Dissertations / Theses on the topic 'Orthodontic appliances. Orthodontic Wires'
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Bovenizer, Todd S. "An in-vitro investigation of frictional resistance of self-ligating and ceramic brackets when subjected to different ligation methods and tipping angles." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4467.
Full textTitle from document title page. Document formatted into pages; contains x, 97 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 69-76).
Mah, Edward. "Investigation of frictional resistance on orthodontic brackets when subjected to variable moments." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2285.
Full textTitle from document title page. Document formatted into pages; contains x, 101 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 90-100).
O'Leary, Brian C. "Corrosion between orthodontic archwires and bracket couples." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1301.
Full textTitle from document title page. Document formatted into pages; contains viii, 94 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 46-49).
Ali, Khaled Abedela Mahdi. "Application of zirconium-coated titanium wires as restorative orthodontic materials." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1532.
Full textOrthodontic archwires are made from different alloys. It is now possible to match phases of treatment with orthodontic archwires according to its mechanical properties. On this basis, the titanium molybdenum alloys (TMA) in its beta phase have an excellent combination of strength and flexibility when used as archwires to apply biomechanical forces that affect tooth movement. It has recently gained increased popularity in orthodontic treatment. There are, however, disadvantages associated with the use of orthodontic archwires, such as high surface roughness, which increases friction at the archwire-brackets interface during the sliding process. The surface roughness of dental materials is of utmost importance. Properties such as desirable tensile strengths, load deflection, hardness and low modulus of elasticity and resistance against corrosion & wear determine the area of the contact surface, thereby influencing the friction. The main object of this study was to improve the strength and surface roughness of the beta-titanium orthodontic archwires (β-Ti III) and timolium archwires (TIM), taking into account of retention of the archwires strength. The following tasks were performed. Layers of Zr were deposited on the β-Ti archwires and compared with the archwire strength before and after Zr deposition. The structure of selected archwires and its composition and surface roughness was investigated before and after Zr deposition, using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The force of selected archwires before and after deposition with layers of Zr by Hounsfield deflection testing was studied. Two commercially available orthodontic archwires were used in this study, namely, β-Ti III and TIM orthodontic archwires. The archwires were cut into 25 mm long specimens. In this study, the electron beam-physical vapour deposition (EB-PVD) technique was applied to deposit pure Zr (thicknesses of 5, 10, 25 and 50 nm) on selected archwires and the effects thereof were investigated using AFM, SEM and the Hounsfield deflection test. Results of SEM and AFM analysis and deflection tests showed significant differences between Zr-coated archwires compared with uncoated archwires. Zr-coated archwires (5, 10, 25 and 50 nm depositions) had reduced surface roughness compared with uncoated archwires. A high load deflection rate was exhibited by the coated β-Ti III archwires and a low load deflection rate was exhibited by the coated TIM archwires. There was a difference in load deflection rate between the coated and uncoated archwires. Deposition of 5, 10, 25 and 50 nm Zr on both types of β-Ti orthodontic archwires is recommended for even sliding mechanics due to resulting reduced surface roughness with a good load deflection rate compared with uncoated β-Ti orthodontic archwires. KEYWORDS Surface roughness Zirconium Titanium Deflection test Beta titanium orthodontic archwires Orthodontic archwires alloys Coated materials Electron beam-physical vapour deposition Scanning electron microscopy Atomic force microscopy
Moresca, Ricardo Cesar. ""Estudo dos efeitos dos lacebacks ativos e passivos na biomecânica da fase de nivelamento utilizando-se a técnica MBT"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/23/23133/tde-30082006-151221/.
