Orthodontic brackets

Iijima, Masahiro; Zinelis, Spiros; Papageorgiou, Spyridon N.; Brantley, William A.; Eliades, Theodore

doi:10.1016/b978-0-08-100383-1.00004-7

Cited by 12 publications

(26 citation statements)

References 74 publications

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“…Recently, new materials, such as titanium and its alloys, cobalt-chromium alloys, and gold alloys, were introduced. Public demand for high aesthetics caused ceramic and plastic brackets to become widely spread 7 .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of magnetic resonance imaging issues of titanium and stainless steel brackets

Linetskiy¹,

Starčcuková²,

Hubálková³

et al. 2019

ScienceAsia

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Magnetic resonance imaging (MRI) is a sophisticated diagnostic method of contemporary medicine. This examination in patients with metallic objects is often complicated due to MRI issues. Clinically significant difference in MRI issues of titanium (equilibrium ti, Dentaurum) and stainless steel (Gemini, 3M Unitec) brackets was studied in a clinical 1.5 T and an experimental 4.7 T MRI scanners. In this in vitro study, the following parameters were assessed: artefacts, magnetic field interaction, and heating. Artefacts were evaluated in spin and gradient echo images using ASTM F2119-07 standard in 1.5 T field. Translational attraction, torque and heating were tested. The titanium bracket for upper lateral incisor produced 2.5-4.3 mm and 4.7-4.9 mm artefacts in spin and gradient echo scans, respectively. The stainless steel bracket for upper lateral incisor caused more than 50 mm distortions in the same sequences. Images of the titanium bracket set were diagnostically acceptable whereas the stainless steel bracket set could not be graded due to the incapability of the MRI scanner to adjust resonance frequency. No clinically relevant translational attraction and no torque were detected for equilibrium ti brackets, while Gemini brackets were strongly attracted by the magnetic field. No clinically significant heating was observed. Noticeable difference in MRI issues of the brackets was observed in artefacts and mobility. Gemini brackets were found unacceptable for MRI.

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Section: Introductionmentioning

confidence: 99%

Evaluation of magnetic resonance imaging issues of titanium and stainless steel brackets

Linetskiy¹,

Starčcuková²,

Hubálková³

et al. 2019

ScienceAsia

View full text Add to dashboard Cite

show abstract

“…However, there are aesthetic issues with metal orthodontic materials [1]. More aesthetically attractive orthodontic materials are desirable, especially for adult patients.…”

Section: Introductionmentioning

confidence: 99%

“…Aesthetic brackets made from ceramics and plastics have been widely used in clinical orthodontics [2,3]. Unfortunately, ceramic brackets have shortcomings stemming from their brittle nature, e.g., occasional fracture when tying the ligature and fracture from archwire forces, along with tooth wear during treatment and enamel fracture at debonding [1,4]. Plastic brackets also have deficiencies, such as a tendency to discolor, wear and creep due to their poor mechanical properties [1,5].…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, ceramic brackets have shortcomings stemming from their brittle nature, e.g., occasional fracture when tying the ligature and fracture from archwire forces, along with tooth wear during treatment and enamel fracture at debonding [1,4]. Plastic brackets also have deficiencies, such as a tendency to discolor, wear and creep due to their poor mechanical properties [1,5]. 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].…”

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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“…Metallic orthodontic appliances, such as brackets and archwires, typically show superior properties [1] and provide many clinical advantages, such as low frictional resistance and good bending performance as orthodontic archwires. They have been widely used in clinical orthodontics, although they have esthetic limitations compared to other orthodontic appliances made from ceramics and plastics.…”

Section: Introductionmentioning

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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Orthodontic brackets

Cited by 12 publications

References 74 publications

Evaluation of magnetic resonance imaging issues of titanium and stainless steel brackets

Evaluation of magnetic resonance imaging issues of titanium and stainless steel brackets

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

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

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