Zirconia brackets: An evaluation of morphology and coefficients of friction

Keith, Olga; Kusy, Robert P.; Whitley, Julia

doi:10.1016/s0889-5406(94)70085-0

Cited by 113 publications

(71 citation statements)

References 14 publications

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“…16 Artificial gel saliva was applied with a syringe. 17 A grip held onto EMIC's load cell grasped each wire segment, placed parallel to the bracket slot basis. The InVu bracket (TP Orthodontics, La Porte, Ind) was adhered to the center of a rotating cylinder with Super Bonder (Loctite Brasil Ltda, Sã o Paulo, Brazil) to reduce any possible angulations between the slot and the wire.…”

Section: Methodsmentioning

confidence: 99%

Influence of thermal or chemical degradation on the frictional force of an experimental coated NiTi wire

Bandeira¹,

Santos²,

Pulitini³

et al. 2011

The Angle Orthodontist

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Objective: To evaluate the friction force in sliding systems composed of coated NiTi archwires, coated NiTi subjected to thermal cycling, and coated NiTi subjected to acid solution immersion, and compare them to NiTi and polymeric wires. The null hypothesis is that there will be no difference among the wires as to friction force. Materials and Methods: Samples of NiTi (n 5 05), coated NiTi (n 5 15), and OPTIS (n 5 05) 0.016 inches in diameter and 50 mm long, in conjunction with Metafasix ligatures and saliva in InVu brackets, were submitted to friction testing. Among the 15 coated NiTi samples, 5 were submitted to thermal cycling for 3000 cycles; the other 5 samples were immersed in acid solution for 30 days. The results were statistically analyzed at P . .05 or P . .01. Microscopic analysis was performed in the coated NiTi wires before and after thermal cycling and acid solution immersion. Results: The mean (6 standard deviation) maximum friction force for NiTi, coated NiTi, and OPTIS was 105.20 6 (2.63); 99.65 6 (0.64); 59.76 6 (4.93) (P 5 .000), respectively. There was no significant difference in NiTi, coated NiTi, and acid-immersed coated NiTi (P . .05). Among the thermal-cycled or acid-immersed coated NiTi wires there was lower friction force in those undergoing thermal cycling (P 5 .001). The coated NiTi and the OPTIS presented homogeneous surfaces, whereas NiTi wires presented a heterogeneous surface. Fractures were observed in the coated NiTi wires that underwent thermal cycling.

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Section: Methodsmentioning

confidence: 99%

Influence of thermal or chemical degradation on the frictional force of an experimental coated NiTi wire

Bandeira¹,

Santos²,

Pulitini³

et al. 2011

The Angle Orthodontist

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“…These ceramics are suitable for a variety of clinical applications, including: posts and cores 6,7) , dental implants 8,9) , orthodontic brackets 10,11) , and fixed-partial dentures [12][13][14][15] . Moreover, zirconia ceramic has a polycrystalline structure, which is acid resistant 5,16) .…”

Section: Introductionmentioning

confidence: 99%

Dental zirconia can be etched by hydrofluoric acid

et al. 2014

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The surface morphology and crystal structure change of dental zirconia after hydrofluoric acid (HF) etching were evaluated. Four groups of sintered zirconia specimens were 1) control group, 2) immersion in 9.5%HF at 25 o C for 1, 2, 3, or 24 h, 3) immersion in 9.5%HF at 80o C for 1, 3, 5, or 30 min and 4) immersion in 48%HF at 25 o C for 30 or 60 min. The specimens were evaluated under SEM and XRD. The SEM analysis revealed changes in surface topography for all the HF-etched zirconia specimens. The irregularities surface increased with increasingly longer immersion times and higher etching solution temperatures. The XRD analysis of the HFetched zirconia specimens revealed the presence of a crystalline monoclinic phase along with a tetragonal form. It was concluded HF can etch dental zirconia ceramic, creating micro-morphological changes. Tetragonal-to-monoclinic phase transformation was induced on the etched zirconia surface.

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“…Load was applied at a crosshead speed of 0.5 mm/min and the load at failure was recorded. The microshear bond strength was calculated using the following equation: S=F(N)/A (mm 2 ) Where F is the applied load at fracture in Newton and A is the cross sectional area in mm 2 .…”

Section: Surface Treatment and Microshear Bond Strength Testingmentioning

confidence: 99%

“…These materials, in comparison with porcelain and other non-metal alternatives, provide potentially higher fracture resistance and durability 1) . Zirconia has several applications in dentistry and is used for the fabrication of orthodontic brackets 2) , endodontic posts 3) , abutments 4) , single-unit crowns 5) and fixed partial dentures (FPD) 6) . CAD/CAM technology facilitates the fabrication of complex zirconia restorations with high accuracy 7) .…”

Section: Introductionmentioning

confidence: 99%

Effect of bioglass and silica coating of zirconia substrate on its bond strength to resin cement

2017

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This study aimed to assess the effect of bioglass and silica coating of zirconia substrate on its bond strength to resin cement. A total of 120 specimens were used in this in-vitro, experimental study. Zirconia discs measuring 10×7×2 mm were cut from Y-TZP zirconia blocks, sintered, cleaned and received different surface treatments of sandblasting, bioglass powder coating+etching, bioglass powder coating+etching+silanization, bioglass slurry coating+etching, bioglass slurry coating+etching+silanization, silica coating+silanization, silica coating+etching+silanization and no treatment group (control). Then the microshear bond strength testing and scanning electron microscope (SEM) analysis were done. Data were analyzed using the Mann Whitney U and the Kruskal Wallis tests. Significant differences existed in bond strength of different groups (p<0.001). The sandblasted and bioglass coated groups showed higher and the colloidal silica-coated groups showed lower bond strength compared to the control group.

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Zirconia brackets: An evaluation of morphology and coefficients of friction

Cited by 113 publications

References 14 publications

Influence of thermal or chemical degradation on the frictional force of an experimental coated NiTi wire

Influence of thermal or chemical degradation on the frictional force of an experimental coated NiTi wire

Dental zirconia can be etched by hydrofluoric acid

Effect of bioglass and silica coating of zirconia substrate on its bond strength to resin cement

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