title: Influence of Y-TZP ceramic treatment and different resin cements on bond strength to dentin.
abstract: OBJECTIVE
  Evaluating the bond strength (σ) of resin cement systems (RXA - RelyX ARC; RXU - RelyX U100; and PF - Panavia F) to dentin and yttria-stabilized zirconia-based ceramic (YZ - In-Ceram YZ) after different surface treatments and aging.
  
  
  METHODS
  Occlusal dentin of 54 human molars was exposed and conditioned following manufacturers' instructions. Fifty-four YZ blocks were sintered and divided into two groups according to surface treatment: PA - airborne particle abrasion, and SC - tribochemical silica coating. All treated YZ blocks were cemented to dentin using one of the cement systems (RXA, RXU, and PF) following manufacturers' recommendations, which includes specific silane agents. Teeth-cement-ceramic blocks were stored in 37°C distilled water for 24h before cutting into non-trimming bar-shaped specimens (adhesive area, A=1±0.1mm(2)). Specimens (n≥12) were assigned to one of the following conditions: N - no storage; W - stored in 37°C distilled water for 60days; and TC - thermal cycling (5-55°C; 10,000 cycles). All specimens were loaded in tension (F) to failure using a universal testing machine. The σ (F/A) was calculated and data were statistically analyzed using ANOVA and Tukey tests (α=0.05). Fracture surfaces were examined to determine the failure mode.
  
  
  RESULTS
  RXA-SC and PF-PA specimens showed the greatest mean σ values after N (13.9 and 13.0MPa, respectively) and TC (12.9 and 14.8MPa, respectively). SC-treated showed greater mean σ values than PA-treated YZ specimens after W.
  
  
  CONCLUSIONS
  Regardless of the cement used, W and TC did not significantly reduce the σ of SC-treated YZ resin bonded to dentin.
authors.affiliation: Department of Dental Materials and Prosthodontics, Sao Paulo State University at Sao Jose dos Campos, Brazil.
authors.forename: Humberto L
authors.initials: HL
authors.lastname: de Castro
authors.forename: Pedro H
authors.initials: PH
authors.lastname: Corazza
authors.forename: Tarcísio de A
authors.initials: Tde A
authors.lastname: Paes-Júnior
authors.forename: Alvaro
authors.initials: A
authors.lastname: Della Bona
mesh_terms: D000268:Adhesiveness; D020906:Air Abrasion, Dental; D020099:Coated Materials, Biocompatible; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004356:Drug Storage; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry; D012821:Silanes; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors; D014867:Water; D015019:Yttrium; D015040:Zirconium
chemical_list: D020099:Coated Materials, Biocompatible; D017220:Dentin-Bonding Agents; D019279:Resin Cements; D012821:Silanes; C499362:yttria stabilized tetragonal zirconia; D014867:Water; D015019:Yttrium; D015040:Zirconium