New Bioactive Glass Coating Process for Orthodontic Stainless Steel

et al. 2017

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This study investigated the surface modification of orthodontic stainless steel using electrophoretic deposition (EPD) of bioactive glass (BG). The BG coatings were characterized by spectrophotometry, scanning electron microscopy with energy dispersive X-ray spectrometry, and X-ray diffraction. The frictional properties were investigated using a progressive load scratch test. The remineralization ability of the etched dental enamel was studied according to the time-dependent mechanical properties of the enamel using a nano-indentation test. The EPD process using alternating current produced higher values in both reflectance and lightness. Additionally, the BG coating was thinner than that prepared using direct current, and was completely amorphous. All of the BG coatings displayed good interfacial adhesion, and Si and O were the major components. Most BG-coated specimens produced slightly higher frictional forces compared with non-coated specimens. The hardness and elastic modulus of etched enamel specimens immersed with most BG-coated specimens recovered significantly with increasing immersion time compared with the non-coated specimen, and significant acid-neutralization was observed for the BG-coated specimens. The surface modification technique using EPD and BG coating on orthodontic stainless steel may assist the development of new non-cytotoxic orthodontic metallic appliances having satisfactory appearance and remineralization ability.

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“…For example, resin-coated wires showed friction between the bracket and the wire that was equivalent to or higher than that of the conventional metal wire. 8,9 Therefore, development of an orthodontic wire that has a certain esthetic benefit with friction equal to or less than that of a conventional metal wire would be ideal to meet the current clinical demand.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of orthodontic wires covered with a polyether ether ketone tube

Shirakawa

Iwata

Miyake

et al. 2018

The Angle Orthodontist

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Objectives: To evaluate the esthetics and frictional force of an orthodontic wire passed through a newly designed tube made of a polyether ether ketone (PEEK) resin. Materials and Methods: Two types of standard PEEK tubes were prepared at 0.5 3 0.6v and 0.8 3 0.9v, and different archwires were passed through the tubes. Color values were determined according to brightness and hues. Friction was assessed with different bracket-wire combinations, and surface roughness was determined by stereomicroscopy before and after the application of friction. Results: The PEEK tube showed a color difference that was almost identical to that of coated wires conventionally used in clinical practice, indicating a sufficient esthetic property. The result of the friction test showed that the frictional force was greatly reduced by passing the archwire through the PEEK tube in almost all of the archwires tested. Conclusions: Use of the new PEEK tube demonstrated a good combination of esthetic and functional properties for use in orthodontic appliances. (Angle Orthod. 2018;88:442-449.)

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Characterization of the coatings covering esthetic orthodontic archwires and their influence on the bending and frictional properties

Cited by 26 publications

References 18 publications

Effects of sp2/sp3 Ratio and Hydrogen Content on In Vitro Bending and Frictional Performance of DLC-Coated Orthodontic Stainless Steels

Effects of sp2/sp3 Ratio and Hydrogen Content on In Vitro Bending and Frictional Performance of DLC-Coated Orthodontic Stainless Steels

Electrophoretic Deposition as a New Bioactive Glass Coating Process for Orthodontic Stainless Steel

Mechanical properties of orthodontic wires covered with a polyether ether ketone tube

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