The Experts below are selected from a list of 4404 Experts worldwide ranked by ideXlab platform
Paul W Major - One of the best experts on this subject based on the ideXlab platform.
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Design of an Orthodontic Torque Simulator for Measurement of Bracket Deformation
Sensing and Imaging: An International Journal, 2013Co-Authors: G. W. Melenka, David S Nobes, Paul W Major, Jason P CareyAbstract:The design and testing of an Orthodontic torque simulator that reproduces the effect of archwire rotation on Orthodontic Brackets is described. This unique device is capable of simultaneously measuring the deformation and loads applied to an Orthodontic Bracket due to archwire rotation. Archwire rotation is used by orthodontists to correct the inclination of teeth within the mouth. This Orthodontic torque simulator will provide knowledge of the deformation and loads applied to Orthodontic Bracket that will aide clinicians by describing the effect of archwire rotation on Brackets. This will also impact that design on new archwire\Bracket systems by providing an assessment of performance. Deformation of the Orthodontic Bracket tie wings is measured using a digital image correlation process to measure elastic and plastic deformation. The magnitude of force and moments applied to the Bracket though the archwire is also measured using a six-axis load cell. Initial tests have been performed on two Orthodontic Brackets of varying geometry to demonstrate the measurement capability of the Orthodontic torque simulator. The demonstration experiment shows that a Damon Q Bracket had a final plastic deformation after a single loading of 0.022 mm while the Speed Bracket deformed 0.071 mm. This indicates that the Speed Bracket plastically deforms 3.2 times more than the Damon Q Bracket for similar magnitude of applied moment. The demonstration experiment demonstrates that Bracket geometry affect the deformation of Orthodontic Brackets and this difference can be detected using the Orthodontic torque simulator.
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Research Article Measurement of Orthodontic Bracket Tie Wing Elastic and Plastic Deformation by Arch Wire Torque Expression Utilizing an Optical Image Correlation Technique
2013Co-Authors: Ryan A Lacoursiere, David S Nobes, Darren L N Homeniuk, Jason P Carey, Hisham H Badawi, Paul W MajorAbstract:Copyright © 2010 Ryan A. Lacoursiere et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Orthodontic lingual root movement (torque) is an important aspect of treatment biomechanics and is typically achieved by torsion of a rectangular wire within the Orthodontic Bracket slot which introduces a force couple. The magnitude of the force moment achieved by wire torsion may be influenced by deformation of the Orthodontic Bracket. A device utilizing an optical image correlation technique has been developed to accurately quantify Bracket slot dimensional changes during application of wire torsion. Simultaneous torque moment magnitude, degrees of wire twist, and Bracket slot dimension data can be gathered. Bracket tie wing elastic deformation when loaded was demonstrated and plastic deformation was also observed with a single rotation of the wire. 1
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measurement of plastic and elastic deformation due to third order torque in self ligated Orthodontic Brackets
American Journal of Orthodontics and Dentofacial Orthopedics, 2011Co-Authors: Thomas W Major, David S Nobes, Jason P Carey, Giseon Heo, Paul W MajorAbstract:Introduction Control of root torque is often achieved by introducing a twist in a rectangular archwire. The purpose of this study was to investigate third-order torque on different types of self-ligated Brackets by analyzing the Bracket's elastic and plastic deformations in conjunction with the expressed torque at varying angles of twist. Methods An Orthodontic Bracket was mounted to a load cell that measured forces and moments in all directions. The wire was twisted in the Bracket via a stepper motor, controlled by custom software. Overhead images were taken by a camera through a microscope and processed by using optical correlation to measure deformation. Results At the maximum torquing angle of 63° with 0.019 × 0.025-in stainless steel wire, the total elastic and plastic deformation values were 0.063, 0.033, and 0.137 mm for Damon Q (Ormco, Orange, Calif), In-Ovation R (GAC, Bohemia, NY), and Speed (Strite Industries, Cambridge, Ontario, Canada), respectively. The total plastic deformation values were 0.015, 0.006, and 0.086 mm, respectively, measured at 0° of unloading. Conclusions In-Ovation R had the least deformation due to torquing of the 3 investigated Bracket types. Damon Q and Speed on average had approximately 2.5 and 14 times greater maximum plastic deformation, respectively, than did In-Ovation R.
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Orthodontic Bracket manufacturing tolerances and dimensional differences between select self ligating Brackets
Journal of Dental Biomechanics, 2010Co-Authors: Thomas W Major, David S Nobes, Jason P Carey, Paul W MajorAbstract:In all manufacturing processes there are tolerances; however, Orthodontic Bracket manufacturers seldom state the slot dimensional tolerances. This experiment develops a novel method of analyzing slot profile dimensions using photographs of the slot. Five points are selected along each wall, and lines are fitted to define a trapezoidal slot shape. This investigation measures slot height at the slot's top and bottom, angles between walls, slot taper, and the linearity of each wall. Slot dimensions for 30 upper right central incisor self-ligating stainless steel Brackets from three manufacturers were evaluated. Speed Brackets have a slot height 2% smaller than the nominal 0.559 mm size and have a slightly convergent taper. In-Ovation Brackets have a divergent taper at an average angle of 1.47 degrees. In-Ovation is closest to the nominal value of slot height at the slot base and has the smallest manufacturing tolerances. Damon Q Brackets are the most rectangular in shape, with nearly 90-degree corners between the slot bottom and walls. Damon slot height is on average 3% oversized.
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measurement of Orthodontic Bracket tie wing elastic and plastic deformation by arch wire torque expression utilizing an optical image correlation technique
Journal of Dental Biomechanics, 2010Co-Authors: Ryan A Lacoursiere, David S Nobes, Darren L N Homeniuk, Jason P Carey, Hisham H Badawi, Paul W MajorAbstract:Orthodontic lingual root movement (torque) is an important aspect of treatment biomechanics and is typically achieved by torsion of a rectangular wire within the Orthodontic Bracket slot which introduces a force couple. The magnitude of the force moment achieved by wire torsion may be influenced by deformation of the Orthodontic Bracket. A device utilizing an optical image correlation technique has been developed to accurately quantify Bracket slot dimensional changes during application of wire torsion. Simultaneous torque moment magnitude, degrees of wire twist, and Bracket slot dimension data can be gathered. Bracket tie wing elastic deformation when loaded was demonstrated and plastic deformation was also observed with a single rotation of the wire.
David S Nobes - One of the best experts on this subject based on the ideXlab platform.
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Design of an Orthodontic Torque Simulator for Measurement of Bracket Deformation
Sensing and Imaging: An International Journal, 2013Co-Authors: G. W. Melenka, David S Nobes, Paul W Major, Jason P CareyAbstract:The design and testing of an Orthodontic torque simulator that reproduces the effect of archwire rotation on Orthodontic Brackets is described. This unique device is capable of simultaneously measuring the deformation and loads applied to an Orthodontic Bracket due to archwire rotation. Archwire rotation is used by orthodontists to correct the inclination of teeth within the mouth. This Orthodontic torque simulator will provide knowledge of the deformation and loads applied to Orthodontic Bracket that will aide clinicians by describing the effect of archwire rotation on Brackets. This will also impact that design on new archwire\Bracket systems by providing an assessment of performance. Deformation of the Orthodontic Bracket tie wings is measured using a digital image correlation process to measure elastic and plastic deformation. The magnitude of force and moments applied to the Bracket though the archwire is also measured using a six-axis load cell. Initial tests have been performed on two Orthodontic Brackets of varying geometry to demonstrate the measurement capability of the Orthodontic torque simulator. The demonstration experiment shows that a Damon Q Bracket had a final plastic deformation after a single loading of 0.022 mm while the Speed Bracket deformed 0.071 mm. This indicates that the Speed Bracket plastically deforms 3.2 times more than the Damon Q Bracket for similar magnitude of applied moment. The demonstration experiment demonstrates that Bracket geometry affect the deformation of Orthodontic Brackets and this difference can be detected using the Orthodontic torque simulator.
