title: Cemented Single Crown Retention on Dental Implants: An In Vitro Study.
abstract: OBJECTIVE
  The aim of this study was to determine the influence of selected cements, abutment heights, and aging on the retention of zirconia crowns on zirconia abutments.
  
  
  METHODS
  Zirconia crowns and abutments (height: 4.0 or 5.5 mm) were sandblasted and retained using five different cements. Axial pull-off tests were performed after thermocycling or 3 days of water storage.
  
  
  RESULTS
  An increase in abutment height was associated with an increase in decementation force when permanent cementation was tested. The aging protocol showed that temporarily cemented crowns showed a significant retention decrease, while use of a permanent cement led to a moderate increase.
  
  
  CONCLUSIONS
  Only use of permanent cements ensures clinically adequate decementation forces.
authors.forename: Stefan
authors.initials: S
authors.lastname: Rues
authors.forename: Melissa
authors.initials: M
authors.lastname: Fugina
authors.forename: Peter
authors.initials: P
authors.lastname: Rammelsberg
authors.forename: Stefanie
authors.initials: S
authors.lastname: Kappel
mesh_terms: D003442:Crowns; D000044:Dental Abutments; D003738:Dental Cements; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention / Q000379:methods*; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis; D066298:In Vitro Techniques; D013499:Surface Properties; D015040:Zirconium
chemical_list: D003738:Dental Cements; D015040:Zirconium; C028541:zirconium oxide