title: Selective masking for thin indirect restorations: can the use of opaque resin affect the dentine bond strength of immediately sealed preparations?
abstract: OBJECTIVE
  Evaluate the dentine bond strength using different methods of application of opaque resins to mask dentine discoloration.
  
  
  METHODS
  Dentine was exposed on 21 extracted molars which were assigned to 3 groups: G1: immediate dentine sealing (IDS). G2: IDS+opaque. G3: IDS with adhesive resin mixed with opaque. After 1 week, teeth were restored and beams were fabricated for microtensile testing. Optical microscopy was used to analyse the failure mode.
  
  
  RESULTS
  Bond strength mean values were statistically different: G1 55.20MPa>G2 45.79MPa>G3 18.96MPa. Failure modes were mostly adhesive for G1 and G3. G2 presented mostly mixed failures.
  
  
  CONCLUSIONS
  The use of opaque resin to mask discoloured dentine results in a decrease of bond strength.
authors.affiliation: Don & Sybil Harrington Foundation, Department of Restorative Sciences, Herman Ostrow School of Dentistry, University of Southern California, United States. magne@usc.edu
authors.forename: Pascal
authors.initials: P
authors.lastname: Magne
authors.forename: Maria Paula
authors.initials: MP
authors.lastname: Paranhos
authors.forename: Julia
authors.initials: J
authors.lastname: Hehn
authors.forename: Elisa
authors.initials: E
authors.lastname: Oderich
authors.forename: Luis Leonildo
authors.initials: LL
authors.lastname: Boff
mesh_terms: D000134:Acid Etching, Dental; D003188:Composite Resins; D001840:Dental Bonding; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D006801:Humans; D007284:Inlays; D008422:Materials Testing; D019279:Resin Cements; D013718:Tensile Strength; D014075:Tooth Discoloration / Q000628:therapy
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements