Survival estimates and risk factors for failure with 6 x 5.7-mm implants

Int J Oral Maxillofac Implants. 2005 Nov-Dec;20(6):930-7.


Purpose: Short dental implants facilitate prosthetic restoration in the setting of limited alveolar bone height. The study objectives were to (1) estimate the 1-year survival of Bicon 6 x 5.7-mm implants, (2) compare the 1-year survival of 6 x 5.7-mm implants with that of non-6 x 5.7-mm implants, and (3) identify risk factors associated with implant failure.

Materials and methods: A retrospective cohort study design was used. The sample was composed of patients who had received at least one 6 x 5.7-mm implant. Predictor variables were categorized as demographic, health status, anatomic, implant-specific, prosthetic, perioperative, and reconstructive. The outcome variable was implant failure, defined as explantation. Appropriate descriptive, bivariate, and multivariate survival statistics were computed.

Results: The sample was composed of 35 patients in whom 172 implants had been placed (45 of which were 6 x 5.7-mm). The 1-year survival rates for 6 x 5.7-mm and non-6 x 5.7-mm implants were 92.2% and 95.2%, respectively (P = .76). After adjusting for covariates in a multivariate model, implant size was not associated with failure (P = .95).

Discussion: The comparable survival estimates for 6 x 5.7-mm implants and non-6 x 5.7-mm implants in this study suggested that 6 x 5.7-mm implants can become osseointegrated and bear a functional load after placement.

Conclusions: The survival of 6 x 5.7-mm implants was comparable to that of non-6 x 5.7-mm implants.

Publication types

  • Comparative Study
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Dental Implants*
  • Dental Restoration Failure*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Proportional Hazards Models
  • Retrospective Studies
  • Risk Factors
  • Statistics, Nonparametric
  • Survival Analysis
  • Time Factors


  • Dental Implants