%0 Journal Article
%T Assessment of surface friction of self-ligating brackets under conditions of angulated traction
%A Buzzoni
%A Roberta
%A Elias
%A Carlos N.
%A Fernandes
%A Daniel J.
%A Miguel
%A Jos¨¦ Augusto M.
%J Dental Press Journal of Orthodontics
%D 2012
%I Dental Press Editora
%R 10.1590/S2176-94512012000400013
%X objective: the aim of this study was to assess resistance to sliding of stainless steel passive self-ligating brackets with 0¡ã and 2.5¡ã 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¡ã 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¡ã tests.
%K orthodontic brackets
%K friction
%K stainless steel
%K ligation.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S2176-94512012000400013&lng=en&nrm=iso&tlng=en