Full textThe purpose of this study was to evaluate the effects of active and passive lacebacks in the biomechanics of the leveling phase, using the MBT technique. The sample was composed of 29 Brazilian subjects (22 female and 7 male), Caucasian, with Class I malocclusion and mean age of 15 years and 5 months. The orthodontic treatment was planned with the extraction of the first premolars, and the leveling phase was performed with stainless steel wire only (0.014, 0.016, 0.018, 0.020 e 0.019 x 0.025). The anchorage control devices used in the upper and lower arches were, respectively, the IHG extraoral appliance and the fixed lingual arch. According to the type of laceback prescription, the sample was divided into four groups: group I 14 subjects in which active lacebacks were used in the upper arch; group II 9 subjects in which passive lacebacks were used in the upper arch; group III 19 subjects in which active lacebacks were used in the lower arch; group IV 10 subjects in which passive lacebacks were used in the lower arch. For each subject of the sample two lateral cephalometric radiographs were taken: one at the beginning and another at the end of the leveling phase, with a mean interval of 21 months. The data were collected using the resources of computerized cephalometry. To perform the analysis of errors, the cephalometric method was repeated in all subjects of the sample, by the same operator, with a minimum interval of 15 days between the measurements. The results revealed that the observed variations were compatible with the estimates of operational errors in cephalometric studies. After statistical analysis and interpretation of the results, it was observed that in group I, only the crown of the upper first molar presented a mesial movement. As to the upper central incisor, both the crown and the root presented a lingual movement. However, the inclination of these teeth was not affected. In group II, the upper first molar remained stable and only the crown of the upper central incisor moved lingually, leading to a clockwise rotation of this tooth. In group III, a mesial movement of both the crown and the root of the lower first molar was observed, along with its extrusion, whereas the position of the lower central incisor remained unchanged. The inclination of these teeth was not affected either. In group IV, it was observed that neither the lower first molar nor the lower central incisor experienced variations in the anteroposterior sense. Vertically, there only was extrusion of the lower first molar.
Kuramae, Mayury. "Avaliação in vitro da força de atrito entre braquetes e fios ortodonticos na distalização do canino superior pela Tecnica de Força Direcional Seqüencial de Tweed-Merrifield." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287932.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
Made available in DSpace on 2018-08-07T01:50:59Z (GMT). No. of bitstreams: 1 Kuramae_Mayury_D.pdf: 15126221 bytes, checksum: 69a444f9af9fdfb714e7271ab940c8fb (MD5) Previous issue date: 2006
Resumo: O objetivo desse estudo foi avaliar in vitro a força de atrito gerada na mecânica de distalização do canino superior pelo uso do gancho ¿J¿ na Técnica da Força Direcional Seqüencial de Tweed-Merrifield, de acordo com as variáveis: tipo e marcas dos braquetes; espessura e marcas dos fios; técnica de amarração e análise das superfícies dos fios e braquetes em microscopia eletrônica de varredura, microscopia de força atômica, além de rugosímetro. Foram utilizados 192 braquetes Edgewise de aço inoxidável de dois tipos e duas marcas comerciais e duas marcas de fios ortodônticos (Morelli, Sorocaba, São Paulo, Brasil e GAC, Central Islip, Nova Iorque, EUA) de aço inoxidável em quatro espessuras, amarrados por ligadura metálica e elastomérica em meio seco e à temperatura ambiente. Foi utilizada uma placa de acrílico retangular simulando um segmento de aparelho fixo composto por quatro braquetes duplos. Cada fio a ser testado teve suas extremidades dobradas justas aos braquetes terminais para que não deslizasse na canaleta e foi amarrado aos braquetes com ligadura de aço inoxidável. A placa de acrílico juntamente com o segmento do fio montado foi fixada no mordente da base da máquina de ensaio universal Instron 4411 (Instron Ltd., High Wycombe, Bucks, Reino Unido) de maneira a ficar posicionada em 45° em relação ao solo, o que foi realizado com o auxílio do esquadro, simulando a angulação do aparelho extrabucal gancho ¿J¿ com o plano oclusal, durante a mecânica de distalização do canino superior. O braquete foi puxado a velocidade de 0,5mm/minuto através do segmento do fio por uma distância de 5mm. Os testes foram repetidos três vezes, trocando-se a combinação braquete/fio a ser testada para cada três grupos. Os valores médios foram obtidos e a força de atrito foi calculada. Após o recorte das canaletas dos braquetes e limpeza dos fios e braquetes, esses foram analisados em microscopia eletrônica de varredura e de força atômica. Além disso, sobre a superfície dos fios foi efetuada a leitura da rugosidade de superfície em micrometros. Os dados foram submetidos à Análise de Variância e ao teste de Tukey (5%). Concluiu-se que: os braquetes duplos proporcionaram maior atrito do que os braquetes simples; os braquetes e fios da marca Morelli proporcionaram maior atrito do que os da GAC; quanto maior a espessura dos fios, maior foi o atrito; a técnica de amarração que gerou maior atrito foi com ligadura elástica quando comparada à ligadura de aço inoxidável; a rugosidade do fio diminuiu com o uso em alguns casos e os fios da marca GAC apresentaram qualitativamente lisura de superfície superior ao da marca Morelli
