title: A prospective 5-year study of fixed partial prostheses supported by implants with machined and TiO2-blasted surface.
abstract: OBJECTIVE
  The aim of the present study was to evaluate whether there was a difference between machined and TiO(2)-blasted implants regarding survival rate and marginal bone loss during a 5-year observation period.
  
  
  METHODS
  A total of 133 implants (Astra Tech Dental Implants; Astra Tech AB, Mölndal, Sweden) were placed in 50 patients at 6 centers in 4 Scandinavian countries. Forty-eight implants were installed in the maxilla and 85 implants in the mandible. A randomization and a stratification were done, so that each fixed partial prosthesis was supported by at least 1 machined and 1 TiO(2)-blasted implant. The implant-supported fixed partial prostheses (ISFPP) were fabricated within 2 months after postoperative healing. A total of 52 ISFPP (17 maxillary, 35 mandibular) were inserted. The patients were clinically examined once a year for 5 years. At the annual follow-up, biological as well as technical complications were recorded.
  
  
  RESULTS
  Of the 133 implants placed, 3 were reported as failed after 5 years of follow-up, resulting in an overall cumulative survival rate of 97.6%. The cumulative implant survival rates were 100% for the TiO(2)-blasted implants and 95.1% for the machined implants. No significant difference in survival was, however, found between the machined and TiO(2)-blasted implants after 5 years. The mean marginal bone loss in the maxilla was 0.21 +/- 0.83 mm (SD) for the machined implants and 0.51 +/- 1.11 mm (SD) for the TiO(2)-blasted implants during the 5-year observation period. In the mandible, the mean marginal loss was 0.22 +/- 1.13 mm for the machined implants and 0.52 +/- 1.07 mm for the TiO(2)-blasted implants from baseline to the 5-year examination. No significant difference in marginal bone loss between the 2 surface groups was found during the 5-year observation period.
  
  
  CONCLUSIONS
  The present study shows good 5-year results with small ISFPP in the mandible, as well as in the maxilla. No significant differences were found in failure rate and marginal bone loss around implants with a machined rather than a TiO(2)-blasted surface. J Prosthodont 2001;10:2-7.
authors.affiliation: Department of Prosthetic Dentistry, School of Dentistry, Faculty of Health Sciences, University of Copenhagen, Nørre Alle 20, DK-2200 Copenhagen N, Denmark. klg@odont.ku.dk
authors.forename: K
authors.initials: K
authors.lastname: Gotfredsen
authors.forename: U
authors.initials: U
authors.lastname: Karlsson
mesh_terms: D016301:Alveolar Bone Loss / Q000145:classification; D001672:Biocompatible Materials / Q000737:chemistry; D000044:Dental Abutments; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D003779:Denture Design; D003830:Denture, Partial, Fixed; D005260:Female; D005500:Follow-Up Studies; D005884:Gingival Hemorrhage / Q000145:classification; D006801:Humans; D015993:Life Tables; D008297:Male; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000601:surgery; D008875:Middle Aged; D010518:Periodontitis / Q000145:classification; D011446:Prospective Studies; D013499:Surface Properties; D016019:Survival Analysis; D014025:Titanium / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D015921:Dental Implants; C009495:titanium dioxide; D014025:Titanium