title: Immediately loaded platform-switched implants in the anterior mandible with fixed prostheses: a randomized, split-mouth, masked prospective trial.
abstract: BACKGROUND
  Platform-switched implants have been demonstrated to maintain marginal bone-level stability after immediate loading. The present study evaluated crestal bone loss and soft tissue stability around ANKYLOS plus® implants (A-implants) and Certain® PREVAIL(TM) (B-implants).
  
  
  METHODS
  Patients were identified to receive three A- or three B-implants on each side of their mandibles, with randomization. All implants were loaded immediately after their insertion and splinted with a cemented provisional prosthesis. Final prostheses were delivered 3 months after implantation. Peri-implant crestal bone loss, gingival recession, and other soft tissue changes were evaluated throughout a 2-year follow-up.
  
  
  RESULTS
  A total of one hundred seven implants were placed in 18 patients. Two of the group A-implants and one group B-implant failed. At the final 24-month assessment, bone loss of at least 2 mm (mesially or distally) was recorded at 5 of the 44 surviving A-implants (11%) and 33 of the 47 B-implants (70%), a success rate of 88.63% for the A- and 29.78% for the B-implants.
  
  
  CONCLUSIONS
  Significant changes in the level of the crestal bone loss around immediately loaded platform-switched dental implants seem to be related to the platform shape and size, as well as the implant-abutment connection, when abutments are not removed.
authors.affiliation: Division of Periodontology, Eastman Institute for Oral Health, University of Rochester, Rochester, NY, USA; Division of General Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, NY, USA.
authors.forename: Georgios E
authors.initials: GE
authors.lastname: Romanos
authors.forename: Hans
authors.initials: H
authors.lastname: Malmstrom
authors.forename: Changyong
authors.initials: C
authors.lastname: Feng
authors.forename: Carlo
authors.initials: C
authors.lastname: Ercoli
authors.forename: Jack
authors.initials: J
authors.lastname: Caton
mesh_terms: D016301:Alveolar Bone Loss / Q000145:classification; D059605:Dental Implant-Abutment Design / Q000379:methods*; D015921:Dental Implants; D003774:Dental Plaque Index; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D005889:Gingival Recession / Q000145:classification; D006801:Humans; D057893:Immediate Dental Implant Loading / Q000379:methods*; D007575:Jaw, Edentulous / Q000534:rehabilitation / Q000601:surgery; D008297:Male; D008334:Mandible / Q000601:surgery*; D016348:Osseointegration / Q000502:physiology; D010512:Periodontal Index; D010514:Periodontal Pocket / Q000145:classification; D011446:Prospective Studies; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants
keywords: immediate loading; platform switching