title: [Bonding strength of resin and tooth enamel after teeth bleaching with cold plasma].
abstract: OBJECTIVE
  To investigate the immediate bond strength and surface structure of resin and the tooth enamel which treated by cold plasma.
  
  
  METHODS
  In the study, 40 bovine incisors were divided into two equal parts. In this sense, all enamel adhesive samples were prepared and then randomly divided into 4 groups (n =20). group 1: acid + single bond 2+resin composite (control group); group 2:beyond bleaching+ acid+single bond 2+resin composite; group 3: treated by cold plasma for 5 minutes+ acid+single bond 2+resin composite; group 4: treated by cold plasma for 5 minutes+single bond 2+resin composite. Single bond 2 bonding system and Filtek Z250 resin were used in this experiment. The shear bond strength was tested by universal testing machine. The surface of the enamel in different processes was observed by scanning electron microscope (SEM). Statistical analyses by the single factor analysis of variance and multiple pairwise comparisons were performed with SPSS 17.0 .
  
  
  RESULTS
  The shear bond strength of group 4 (8.60 MPa) was significantly lower than that of the other three groups (P<0.05). The shear bond strength of group 2 (17.89 MPa) was higher than that of group 4, but lower than group 1 and group 3 (P<0.05).There was no significant difference between group 1 (34.82 MPa) and group 3 (34.69 MPa). Scanning electron microscope indicated that the enamel treated by cold plasma had slight molten form, which was different from etched enamel surface.The fractured surface of group 3 was mix fracture, which was similar to the control group (group 1).
  
  
  CONCLUSIONS
  Compared with the conventional clinic bleaching, immediate bond strength of resin-enamel that treated by cold plasma has not been affected.
authors.affiliation: Department of General Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Meng-meng
authors.initials: MM
authors.lastname: Zhu
authors.affiliation: Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100081, China.
authors.forename: Guo-min
authors.initials: GM
authors.lastname: Wang
authors.affiliation: Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100081, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Sun
authors.affiliation: Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100081, China.
authors.forename: Ying-long
authors.initials: YL
authors.lastname: Li
authors.affiliation: Department of General Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Pan
mesh_terms: D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate; D002417:Cattle; D003188:Composite Resins; D001840:Dental Bonding; D003743:Dental Enamel; D003799:Dental Stress Analysis; D058626:Plasma Gases; D019279:Resin Cements; D014073:Tooth Bleaching / Q000379:methods*
chemical_list: D003188:Composite Resins; C444701:Filtek Z250; D058626:Plasma Gases; D019279:Resin Cements; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate