The Experts below are selected from a list of 48918 Experts worldwide ranked by ideXlab platform
Ahmad Aldiry - One of the best experts on this subject based on the ideXlab platform.
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An evaluation of two types of nickel-titanium wires in terms of micromorphology and nickel ions’ release following Oral Environment exposure
Progress in Orthodontics, 2015Co-Authors: Abdul Razzak A. Ghazal, Mohammad Y. Hajeer, Rabab Al-sabbagh, Ibrahim Alghoraibi, Ahmad AldiryAbstract:BackgroundThis study aimed to compare superelastic and heat-activated nickel-titanium orthodontic wires’ surface morphology and potential release of nickel ions following exposure to Oral Environment conditions .MethodsTwenty-four 20-mm-length distal cuts of superelastic (NiTi Force I®) and 24 20-mm-length distal cuts of heat-activated (Therma-Ti Lite®) nickel-titanium wires (American Orthodontics, Sheboygan, WI, USA) were divided into two equal groups: 12 wire segments left unused and 12 segments passively exposed to Oral Environment for 1 month. Scanning electron microscopy and atomic force microscopy were used to analyze surface morphology of the wires which were then immersed in artificial saliva for 1 month to determine potential nickel ions’ release by means of atomic absorption spectrophotometer.ResultsHeat-activated nickel-titanium (NiTi) wires were rougher than superelastic wires, and both types of wires released almost the same amount of Ni ions. After clinical exposure, more surface roughness was recorded for superelastic NiTi wires and heat-activated NiTi wires. However, retrieved superelastic NiTi wires released less Ni ions in artificial saliva after clinical exposure, and the same result was recorded regarding heat-activated wires.ConclusionsBoth types of NiTi wires were obviously affected by Oral Environment conditions; their surface roughness significantly increased while the amount of the released Ni ions significantly declined.
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An evaluation of two types of nickel-titanium wires in terms of micromorphology and nickel ions’ release following Oral Environment exposure
Progress in orthodontics, 2015Co-Authors: Abdul Razzak A. Ghazal, Mohammad Y. Hajeer, Rabab Al-sabbagh, Ibrahim Alghoraibi, Ahmad AldiryAbstract:Background This study aimed to compare superelastic and heat-activated nickel-titanium orthodontic wires’ surface morphology and potential release of nickel ions following exposure to Oral Environment conditions.
Itaru Mizoguchi - One of the best experts on this subject based on the ideXlab platform.
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Micro-X-ray diffraction observation of nickel–titanium orthodontic wires in simulated Oral Environment
Biomaterials, 2004Co-Authors: Masahiro Iijima, Yasuyuki Yonekura, William A. Brantley, Hiroki Ohno, Isao Kawashima, Itaru MizoguchiAbstract:A micro-X-ray diffraction (micro-XRD) technique has been employed to determine the phases in two superelastic nickel–titanium orthodontic wires that exhibit shape memory in the Oral Environment and one superelastic nickel–titanium wire that does not exhibit shape memory in vivo. The micro-XRD analyses were performed over the clinically relevant temperature range of 0–55°C, which corresponds to the ingestion of cold and hot liquids, and both straight and bent (135°) test samples were analyzed. The results showed that for straight (as-received) test samples, the rhombohedral phase (R-phase) was definitely present in one shape memory wire product and perhaps in the other shape memory wire product, but was apparently absent in the superelastic wire product that did not display shape memory. Martensite was observed in all three wire products after bending. Phase transformations occurred with temperature changes simulating the Oral Environment for straight test samples of the two shape memory wires, but the micro-XRD pattern changed minimally with temperature for straight test samples of the superelastic wire and for bent test samples of all three wire products. The phase transformations revealed by micro-XRD were consistent with results recently found by temperature-modulated differential scanning calorimetry.
