Continuous arch and rectangular loops for the correction of consistent and inconsistent load systems in extruded and tipped maxillary second molars

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dc.contributor.authorShintcovsk, Ricardo Lima
dc.contributor.authorMartins, Lidia Parsekian [UNESP]
dc.contributor.authorShintcovsk, Luegya Knop
dc.contributor.authorTanaka, Orlando Motohiro
dc.contributor.authorMartins, Renato Parsekian [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionPontificia Univ Catolica Parana
dc.date.accessioned2018-11-26T17:48:41Z
dc.date.available2018-11-26T17:48:41Z
dc.date.issued2018-03-01
dc.description.abstractIntroduction: The aim of this research was to compare the load systems produced by rectangular loops and continuous arches for the correction of extruded second molars with a mesial inclination (inconsistent system) and a distal inclination (consistent system). Methods: The maxillary first molar of an acrylic model of a patient, with passive brackets and tubes bonded, was connected to a 3-dimensional load cell of an orthodontic force tester, and the second molar was replaced by its respective tube bonded to a second load cell. The second molar tube was moved 2.5 mm occlusally and tipped 20 degrees mesially and distally, creating an inconsistent force system and a consistent force system. For each situation, ten 0.017 x 0.025-in beta-titanium, 8 x 10-mm rectangular loops were compared with 10 0.014-in nickel-titanium continuous arches. The vertical forces-F(z)-and tipping moments-M(x)-were compared using 4 t tests, at 5%. Results: In the inconsistent group, the rectangular loop produced a larger M(x) in both molars: 2.11 N.mm in the second molar compared with the 0.15 N.mm of the continuous arches. On the first molar, the rectangular loops produced -5.58 N.mm against -2.08 N.mm produced by the continuous arches. The F(z) values produced at the second molar with each system were similar, whereas on the first molar they were different; the rectangular loops produced 0.41N, and continuous arches produced 0.53N. In the consistent group, the rectangular loops produced smaller M(x) values at the second molar (-3.06 N.mm) than did the continuous arch (-4.25 N.mm) (P = 0.01), as well as a smaller F(z) value (-0.52 vs -0.92 N, respectively). At the first molar, the rectangular loops produced smaller M(x) values (-2.32 N.mm) than did the continuous arch (-4.18 N.mm), as well as a smaller F(z) value (0.59 vs 1.10 N). Conclusions: In the inconsistent group, only the rectangular loop produced a system of force that could correct the second molar. In the consistent system, both group mechanics produced a system of force compatible with the correction of the second molar, but the continuous wire produced larger moments. Both groups showed a tendency for mesial crown tipping of the first molar.en
dc.description.affiliationUniv Estadual Paulista, Dept Pediat & Orthodont, Fac Odontol Araraquara, Araraquara, SP, Brazil
dc.description.affiliationPontificia Univ Catolica Parana, Grad Dent Program Orthodont, Curitiba, Parana, Brazil
dc.description.affiliationUniv Estadual Paulista, Program Orthodont, Fac Odontol Araraquara, Araraquara, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Pediat & Orthodont, Fac Odontol Araraquara, Araraquara, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Program Orthodont, Fac Odontol Araraquara, Araraquara, SP, Brazil
dc.format.extent396-404
dc.identifierhttp://dx.doi.org/10.1016/j.ajodo.2017.07.021
dc.identifier.citationAmerican Journal Of Orthodontics And Dentofacial Orthopedics. New York: Mosby-elsevier, v. 153, n. 3, p. 396-404, 2018.
dc.identifier.doi10.1016/j.ajodo.2017.07.021
dc.identifier.fileWOS000427391000018.pdf
dc.identifier.issn0889-5406
dc.identifier.urihttp://hdl.handle.net/11449/163993
dc.identifier.wosWOS:000427391000018
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofAmerican Journal Of Orthodontics And Dentofacial Orthopedics
dc.relation.ispartofsjr1,289
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.titleContinuous arch and rectangular loops for the correction of consistent and inconsistent load systems in extruded and tipped maxillary second molarsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.

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