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Research Article Measurement of Orthodontic Bracket Tie Wing Elastic and Plastic Deformation by Arch Wire Torque Expression Utilizing an Optical Image Correlation Technique
2013Co-Authors: Ryan A Lacoursiere, David S Nobes, Darren L N Homeniuk, Jason P Carey, Hisham H Badawi, Paul W MajorAbstract:Copyright © 2010 Ryan A. Lacoursiere et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Orthodontic lingual root movement (torque) is an important aspect of treatment biomechanics and is typically achieved by torsion of a rectangular wire within the Orthodontic Bracket slot which introduces a force couple. The magnitude of the force moment achieved by wire torsion may be influenced by deformation of the Orthodontic Bracket. A device utilizing an optical image correlation technique has been developed to accurately quantify Bracket slot dimensional changes during application of wire torsion. Simultaneous torque moment magnitude, degrees of wire twist, and Bracket slot dimension data can be gathered. Bracket tie wing elastic deformation when loaded was demonstrated and plastic deformation was also observed with a single rotation of the wire. 1
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measurement of plastic and elastic deformation due to third order torque in self ligated Orthodontic Brackets
American Journal of Orthodontics and Dentofacial Orthopedics, 2011Co-Authors: Thomas W Major, David S Nobes, Jason P Carey, Giseon Heo, Paul W MajorAbstract:Introduction Control of root torque is often achieved by introducing a twist in a rectangular archwire. The purpose of this study was to investigate third-order torque on different types of self-ligated Brackets by analyzing the Bracket's elastic and plastic deformations in conjunction with the expressed torque at varying angles of twist. Methods An Orthodontic Bracket was mounted to a load cell that measured forces and moments in all directions. The wire was twisted in the Bracket via a stepper motor, controlled by custom software. Overhead images were taken by a camera through a microscope and processed by using optical correlation to measure deformation. Results At the maximum torquing angle of 63° with 0.019 × 0.025-in stainless steel wire, the total elastic and plastic deformation values were 0.063, 0.033, and 0.137 mm for Damon Q (Ormco, Orange, Calif), In-Ovation R (GAC, Bohemia, NY), and Speed (Strite Industries, Cambridge, Ontario, Canada), respectively. The total plastic deformation values were 0.015, 0.006, and 0.086 mm, respectively, measured at 0° of unloading. Conclusions In-Ovation R had the least deformation due to torquing of the 3 investigated Bracket types. Damon Q and Speed on average had approximately 2.5 and 14 times greater maximum plastic deformation, respectively, than did In-Ovation R.
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Orthodontic Bracket manufacturing tolerances and dimensional differences between select self ligating Brackets
Journal of Dental Biomechanics, 2010Co-Authors: Thomas W Major, David S Nobes, Jason P Carey, Paul W MajorAbstract:In all manufacturing processes there are tolerances; however, Orthodontic Bracket manufacturers seldom state the slot dimensional tolerances. This experiment develops a novel method of analyzing slot profile dimensions using photographs of the slot. Five points are selected along each wall, and lines are fitted to define a trapezoidal slot shape. This investigation measures slot height at the slot's top and bottom, angles between walls, slot taper, and the linearity of each wall. Slot dimensions for 30 upper right central incisor self-ligating stainless steel Brackets from three manufacturers were evaluated. Speed Brackets have a slot height 2% smaller than the nominal 0.559 mm size and have a slightly convergent taper. In-Ovation Brackets have a divergent taper at an average angle of 1.47 degrees. In-Ovation is closest to the nominal value of slot height at the slot base and has the smallest manufacturing tolerances. Damon Q Brackets are the most rectangular in shape, with nearly 90-degree corners between the slot bottom and walls. Damon slot height is on average 3% oversized.
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measurement of Orthodontic Bracket tie wing elastic and plastic deformation by arch wire torque expression utilizing an optical image correlation technique
Journal of Dental Biomechanics, 2010Co-Authors: Ryan A Lacoursiere, David S Nobes, Darren L N Homeniuk, Jason P Carey, Hisham H Badawi, Paul W MajorAbstract:Orthodontic lingual root movement (torque) is an important aspect of treatment biomechanics and is typically achieved by torsion of a rectangular wire within the Orthodontic Bracket slot which introduces a force couple. The magnitude of the force moment achieved by wire torsion may be influenced by deformation of the Orthodontic Bracket. A device utilizing an optical image correlation technique has been developed to accurately quantify Bracket slot dimensional changes during application of wire torsion. Simultaneous torque moment magnitude, degrees of wire twist, and Bracket slot dimension data can be gathered. Bracket tie wing elastic deformation when loaded was demonstrated and plastic deformation was also observed with a single rotation of the wire.
Jason P Carey - One of the best experts on this subject based on the ideXlab platform.
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Design of an Orthodontic Torque Simulator for Measurement of Bracket Deformation
Sensing and Imaging: An International Journal, 2013Co-Authors: G. W. Melenka, David S Nobes, Paul W Major, Jason P CareyAbstract:The design and testing of an Orthodontic torque simulator that reproduces the effect of archwire rotation on Orthodontic Brackets is described. This unique device is capable of simultaneously measuring the deformation and loads applied to an Orthodontic Bracket due to archwire rotation. Archwire rotation is used by orthodontists to correct the inclination of teeth within the mouth. This Orthodontic torque simulator will provide knowledge of the deformation and loads applied to Orthodontic Bracket that will aide clinicians by describing the effect of archwire rotation on Brackets. This will also impact that design on new archwire\Bracket systems by providing an assessment of performance. Deformation of the Orthodontic Bracket tie wings is measured using a digital image correlation process to measure elastic and plastic deformation. The magnitude of force and moments applied to the Bracket though the archwire is also measured using a six-axis load cell. Initial tests have been performed on two Orthodontic Brackets of varying geometry to demonstrate the measurement capability of the Orthodontic torque simulator. The demonstration experiment shows that a Damon Q Bracket had a final plastic deformation after a single loading of 0.022 mm while the Speed Bracket deformed 0.071 mm. This indicates that the Speed Bracket plastically deforms 3.2 times more than the Damon Q Bracket for similar magnitude of applied moment. The demonstration experiment demonstrates that Bracket geometry affect the deformation of Orthodontic Brackets and this difference can be detected using the Orthodontic torque simulator.
