Posterior implant single-tooth replacement and status of adjacent teeth during a 10-year period: a retrospective report

J Periodontol. 2008 Dec;79(12):2378-82. doi: 10.1902/jop.2008.080188.


Background: The purpose of this case series study was to evaluate posterior single-tooth implant survival and the long-term conditions of the adjacent teeth.

Methods: A retrospective evaluation of 1,162 consecutive patients with a single missing posterior tooth treated with 1,377 external hex implants supporting 1,365 restorations surrounded by natural teeth over a 1- to 10-year period was reviewed from four private offices. Implant survival data were collected relative to stage I to stage II healing, stage II to prosthesis delivery, and prosthesis delivery to up to 10 years of follow-up. Long-term adjacent tooth conditions were assessed, including decay, endodontic therapy (root canal therapy [RCT]), and/or extraction during the follow-up period.

Results: Of the 1,377 implants inserted, there were 11 surgical failures from stage I to stage II healing. There was one failure from stage II healing to prosthesis delivery. There were two prosthetic-phase failures. The surgical success rate was 99.2%, whereas the overall survival rate was 98.9% at an average of 61 months of follow-up (range, 12 to 125 months). A total of 2,589 adjacent teeth were followed during the study. No natural adjacent tooth was lost during this period. Interproximal decay developed in 129 adjacent teeth (5%), and nine adjacent teeth required RCT (0.4%) as a result of decay or restoration.

Conclusions: The use of single-tooth implants as replacements for posterior missing teeth is a viable long-term treatment. Adjacent natural teeth complications are minimal for as long as 10 years after implant insertion.

Publication types

  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Bone Density / physiology
  • Dental Abutments
  • Dental Caries / etiology
  • Dental Implants, Single-Tooth / statistics & numerical data*
  • Dental Prosthesis Design
  • Dental Prosthesis, Implant-Supported
  • Dental Restoration Failure
  • Dental Restoration, Permanent / statistics & numerical data
  • Female
  • Follow-Up Studies
  • Humans
  • Longitudinal Studies
  • Male
  • Middle Aged
  • Osseointegration / physiology
  • Retrospective Studies
  • Root Canal Therapy / statistics & numerical data
  • Survival Analysis
  • Tooth / pathology*
  • Tooth Extraction / statistics & numerical data
  • Treatment Outcome
  • Wound Healing / physiology
  • Young Adult