title: Factors associated with dental implant survival: a 4-year retrospective analysis.
abstract: BACKGROUND
  Dental implants are a predictable treatment option for replacing missing teeth and have strong survival and success outcomes. However, previous research showed a wide array of potential risk factors that may have contributed to dental implant failures. The objectives of this study are to study if implant survival rates were affected by known risk factors and risk indicators that may have contributed to implant failures. The secondary outcome measures were whether the level of expertise of the periodontal residents affected success rates and how the rate of implant success at the Harvard School of Dental Medicine (HSDM) compared to published standards.
  
  
  METHODS
  A retrospective chart review of patients at the HSDM who had one of two types of rough-surface implants (group A or B) placed by periodontology residents from 2003 to 2006 was performed. Demographic, health, and implant data were collected and analyzed by multimodel analyses to determine failure rates and any factors that may have increased the likelihood of an implant failure.
  
  
  RESULTS
  The study cohort included 341 dental implants. The odds ratio for an implant failure was most clearly elevated for diabetes (2.59 implant surface group B (7.84), and male groups (4.01). There was no significant difference regarding the resident experience. The success rate for HSDM periodontology residents was 96.48% during the 4-year study period.
  
  
  CONCLUSIONS
  This study demonstrates that implant success rates at HSDM fell within accepted published standards, confirmed previously identified risk factors for a failure, and potentially suggested that other acknowledged risk factors could be controlled for. Furthermore, the level of experience of the periodontology resident did not have an impact on survival outcomes.
authors.affiliation: Department of Oral Medicine, Infection, and Immunity, Division of Periodontology, Harvard School of Dental Medicine, Boston, MA 02115, USA.
authors.forename: Jamie
authors.initials: J
authors.lastname: Zupnik
authors.forename: Soo-woo
authors.initials: SW
authors.lastname: Kim
authors.forename: Daniel
authors.initials: D
authors.lastname: Ravens
authors.forename: Nadeem
authors.initials: N
authors.lastname: Karimbux
authors.forename: Kevin
authors.initials: K
authors.lastname: Guze
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001900:Boston; D002012:Bruxism / Q000150:complications; D002983:Clinical Competence; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure / Q000706:statistics & numerical data; D048909:Diabetes Complications; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D010517:Periodontics / Q000193:education; D016016:Proportional Hazards Models; D012189:Retrospective Studies; D012307:Risk Factors; D012575:Schools, Dental; D012737:Sex Factors; D012907:Smoking / Q000009:adverse effects; D013499:Surface Properties; D055815:Young Adult
chemical_list: D015921:Dental Implants