title: Retention of luting agents on implant abutments of different height and taper.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the retention of four cements used to lute metal restorations onto computer designed and manufactured titanium implant abutments of different heights and convergence angles.
  
  
  METHODS
  Test specimens consisted of metal coping cemented on Procera titanium abutments of 5, 7, and 9 mm of height, and of 0 degrees , 4 degrees , and 8 degrees of convergence angle. The cements used were zinc-phosphate, zinc oxide-eugenole, polyurethane resin with and without vaseline. The samples were tested in a universal testing machine. The mean uniaxial load at point of separation was determined. The results were statistically evaluated with ANOVA.
  
  
  RESULTS
  The luting agent, the height, and the taper influence the retention of metal casting on customized CAD-CAM implant abutments.
  
  
  CONCLUSIONS
  The most retentive cement was zinc-phosphate, followed by polyurethane, polyurethane plus vaseline, and zinc oxide-eugenol.
authors.affiliation: Department of Prosthodontics, University of Turin, Turin, Italy.
authors.forename: Mario
authors.initials: M
authors.lastname: Bresciano
authors.forename: Gianmario
authors.initials: G
authors.lastname: Schierano
authors.forename: Carlo
authors.initials: C
authors.lastname: Manzella
authors.forename: Antonio
authors.initials: A
authors.lastname: Screti
authors.forename: Cristina
authors.initials: C
authors.lastname: Bignardi
authors.forename: Giulio
authors.initials: G
authors.lastname: Preti
mesh_terms: D000704:Analysis of Variance; D000044:Dental Abutments; D003738:Dental Cements / Q000737:chemistry*; D015921:Dental Implants; D017268:Dental Prosthesis Retention
chemical_list: D003738:Dental Cements; D015921:Dental Implants