title: Short implants with a nanometer-sized CaP surface provided with either a platform-switched or platform-matched abutment connection in the posterior region: a randomized clinical trial.
abstract: OBJECTIVE
  To assess the performance of short nanorough implants (8.5 mm in length) provided with either a platform-matched or a platform-switched implant-abutment connection, placed in the resorbed posterior region of partially dentate patients.
  
  
  METHODS
  A total of 149 implants with a dual-acid surface and a discrete crystalline deposition of nanometer-sized CaP particles, with either a platform-matched (control) or a platform-switched implant-abutment connection (test) were placed (randomly assigned) in 92 patients. Follow-up visits were conducted 1 month and 1 year after placing the implant crown. Outcome measures were implant survival, radiographic peri-implant bone loss, clinical parameters, and patient's satisfaction.
  
  
  RESULTS
  One year after loading, 6 of 76 implants in the control group (survival 92.1%) and 3 of 73 implants in the test group (survival 95.9%) were lost (P = 0.33). Radiographic bone loss around test implants (0.50 ± 0.53 mm) was significantly less than around control implants (0.74 ± 0.61 mm; P < 0.005). With regard to implant survival, clinical parameters, and patient's satisfaction, no significant differences were observed between test and control group.
  
  
  CONCLUSIONS
  For teeth replacements in the resorbed posterior region of partially dentate patients, short implants with a platform-switched implant-abutment connection showed significantly less peri-implant bone loss after 1 year in function, while implant survival, clinical parameters, and patient's satisfaction were independent of the implant-abutment connection design.
authors.affiliation: Department of Oral and Maxillofacial Surgery and Maxillofacial Prosthetics, University Medical Center Groningen and University of Groningen, Groningen, The Netherlands; Department of Fixed and Removable Prosthodontics, Centre for Dentistry and Oral Hygiene, University Medical Center Groningen and University of Groningen, Groningen, The Netherlands.
authors.forename: G
authors.initials: G
authors.lastname: Telleman
authors.forename: H J A
authors.initials: HJ
authors.lastname: Meijer
authors.forename: A
authors.initials: A
authors.lastname: Vissink
authors.forename: G M
authors.initials: GM
authors.lastname: Raghoebar
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging*; D018786:Bone Substitutes; D002130:Calcium Phosphates / Q000737:chemistry*; D000044:Dental Abutments; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D017267:Dental Prosthesis Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D053758:Nanoparticles; D017060:Patient Satisfaction; D010512:Periodontal Index; D011859:Radiography; D013499:Surface Properties; D016896:Treatment Outcome
chemical_list: D018786:Bone Substitutes; D002130:Calcium Phosphates; D015921:Dental Implants