title: In vivo effects of two acidic soft drinks on shear bond strength of metal orthodontic brackets with and without resin infiltration treatment.
abstract: OBJECTIVE
  To evaluate the in vivo effects of two acidic soft drinks (Coca-Cola and Sprite) on the shear bond strength of metal orthodontic brackets with and without resin infiltration treatment. In addition, the enamel surface was evaluated, after debonding, using a scanning electron microscope.
  
  
  METHODS
  Sixty noncarious maxillary premolars, scheduled for extraction in 30 orthodontic patients, were used. Patients were randomly divided into two groups according to the soft drink tested (Coca-Cola or Sprite). In each group, application of resin infiltration (Icon. DMG, Hamburg, Germany) was done on one side only before bonding of brackets. Patients were told to rinse their mouth with their respective soft drink at room temperature for 5 minutes, three times a day for 3 months. Shear bond strength was tested with a universal testing machine. After shearing test, a scanning electron microscope was used to evaluate enamel erosion. Statistical analysis was performed by twoway analysis of variance followed by the least significant difference test.
  
  
  RESULTS
  The Coca-Cola group without resin infiltration showed the lowest resistance to shearing forces. Scanning electron micrographs of both groups after resin application showed a significant improvement compared with results without resin use, as the enamel appeared smoother and less erosive.
  
  
  CONCLUSIONS
  Pretreatment with the infiltrating resin has proved to result in a significant improvement in shear bond strength, regardless of the type of soft drink consumed.
authors: Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt. shazamohammad@yahoo.com
authors: Shaza M
authors: SM
authors: Hammad
authors: Enas T
authors: ET
authors: Enan
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000293:Adolescent; D001641:Bicuspid / Q000648:ultrastructure; D002253:Carbonated Beverages / Q000145:classification; D002648:Child; D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods; D003743:Dental Enamel / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D005500:Follow-Up Studies; D006801:Humans; D006863:Hydrogen-Ion Concentration; D055115:Light-Curing of Dental Adhesives; D008855:Microscopy, Electron, Scanning; D016910:Orthodontic Brackets; D010756:Phosphoric Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D012117:Resins, Synthetic / Q000737:chemistry; D033081:Shear Strength; D013193:Stainless Steel / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D014077:Tooth Erosion / Q000473:pathology
chemical_list: D003722:Dental Alloys; D010756:Phosphoric Acids; D019279:Resin Cements; D012117:Resins, Synthetic; C477790:Transbond XT; C578177:icon infiltrant; D013193:Stainless Steel; C030242:phosphoric acid