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micro x ray diffraction observation of nickel titanium orthodontic wires in simulated Oral Environment
Biomaterials, 2004Co-Authors: Masahiro Iijima, Yasuyuki Yonekura, William A. Brantley, Hiroki Ohno, Isao Kawashima, W H Guo, Itaru MizoguchiAbstract:A micro-X-ray diffraction (micro-XRD) technique has been employed to determine the phases in two superelastic nickel–titanium orthodontic wires that exhibit shape memory in the Oral Environment and one superelastic nickel–titanium wire that does not exhibit shape memory in vivo. The micro-XRD analyses were performed over the clinically relevant temperature range of 0–55°C, which corresponds to the ingestion of cold and hot liquids, and both straight and bent (135°) test samples were analyzed. The results showed that for straight (as-received) test samples, the rhombohedral phase (R-phase) was definitely present in one shape memory wire product and perhaps in the other shape memory wire product, but was apparently absent in the superelastic wire product that did not display shape memory. Martensite was observed in all three wire products after bending. Phase transformations occurred with temperature changes simulating the Oral Environment for straight test samples of the two shape memory wires, but the micro-XRD pattern changed minimally with temperature for straight test samples of the superelastic wire and for bent test samples of all three wire products. The phase transformations revealed by micro-XRD were consistent with results recently found by temperature-modulated differential scanning calorimetry.
Abdul Razzak A. Ghazal - One of the best experts on this subject based on the ideXlab platform.
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An evaluation of two types of nickel-titanium wires in terms of micromorphology and nickel ions’ release following Oral Environment exposure
Progress in Orthodontics, 2015Co-Authors: Abdul Razzak A. Ghazal, Mohammad Y. Hajeer, Rabab Al-sabbagh, Ibrahim Alghoraibi, Ahmad AldiryAbstract:BackgroundThis study aimed to compare superelastic and heat-activated nickel-titanium orthodontic wires’ surface morphology and potential release of nickel ions following exposure to Oral Environment conditions .MethodsTwenty-four 20-mm-length distal cuts of superelastic (NiTi Force I®) and 24 20-mm-length distal cuts of heat-activated (Therma-Ti Lite®) nickel-titanium wires (American Orthodontics, Sheboygan, WI, USA) were divided into two equal groups: 12 wire segments left unused and 12 segments passively exposed to Oral Environment for 1 month. Scanning electron microscopy and atomic force microscopy were used to analyze surface morphology of the wires which were then immersed in artificial saliva for 1 month to determine potential nickel ions’ release by means of atomic absorption spectrophotometer.ResultsHeat-activated nickel-titanium (NiTi) wires were rougher than superelastic wires, and both types of wires released almost the same amount of Ni ions. After clinical exposure, more surface roughness was recorded for superelastic NiTi wires and heat-activated NiTi wires. However, retrieved superelastic NiTi wires released less Ni ions in artificial saliva after clinical exposure, and the same result was recorded regarding heat-activated wires.ConclusionsBoth types of NiTi wires were obviously affected by Oral Environment conditions; their surface roughness significantly increased while the amount of the released Ni ions significantly declined.
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An evaluation of two types of nickel-titanium wires in terms of micromorphology and nickel ions’ release following Oral Environment exposure
Progress in orthodontics, 2015Co-Authors: Abdul Razzak A. Ghazal, Mohammad Y. Hajeer, Rabab Al-sabbagh, Ibrahim Alghoraibi, Ahmad AldiryAbstract:Background This study aimed to compare superelastic and heat-activated nickel-titanium orthodontic wires’ surface morphology and potential release of nickel ions following exposure to Oral Environment conditions.
Masahiro Iijima - One of the best experts on this subject based on the ideXlab platform.
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Micro-X-ray diffraction observation of nickel–titanium orthodontic wires in simulated Oral Environment
Biomaterials, 2004Co-Authors: Masahiro Iijima, Yasuyuki Yonekura, William A. Brantley, Hiroki Ohno, Isao Kawashima, Itaru MizoguchiAbstract:A micro-X-ray diffraction (micro-XRD) technique has been employed to determine the phases in two superelastic nickel–titanium orthodontic wires that exhibit shape memory in the Oral Environment and one superelastic nickel–titanium wire that does not exhibit shape memory in vivo. The micro-XRD analyses were performed over the clinically relevant temperature range of 0–55°C, which corresponds to the ingestion of cold and hot liquids, and both straight and bent (135°) test samples were analyzed. The results showed that for straight (as-received) test samples, the rhombohedral phase (R-phase) was definitely present in one shape memory wire product and perhaps in the other shape memory wire product, but was apparently absent in the superelastic wire product that did not display shape memory. Martensite was observed in all three wire products after bending. Phase transformations occurred with temperature changes simulating the Oral Environment for straight test samples of the two shape memory wires, but the micro-XRD pattern changed minimally with temperature for straight test samples of the superelastic wire and for bent test samples of all three wire products. The phase transformations revealed by micro-XRD were consistent with results recently found by temperature-modulated differential scanning calorimetry.
