Effects of recycling on the mechanical properties and the surface topography of nickel-titanium alloy wires

Lee, Sung Ho; Chang, Young Il

doi:10.1067/mod.2001.118997

Cited by 40 publications

(34 citation statements)

References 9 publications

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“…The alloys have been used in clinical procedures involving metal crowns, ceramometal restorations, full veneer crowns, implant prosthodontics, and cast metal dowel-and-cores. [1][2][3][4][5] Conventionally, base metal alloys are cemented with glass ionomers, resin-modified glass ionomers, or zinc phosphate. On the other hand, resin luting materials were developed to cement esthetic materials, such as all-ceramics and indirect composites.…”

mentioning

confidence: 99%

Bond Strength of Resin Cements to Co-Cr and Ni-Cr Metal Alloys Using Adhesive Primers

Francescantonio

Oliveira

Garcia

et al. 2010

Journal of Prosthodontics

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confidence: 99%

Bond Strength of Resin Cements to Co-Cr and Ni-Cr Metal Alloys Using Adhesive Primers

Francescantonio

Oliveira

Garcia

et al. 2010

Journal of Prosthodontics

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“…Most of the authors focused their attention on the influence of sterilization/disinfection procedures on NiTi wires,[12345678910] but few studies[3911] have been reported regarding SS and TMA wires and only very less studies have been published regarding CoCr wires. Moreover, these are the wires of choice for the fabrication of loops due to their excellent formability and long working range.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of tensile strength and surface topography of orthodontic wires after infection control procedures: An in vitro study

Brindha¹,

Kumaran

Rajasigamani

2014

J Pharm Bioall Sci

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Aim:The aim of this study is to evaluate, the influence of four types of sterilization/disinfection procedures (autoclave, hot air oven, glutaraldehyde, and ultraviolet [UV] light) on the tensile strength and surface topography of three orthodontic wires (stainless steel (SS), titanium - molybdenum alloy [TMA], and cobalt chromium (CoCr)).Materials and Methods:Sample comprised of three types of 8 inches straight length segments of orthodontic wires. They were divided into three groups according to wire composition comprising of 50 samples each. Totally 50 samples of each group were then equally divided into five subgroups according to sterilization method. After sterilization and disinfection of the experimental group, surface topography was examined with scanning electron microscope (SEM) and tensile strength was tested using universal testing machine.Result:The results of this study show that the mean ultimate tensile strength (UTS) of SS wire after four sterilization procedures were similar to the control group (1845.815 ± 142.29 MPa). The mean UTS of TMA wire increases after four sterilization procedures when compared with the control group (874.107 ± 275.939 MPa). The mean UTS of CoCr wire remains same after UV light disinfection, but increases after other three sterilization procedures when compared with the control group (1449.759 ± 156.586 MPa). SEM photographs of the present study shows gross increase in pitting roughness of the surface topography of all the three types of wires after four types of sterilization.Conclusion:Orthodontists who want to offer maximum safety for their patients can sterilize orthodontic wires before placement, as it does not deteriorate the tensile strength and surface roughness of the alloys.

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“…15 Recycling orthodontic wires and brackets was once common, but this practice is no longer recommended in some countries such as the United Kingdom (BOS, Advice Sheet 16). Lee and Chang 22 tested NiTi wires that had been exposed to artificial saliva for 4 weeks and a similar group that was then sterilized at 121°C at 15 to 20 psi for 20 minutes. Although there was no difference in tensile properties or bending fatigue, there were increases in surface roughness and coefficient of friction in the recycled group.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Metal Ion Release from Different Bracket Archwire Combinations: An in vitro Study

Sk¹,

An²,

Cm³

2012

The Journal of Contemporary Dental Practice

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Aim:The metal ion released from the orthodontic appliance may cause allergic reactions particularly nickel and chromium ions. Hence, this study was undertaken to determine the amount of nickel, chromium, copper, cobalt and iron ions released from simulated orthodontic appliance made of new archwires and brackets. Materials and methods:Sixty sets of new archwire, band material, brackets and ligature wires were prepared simulating fixed orthodontic appliance. These sets were divided into four groups of fifteen samples each. Group 1: Stainless steel rectangular archwires. Group 2: Rectangular NiTi archwires. Group 3: Rectangular copper NiTi archwires. Group 4: Rectangular elgiloy archwires. These appliances were immersed in 50 ml of artificial saliva solution and stored in polypropylene bottles in the incubator to simulate oral conditions. After 90 days the solution were tested for nickel, chromium, copper, cobalt and iron ions using atomic absorption spectrophotometer. Results:Results showed that high levels of nickel ions were released from all four groups, compared to all other ions, followed by release of iron ion levels. There is no significant difference in the levels of all metal ions released in the different groups. Conclusion:The study confirms that the use of newer brackets and newer archwires confirms the negligible release of metal ions from the orthodontic appliance.Clinical significance: The measurable amount of metals, released from orthodontic appliances in artificial saliva, was significantly below the average dietary intake and did not reach toxic concentrations.

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Effects of recycling on the mechanical properties and the surface topography of nickel-titanium alloy wires

Cited by 40 publications

References 9 publications

Bond Strength of Resin Cements to Co-Cr and Ni-Cr Metal Alloys Using Adhesive Primers

Bond Strength of Resin Cements to Co-Cr and Ni-Cr Metal Alloys Using Adhesive Primers

Evaluation of tensile strength and surface topography of orthodontic wires after infection control procedures: An in vitro study

Comparison of Metal Ion Release from Different Bracket Archwire Combinations: An in vitro Study

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