Download or read book Friction and Wear Properties of Nitrogen Ion implanted Nickel titanium and Beta titanium Arch Wires in Stainless Steel and Ceramic Brackets During Simulated Canine Retraction written by Michael H. Hoxie and published by . This book was released on 1997 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Friction Wear and Adhesion Characteristics of Titanium aluminum Alloys in Vacuum written by Donald H. Buckley and published by . This book was released on 1966 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Friction, wear, and adhesion measurements were made in vacuum of titanium-aluminum alloys containing 11, 16, and 21 weight percent aluminum. Experiments were conducted with a 3/16 inch radius rider sliding on the flat surface of a 2.5 inch diameter disk specimen at loads to 1500 grams. The disk was rotated to produce sliding velocities to 750 centimeters per second. With increasing addition of aluminum to titanium, an increase in lattice ratio for titanium occurred along with a decrease in friction, wear, and adhesion. The increases in lattice ratio with the addition of aluminum to titanium occurred even though the unit cell size decreased; these results are unlike those with the addition of tin and oxygen to alloys exhibited adhesion characteristics which could be considered negligible. These alloys exhibited superior friction and wear properties in vacuum compared with 52100 and 440-C stainless steels. Experiments were conducted with the alloys sliding on themselves and on 440-C stainless steel. Friction was less for the alloys sliding on 440-C stainless than when sliding on themselves.
Download or read book The Effect of Simulated Oral Conditions on Surface Roughness and Friction Properties of Surface treated and Non surface Treated Nickel Titanium Archwires written by Mary Becker and published by . This book was released on 2019 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examined the effect of simulated oral conditions (storage in phosphate-buffered saline (PBS) with bracket-related load deflection at 37±1°C for 12 weeks) on surface-treated and non-surface treated NiTi archwires. Three types of NiTi wires were tested: non-coated NiTi wire, nitrogen-treated NiTi wire, and rhodium-coated NiTi wire. Wire segments from each NiTi wire type underwent surface roughness measurements and friction testing in the as-received condition (control group) and following exposure to a simulated oral environment for 12 weeks (experimental treatment group). A profilometer was used to measure average roughness in three areas of each wire segment. After profilometry, a universal mechanical tester was used for friction testing. Each wire segment was pulled through a bracket in a passive configuration for 5 mm and the minimum, maximum, and mean of the top 10% of the load was calculated. Three representative specimens from each NiTi wire type in each condition were viewed using scanning electron microscopy (SEM) to provide qualitative surface topography analysis. Results of the study showed that all wires stored in simulated oral conditions (PBS at 37±1°C with bracket-related load deflection) were significantly rougher (p 0.05) than their counterparts in the as-received condition. Rhodium-coated wires were found to be significantly rougher (p
Download or read book The Effect of Nitrogen Ion N Implantation on the Friction and Wear Characteristics of Iron written by William R. Jones (Jr.) and published by . This book was released on 1978 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Comparison of Frictional Forces of Conventional Ligation and Self ligation Bracket Systems written by Barbra J. Reed and published by . This book was released on 1998 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wear and Friction of Nitrogen Ion Implanted Steel written by Gary William Egerton and published by . This book was released on 1981 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hardness Friction and Structure of Ion Beam Modified Titanium Alloys Magnesia and Zirconia written by Elizabeth Lee Fleischer and published by . This book was released on 1991 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Friction in Sliding Orthodontic Mechanics written by James R. Gill and published by . This book was released on 1989 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: In response to patient 'demand' for more esthetic orthodontic appliances, brackets of aluminum-oxide ceramics and Teflon-coated archwires and ligature wires are now available to the practitioner. The round, coated archwires are potentially useful during cuspid retraction procedures in bicuspid-extraction orthodontic treatment. Controlled evaluation of frictional forces associated with the ceramic brackets and coated archwires (compared to conventional appliances components of stainless steel) has apparently not been reported in the literature to date. The objective of the present investigation was to measure and compare the magnitudes of frictional forces generated within a relevant sample of brackets, archwires, and ligations during simulated orthodontic edgewise sliding mechanics. Independent variables and their values were 1) bracket (stainless steel, single-crystal ceramic, and polycrystalline ceramic), 2) archwire (uncoated and Teflon-coated stainless steel), and 3) ligation (uncoated and Teflon-coated stainless-steel wires). With coated or uncoated archwires, polycrystalline brackets generated larger frictional forces than either stainless-steel or single-crystal brackets. Teflon-coated archwires in slots of either ceramic bracket generated smaller frictional forces than uncoated archwires, although the ceramic brackets tended to cause greater distressing of the surfaces of both archwires than did the stainless-steel brackets. Theses. (aw).
