Fatigue failure of as-received and retrieved NiTi orthodontic archwires

Bourauel, Christoph; Scharold, W.; Jäger, Andreas; Eliades, Theodore

doi:10.1016/j.dental.2007.12.007

Cited by 32 publications

(21 citation statements)

References 13 publications

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“…In dentistry, the fracture of devices made of Ni-Ti superelastic alloy, including orthodontic wires, in the oral environment has been reported by several researchers, [9][10][11][12][13] although the relationship between hydrogen absorption and the cause of fracture has not necessarily been clarified. Dental devices are always used in the presence of chloride and/or fluoride.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Absorption and Thermal Desorption Behavior of Ni-Ti Superelastic Alloy Immersed in Neutral NaCl and NaF Solutions under Applied Potential

et al. 2009

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The hydrogen absorption and thermal desorption behavior of Ni-Ti superelastic alloy immersed in neutral NaCl and NaF aqueous solutions at 25C under an applied cathodic potential for 2 h have been systematically investigated by hydrogen thermal desorption analysis. The critical potential for hydrogen absorption is independent of the type and concentration of solution. The amount of absorbed hydrogen increases with decreasing applied potential, although it is only slightly changed by the type of solution. The amount of hydrogen desorbed at low temperatures, for the alloy immersed in NaF solutions, is larger than those in NaCl solutions, suggesting that the type of solution affects the hydrogen states in the alloy. The present results indicate that for Ni-Ti superelastic alloy, compared with titanium and its alloys, the critical potential for hydrogen absorption is located in a more noble direction, and the amount of absorbed hydrogen is large in NaCl and NaF solutions. Thus, the hydrogen embrittlement of Ni-Ti superelastic alloy probably occurs more readily than those of titanium and its alloys in NaCl and NaF solutions.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Absorption and Thermal Desorption Behavior of Ni-Ti Superelastic Alloy Immersed in Neutral NaCl and NaF Solutions under Applied Potential

et al. 2009

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“…The results of this study demonstrated that the Steel × Steel combination showed better performance, and higher tensile strength was needed to cause rupture 22 in comparison with the other alloy combinations. The alloys submitted to welding in electric machines at P50 showed heat intolerance with significant changes in roughness 23 over a large area of fusion and porosity 28 in the welding area, which suggests a significant rearrangement in the molecular structure of alloys.…”

Section: Alloysmentioning

confidence: 82%

“…After welding Contrary to routine orthodontic practice, results suggest that silver soldering must be used with caution in the oral environment [22][23] , which is why this type of welding has been discouraged.…”

Section: As Receivedmentioning

confidence: 94%

“…Observation by SEM of the chemical elements present in stainless steel and Beta-Ti wires alone and the weld bond of Steel × Beta-Ti at P50, showed that the melted and solidified materials present in the chemical components of the two alloys aggregate, which means change in the structural arrangement of these wires under high current (P50). As these changes may clinically interfere with the performance of wires [22][23]35 , use of P50 should be discouraged. Some ligature combinations have shown good performance in the tensile test, but attention must be paid to their topography 35 .…”

Section: Alloysmentioning

confidence: 99%

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The effect of electric spot-welding on the mechanical properties of different orthodontic wire alloys

Nascimento

Santos

Pithon³

et al. 2012

Mat. Res.

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The aim of this study was to test the hypothesis that there is a direct relationship between surface structure and tensile strength of orthodontic alloys submitted to different levels of welding current. Three types of alloys were assessed. One hundred and eight cross-sectional test specimens ("X") were made, 18 for each wire combination, and divided into 6 groups: SS (steel-steel); SN (steel-NiTi); SB (steel-Beta-Ti); NN (NiTi-NiTi); NB (NiTi-Beta-Ti) and BB (Beta-Ti-Beta-Ti), submitted to 6 spot-welding procedures at different levels of current (Super Micro Ponto 3000). Student-Newman-Keuls, Wilcoxon signed-rank, and Kruskal-Wallis tests were used (p < .05). Statistical difference was found between SN group and all the other alloy combinations (p < .05). Initial roughness of alloys ranged from .04 to .55 Ra, with statistical difference between groups (p < .001). The hypothesis was rejected and the tensile strength of Ti-alloys combinations Steel × Beta-Ti was significantly affected by the current level at P50, which changed the properties and structure of the wires.

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“…In order to the heat activation characteristics in the CuNiTi wires, variable temperatures in oral cavity (due to the consumptions of various food) (10) and the effects of fatigue of wires in different solutions under 37°C (11)(12)(13)(14)(15)(16)(17), this study tried to evaluate the effect of thermal cycles and fatigue simultaneously on the CuNiTi wires.…”

Section: Introductionmentioning

confidence: 99%

The Evaluation of the Fatigue and Thermocycling Effects on the Maximum Loading and Unloading Force of the CuNiTi Wire

Jelodar¹,

Shafiei²,

Rezaei³

2015

Iran J Ortho

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Background: In the oral environment orthodontic wires will be subjected to thermal fluctuations and repeated loading (fatigue). Objectives: The aim of this study is to evaluate the thermocycling and fatigue effect on the CuNiti wires. Materials and Methods: Samples of CuNiti wires, 0.014 round, were divided into four groups: 1, Fatigue loading; 2, Fatigue and thermocycling; 3, thermocycling; 4, control. The groups involved in fatigue loading by determined protocol (0.5 mm deflection, 1Hz frequency) also thermocycling performed by this method: bath time (90 seconds), transfer time (15 seconds) and temperature range: 5 -55C.after these procedure, fatigue and thermocycling effects on the maximum loading force (MLF) and maximum unloading force (MULF) assessed with a 3-point bending test. Results: In this study, the amounts of MLF in group 1 and 2 were significantly different with themselves and control group, but in the control group, the results were not significantly different with thermocycling group. Also the amounts of MLF in the group 3 were not different by the group 1 and 2. For the MULF, the results of group 1 and 2 were significantly different with the control and thermocycling group. Difference between fatigue and control groups for hysteresis loading (difference between MLF and MULF) variable was not significant while other two by two comparisons were significant. Conclusions: The fatigue loading increased MLF and MULF, but the effect of thermocycling was complicated on the MLF. Thermocycling also did not affect the MULF, but decreased hysteresis loading.

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Fatigue failure of as-received and retrieved NiTi orthodontic archwires

Cited by 32 publications

References 13 publications

Hydrogen Absorption and Thermal Desorption Behavior of Ni-Ti Superelastic Alloy Immersed in Neutral NaCl and NaF Solutions under Applied Potential

Hydrogen Absorption and Thermal Desorption Behavior of Ni-Ti Superelastic Alloy Immersed in Neutral NaCl and NaF Solutions under Applied Potential

The effect of electric spot-welding on the mechanical properties of different orthodontic wire alloys

The Evaluation of the Fatigue and Thermocycling Effects on the Maximum Loading and Unloading Force of the CuNiTi Wire

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