Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/52768
Título: | Effect of activation and preactivation on the mechanical behavior and neutral position of stainless steel and beta-titanium T-loops |
Autor(es): | de Castro, Saul Matos Moreira, Rui Braga, A. C. Ferreira, Afonso Pinhao Pollmann, Maria Cristina |
Palavras-chave: | Neutral position Preactivation T-loop |
Data: | 1-Jul-2015 |
Editora: | Korean Association of Orthodontists |
Revista: | Korean Journal of Orthodontics |
Resumo(s): | 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. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/52768 |
DOI: | 10.4041/kjod.2015.45.4.198 |
ISSN: | 2234-7518 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CAlg - Artigos em revistas internacionais / Papers in international journals |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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RevInd3_2015_KJO14_Saul.pdf | 976,3 kB | Adobe PDF | Ver/Abrir |