Tribological response of sterilized and un-sterilized orthodontic wires

Grosgogeat, Brigitte; Jablonská, Eva; Vernet, Justine; Jaffrezic, N.; Lissac, M.; Ponsonnet, Laurence

doi:10.1016/j.msec.2005.10.050

Cited by 12 publications

(11 citation statements)

References 21 publications

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“…Improvement of both physical5–9 and biological properties of these alloys can be obtained by different types of surface and bulk modifications, which include: removal of the top material layers, oxidation, and coatings 10–15. These surface treatments will alter the physical properties and can also change the biological behavior of the material.…”

Section: Introductionmentioning

confidence: 99%

“…Nickel as an element is essential for the human body, however it causes immunological problems when the threshold for its daily ingestion of 200-300 lg 4 is exceeded. Improvement of both physical [5][6][7][8][9] and biological properties of these alloys can be obtained by different types of surface and bulk modifications, which include: removal of the top material layers, oxidation, and coatings. [10][11][12][13][14][15] These surface treatments will alter the physical properties and can also change the biological behavior of the material.…”

Section: Introductionmentioning

confidence: 99%

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In vitro studies on the influence of surface modification of Ni–Ti alloy on human bone cells

Chrzanowski

Neel

Armitage

et al. 2009

J Biomedical Materials Res

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The in vitro cell behavior on Nitinol after different surface treatments was investigated. As references samples, commercially pure titanium (cpTi) and bioactive titanium were used. The surface treatments influenced the topography, surface energy, crystallographic structure, ion release, chemistry, and ability to form apatite layer from simulated body fluids. Regardless of the surface treatment, the bioactivity study showed that the kinetics of apatite film formation was similar for all tested samples. No clear indication of the surface characteristics influence on the ability for calcium-phosphate precipitation was evident. Cell activity studies showed that ground nickel titanium, spark oxidized and thermally oxidized (at 400 degrees C and below) had higher cellular activity and caused increased alkaline phosphatase (ALP) and osteocalcin (OC) expression which was comparable to control tissue culture plastic and titanium reference samples. Regardless of surface modifications, preimmersion of the samples in media for 72 h resulted in cell proliferation at the same level for all samples. Therefore, it can be concluded that preconditioning of samples alters surface properties and modulates the cell response regardless of the initial surface treatment and its properties. Moreover, a detrimental effect on cell response was observed after 7 and 14 days in culture for alkali treated samples. This was attributed to a high surface nickel concentration and a high nickel ion release rate from these surfaces.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In vitro studies on the influence of surface modification of Ni–Ti alloy on human bone cells

Chrzanowski

Neel

Armitage

et al. 2009

J Biomedical Materials Res

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“…These properties could be employed for maxillofacial, orthopaedic and dental applications to ease insertion, removal of implants or introduce forces (bending, compression or tension) on the tissue to improve the healing process. To date, only a few cases have been reported where Ni-Ti alloy was used in these areas (Zheng & Huang 2001;Chu et al 2005;Parashos & Messer 2005;Grosgogeat et al 2006). Owing to the high nickel concentration and relatively poor wear resistance of the native surface, the use of nitinol as an implant may be of concern.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous surface modification techniques were used to improve wear and mechanical properties of implants (Chu et al 2005;Cheng & Zheng 2006a,b;Grosgogeat et al 2006;Ju & Dong 2006;Mändl et al 2006;Ni et al 2006;Liu et al 2007). In general, these techniques were divided into three groups: removal; oxidation; and coating of the implant surface (Hassel 2004).…”

Section: Introductionmentioning

confidence: 99%

Nanomechanical evaluation of nickel–titanium surface properties after alkali and electrochemical treatments

Chrzanowski

Neel

Armitage

et al. 2008

J. R. Soc. Interface.

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In this paper, the suitability of alkali treatment followed by heat treatment at 6008C, and spark oxidation for nickel-titanium, intended for medical applications such as pins, wires and clamps, was evaluated on the basis of nanomechanical and wear testing. In addition, the chemical composition and topography of the surface layer, wetting ability, corrosion resistance and influence of the heat treatment on structure of the alloy were also investigated. The results showed that the highest hardness was observed for alkali-treated samples, and this could be correlated with the structure of the sample that contained martensite and a higher phase transformation temperature. This treatment caused a very large increase of nickel in the top layer and decreased resistance in pitting corrosion. These results disqualified the treatment to be considered as useful for medical applications. On the other hand, the hardness of the oxidized samples was at the same level as that obtained for ground reference samples. Moreover, the oxide layer was enriched with phosphorus, and it was predominantly composed of TiO 2 and phosphorus oxides. This 3.1 mm thick layer had good adhesion to the substrate as indicated by scratch testing and wear resistant in nanowear testing. However, the oxidation did not significantly increase the corrosion resistance of the alloy compared with reference samples.

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“…Some recent researches have been developed with this purpose. Grosgogeat et al 22 examined the effects of both sterilization and surface treatment on the orthodontic arch wire friction coefficient. The overall results highlighted two types of tribological response: abrasive and adhesive behavior.…”

Section: Resultsmentioning

confidence: 99%

The effect of residence time on the tensile properties of superelastic and thermal activated Ni-Ti orthodontic wires

et al. 2011

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Since the 1980s, different devices based on superelastic alloys have been developed to fulfill orthodontic applications. Particularly in the last decades several researches have been carried out to evaluate the mechanical behavior of Ni-Ti alloys, including their tensile, torsion and fatigue properties. However, studies regarding the dependence of elastic properties on residence time of Ni-Ti wires in the oral cavity are scarce. Such approach is essential since metallic alloys are submitted to mechanical stresses during orthodontic treatment as well as pH and temperature fluctuations. The goal of the present contribution is to provide elastic stress-strain results to guide the orthodontic choice between martensitic thermal activated and austenitic superelastic Ni-Ti alloys. From the point of view of an orthodontist, the selection of appropriate materials and the correct maintenance of the orthodontic apparatus are essential needs during clinical treatment. The present work evaluated the elastic behavior of Ni-Ti alloy wires with diameters varying from 0.014 to 0.020 inches, submitted to hysteresis tensile tests with 8% strain. Tensile tests were performed after periods of use of 1, 2 and 3 months in the oral cavity of patients submitted to orthodontic treatment. The results from the hysteresis tests allowed to exam the strain range covered by isostress lines upon loading and unloading, as well as the residual strain after unloading for both superelastic and thermal activated Ni-Ti wires. Superelastic Ni-Ti wires exhibited higher load isostress values compared to thermal activated wires. It was found that such differences in the load isostress values can increase with increasing residence time.

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Tribological response of sterilized and un-sterilized orthodontic wires

Cited by 12 publications

References 21 publications

In vitro studies on the influence of surface modification of Ni–Ti alloy on human bone cells

In vitro studies on the influence of surface modification of Ni–Ti alloy on human bone cells

Nanomechanical evaluation of nickel–titanium surface properties after alkali and electrochemical treatments

The effect of residence time on the tensile properties of superelastic and thermal activated Ni-Ti orthodontic wires

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