Brêtas, Sabryna MariaMacari, SoraiaElias, Ana MariaIto, Izabel YokoMatsumoto, Mírian Aiko Nakane2014-05-272014-05-272005-04-01American Journal of Orthodontics and Dentofacial Orthopedics, v. 127, n. 4, p. 428-433, 2005.0889-5406http://hdl.handle.net/11449/68170Background: Patients with fixed orthodontic appliances often experience an absolute increase in the number of Streptococci mutans colony-forming units (cfu). The aim of this investigation was to study the development of biofilm and S. mutans cfu in connection with stainless steel ligatures and elastomeric rings in orthodontic patients treated with and without 0.4% stannous fluoride gel (SFG). Material: Forty-seven patients were divided into 2 groups: those treated with 0.4% SFG for 4 minutes (experimental) and those without 0.4% SFG (control). In each patient, elastomeric rings were used for ligation on 1 side of the dental arch midline, and stainless steel ligatures were used on the opposite side. Saliva samples were collected before and after appliance placement. At 15 and 30 days after appliance placement, biofilm samples from the stainless steel ligatures and the elastomeric rings were collected and subjected to microbiologic procedures and scanning electron microscopy (SEM) analysis. Results: The numbers of S. mutans cfu in the saliva and biofilm were not statistically different between the teeth fitted with elastomeric rings and stainless steel ligatures, or between the experimental and control groups. SEM analysis showed biofilm formation on both ligature ties. Conclusions: Topical application of 0.4% SFG in orthodontic patients with elastomeric rings or stainless steel ligatures does not cause a significant decrease in S. mutans cfu in the saliva and biofilm. Copyright © 2005 by the American Association of Orthodontists.428-433engelastomerstainless steelstannous fluorideadolescentbacterial countbacterium detectionbiofilmclinical articlecolony forming unitcontrolled studyfemalegelhumanintermethod comparisonligationmalemicrobiologyorthodontic deviceorthodonticssaliva analysissample sizescanning electron microscopyschool childstatistical significanceStreptococcus mutanstime series analysistooth archAdolescentAnalysis of VarianceBiofilmsCariostatic AgentsChildColony Count, MicrobialDental PlaqueElastomersFemaleGelsHumansMaleMicroscopy, Electron, ScanningOrthodontic AppliancesOrthodontic WiresSalivaTin FluoridesArtigo10.1016/j.ajodo.2003.12.024Acesso restrito2-s2.0-16844366017