Effect of activation and preactivation on the mechanical behavior and neutral position of stainless steel and beta-titanium T-loops
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/52768 |
Resumo: | Objective: To quantify, for each activation, the effect of preactivations of differing distribution and intensity on the neutral position of T-loops (7-mm height), specifically the horizontal force, moment to force (M/F) ratio, and load to deflection ratio. Methods: A total 100 loops measuring 0.017 x 0.025 inches in cross-section were divided into two groups (n = 50 each) according to composition, either stainless steel or beta-titanium. The two groups were further divided into five subgroups, 10 loops each, corresponding to the five preactivations tested: preactivations with occlusal distribution (00, 200, and 401, gingival distribution (201, and occlusal-gingival distribution (40). The loops were subjected to a total activation of 6-mm with 0.5-mm iterations. Statistical analysis was performed using comprised ANOVA and Bonferoni multiple comparison tests, with a significance level of 5%. Results: The location and intensity of preactivation influenced the force intensity. For the M/F ratio, the highest value achieved without preactivation was lower than the height of the loop. Without preactivation, the M/F ratio increased with activation, while the opposite effect was observed with preactivation. The increase in the M/F ratio was greater when the preactivation distribution was partially or fully gingival. Conclusions: Depending on the preactivation distribution, displacement of uprights is higher or lower than the activation, which is a factor to consider in clinical practice. |
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Effect of activation and preactivation on the mechanical behavior and neutral position of stainless steel and beta-titanium T-loopsNeutral positionPreactivationT-loopScience & TechnologyObjective: To quantify, for each activation, the effect of preactivations of differing distribution and intensity on the neutral position of T-loops (7-mm height), specifically the horizontal force, moment to force (M/F) ratio, and load to deflection ratio. Methods: A total 100 loops measuring 0.017 x 0.025 inches in cross-section were divided into two groups (n = 50 each) according to composition, either stainless steel or beta-titanium. The two groups were further divided into five subgroups, 10 loops each, corresponding to the five preactivations tested: preactivations with occlusal distribution (00, 200, and 401, gingival distribution (201, and occlusal-gingival distribution (40). The loops were subjected to a total activation of 6-mm with 0.5-mm iterations. Statistical analysis was performed using comprised ANOVA and Bonferoni multiple comparison tests, with a significance level of 5%. Results: The location and intensity of preactivation influenced the force intensity. For the M/F ratio, the highest value achieved without preactivation was lower than the height of the loop. Without preactivation, the M/F ratio increased with activation, while the opposite effect was observed with preactivation. The increase in the M/F ratio was greater when the preactivation distribution was partially or fully gingival. Conclusions: Depending on the preactivation distribution, displacement of uprights is higher or lower than the activation, which is a factor to consider in clinical practice.This study was carried out and financed by the Faculty of Dental Medicine of University of Porto.info:eu-repo/semantics/publishedVersionKorean Association of OrthodontistsUniversidade do Minhode Castro, Saul MatosMoreira, RuiBraga, A. C.Ferreira, Afonso PinhaoPollmann, Maria Cristina2015-07-012015-07-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/52768eng2234-751810.4041/kjod.2015.45.4.198info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:47:59Zoai:repositorium.sdum.uminho.pt:1822/52768Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:46:07.877909Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Effect of activation and preactivation on the mechanical behavior and neutral position of stainless steel and beta-titanium T-loops |
title |
Effect of activation and preactivation on the mechanical behavior and neutral position of stainless steel and beta-titanium T-loops |
spellingShingle |
Effect of activation and preactivation on the mechanical behavior and neutral position of stainless steel and beta-titanium T-loops de Castro, Saul Matos Neutral position Preactivation T-loop Science & Technology |
title_short |
Effect of activation and preactivation on the mechanical behavior and neutral position of stainless steel and beta-titanium T-loops |
title_full |
Effect of activation and preactivation on the mechanical behavior and neutral position of stainless steel and beta-titanium T-loops |
title_fullStr |
Effect of activation and preactivation on the mechanical behavior and neutral position of stainless steel and beta-titanium T-loops |
title_full_unstemmed |
Effect of activation and preactivation on the mechanical behavior and neutral position of stainless steel and beta-titanium T-loops |
title_sort |
Effect of activation and preactivation on the mechanical behavior and neutral position of stainless steel and beta-titanium T-loops |
author |
de Castro, Saul Matos |
author_facet |
de Castro, Saul Matos Moreira, Rui Braga, A. C. Ferreira, Afonso Pinhao Pollmann, Maria Cristina |
author_role |
author |
author2 |
Moreira, Rui Braga, A. C. Ferreira, Afonso Pinhao Pollmann, Maria Cristina |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
de Castro, Saul Matos Moreira, Rui Braga, A. C. Ferreira, Afonso Pinhao Pollmann, Maria Cristina |
dc.subject.por.fl_str_mv |
Neutral position Preactivation T-loop Science & Technology |
topic |
Neutral position Preactivation T-loop Science & Technology |
description |
Objective: To quantify, for each activation, the effect of preactivations of differing distribution and intensity on the neutral position of T-loops (7-mm height), specifically the horizontal force, moment to force (M/F) ratio, and load to deflection ratio. Methods: A total 100 loops measuring 0.017 x 0.025 inches in cross-section were divided into two groups (n = 50 each) according to composition, either stainless steel or beta-titanium. The two groups were further divided into five subgroups, 10 loops each, corresponding to the five preactivations tested: preactivations with occlusal distribution (00, 200, and 401, gingival distribution (201, and occlusal-gingival distribution (40). The loops were subjected to a total activation of 6-mm with 0.5-mm iterations. Statistical analysis was performed using comprised ANOVA and Bonferoni multiple comparison tests, with a significance level of 5%. Results: The location and intensity of preactivation influenced the force intensity. For the M/F ratio, the highest value achieved without preactivation was lower than the height of the loop. Without preactivation, the M/F ratio increased with activation, while the opposite effect was observed with preactivation. The increase in the M/F ratio was greater when the preactivation distribution was partially or fully gingival. Conclusions: Depending on the preactivation distribution, displacement of uprights is higher or lower than the activation, which is a factor to consider in clinical practice. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-07-01 2015-07-01T00:00:00Z |
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://hdl.handle.net/1822/52768 |
url |
http://hdl.handle.net/1822/52768 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
2234-7518 10.4041/kjod.2015.45.4.198 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Korean Association of Orthodontists |
publisher.none.fl_str_mv |
Korean Association of Orthodontists |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
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1799133029000544256 |