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micro x ray diffraction observation of nickel titanium orthodontic wires in simulated Oral Environment
Biomaterials, 2004Co-Authors: Masahiro Iijima, Yasuyuki Yonekura, William A. Brantley, Hiroki Ohno, Isao Kawashima, W H Guo, Itaru MizoguchiAbstract:A micro-X-ray diffraction (micro-XRD) technique has been employed to determine the phases in two superelastic nickel–titanium orthodontic wires that exhibit shape memory in the Oral Environment and one superelastic nickel–titanium wire that does not exhibit shape memory in vivo. The micro-XRD analyses were performed over the clinically relevant temperature range of 0–55°C, which corresponds to the ingestion of cold and hot liquids, and both straight and bent (135°) test samples were analyzed. The results showed that for straight (as-received) test samples, the rhombohedral phase (R-phase) was definitely present in one shape memory wire product and perhaps in the other shape memory wire product, but was apparently absent in the superelastic wire product that did not display shape memory. Martensite was observed in all three wire products after bending. Phase transformations occurred with temperature changes simulating the Oral Environment for straight test samples of the two shape memory wires, but the micro-XRD pattern changed minimally with temperature for straight test samples of the superelastic wire and for bent test samples of all three wire products. The phase transformations revealed by micro-XRD were consistent with results recently found by temperature-modulated differential scanning calorimetry.
Rabab Al-sabbagh - One of the best experts on this subject based on the ideXlab platform.
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An evaluation of two types of nickel-titanium wires in terms of micromorphology and nickel ions’ release following Oral Environment exposure
Progress in Orthodontics, 2015Co-Authors: Abdul Razzak A. Ghazal, Mohammad Y. Hajeer, Rabab Al-sabbagh, Ibrahim Alghoraibi, Ahmad AldiryAbstract:BackgroundThis study aimed to compare superelastic and heat-activated nickel-titanium orthodontic wires’ surface morphology and potential release of nickel ions following exposure to Oral Environment conditions .MethodsTwenty-four 20-mm-length distal cuts of superelastic (NiTi Force I®) and 24 20-mm-length distal cuts of heat-activated (Therma-Ti Lite®) nickel-titanium wires (American Orthodontics, Sheboygan, WI, USA) were divided into two equal groups: 12 wire segments left unused and 12 segments passively exposed to Oral Environment for 1 month. Scanning electron microscopy and atomic force microscopy were used to analyze surface morphology of the wires which were then immersed in artificial saliva for 1 month to determine potential nickel ions’ release by means of atomic absorption spectrophotometer.ResultsHeat-activated nickel-titanium (NiTi) wires were rougher than superelastic wires, and both types of wires released almost the same amount of Ni ions. After clinical exposure, more surface roughness was recorded for superelastic NiTi wires and heat-activated NiTi wires. However, retrieved superelastic NiTi wires released less Ni ions in artificial saliva after clinical exposure, and the same result was recorded regarding heat-activated wires.ConclusionsBoth types of NiTi wires were obviously affected by Oral Environment conditions; their surface roughness significantly increased while the amount of the released Ni ions significantly declined.
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An evaluation of two types of nickel-titanium wires in terms of micromorphology and nickel ions’ release following Oral Environment exposure
Progress in orthodontics, 2015Co-Authors: Abdul Razzak A. Ghazal, Mohammad Y. Hajeer, Rabab Al-sabbagh, Ibrahim Alghoraibi, Ahmad AldiryAbstract:Background This study aimed to compare superelastic and heat-activated nickel-titanium orthodontic wires’ surface morphology and potential release of nickel ions following exposure to Oral Environment conditions.