title: Analysis on the precision of the dimensions of self-ligating brackets.
abstract: The present study aimed to evaluate the precision of the torque applied by 0.022" self-ligating brackets of different brands, the precision of parallelism between the inner walls of their slots, and precision of their slot height. Eighty brackets for upper central incisors of eight trademarked models were selected: Abzil, GAC, American Orthodontics, Morelli, Orthometric, Ormco, Forestadent, and Ortho Organizers. Images of the brackets were obtained using a scanning electron microscope (SEM) and these were measured using the AutoCAD 2011 software. The tolerance parameters stated in the ISO 27020 standard were used as references. The results showed that only the Orthometric, Morelli, and Ormco groups showed results inconsistent with the ISO standard. Regarding the parallelism of the internal walls of the slots, most of the models studied had results in line with the ISO prescription, except the Morelli group. In assessing bracket slot height, only the Forestadent, GAC, American Orthodontics, and Ormco groups presented results in accordance with the ISO standard. The GAC, Forestadent, and American Orthodontics groups did not differ in relation to the three factors of the ISO 27020 standard. Great variability of results is observed in relation to all the variables.
authors: Department of Orthodontics, São Leopoldo Mandic (SLMANDIC), Dentistry College, Campinas, Brazil.
authors: Rackel Hatice Milhomens Gualberto
authors: RH
authors: Erduran
authors: Department of Orthodontics, University of São Paulo City (UNICID), São Paulo, Brazil.
authors: Fernando Akio
authors: FA
authors: Maeda
authors: Department of Orthodontics, University of São Paulo City (UNICID), São Paulo, Brazil.
authors: Sandra Regina Mota
authors: SR
authors: Ortiz
authors: Department of Orthodontics, University of São Paulo City (UNICID), São Paulo, Brazil.
authors: Tarcila
authors: T
authors: Triviño
authors: Department of Orthodontics, University of São Paulo City (UNICID), São Paulo, Brazil.
authors: Acácio
authors: A
authors: Fuziy
authors: Department of Orthodontics, University of São Paulo City (UNICID), São Paulo, Brazil.
authors: Paulo Eduardo Guedes
authors: PE
authors: Carvalho
mesh_terms: D004867:Equipment Design; D008422:Materials Testing / Q000379:methods*; D016910:Orthodontic Brackets / Q000592:standards*; D015203:Reproducibility of Results; D019415:Torque
keywords: mechanics; orthodontic brackets; torque