Abstract: This study aimed to evaluate in vitro frictional forces that result from upper cusp distalization due to using the J-Hook, according to the Tweed-Merrifield Sequential Directional Force technique; variables were: bracket type and manufacturer, wire diameter and manufacturer, ligation method and microscopic surface analysis of brackets and wires. One hundred and ninety-two stainless steel Edgewise brackets, of two different types and manufacturers were used, ligated to orthodontic wires of four diameters and two manufacturers (Morelli, Sorocaba, São Paulo, Brazil and GAC, Central Islip, New York, USA) by means of metallic and elastomeric ligatures, at extraoral environment and ambient temperature. A rectangular acrylic plate was manufactured, imitating a fixed appliance section of four double brackets. The ends of each wire were tightly bended to the terminal brackets, in order to eliminate sliding, and were fixed to the brackets by stainless steel ligatures. Each sample, comprising the acrylic plate, as well as the bracket and wire section, was fixed unto a Instron 4411 testing machine (Instron Ltd., High Wycombe, Bucks, United Kingdom), so that each of them was at a 45º inclination, relative to the horizontal plane, thus imitating the extraoral position of the J-hook, relative to the occlusal plane, during upper cusp distalization. The bracket was pulled for 5mm sliding at a speed of 0.5mm/minute. Tests were performed other three times, each for a different bracket/wire combination, over the three groups. The mean values were obtained and frictional forces were calculated. After cutting bracket slots and cleaning wires and brackets, these were analyzed by scanning electron and atomic force microscopy. Also, surface rugosity, in micrometers, was evaluated. Data underwent Variance analysis and Tukey test (5%). Final observations were: twin brackets provide greater frictional forces; brackets and wires manufactured by Morelli showed greater frictional forces than those by GAC; the larger the wire diameter, the greater the frictional forces; elastomeric ligatures resulted in greater friction than stainless steel ligatures; usage made the wires less roughness just in some cases, and GAC manufactured wires presented greater surface smoothness than those by Morelli
Doutorado
Ortodontia
Doutor em Radiologia Odontológica
Karl, Paul James. "The comparison of centric relation records obtained with and without the use of an anterior deprogrammer appliance." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq21090.pdf.
Full textMichelberger, David James. "An investigation of the friction, wear and corrosion properties of orthodontic appliances." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ40088.pdf.
Full textRoberts, Scott Cameron. "Automated manufacturing of orthodontic appliances." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30057.
Full textApplied Science, Faculty of
Mechanical Engineering, Department of
Graduate
Bales, Jeffrey M. "Deformation of reinforced polycarbonate orthodontic brackets stressed by a labiolingual moment." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0001/MQ32050.pdf.
Full textZelenka, Eileen Ann Glasspoole. "Fluoride-releasing materials for orthodontic appliances." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2001. http://dare.uva.nl/document/59287.
Full textHeinrichs, Dean. "Treatment effects of the Forsus fatigue resistant device a cephalometric investigation /." Morgantown, W. Va. : [West Virginia University Libraries], 2010. http://hdl.handle.net/10450/10930.
Full textTitle from document title page. Document formatted into pages; contains viii, 101 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 83-92).
Do-deLatour, Thuy B. "Effective maxillary protraction hyrax expansion appliance vs. double-hinged expansion appliance /." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10287.
Full textTitle from document title page. Document formatted into pages; contains viii, 99 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 83-90).
Singh, Jagjit. "The mechanical properties and microstructure of orthodontic wires /." Title page, contents and summary only, 1992. http://web4.library.adelaide.edu.au/theses/09DM/09dms617a.pdf.
Full textTsui, Wai-kin, and 徐偉堅. "Bone anchorage for orthodontic tooth movement." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44661605.
Full textWeaver, Kolin E. "The stability of the WALA ridge as a landmark for determining dental archform." Morgantown, W. Va. : [West Virginia University Libraries], 2010. http://hdl.handle.net/10450/10936.
Full textTitle from document title page. Document formatted into pages; contains x, 107 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 87-96).
Ho, C. W. Henry. "Frictional resistance between Begg and Tip-Edge brackets and archwires /." Title page, contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09DM/09dmh678.pdf.
Full textAllen, Katherine Ruth. "Methods of testing the mechanical properties of orthodontic wires /." Title page, table of contents and summary only, 1994. http://web4.library.adelaide.edu.au/theses/09DM/09dma427.pdf.
Full textKantorowitz, Zvi. "The feasibility of bonding orthodontic brackets to laser treated enamel surfaces." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0012/MQ32148.pdf.
Full textDurrett, Sharon Jeane. "Efficacy of composite tooth attachments in conjunction with the invisalign tm system using three-dimensional digital technology." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0004566.
Full textTypescript. Title from title page of source document. Document formatted into pages; contains 35 pages. Includes Vita. Includes bibliographical references.
Paporn, Kaveewatcharanont. "The effect of fixed orthodontic appliances on the oral carriage of Candida species and coliforms in adolescents." Thesis, Hong Kong : University of Hong Kong, 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13436004.
Full textA, Al-Anezi Saud. "Microbial plaque associated with the placement of orthodontic fixed appliances." Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492446.
Full textWigal, Timothy G. "Long-term follow-up of patients treated with the edgewise crowned Herbst appliance in the mixed dentition." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5621.
Full textTitle from document title page. Document formatted into pages; contains xii, 290 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 186-196).
Van, Laecken Ryan. "Treatment effects of the edgewise Herbst appliance a cephalometric and tomographic investigation /." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2452.
Full textTitle from document title page. Document formatted into pages; contains x, 155 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 116-124).
Jackfert, Lindsay. "A comparison of bacterial adherence on standard orthodontic brackets and titanium miniscrew implants an in vivo and in vitro study /." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5608.
Full textTitle from document title page. Document formatted into pages; contains ix, 98 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 66-70).
Kalaskey, Lawrence J. "Bacterial adherence to orthodontic brackets an in vitro study /." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=541.
Full textTitle from document title page. Document formatted into pages; contains x, 118 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 65-72).
Chen, Yong, and 陳勇. "Clinical, microbiological and immunological effects of natural compounds-containing mouthrinses in patients with fixed orthodontic appliance therapy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/196028.
Full textpublished_or_final_version
Dentistry
Doctoral
Doctor of Philosophy
Du, Xi. "Skeletal, dental and muscular effects in class II division 1 malocclusion treated by Herbst appliance /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21129447.
Full textTse, Pui-yee Agnes. "Long-term follow-up in early treatment of Class III." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25314142.
Full textLundström, Fredrik. "Promoting dental health in orthodontic patients studies on measures for microbial plaque control during orthodontic treatment with fixed appliances /." Stockholm : [s.n.], 1985. http://catalog.hathitrust.org/api/volumes/oclc/12230655.html.
Full textCasellas, Clemente. "Skeletal and dental changes with the acrylic splint Herbst appliance." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1868.
Full textTitle from document title page. Document formatted into pages; contains vii, 73 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 64-69).
Sakima, Cristiane Graciano Ponce [UNESP]. "Avaliação das propriedades mecânicas de fios de Níquel-Titânio após incorporação de dobras e/ou tratamento elétrico." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/95761.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A possibilidade de usar fios superelásticos retangulares com níveis de força mais leves (biológicos) permitiria simultâneo alinhamento, nivelamento e torque, o que resultaria em um menor número de fios utilizados, reduzindo custos e tempo de tratamento. Existe uma tendência, principalmente na ortodontia lingual, de se dobrar fios superelásticos (manualmente ou com tratamento térmico/elétrico) para adequar o fio à forma do arco. O objetivo deste trabalho foi avaliar as propriedades mecânicas de fios de NiTi de quatro marcas comerciais diferentes (0,017 x 0,025) após dobras e tratamento elétrico. Os fios foram dobrados com alicates elétricos (sistema DERHT) e com alicate 139 e depois foram comparados com fios retos sem nenhum tratamento (grupo controle) e fios retos com tratamento elétrico sem dobras (grupo controle tratamento elétrico). Na tentativa de simular uma situação clínica, todos os fios foram testados a 36oC na máquina de testes FSI (Sistema Identificador de Forças). Foram testados usando-se braquetes autoligáveis tipo Damon, simulando ativações em segunda ordem de 0 mm a 2 mm. Foram analisadas as seguintes variáveis: força e deslocamento no ponto do limite elástico, força máxima, energia total, energia dissipada, energia perdida, força e deslocamento no início e no fim do platô, inclinação e comprimento do platô. As diferenças estatísticas para os diferentes fios, nos diferentes testes, foram avaliadas pela ANOVA. Os resultados mostraram que: (1) o tratamento elétrico afetou as propriedades mecânicas de todos os fios de maneira geral, existindo uma tendência de diminuição nos níveis de força; (2) quando os fios receberam dobras, todos perderam os platôs de superelasticidade; (3) se o uso de forças leves e constantes é desejável no tratamento ortodôntico, os fios termodinâmicos deveriam ser recomendados na seguinte ordem: Copper NiTi 400, Neo Sentalloy 100 e Copper NiTi 270.
