SciELO - Scientific Electronic Library Online

 
vol.17 número4Estudo comparativo da força de atrito produzida pela deformação de arco NiTi em diferentes braquetes ortodônticos: avaliação in vitroEstabilidade do tratamento de apinhamento anterossuperior índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Dental Press Journal of Orthodontics

versão impressa ISSN 2176-9451

Resumo

BUZZONI, Roberta; ELIAS, Carlos N.; FERNANDES, Daniel J.  e  MIGUEL, José Augusto M.. Assessment of surface friction of self-ligating brackets under conditions of angulated traction. Dental Press J. Orthod. [online]. 2012, vol.17, n.4, pp.51-56. ISSN 2176-9451.  http://dx.doi.org/10.1590/S2176-94512012000400013.

OBJECTIVE: The aim of this study was to assess resistance to sliding of stainless steel passive self-ligating brackets with 0° and 2.5° angulations and to compare them to active self-ligating brackets at zero angulation. The hypothesis to be tested was that passive self-ligating brackets produce lower frictional forces than active self-ligating brackets. METHODS: Twenty five 0.022 x 0.028-in slot maxillary canine brackets were divided into 5 groups of 5 brackets: Damon SL II (Ormco, CA, USA) self-ligating bracket and Gemini (3M/Unitek, CA, USA) conventional bracket with angulation of 0 and 2.5° and a group of Speed 2 (American Orthodontics, WI, USA) active clip self-ligating system with zero angulation. Twenty five segments of stainless steel 0.020-in archwire (TP Orthodontics, IN, USA) were tested and each bracket/wire interface was evaluated at 4 successive points during sliding. Overall, 100 frictional values were analyzed by parametric analysis of variance and Bonferroni tests. RESULTS AND CONCLUSION: Frictional tests were performed with an Emic DL 10000 testing machine (Emic, Brazil) with a load cell of one kilogram. Passive self-ligating brackets produced lower frictional forces than active self-ligating brackets (p < 0.01). Under angulation, brackets with a slide mechanism produced higher friction than the same brackets under zero angulation (p < 0.01). Nevertheless, the slide system under angulation produced smaller friction values than conventional brackets tied with elastomeric ligatures in 0° tests.

Palavras-chave : Orthodontic brackets; Friction; Stainless steel; Ligation.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons