title: [The effect of simulate intraoral sandblasting on the band strength between enamel and composite resin].
abstract: OBJECTIVE
  To study whether the bond strength between enamel and composite resin could be enhanced by intraoral sand abrasive.
  
  
  METHODS
  Ten human maxillary first incisior teeth were divided into 2 groups  The experimental group was sandblasted with 30 microm Al2O3 (CoJet-Sand, pressure 300 kPa) from a distance of 5 mm for 5 seconds, and the control group were not sandblasted. The Herculite composite resin composite cylinders were bonded with Coltene system. Bonded specimens were stored in 37 degrees C distilled water for 24 h, then were subjected to shear force in a testing machine. Stress at failure was calculated in Mpa, and mode of failure was recorded. The Student t test was applied to the data.
  
  
  RESULTS
  The shear bond strength of experimental groups was (33.0+/-1.8) MPa, and that of control groups was (26.7+/-5.2) MPa,there was significant difference between these two groups. All the adhesive failures happened at the enamel   composite resin interface, except that cohesive failure happened in one sandblasted specimen.
  
  
  CONCLUSIONS
  Intraoral sandblasting could significantly enhance the shear bond strength between enamel and composite resin.
authors.affiliation: Special Department, Peking University Stomatological Hospital, Beijing 100081, China. zhanghp79kq@sina.com
authors.forename: Han-ping
authors.initials: HP
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Wei
authors.forename: Xu-liang
authors.initials: XL
authors.lastname: Deng
authors.forename: Gang
authors.initials: G
authors.lastname: Zheng
mesh_terms: D003188:Composite Resins; D001840:Dental Bonding; D003743:Dental Enamel; D006801:Humans; D013718:Tensile Strength
chemical_list: D003188:Composite Resins