title: How wet should dentin be? Comparison of methods to remove excess water during moist bonding.
abstract: OBJECTIVE
  The aim of this study was to evaluate the shear bond strength of two adhesive systems when applied on dentin surfaces with different degrees of wetness.
  
  
  METHODS
  Two-hundred ten dentin specimens were used. After conditioning with 35% phosphoric acid gel and washing, seven methods of drying dentin were used: 30 s air spray (groups 1 and 2), 5 s air spray (groups 3 and 4), dry cotton pellets (groups 7 and 8), wet cotton pellets (groups 9 and 10), microbrush (groups 11 and 12), absorbent paper (groups 13 and 14). The last group was not dried; the dentin surfaces were left overwet (groups 5 and 6). Prime & Bond 2.1 adhesive was applied on the odd-numbered groups and Scotchbond Multi Purpose on the even-numbered groups. Z100 composite cylinders were bonded to the adhesive and the specimens were subjected to a shear bond test.
  
  
  RESULTS
  The Least-Squares Means test was used to compare the following results, where different letters indicate significantly different mean values: Group 9 (G9) = 23.2 MPa (a), G3 = 21.3 MPa (ab), G2 = 19.5 MPa (bc), G10 = 18.6 MPa (bc), G14 = 16.3 MPa (cd), G8 = 16.1 MPa (cd), G4 = 14.6 MPa (de), G13 = 14.0 MPa (de), G11 = 13.9 MPa (de), G7 = 13.5 MPa (de), G12 = 12.1 MPa (e), G1 = 8.2 MPa (f), G5 = 2.7 MPa (g), G6 = 2.4 MPa (g).
  
  
  CONCLUSIONS
  The adhesion values were affected both by the degree of dentin wetness and by the adhesive systems.
authors.affiliation: Gama Filho University, School of Dentistry, Rio de Janeiro, Brazil. giseledamiana@yahoo.com
authors.forename: G D
authors.initials: GD
authors.lastname: Pereira
authors.forename: L A
authors.initials: LA
authors.lastname: Paulillo
authors.forename: M F
authors.initials: MF
authors.lastname: De Goes
authors.forename: C T
authors.initials: CT
authors.lastname: Dias
mesh_terms: D000096:Acetone; D000704:Analysis of Variance; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D003804:Dentin / Q000737:chemistry*; D017220:Dentin-Bonding Agents; D003890:Desiccation / Q000379:methods*; D006801:Humans; D016018:Least-Squares Analysis; D008422:Materials Testing; D008964:Molar, Third; D011109:Polymethacrylic Acids; D019279:Resin Cements; D012822:Silicon Dioxide; D013718:Tensile Strength; D014867:Water; D015040:Zirconium
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D011109:Polymethacrylic Acids; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; C083568:Z100 composite resin; C444444:prime and bond 2.1; D014867:Water; D000096:Acetone; D012822:Silicon Dioxide; D015040:Zirconium