title: Effect of resin cement selection on the microtensile bond strength of adhesively veneered 3Y-TZP.
abstract: OBJECTIVE
  The aim of this study was to investigate the effect of resin cement selection on the microtensile bond strength (μTBS) of adhesively veneered 3Y-TZP.
  
  
  METHODS
  3Y-TZP discs were fabricated from commercial powders and treated by sandblasting and zirconia primer. Porcelain discs were sectioned from a feldspathic block and conditioned with 5% HF and silane agent. Pre-treated surfaces of zirconia and porcelain discs were bonded together using one of the three following resin cements: Multilink N (MN), Panavia F (PA) or RelyX Unicem (RU), respectively. After light-curing the joined discs were cut into microbars where 15 microbars per group were randomly chosen for μTBS test until failure occurred (24 h storage in water in advance, crosshead speed of 0.5 mm/min). The data were analysed by one-way ANOVA and Tukey's test (p < 0.05). Fractured zirconia surfaces were examined using both a stereomicroscope and scanning electron microscope to identify the failure mode.
  
  
  RESULTS
  Significant differences in the μTBS values among three groups were found (p < 0.001) and the descending order was PA, RU and MN. No zirconia or feldspathic failure occurred, but the zirconia/cement interfaces suffered from fracture for all samples. Cement cohesive failure and/or feldspathic/cement interfacial failure sometimes were involved. Failures were mainly adhesive for RU, while they were mixed for MN and PA.
  
  
  CONCLUSIONS
  When using the adhesive veneering method, Panavia F offers better bond strength than Multilink N or RelyX Unicem, which is probably due to the content of the 10-methacryloyloxydecyl dihydrogenphosphate (10-MDP) monomer.
authors.affiliation: Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.forename: Xinzhi
authors.initials: X
authors.lastname: Wang
authors.forename: Wenjie
authors.initials: W
authors.lastname: Si
authors.forename: Zhijian
authors.initials: Z
authors.lastname: Shen
mesh_terms: D000269:Adhesives; D003188:Composite Resins / Q000737:chemistry*; D003738:Dental Cements / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D013052:Spectrometry, X-Ray Emission; D013718:Tensile Strength
chemical_list: D000269:Adhesives; D003188:Composite Resins; D003738:Dental Cements