de Oliveira, Guilherme José Pimentel Lopes [UNESP]Pavone, Chaine [UNESP]Costa, Maurício Ribeiro [UNESP]Marcantonio, Rosemary Adriana Chierici [UNESP]2014-05-272014-05-272010-07-01Brazilian Oral Research, v. 24, n. 3, p. 316-322, 2010.1806-83241807-3107http://hdl.handle.net/11449/71756The aim of this study was to evaluate the effect of brushing with a Colgate 360° or Oral B Indicator 35 toothbrush on the shear bond strength of orthodontic brackets bonded to extracted human teeth. The bristle wear and bristle tip morphology were also examined after simulated tooth-brushing. Orthodontic brackets (Roth-P/1 st and 2 nd pre-molar S/D- Slot 0.18) were bonded (Transbond XT ®) to the smoothest surface of each of 45 extracted human molar and premolar teeth. Test specimens were randomly divided into three groups: Group 1, control group with no brushing; Group 2, brushing with the Oral B Indicator 35; Group 3, brushing with the Colgate 360°. Samples were adapted to a machine that simulated tooth-brushing. The bond strength of each bracket to each tooth was assessed with a mechanical testing machine. The bristle wear and bristle tip morphology indices were also assessed. Statistically significant differences were defined for p ≤ 0.05. The average bond strengths (range: 90.18-90.89 kgf/cm 2) did not differ among the three groups. The Colgate 360° showed less bristle wear and a better bristle tip morphology than the Oral B Indicator 35 toothbrush. However, use of either toothbrush did not decrease the bond strength of the orthodontic brackets. Therefore, patients undergoing orthodontic therapy can safely use either toothbrush.316-322engOrthodontic bracketsPrimary preventionToothbrushingresin cementdental bondingdental carehumaninstrumentationmechanical stressmethodologynonparametric testorthodontic deviceshear strengthtooth brushingDental BondingDental Stress AnalysisHumansOrthodontic BracketsResin CementsShear StrengthStatistics, NonparametricStress, MechanicalArtigo10.1590/S1806-83242010000300010S1806-83242010000300010Acesso aberto2-s2.0-779579440192-s2.0-77957944019.pdf3534044399884035