title: The effect of resin infiltration and oxidative pre-treatment on microshear bond strength of resin composite to hypomineralised enamel.
abstract: BACKGROUND
  Reduced bond strengths of resin composites to hypomineralised enamel increase restorative failure.
  
  
  OBJECTIVE
  To investigate if the adhesion of resin composite to hypomineralised enamel can be improved by pre-treatments: resin infiltration, oxidative pre-treatment followed by a resin infiltration, or oxidative pre-treatment.
  
  
  METHODS
  Twenty-one enamel specimens in each of five Groups: 1) Normal enamel; 2) Hypomineralised enamel; 3) Hypomineralised enamel pre-treated with a resin infiltrant, (Icon(®)); 4) Hypomineralised enamel pre-treated with 5.25% sodium hypochlorite then treatment with resin infiltrant; 5) Hypomineralised enamel pre-treated with 5.25% sodium hypochlorite. A resin composite rod was bonded to each specimen using Clearfil™ SE bond as the adhesive (hereafter termed 'routine bonding'), then subjected to microshear bond strength (MSBS) testing.
  
  
  RESULTS
  Overall, the mean MSBS between the five groups differed significantly (P = 0.001). Pre-treatment of hypomineralised enamel with 5.25% sodium hypochlorite with or without subsequent resin infiltration in Groups 4 and 5 prior to routine bonding resulted in increased mean MSBS compared to Groups 2 and 3, with mean MSBS values not differing significantly when compared to routine bonding to normal enamel.
  
  
  CONCLUSIONS
  Increased bond strength of resin composite to hypomineralised enamel was obtained by pre-treatment of hypomineralised enamel specimens with 5.25% sodium hypochlorite with or without subsequent resin infiltration.
authors.affiliation: Melbourne Dental School, The University of Melbourne, Parkville, Vic., Australia; KK Women's and Children's Hospital, Singapore, Singapore.
authors.forename: Pui Ling
authors.initials: PL
authors.lastname: Chay
authors.forename: David J
authors.initials: DJ
authors.lastname: Manton
authors.forename: Joseph E A
authors.initials: JE
authors.lastname: Palamara
mesh_terms: D003188:Composite Resins; D001840:Dental Bonding; D003743:Dental Enamel; D006801:Humans; D010084:Oxidation-Reduction; D033081:Shear Strength; D012973:Sodium Hypochlorite / Q000008:administration & dosage*; D017001:Tooth Demineralization
chemical_list: D003188:Composite Resins; D012973:Sodium Hypochlorite