title: Effect of surface treatments on the resin bond to zirconium-based ceramic.
abstract: OBJECTIVE
  This study tested the hypothesis that the tribochemical silica coating on ceramic surfaces increases the bond strength of resin cement to a glass-infiltrated zirconium-based ceramic.
  
  
  METHODS
  Fifteen blocks of In-Ceram Zirconia from CEREC InLab (5 per group) and 15 composite blocks (Z-250) 5 mm x 5 mm x 4 mm were made. The ceramic surfaces were polished, and the blocks were divided into three groups: (1) airborne abrasion with 110-microm aluminum oxide particles; (2) Rocatec system, tribochemical silica coating; and (3) CoJet system, tribochemical silica coating. The ceramic blocks were cemented to the composite blocks using Panavia F according to the manufacturer's specifications. All samples were stored in 37 degrees C distilled water for 7 days and later sectioned in two axes using a diamond disk under cooling to obtain specimens with a cross-sectional area of approximately 1 mm2 (n = 45). Each specimen was then attached with cyanoacrylate glue to an adapted device for the microtensile test, which was carried out on a universal testing machine.
  
  
  RESULTS
  The results were subjected to ANOVA and Tukey's test. Group 2 (23.0+/-6.7 MPa) and group 3 (26.8+/-7.4 MPa) showed greater bond strength than group 1 (15.1+/-5.3 MPa). There was no significant difference between groups 2 and 3. All failures were in the adhesive zone.
  
  
  CONCLUSIONS
  The hypothesis was confirmed--the tribochemical systems increased the bond strength between Panavia F and In-Ceram Zirconia.
authors.affiliation: Department of Dental Materials and Prosthodontics, School of Dentistry, São Paulo State University at São José dos Campos (UNESP), São José dos Campos CEP 12245-000, Brazil. mmbottino@uol.com.br
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: Bottino
authors.forename: Luiz Felipe
authors.initials: LF
authors.lastname: Valandro
authors.forename: Roberto
authors.initials: R
authors.lastname: Scotti
authors.forename: Leonardo
authors.initials: L
authors.lastname: Buso
mesh_terms: D020906:Air Abrasion, Dental; D000537:Aluminum Oxide; D000704:Analysis of Variance; D003188:Composite Resins; D001840:Dental Bonding; D003738:Dental Cements; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D017276:Friction; D008422:Materials Testing; D019279:Resin Cements; D012822:Silicon Dioxide; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D003188:Composite Resins; D003738:Dental Cements; C444701:Filtek Z250; C485633:In-Ceram Zirconia; C438843:Panavia-Fluoro; D019279:Resin Cements; C076811:Rocatec; D003776:Dental Porcelain; D012822:Silicon Dioxide; D000537:Aluminum Oxide