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Research Article Measurement of Orthodontic Bracket Tie Wing Elastic and Plastic Deformation by Arch Wire Torque Expression Utilizing an Optical Image Correlation Technique
2013Co-Authors: Ryan A Lacoursiere, David S Nobes, Darren L N Homeniuk, Jason P Carey, Hisham H Badawi, Paul W MajorAbstract:Copyright © 2010 Ryan A. Lacoursiere et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Orthodontic lingual root movement (torque) is an important aspect of treatment biomechanics and is typically achieved by torsion of a rectangular wire within the Orthodontic Bracket slot which introduces a force couple. The magnitude of the force moment achieved by wire torsion may be influenced by deformation of the Orthodontic Bracket. A device utilizing an optical image correlation technique has been developed to accurately quantify Bracket slot dimensional changes during application of wire torsion. Simultaneous torque moment magnitude, degrees of wire twist, and Bracket slot dimension data can be gathered. Bracket tie wing elastic deformation when loaded was demonstrated and plastic deformation was also observed with a single rotation of the wire. 1
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measurement of plastic and elastic deformation due to third order torque in self ligated Orthodontic Brackets
American Journal of Orthodontics and Dentofacial Orthopedics, 2011Co-Authors: Thomas W Major, David S Nobes, Jason P Carey, Giseon Heo, Paul W MajorAbstract:Introduction Control of root torque is often achieved by introducing a twist in a rectangular archwire. The purpose of this study was to investigate third-order torque on different types of self-ligated Brackets by analyzing the Bracket's elastic and plastic deformations in conjunction with the expressed torque at varying angles of twist. Methods An Orthodontic Bracket was mounted to a load cell that measured forces and moments in all directions. The wire was twisted in the Bracket via a stepper motor, controlled by custom software. Overhead images were taken by a camera through a microscope and processed by using optical correlation to measure deformation. Results At the maximum torquing angle of 63° with 0.019 × 0.025-in stainless steel wire, the total elastic and plastic deformation values were 0.063, 0.033, and 0.137 mm for Damon Q (Ormco, Orange, Calif), In-Ovation R (GAC, Bohemia, NY), and Speed (Strite Industries, Cambridge, Ontario, Canada), respectively. The total plastic deformation values were 0.015, 0.006, and 0.086 mm, respectively, measured at 0° of unloading. Conclusions In-Ovation R had the least deformation due to torquing of the 3 investigated Bracket types. Damon Q and Speed on average had approximately 2.5 and 14 times greater maximum plastic deformation, respectively, than did In-Ovation R.
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Orthodontic Bracket manufacturing tolerances and dimensional differences between select self ligating Brackets
Journal of Dental Biomechanics, 2010Co-Authors: Thomas W Major, David S Nobes, Jason P Carey, Paul W MajorAbstract:In all manufacturing processes there are tolerances; however, Orthodontic Bracket manufacturers seldom state the slot dimensional tolerances. This experiment develops a novel method of analyzing slot profile dimensions using photographs of the slot. Five points are selected along each wall, and lines are fitted to define a trapezoidal slot shape. This investigation measures slot height at the slot's top and bottom, angles between walls, slot taper, and the linearity of each wall. Slot dimensions for 30 upper right central incisor self-ligating stainless steel Brackets from three manufacturers were evaluated. Speed Brackets have a slot height 2% smaller than the nominal 0.559 mm size and have a slightly convergent taper. In-Ovation Brackets have a divergent taper at an average angle of 1.47 degrees. In-Ovation is closest to the nominal value of slot height at the slot base and has the smallest manufacturing tolerances. Damon Q Brackets are the most rectangular in shape, with nearly 90-degree corners between the slot bottom and walls. Damon slot height is on average 3% oversized.
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measurement of Orthodontic Bracket tie wing elastic and plastic deformation by arch wire torque expression utilizing an optical image correlation technique
Journal of Dental Biomechanics, 2010Co-Authors: Ryan A Lacoursiere, David S Nobes, Darren L N Homeniuk, Jason P Carey, Hisham H Badawi, Paul W MajorAbstract:Orthodontic lingual root movement (torque) is an important aspect of treatment biomechanics and is typically achieved by torsion of a rectangular wire within the Orthodontic Bracket slot which introduces a force couple. The magnitude of the force moment achieved by wire torsion may be influenced by deformation of the Orthodontic Bracket. A device utilizing an optical image correlation technique has been developed to accurately quantify Bracket slot dimensional changes during application of wire torsion. Simultaneous torque moment magnitude, degrees of wire twist, and Bracket slot dimension data can be gathered. Bracket tie wing elastic deformation when loaded was demonstrated and plastic deformation was also observed with a single rotation of the wire.
Ryan A Lacoursiere - One of the best experts on this subject based on the ideXlab platform.
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Research Article Measurement of Orthodontic Bracket Tie Wing Elastic and Plastic Deformation by Arch Wire Torque Expression Utilizing an Optical Image Correlation Technique
2013Co-Authors: Ryan A Lacoursiere, David S Nobes, Darren L N Homeniuk, Jason P Carey, Hisham H Badawi, Paul W MajorAbstract:Copyright © 2010 Ryan A. Lacoursiere et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Orthodontic lingual root movement (torque) is an important aspect of treatment biomechanics and is typically achieved by torsion of a rectangular wire within the Orthodontic Bracket slot which introduces a force couple. The magnitude of the force moment achieved by wire torsion may be influenced by deformation of the Orthodontic Bracket. A device utilizing an optical image correlation technique has been developed to accurately quantify Bracket slot dimensional changes during application of wire torsion. Simultaneous torque moment magnitude, degrees of wire twist, and Bracket slot dimension data can be gathered. Bracket tie wing elastic deformation when loaded was demonstrated and plastic deformation was also observed with a single rotation of the wire. 1
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measurement of Orthodontic Bracket tie wing elastic and plastic deformation by arch wire torque expression utilizing an optical image correlation technique
Journal of Dental Biomechanics, 2010Co-Authors: Ryan A Lacoursiere, David S Nobes, Darren L N Homeniuk, Jason P Carey, Hisham H Badawi, Paul W MajorAbstract:Orthodontic lingual root movement (torque) is an important aspect of treatment biomechanics and is typically achieved by torsion of a rectangular wire within the Orthodontic Bracket slot which introduces a force couple. The magnitude of the force moment achieved by wire torsion may be influenced by deformation of the Orthodontic Bracket. A device utilizing an optical image correlation technique has been developed to accurately quantify Bracket slot dimensional changes during application of wire torsion. Simultaneous torque moment magnitude, degrees of wire twist, and Bracket slot dimension data can be gathered. Bracket tie wing elastic deformation when loaded was demonstrated and plastic deformation was also observed with a single rotation of the wire.
Mohammad Khursheed Alam - One of the best experts on this subject based on the ideXlab platform.
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assessment of in vivo bond strength studies of the Orthodontic Bracket adhesive system a systematic review
European Journal of Dentistry, 2018Co-Authors: Tamzid Ahmed, Norma Ab Rahman, Mohammad Khursheed AlamAbstract:The aim of this study was to systematically review the available studies measuring the bond strength of Orthodontic Bracket-adhesive system under different experimental conditions in vivo . Literature search was performed in four different databases: PubMed, Web of Science, Cochrane, and Scopus using the keywords – bond strength, Orthodontic Brackets, Bracket-adhesive, and in vivo . A total of six full-text articles were selected based on the inclusion and exclusion criteria of our study after a careful assessment by the two independent reviewers. Data selection was performed by following PRISMA 2009 guidelines. Five of the selected studies were clinical trials; one study was a randomized clinical trial. From each of the selected articles, the following data were extracted – number of samples, with the type of tooth involved materials under experiment methods of measurement, the time interval between bonding and debonding Orthodontic Brackets, mode of force application, and the bond strength results with the overall outcome. The methodological quality assessment of each article was done by the modified Downs and Black checklist method. The qualitative analyses were done by two independent reviewers. Conflicting issues were resolved in a consensus meeting by consulting the third reviewer (MKA). Meta-analysis could not be performed due to the lack of homogenous study results. The review reached no real conclusion apart from the lack of efforts to clinically evaluate the bonding efficiency of a wide range of Orthodontic Bracket-adhesive systems in terms of debonding force compared to laboratory-based in vitro and ex vivo studies.