title: Influence of enzymatic and chemical degradation on zirconia resin bond strength after different surface treatments.
abstract: OBJECTIVE
  To investigate the influence of chemical and enzymatic degradation on the stability of zirconia resin bond strength using micro-shear bond strength test.
  
  
  METHODS
  Zirconia discs were airborne particle abraded (SB) or selective infiltration etched (SIE) while no surface treatment served as control. Resin composite (Filtek Z250) microdiscs were bonded to zirconia using self-adhesive universal resin cement (RelyX UniCem). Micro-shear bond strength (microSBS) test was conducted after immersion in the following degrading media: 24 hours and 2 weeks of water storage, and 2 weeks in NaOH, alcohol, or esterase enzyme (n=10).
  
  
  RESULTS
  There was a significant influence of the surface finish (P < 0.001, F=154.5), biodegradation medium (P < 0.001, F=52.9), and their interaction (P < 0.001, F=6.0) on zirconia resin bond strength. In general SIE group revealed the highest microSBS values (8.1 - 34.5 MPa) after degradation in different media, followed by SB group (8.7 - 28.5 MPa), while the control group showed significantly lower bond strength (0.4 - 9 MPa).
authors.affiliation: Department of Dental Materials Science, Academic Center for Dentistry Amsterdam, University of Amsterdam and Vrije University, Amsterdam, The Netherlands. hmirmoha@acta.nl
authors.forename: Hesam
authors.initials: H
authors.lastname: Mirmohammadi
authors.forename: Mostafa N
authors.initials: MN
authors.lastname: Aboushelib
authors.forename: Ziad
authors.initials: Z
authors.lastname: Salameh
authors.forename: Cornelis J
authors.initials: CJ
authors.lastname: Kleverlaan
authors.forename: Albert J
authors.initials: AJ
authors.lastname: Feilzer
mesh_terms: D003188:Composite Resins; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods*; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D004950:Esterases; D000431:Ethanol; D006868:Hydrolysis; D008422:Materials Testing; D019279:Resin Cements; D033081:Shear Strength; D012972:Sodium Hydroxide; D013499:Surface Properties; D014867:Water; D015040:Zirconium
chemical_list: D003188:Composite Resins; C444701:Filtek Z250; C483701:Rely X Unicem; D019279:Resin Cements; D014867:Water; D003776:Dental Porcelain; D000431:Ethanol; D012972:Sodium Hydroxide; D015040:Zirconium; D004950:Esterases; C028541:zirconium oxide