Download or read book Coated and Uncoated Nickel titanium Archwires written by Loveland, Kelcey Loveland and published by . This book was released on 2017 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examined the effect of exposure to bracket-related load deflection on the mechanical properties and surface characteristics of esthetic coated and uncoated nickel titanium archwires. Two types of coated archwires were tested: one with a rhodium ion coating and another with a polymer coating. Corresponding uncoated wires of the same size were also tested. These four different wires were divided into treatment groups based on exposure to bracket-related load deflection and storage in PBS at 37±1°C. A three-point bend test in DI water at 37±1°C was performed on specimens at three time points: 4 weeks, 8 weeks, and 12 weeks. Unloading forces at 1, 2, and 3 mm of deflection were recorded. After 12 weeks exposure, three representative specimens from each treatment group along with untested wires were viewed using scanning electron microscopy (SEM) to provide a qualitative surface topography analysis. Results of the present study showed that no significant differences (p > 0.05) in unloading force were present in wires exposed to bracket-related load deflection. However, significant differences were observed between coated and uncoated wire types (p
Download or read book Friction Reduction in Beta Titanium Arch Wires by Structural Changes Through Heat Treatment written by Anahita Salehi and published by . This book was released on 2012 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frictional Characteristics of Ion Implanted Orthodontic Arch Wires and Brackets written by Kevin C. Mendes and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Crystal Structure on the Friction and Wear of Titanium and Titanium Alloys in Vacuum written by Donald H. Buckley and published by . This book was released on 1965 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The friction and wear characteristics were determined in vacuum (to 10 to the -9 mm Hg) for titanium and titanium alloys sliding on themselves and on 440-C stainless steel. The titanium alloys included titanium-tin, titanium-oxygen, and titanium-zirconium. The influence of tin and oxygen on the lattice parameters of titanium and its friction and wear characteristics were measured. The effect of crystal transformation from a hexagonal to a cubic form for a zirconium-titanium alloy was also studied. Friction and wear experiments were conducted with a hemispherical rider sliding on a flat disk surface at loads to 1000 grams and speeds to 2250 feet per minute. Experiments were conducted at 750 and 4250 F. While most hexagonal metals have good friction and wear properties, the results of this investigation indicate that titanium, although a hexagonal metal, exhibits relatively high friction. This high friction may be related to a difference in the slip mechanisms for titanium; titanium unlike most hexagonal metals slips on the (lob) planes rather than on the (0001) basal plane. The addition of tin or oxygen to titanium expands the crystal lattice of titanium and reduces the friction and wear characteristics. The friction coefficient obtained for a titanium-zirconium alloy markedly increased; complete seizure occurred when the material transformed from the hexagonal to the cubic form.
Download or read book Affect of Clinical Use and Sterilization on Selected Orthodontic Arch Wires written by Glen Allen Smith and published by . This book was released on 1989 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Corrosion and Nickel Ion Release of Nickel Titanium Archwires with Ion Implantation Technology in Deflected and Nondeflected States written by Kathryn J. Clark and published by . This book was released on 2009 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frictional Properties of Metal and Ceramic Brackets During Simulated Cuspid Retraction written by Hamid M. Omana and published by . This book was released on 1991 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Additive Manufacturing written by Amit Bandyopadhyay and published by CRC Press. This book was released on 2015-09-08 with total page 547 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of additive manufacturing has seen explosive growth in recent years due largely in part to renewed interest from the manufacturing sector. Conceptually, additive manufacturing, or industrial 3D printing, is a way to build parts without using any part-specific tooling or dies from the computer-aided design (CAD) file of the part. Today, mo
Download or read book Orthodontic Brackets written by Haris Khan and published by CreateSpace. This book was released on 2015-03-18 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was authored to cater for all aspects of orthodontic brackets. The focus being to provide students with real time pictures of different brackets available in the market and to determine their behaviour in oral cavity and their appearance after debonding. The main emphasis being on three vital aspects viz; the selection, placement and debonding, this book has accordingly been designed to comprise these three sections. Real times of new and used brackets have been specifically included to provide the students a realistic insight of brackets.Care has been taken to ensure correlation of clinical situation and various bracket selection criterion
