title: Effects of Different Demineralization-Inhibiting Methods on the Shear Bond Strength of Glass-Ceramics.
abstract: OBJECTIVE
  This in vitro study was undertaken to evaluate the effects of different demineralization-inhibiting methods on the shear bond strength (SBS) of glass-ceramics.
  
  
  METHODS
  Ninety extracted intact human mandibular lateral insicors were randomly divided into six equal groups. Group C was left untreated, while enamel subsurface demineralization was induced in the other groups. In group D, porcelain discs (3 mm in diameter) were cemented to demineralized enamel by using total-etch photopolymerizing luting composite resin without pretreatment. Demineralized specimens in groups F, CA, M, and I were pretreated with fluoride gel, CPP-ACP paste, microabrasion, and resin infiltration, respectively, and then porcelain discs were cemented. SBS (MPa) was calculated from the failure load (N) per bonded area (mm(2)). Fracture types were examined by optical microscopy (40× magnification). Data were analyzed with ANOVA, Tukey's test, and G-test.
  
  
  RESULTS
  ANOVA revealed significant intergroup differences (p < 0.01). No significant differences in SBS (MPa) were found between groups C (19.48 ± 2.0) and I (20.02 ± 1.6). Lower SBS values were recorded in groups D (7.93 ± 0.8), F (12.51 ± 1.5), CA (17.08 ± 1.3), and M (14.84 ± 1.4). Mixed and cohesive failures were the most prevalent in groups M and I, respectively.
  
  
  CONCLUSIONS
  Resin infiltration enhanced the SBS of porcelain discs bonded to demineralized enamel when compared with the other demineralization-inhibiting methods.
  
  
  CONCLUSIONS
  Resin infiltration could be useful to enhance adhesion of glass-ceramics to teeth with white spot lesions.
authors.affiliation: Department of Prosthodontics, Sifa University, Faculty of Dentistry, Izmir, Turkey.
authors.forename: Erhan
authors.initials: E
authors.lastname: Dilber
authors.affiliation: Department of Orthodontics, Selcuk University, Faculty of Dentistry, Konya, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Akın
authors.affiliation: Department of Prosthodontics, Abant Izzet Baysal University, Faculty of Dentistry, Bolu, Turkey.
authors.forename: Tevfik
authors.initials: T
authors.lastname: Yavuz
authors.affiliation: Department of Prosthodontics, Sifa University, Faculty of Dentistry, Izmir, Turkey.
authors.forename: Ali
authors.initials: A
authors.lastname: Erdem
mesh_terms: D002516:Ceramics; D001840:Dental Bonding; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D006801:Humans; D008422:Materials Testing; D019279:Resin Cements; D033081:Shear Strength; D013499:Surface Properties
chemical_list: D019279:Resin Cements; D003776:Dental Porcelain
keywords: Casein phosphopeptide-amorphous calcium phosphate; demineralization; glass-ceramic; infiltrant; microabrasion; shear bond strength