title: Early loading of machined-surface Brånemark implants in completely edentulous mandibles: healed bone versus fresh extraction sites.
abstract: BACKGROUND
  Restoration of edentulous mandibles with dental implants installed with a two-stage or one-stage surgical approach, yet with delayed loading, is a predictable and successful treatment.
  
  
  OBJECTIVE
  The present prospective study evaluated the success up to 3 years of function of nonroughened machined-surface Brånemark System implants (Nobel Biocare AB, Gothenburg, Sweden) loaded early or immediately with a fixed 12-unit bridge.
  
  
  METHODS
  In total, 184 implants were installed in 36 patients: 30 with healed bone and 6 with some remaining teeth, which were extracted simultaneously with implant installation. The provisional or final prostheses were installed 0 to 52 (mean 18.2) days later.
  
  
  RESULTS
  Thirteen of 184 (7.1%) implants failed within 3 months of loading in 5 of 36 (13.9%) patients: 1 of 153 implants (0.7%) failed in healed bone, and 12 of 31 (39%) failed in fresh extraction sites. This consequently meant a loss of 3 of 36 (8.3%) prostheses, all in the extraction group. No implants were lost during 3 years of functional loading (16 patients, 75 implants). The average marginal bone level measured initially and after 1, 2, and 3 years was 0.8 mm (SD = 0.5), 1.0 mm (SD = 0.4), 1.1 mm (SD = 0.3), and 1.4 mm (SD = 0.5), respectively.
  
  
  CONCLUSIONS
  Four to six Brånemark implants with nonroughened machined titanium surfaces can be loaded early or immediately with cross-arch restorations in healed mandibulary bone, but this cannot be recommended for fresh extraction sites.
authors.affiliation: Center for Periodontology and Implantology Brussels, Brussels, Belgium. hugo.debruyn@glo.be
authors.forename: Hugo
authors.initials: H
authors.lastname: De Bruyn
authors.forename: Bruno
authors.initials: B
authors.lastname: Collaert
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D016301:Alveolar Bone Loss / Q000209:etiology; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D003775:Dental Polishing; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported / Q000009:adverse effects*; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D007575:Jaw, Edentulous / Q000534:rehabilitation* / Q000601:surgery; D008297:Male; D008334:Mandible / Q000601:surgery; D008875:Middle Aged; D016348:Osseointegration; D011446:Prospective Studies; D013997:Time Factors; D020390:Tooth Socket
chemical_list: D015921:Dental Implants