title: Microtensile bond strength of three different veneering porcelain systems to a zirconia core for all ceramic restorations.
abstract: OBJECTIVE
  This study investigated the microtensile bond strength of three different ceramic veneering systems to one type of zirconia substrate.
  
  
  METHODS
  Bilayered zirconia veneer discs were fabricated of a LAVA zirconia core and three different veneering ceramics (VITA VM9, Lava Ceram, Creation ZI) using a conventional layering technique. Discs were cut into microbars of 6 mm x 1 mm x 1 mm. Microtensile bond strength between veneer and core was measured. Surfaces of fractured specimens were examined with scanning electron microscopy (SEM).
  
  
  RESULTS
  The mean microtensile bond strengths were respectively VITA VM9 23.52 MPa (8.33), Creation ZI 18.35 MPa (6.40), and Lava Ceram 14.76 MPa (4.00). The differences were statistically significant. Failures were mainly interfacial in all tested groups.
authors.affiliation: Dental Materials Department, University of Siena, Italy. fazi_90211@yahoo.com
authors.forename: Giovanni
authors.initials: G
authors.lastname: Fazi
authors.forename: Alessandro
authors.initials: A
authors.lastname: Vichi
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
mesh_terms: D003442:Crowns; D001840:Dental Bonding; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D003801:Dental Veneers; D008422:Materials Testing; D013718:Tensile Strength; D015040:Zirconium
chemical_list: D003776:Dental Porcelain; D015040:Zirconium; C028541:zirconium oxide