title: Retention of implant-supported zirconium oxide ceramic restorations using different luting agents.
abstract: OBJECTIVE
  The aim of this study was to evaluate the retention value of implant-supported zirconium oxide ceramic copings using different luting agents.
  
  
  METHODS
  Twenty ITI solid abutments of 5.5 mm height and ITI implant analogs were mounted vertically into autopolymerizing acrylic resin blocks. Ninety zirconium oxide copings (Cercon, Degudent) with a loop on the occlusal portion were made. All samples were airborne particle abraded with 110 μm Al₂O₃ and luted using different types of luting agents: resin cements (Clearfil SA, Panavia F2.0, Fuji Plus), conventional cements (Fleck's, Poly F, Fuji I), and temporary cements (Temp Bond, GC free eugenol, TempSpan) with a load of 5 Kg. (N = 10) All copings were incubated at 37°C for 24 h and conditioned in artificial saliva for 1 week, and thermal cycled for 5000 cycles 5-55°C with a 30-s dwell time. The dislodging force of the copings along the long axis of the implant-abutment complex was recorded using universal testing machine with 5 mm/min crosshead speed. Data were subjected to Kruskal-Wallis (α = 0.05) and Mann-Whitney tests with Bonferroni step down correction (α = 0.001).
  
  
  RESULTS
  There was significant difference between the mean rank retention values of different luting agents (P < 0.001). The resin cements showed the highest retention (Clearfil SA, 203.49 ± 52.86; Fuji Plus, 190.61 ± 48.00; Panavia F 2.0, 172.16 ± 70.76 N). The conventional cements had more retention than the temporary cements and glass ionomer cement (P < 0.001).
  
  
  CONCLUSIONS
  The retention of zircona ceramic restorations, over ITI solid abutments may be influenced by the type of cement. The application of an MDP-containing resin and resin-modified glass ionomer luting agents increase the retentive value of implant-supported zirconium oxide restorations.
authors.affiliation: Department of Prosthodontics and Torabinejad Dental Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Farahnaz
authors.initials: F
authors.lastname: Nejatidanesh
authors.forename: Omid
authors.initials: O
authors.lastname: Savabi
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Shahtoosi
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D000044:Dental Abutments; D003738:Dental Cements / Q000737:chemistry*; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis; D005054:Eugenol / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry; D011076:Polycarboxylate Cement / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry; D015036:Zinc Phosphate Cement / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry*
chemical_list: C581302:Clearfil SA; D003738:Dental Cements; C061504:Flecks; D005899:Glass Ionomer Cements; C438843:Panavia-Fluoro; D011076:Polycarboxylate Cement; D019279:Resin Cements; C074319:GC Lining Cement; C084541:Fuji glass-ionomer lining cement; D005054:Eugenol; C029881:Poly F cement; C076899:Temp-Bond; D015036:Zinc Phosphate Cement; D015040:Zirconium; C028541:zirconium oxide; D015034:Zinc Oxide