Effects of height and overactivation on a composite nickel-titanium T-loop

Detalhes bibliográficos
Autor(a) principal: Ribeiro, Alexandre
Data de Publicação: 2017
Outros Autores: Martins, Lidia [UNESP], Junior, Roberto Silva [UNESP], White, Larry, Martins, Renato [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.ejwf.2017.08.001
http://hdl.handle.net/11449/170109
Resumo: Objective Evaluate the effect of height and overactivation on the force system produced by composite nickel-titanium T-loops. Material and Methods Forty nickel-titanium/stainless steel (SS) T-loops were divided into four groups according to height (7 or 6 mm) and activation/deactivation protocol (7 mm or 7 mm with 2 mm of overactivation). An Orthodontic Force Tester recorded the y-axis force and the x-axis moment produced for each 0.5 mm of deactivation, while the moment(x)-to-force(y) (M/F) ratio was calculated. The data were analyzed by three analyses of variance of repeated measures to detect differences and interactions between height and protocol on the three variables. Results T-loops with a height of 6 mm produced higher forces (2.97 N vs. 2.66 N) than those of 7 mm. The moments were similar, whereas the M/F was larger for the 7-mm loops (5.76 mm vs. 4.92 mm). The conventional activation produced higher forces (2.99 N vs. 2.64 N), higher moments (16.2 Nmm vs. 13.59 Nmm) but the same M/F. The M/F showed an interaction with deactivation. Conclusion The 6-mm-high T-loops produced higher forces, but lower M/F. The conventional protocol produced higher forces and moments. The M/F ratio was similar for both protocols, but overactivation produced a nearly constant M/F throughout deactivation. The use of a 7-mm-high overactivated segmented nickel-titanium loop might improve the performance of orthodontic space closure.
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spelling Effects of height and overactivation on a composite nickel-titanium T-loopAlloysLoopsNickel-titaniumSpace ClosureObjective Evaluate the effect of height and overactivation on the force system produced by composite nickel-titanium T-loops. Material and Methods Forty nickel-titanium/stainless steel (SS) T-loops were divided into four groups according to height (7 or 6 mm) and activation/deactivation protocol (7 mm or 7 mm with 2 mm of overactivation). An Orthodontic Force Tester recorded the y-axis force and the x-axis moment produced for each 0.5 mm of deactivation, while the moment(x)-to-force(y) (M/F) ratio was calculated. The data were analyzed by three analyses of variance of repeated measures to detect differences and interactions between height and protocol on the three variables. Results T-loops with a height of 6 mm produced higher forces (2.97 N vs. 2.66 N) than those of 7 mm. The moments were similar, whereas the M/F was larger for the 7-mm loops (5.76 mm vs. 4.92 mm). The conventional activation produced higher forces (2.99 N vs. 2.64 N), higher moments (16.2 Nmm vs. 13.59 Nmm) but the same M/F. The M/F showed an interaction with deactivation. Conclusion The 6-mm-high T-loops produced higher forces, but lower M/F. The conventional protocol produced higher forces and moments. The M/F ratio was similar for both protocols, but overactivation produced a nearly constant M/F throughout deactivation. The use of a 7-mm-high overactivated segmented nickel-titanium loop might improve the performance of orthodontic space closure.Private Practice Natal Rio Grande do NorteFaculdade de Odontologia de Araraquara Universidade Estadual Paulista-UNESPBaylor College of DentistryPrivate Practice AraraquaraFaculdade de Odontologia de Araraquara Universidade Estadual Paulista-UNESPRio Grande do NorteUniversidade Estadual Paulista (Unesp)Baylor College of DentistryAraraquaraRibeiro, AlexandreMartins, Lidia [UNESP]Junior, Roberto Silva [UNESP]White, LarryMartins, Renato [UNESP]2018-12-11T16:49:18Z2018-12-11T16:49:18Z2017-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article120-126application/pdfhttp://dx.doi.org/10.1016/j.ejwf.2017.08.001Journal of the World Federation of Orthodontists, v. 6, n. 3, p. 120-126, 2017.2212-4438http://hdl.handle.net/11449/17010910.1016/j.ejwf.2017.08.0012-s2.0-850289932752-s2.0-85028993275.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of the World Federation of Orthodontists0,196info:eu-repo/semantics/openAccess2023-10-15T06:03:06Zoai:repositorio.unesp.br:11449/170109Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-10-15T06:03:06Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Effects of height and overactivation on a composite nickel-titanium T-loop
title Effects of height and overactivation on a composite nickel-titanium T-loop
spellingShingle Effects of height and overactivation on a composite nickel-titanium T-loop
Ribeiro, Alexandre
Alloys
Loops
Nickel-titanium
Space Closure
title_short Effects of height and overactivation on a composite nickel-titanium T-loop
title_full Effects of height and overactivation on a composite nickel-titanium T-loop
title_fullStr Effects of height and overactivation on a composite nickel-titanium T-loop
title_full_unstemmed Effects of height and overactivation on a composite nickel-titanium T-loop
title_sort Effects of height and overactivation on a composite nickel-titanium T-loop
author Ribeiro, Alexandre
author_facet Ribeiro, Alexandre
Martins, Lidia [UNESP]
Junior, Roberto Silva [UNESP]
White, Larry
Martins, Renato [UNESP]
author_role author
author2 Martins, Lidia [UNESP]
Junior, Roberto Silva [UNESP]
White, Larry
Martins, Renato [UNESP]
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Rio Grande do Norte
Universidade Estadual Paulista (Unesp)
Baylor College of Dentistry
Araraquara
dc.contributor.author.fl_str_mv Ribeiro, Alexandre
Martins, Lidia [UNESP]
Junior, Roberto Silva [UNESP]
White, Larry
Martins, Renato [UNESP]
dc.subject.por.fl_str_mv Alloys
Loops
Nickel-titanium
Space Closure
topic Alloys
Loops
Nickel-titanium
Space Closure
description Objective Evaluate the effect of height and overactivation on the force system produced by composite nickel-titanium T-loops. Material and Methods Forty nickel-titanium/stainless steel (SS) T-loops were divided into four groups according to height (7 or 6 mm) and activation/deactivation protocol (7 mm or 7 mm with 2 mm of overactivation). An Orthodontic Force Tester recorded the y-axis force and the x-axis moment produced for each 0.5 mm of deactivation, while the moment(x)-to-force(y) (M/F) ratio was calculated. The data were analyzed by three analyses of variance of repeated measures to detect differences and interactions between height and protocol on the three variables. Results T-loops with a height of 6 mm produced higher forces (2.97 N vs. 2.66 N) than those of 7 mm. The moments were similar, whereas the M/F was larger for the 7-mm loops (5.76 mm vs. 4.92 mm). The conventional activation produced higher forces (2.99 N vs. 2.64 N), higher moments (16.2 Nmm vs. 13.59 Nmm) but the same M/F. The M/F showed an interaction with deactivation. Conclusion The 6-mm-high T-loops produced higher forces, but lower M/F. The conventional protocol produced higher forces and moments. The M/F ratio was similar for both protocols, but overactivation produced a nearly constant M/F throughout deactivation. The use of a 7-mm-high overactivated segmented nickel-titanium loop might improve the performance of orthodontic space closure.
publishDate 2017
dc.date.none.fl_str_mv 2017-09-01
2018-12-11T16:49:18Z
2018-12-11T16:49:18Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1016/j.ejwf.2017.08.001
Journal of the World Federation of Orthodontists, v. 6, n. 3, p. 120-126, 2017.
2212-4438
http://hdl.handle.net/11449/170109
10.1016/j.ejwf.2017.08.001
2-s2.0-85028993275
2-s2.0-85028993275.pdf
url http://dx.doi.org/10.1016/j.ejwf.2017.08.001
http://hdl.handle.net/11449/170109
identifier_str_mv Journal of the World Federation of Orthodontists, v. 6, n. 3, p. 120-126, 2017.
2212-4438
10.1016/j.ejwf.2017.08.001
2-s2.0-85028993275
2-s2.0-85028993275.pdf
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of the World Federation of Orthodontists
0,196
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 120-126
application/pdf
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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