title: Multicenter retrospective analysis of wide-neck dental implants for single molar replacement.
abstract: OBJECTIVE
  To evaluate the predictability of Straumann wide-neck dental implants (6.5-mm prosthetic neck with a 4.8-mm endosseous sandblasted, large-grit, acid-etched-surface body) used for molar replacement.
  
  
  METHODS
  Four hundred ninety-nine single-tooth implants were restored in molar sites in 410 patients (mean time of loading 23 months; range, 1 to 54 months) by 6 clinicians throughout the United States. Three hundred-fifty nine implants were placed in the mandible and 148 implants in the maxilla.
  
  
  RESULTS
  The overall cumulative survival rate was 98.4% for all sites (8 failures). Survival rates of 99.2% for mandibular molars (3 failures) and 96.6% for maxillary molars (5 failures) were achieved. Survival rate of implants placed in conjunction with the bone-added osteotome procedure in the maxillary molars was 89%, with 5 of 45 procedures leading to failure.
  
  
  CONCLUSIONS
  Minimal restorative problems were encountered. No cases of abutment loosening or fractures were observed for cemented restorations on solid abutments.
  
  
  CONCLUSIONS
  The data suggest that the Straumann solid-screw, wide-neck implants can be a satisfactory choice for molar single-tooth replacement.
authors.affiliation: Perio-Prosthesis and Implantology, University of Pennsylvania School of Dental Medicine, USA. levineddspc@aol.com
authors.forename: Robert A
authors.initials: RA
authors.lastname: Levine
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Ganeles
authors.forename: Robert A
authors.initials: RA
authors.lastname: Jaffin
authors.forename: Donald S
authors.initials: DS
authors.lastname: Clem
authors.forename: Jay R
authors.initials: JR
authors.lastname: Beagle
authors.forename: G William
authors.initials: GW
authors.lastname: Keller
mesh_terms: D000134:Acid Etching, Dental; D000293:Adolescent; D000328:Adult; D000368:Aged; D000540:Alveolar Ridge Augmentation; D016025:Bone Transplantation; D002484:Cementation; D000044:Dental Abutments; D045662:Dental Etching; D019250:Dental Implants, Single-Tooth; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D016557:Guided Tissue Regeneration, Periodontal; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000601:surgery; D008875:Middle Aged; D008963:Molar; D010027:Osteotomy / Q000295:instrumentation; D012189:Retrospective Studies; D013499:Surface Properties; D016019:Survival Analysis