title: A split-mouth comparative study up to 16 years of two screw-shaped titanium implant systems.
abstract: BACKGROUND
  Many studies have dealt with the clinical outcome of oral implants, yet none applied a randomized split-mouth design for a long-term follow-up of similar implant systems.
  
  
  OBJECTIVE
  To evaluate two oral implant systems with different surface characteristics in a randomized split-mouth design and to radiologically analyse peri-implant bone level and density over an up to 16-year period.
  
  
  METHODS
  The study comprised clinical and radiographic records of 18 partially edentulous patients treated with both implant types randomly placed in either left or right jaw sides. Outcome was evaluated over time.
  
  
  RESULTS
  Clinical and radiographic parameters showed no significant differences over time for both systems. Ten years after implant placement, a significantly increasing peri-implant bone density was noted, while Periotest values were found to be significantly decreasing. Fifteen years after implant loading, mean bone loss was 0.02 mm (range -1.15 to 1.51; SD 0.45) for Astra Tech® implants (n=24) and 0.31 mm (range -0.98 to 2.31; SD 0.69) for Brånemark® implants (n=23).
  
  
  CONCLUSIONS
  The study failed to demonstrate significant differences in the outcome of the peri-implant bone for two implant systems with different surface characteristics. The marginal bone level around oral implants changed <0.5 mm after 15 years of loading.
authors.affiliation: Oral Imaging Center, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium. reinhilde.jacobs@med.kuleuven.be
authors.forename: Reinhilde
authors.initials: R
authors.lastname: Jacobs
authors.forename: Pisha
authors.initials: P
authors.lastname: Pittayapat
authors.forename: Daniel
authors.initials: D
authors.lastname: van Steenberghe
authors.forename: Greet
authors.initials: G
authors.lastname: De Mars
authors.forename: Frieda
authors.initials: F
authors.lastname: Gijbels
authors.forename: Annelies
authors.initials: A
authors.lastname: Van Der Donck
authors.forename: Limin
authors.initials: L
authors.lastname: Li
authors.forename: Xin
authors.initials: X
authors.lastname: Liang
authors.forename: Nele
authors.initials: N
authors.lastname: Van Assche
authors.forename: Marc
authors.initials: M
authors.lastname: Quirynen
authors.forename: Ignace
authors.initials: I
authors.lastname: Naert
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000145:classification / Q000000981:diagnostic imaging; D000539:Alveolar Process / Q000000981:diagnostic imaging; D015519:Bone Density / Q000502:physiology; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D000044:Dental Abutments; D015921:Dental Implants; D003764:Dental Materials / Q000737:chemistry*; D003774:Dental Plaque Index; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D003830:Denture, Partial, Fixed; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007576:Jaw, Edentulous, Partially / Q000534:rehabilitation / Q000601:surgery; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D016348:Osseointegration / Q000502:physiology; D010514:Periodontal Pocket / Q000145:classification; D011446:Prospective Studies; D011859:Radiography; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D016896:Treatment Outcome
chemical_list: D020099:Coated Materials, Biocompatible; D015921:Dental Implants; D003764:Dental Materials; C009495:titanium dioxide; D014025:Titanium