title: Effect of dentin-cleaning techniques on the shear bond strength of self-adhesive resin luting cement to dentin.
abstract: OBJECTIVE
  This in vitro study evaluated the influence of different cleansing techniques on the bond strength of self-adhesive cement to dentin.
  
  
  METHODS
  A total of 33 noncarious human molars were sectioned mesiodistally and embedded in chemically cured resin with the buccal or lingual surfaces facing upward. Superficial dentin was exposed and resin disk provisional restorations were cemented to the dentin surfaces with noneugenol provisional cement and were stored in distilled water at 37°C. After seven days, the provisional restorations were removed and 13 specimens were randomly assigned to each of the five groups (n=13), according to the following cleansing treatments: G1-excavator (control); G2-0.12% chlorhexidine digluconate; G3-40% polyacrylic acid; G4-mixture of flour pumice and water; and G5-sandblasting with 50 μm aluminum oxide particles at a pressure of 87 psi. Resin composite disks (Filtek Supreme Plus, 3M ESPE Dental Products, St Paul, MN, USA) 4.7 (±0.1) mm in diameter and 3.0 (±0.5) mm in height were cemented with self-adhesive cement (RelyX Unicem, 3M ESPE), photocured, and stored in distilled water at 37°C for 24 hours. Shear bond strength testing was conducted using a universal test machine at a crosshead speed of 0.5 mm/min until failure.
  
  
  RESULTS
  Data were analyzed using analysis of variance (ANOVA) and the Tukey-B rank order test. Sandblasting with aluminum oxide (11.32 ± 1.70 MPa) produced significantly higher shear bond strength values compared with any other treatment groups (p<0.05). No significant differences were found between G1-control (7.74 ± 1.72 MPa), G2-chlorhexidine (6.37 ± 1.47 MPa), and G4-pumice (7.33 ± 2.85 MPa) (p<0.05).
authors.affiliation: Restorative Dentistry, The University of Western Ontario, Schulich School of Medicine & Dentistry, London, Ontario, Canada. jacinta.santos@schulich.uwo.ca
authors.forename: M J M C
authors.initials: MJ
authors.lastname: Santos
authors.forename: H
authors.initials: H
authors.lastname: Bapoo
authors.forename: A S
authors.initials: AS
authors.lastname: Rizkalla
authors.forename: G C
authors.initials: GC
authors.lastname: Santos
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry; D002484:Cementation; D002710:Chlorhexidine / Q000031:analogs & derivatives / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D045662:Dental Etching / Q000295:instrumentation / Q000379:methods*; D003794:Dental Restoration, Temporary; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D011312:Pressure; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D017640:Silicates / Q000737:chemistry; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D003738:Dental Cements; D017220:Dentin-Bonding Agents; C515951:Filtek Supreme Plus; C483701:Rely X Unicem; D019279:Resin Cements; D017640:Silicates; C474196:Tempbond NE; D014867:Water; C006903:carbopol 940; D000537:Aluminum Oxide; C010882:chlorhexidine gluconate; C005144:pumice; D002710:Chlorhexidine; D015034:Zinc Oxide