title: [Clinical observation of screw and cement-retained implant-supported restoration of fixed bridges].
abstract: OBJECTIVE
  To compare the prosthetic outcome of screw- and cement-retained implant-supported restorations of the fixed bridges.
  
  
  METHODS
  A total of 185 Straumann implants were placed in the alveolar bone of 68 partially edentulous patients from Jan. 2006 to Dec. 2007. All of them were 2 to 6 units of combination crowns with Straumann system. Then they were followed up for 3 years. In each group, the retention, influence on hard and soft tissues, passive fitting and rupture strength of the ceramic layer were evaluated. The data was analyzed with SPSS12.0 software package.
  
  
  RESULTS
  There were more advantages of retention and the rupture strength of the ceramic layer in the cement-retained group, while there was less influence on the hard and soft tissues, and more facility of maintenance and reparation in the screwed-retained group. The difference between the two groups was statistically not significant (P>0.05).
  
  
  CONCLUSIONS
  The clinical outcomes of implant restorations are satisfactory, either screw-retained or cement-retained. Cement retention is used in 2 to 3 unit combination crowns, while screw retention is more suitable for complicated cases.
authors.affiliation: Department of Stomatology, Shanghai Xuhui Dental Diseases Centre. Shanghai 200032, China. songtao21@139.com
authors.forename: Tao
authors.initials: T
authors.lastname: Song
authors.forename: Pei-cheng
authors.initials: PC
authors.lastname: Xu
authors.forename: Yu
authors.initials: Y
authors.lastname: Li
mesh_terms: D002484:Cementation; D003442:Crowns; D003738:Dental Cements; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D003830:Denture, Partial, Fixed; D005899:Glass Ionomer Cements; D006801:Humans; D016876:Metal Ceramic Alloys
chemical_list: D003738:Dental Cements; D005899:Glass Ionomer Cements; D016876:Metal Ceramic Alloys