title: Pilot evaluation of four experimental conditioning treatments to improve the bond strength between resin cement and Y-TZP ceramic.
abstract: OBJECTIVE
  This study evaluated the bond strength between resin cement and Y-TZP ceramic (Yttrium-stabilized Tetragonal Zirconia Polycrystalline) submitted to different surface conditionings.
  
  
  METHODS
  Fifty Y-TZP ceramic discs (Ø= 10 mm) were allocated into five groups: Gr1 (control)-no conditioning; Gr2-tribochemical silica coating (30-μm SiO(2)) before sintering; Gr3-air abrasion with 50-μm Al(2)O(3) before sintering; Gr4-air abrasion with 110-μ Al(2)O(3) before sintering; Gr5 - air abrasion with 50-μm Al(2)O(3) after sintering. After specimen preparation, cylinders of composite resin were prepared and immediately cemented onto the ceramic. A shear test was performed.
  
  
  RESULTS
  One-way ANOVA indicated a statistically significant difference among the groups (p= 0.0019). The mean shear bond strengths (MPa) were: Gr1 = 4.7 ± 0.8,(b) Gr2 = 4.6 ± 0.9,(b) Gr3 = 6.4 ± 1.0,(a) Gr4 = 6.5 ± 1.8,(a) Gr5 = 6 ± 1.3(ab) (same superscript letter indicates statistical similarity). Adhesive fracture between the ceramic and resin cement was the most common failure. No complete cohesive fracture at the ceramic or composite cylinders was noted.
  
  
  CONCLUSIONS
  Within the limitations of this study, additional surface treatment with air abrasion before and after sintering provided a significant increase in bond strength. Tribochemical silica coating before sintering was not effective as a surface treatment.
authors.affiliation: Division of Prosthodontics, Department of Oral Science, Alma Mater Studiorum, University of Bologna, Italy.
authors.forename: Carlo
authors.initials: C
authors.lastname: Monaco
authors.forename: Paolo
authors.initials: P
authors.lastname: Cardelli
authors.forename: Roberto
authors.initials: R
authors.lastname: Scotti
authors.forename: Luiz Felipe
authors.initials: LF
authors.lastname: Valandro
mesh_terms: D020906:Air Abrasion, Dental; D001840:Dental Bonding; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D006358:Hot Temperature; D010865:Pilot Projects; D019279:Resin Cements; D033081:Shear Strength; D012822:Silicon Dioxide; D013499:Surface Properties; D015019:Yttrium; D015040:Zirconium
chemical_list: D019279:Resin Cements; C499362:yttria stabilized tetragonal zirconia; D003776:Dental Porcelain; D015019:Yttrium; D012822:Silicon Dioxide; D015040:Zirconium