title: Bond strength of two resin cements to dentin after disinfection pretreatment: effects of Er,Cr:YSGG laser compared with chemical antibacterial agent.
abstract: OBJECTIVE
  This study compared the effects of two disinfection procedures (2% chlorhexidine [CHX] solution versus Er,Cr:YSGG laser irradiation) on the shear bond strength of ED primer II/Panavia F2.0 (ED/P) and Excite DSC/Variolink N (Ex/V).
  
  
  BACKGROUND
  Different methods are used for cavity disinfection prior to adhesive cementation, which may influence the bonding ability of resin cements.
  
  
  METHODS
  Flat dentin surfaces were prepared on 100 extracted premolars and randomly divided into 10 groups. In the eight experimental groups, indirect composite samples were cemented with either ED/P or Ex/V under three disinfecting conditions on the dentin surface as follows: (1) CHX application before ED primer II/ after etching, (2) wet laser irradiation (Er,Cr:YSGG laser, 20 Hz, 0.75 W, 15% water +15% air), (3) dry laser irradiation with no water and air cooling. The control groups had no disinfectant application. After 24 h water storage, bond strength test was performed. The data (MPa) were analyzed using two way ANOVA and Tukey tests.
  
  
  RESULTS
  The lowest and highest bond strengths were obtained by dry laser and wet laser (10.18±2.67 and 17.36±2.94 for ED/P, 9.64±2.66 and 20.07±3.36 for Ex/V, respectively). For each cement, two-by-two comparisons of four groups revealed significant differences only for dry laser with others (p<0.001).
  
  
  CONCLUSIONS
  The use of CHX and Er,Cr:YSGG laser at the low fluences with water/air cooling as the antibacterial agents does not adversely influence the bonding ability of the etch-and-rinse and the self-etch cements.
authors.affiliation: Department of Operative Dentistry, Dental Faculty, Shiraz University of Medical Sciences, Shiraz, Iran.
authors.forename: Fereshteh
authors.initials: F
authors.lastname: Shafiei
authors.forename: Reza
authors.initials: R
authors.lastname: Fekrazad
authors.forename: Nazanin
authors.initials: N
authors.lastname: Kiomarsi
authors.forename: Ehsan
authors.initials: E
authors.lastname: Shafiei
mesh_terms: D002710:Chlorhexidine; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000379:methods*; D004202:Disinfectants; D004203:Disinfection / Q000379:methods*; D006801:Humans; D053844:Lasers, Solid-State; D019279:Resin Cements
chemical_list: D004202:Disinfectants; D019279:Resin Cements; D002710:Chlorhexidine