The possibility of using superelastic rectangular Nickel-Titanium wires in early stages of treatment with light forces, could allow more three-dimensional control, a small number of wires, lowering costs and treatment time. There is a tendency, especially in lingual orthodontics of bending superelastic wires (manually or with heat treatment) to adequate the wire in the arch anatomy. The aim of this study was to evaluate the mechanical properties of four commercially available 0.017 x 0.025 inch NiTi archwires after bending and heat treatment. The wires were bent with electrical pliers (DERHT System) and with standard bird beak plier and then compared with straight wires as a control group and another electrical treatment control group. All the wires were tested at 360 C in an orthodontic wire-testing device, a so called Force System Identification (FSI) apparatus. In the FSI a two-bracket system using self ligating Damon brackets simulated second order displacements up to 2 mm. The following variables from the activation/deactivation curves were calculated: force and displacement at yield point, maximum force level, total energy up to maximum displacement, energy loss after deactivation, force and displacement at the beginning and at finish of the plateau, and the slope and length of the plateau. Any statistically significant differences in these variables for the different brands and tests were analyzed using one-way analysis of variance. The results showed that: (1) the electrical treatment affected the characteristics of all the wires tested in a different way but with a tendency of lowering the force levels. (2) When the wires were bent they all lost activation and deactivation plateau of superelasticity. (3) If the use of low and constant force levels are desirable in orthodontic treatment, the thermodynamic wires should be recommended in the following order: Copper Niti 400 , NeoSentalloy 100 and Copper Niti 270.
Tse, Lap Kee Edmond. "A comparative study of the skeletal and dental effects of a modified herbst and the traditional herbst appliances in Southern Chinese a prospective cephalometric study /." Click to view the E-thesis via HKUTO, 1994. http://sunzi.lib.hku.hk/HKUTO/record/B38628454.
Full textAlmandaey, Abdulhakim Ahmad Q. A. "Surgical exposure, bonding and orthodontic traction of impacted maxillary anterior teeth a retrospective study /." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B39766135.
Full text謝珮儀 and Pui-yee Agnes Tse. "Long-term follow-up in early treatment of Class III." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31973139.
Full text杜熹 and Xi Du. "Skeletal, dental and muscular effects in class II division 1 malocclusion treated by Herbst appliance." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31238439.
Full textTang, Lai King Endarra, and 鄧麗瓊. "Assessing treatment effectiveness of removable and fixed orthodontic appliances using the occlusal index." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31953906.
Full textAlmandaey, Abdulhakim Ahmad Q. A. "Surgical exposure, bonding and orthodontic traction of impacted maxillary anterior teeth: a retrospectivestudy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39766135.
Full textAlkalaly, Abdullah Aly Abdullah. "Developing a protocol for the use of a bone-borne Herbst appliance: tissue response and clinicalapplications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46421208.
Full textTran, Chanh Duong. "Evaluation of sports mouthguards." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21804047.
Full textMiller, Kevin Blaine. "A comparison of treatment impacts between invisalign and fixed appliance therapy during the first seven days of treatment." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010291.
Full textTypescript. Title from title page of source document. Document formatted into pages; contains 36 pages. Includes Vita. Includes bibliographical references.
Walton, Daniel K. "Orthodontic Appliance Preferences of Children and Adolescents." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1268236105.
Full textBurns, Nikia R. "Class III camouflage treatment a retrospective study /." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5610.
Full textTitle from document title page. Document formatted into pages; contains ix, 204 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 136-139).
Dawson, Michael. "A microbiological assessment of aerosol generated during debond of fixed orthodontic appliances." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557961.
Full textReddick, Chad R. "A comparative study of nonextraction treatment efficiency using conventional edgewise brackets and self-ligating brackets." Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2007. https://www.mhsl.uab.edu/dt/2009r/reddick.pdf.
Full textParks, Meredith S. "An in vivo and in vitro study of a new orthodontic bonding agent." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4533.
Full textTitle from document title page. Document formatted into pages; contains vi, 108 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 52-61).
Sakima, Cristiane Graciano Ponce. "Avaliação das propriedades mecânicas de fios de Níquel-Titânio após incorporação de dobras e/ou tratamento elétrico /." Araraquara : [s.n.], 2006. http://hdl.handle.net/11449/95761.
Full textBanca: Cyneu Aguiar Pansani
Banca: Arno Locks
Resumo: A possibilidade de usar fios superelásticos retangulares com níveis de força mais leves (biológicos) permitiria simultâneo alinhamento, nivelamento e torque, o que resultaria em um menor número de fios utilizados, reduzindo custos e tempo de tratamento. Existe uma tendência, principalmente na ortodontia lingual, de se dobrar fios superelásticos (manualmente ou com tratamento térmico/elétrico) para adequar o fio à forma do arco. O objetivo deste trabalho foi avaliar as propriedades mecânicas de fios de NiTi de quatro marcas comerciais diferentes (0,017" x 0,025") após dobras e tratamento elétrico. Os fios foram dobrados com alicates elétricos (sistema DERHT) e com alicate 139 e depois foram comparados com fios retos sem nenhum tratamento (grupo controle) e fios retos com tratamento elétrico sem dobras (grupo controle tratamento elétrico). Na tentativa de simular uma situação clínica, todos os fios foram testados a 36oC na máquina de testes FSI (Sistema Identificador de Forças). Foram testados usando-se braquetes autoligáveis tipo Damon, simulando ativações em segunda ordem de 0 mm a 2 mm. Foram analisadas as seguintes variáveis: força e deslocamento no ponto do limite elástico, força máxima, energia total, energia dissipada, energia perdida, força e deslocamento no início e no fim do platô, inclinação e comprimento do platô. As diferenças estatísticas para os diferentes fios, nos diferentes testes, foram avaliadas pela ANOVA. Os resultados mostraram que: (1) o tratamento elétrico afetou as propriedades mecânicas de todos os fios de maneira geral, existindo uma tendência de diminuição nos níveis de força; (2) quando os fios receberam dobras, todos perderam os platôs de superelasticidade; (3) se o uso de forças leves e constantes é desejável no tratamento ortodôntico, os fios termodinâmicos deveriam ser recomendados na seguinte ordem: Copper NiTi 400, Neo Sentalloy 100 e Copper NiTi 270.
Abstract: The possibility of using superelastic rectangular Nickel-Titanium wires in early stages of treatment with light forces, could allow more three-dimensional control, a small number of wires, lowering costs and treatment time. There is a tendency, especially in lingual orthodontics of bending superelastic wires (manually or with heat treatment) to adequate the wire in the arch anatomy. The aim of this study was to evaluate the mechanical properties of four commercially available 0.017 x 0.025 inch NiTi archwires after bending and heat treatment. The wires were bent with electrical pliers (DERHT System) and with standard bird beak plier and then compared with straight wires as a control group and another electrical treatment control group. All the wires were tested at 360 C in an orthodontic wire-testing device, a so called Force System Identification (FSI) apparatus. In the FSI a two-bracket system using self ligating Damon brackets simulated second order displacements up to 2 mm. The following variables from the activation/deactivation curves were calculated: force and displacement at yield point, maximum force level, total energy up to maximum displacement, energy loss after deactivation, force and displacement at the beginning and at finish of the plateau, and the slope and length of the plateau. Any statistically significant differences in these variables for the different brands and tests were analyzed using one-way analysis of variance. The results showed that: (1) the electrical treatment affected the characteristics of all the wires tested in a different way but with a tendency of lowering the force levels. (2) When the wires were bent they all lost activation and deactivation plateau of superelasticity. (3) If the use of low and constant force levels are desirable in orthodontic treatment, the thermodynamic wires should be recommended in the following order: Copper Niti 400 , NeoSentalloy 100 and Copper Niti 270.
Mestre
Phan, Kok-leong. "Treatment changes and effects, and follow-up changes with Headgear-activator and Herbst appliance /." View the Table of Contents & Abstract, 2005. http://sunzi.lib.hku.hk/hkuto/record/B35324818.
Full textLeung, Ka-wai David. "Electromyographic investigation in adolescents being treated with progressive jumping of the mandible." [Hong Kong] : Faculty of Dentistry, The University of Hong Kong, 1996. http://sunzi.lib.hku.hk/HKUTO/record/B38628193.
Full text謝立祺 and Lap Kee Edmond Tse. "A comparative study of the skeletal and dental effects of a modified herbst and the traditional herbst appliances in Southern Chinese: a prospective cephalometric study." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B38628454.
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