title: The seven-year cumulative survival rate of Osstem implants.
abstract: OBJECTIVE
  This study was performed to analyze the cumulative survival rate of Osstem implants (Osstem Implant Co., Ltd.) over a seven-year period.
  
  
  METHODS
  A total of 105 patients who had 467 Osstem implants that were placed at the Section of Dentistry, Seoul National University Bundang Hospital (Seongnam, Korea) from June 2003 through December 2005 were analyzed. The life table method and a cross-tabulation analysis were performed to evaluate the cumulative survival rate. The log rank test was used to evaluate the survival curve. The influence that the prognostic factors had on the survival rate was determined with a Cox proportional hazard model based on logistic regression analysis [corrected].
  
  
  RESULTS
  The seven-year cumulative survival rate of Osstem implants was 95.37%. The Cox proportional hazard model revealed that the following factors had a significant influence on survival rate; increased diameter, reduced prosthetic loading period and performance of bone grafting.
  
  
  CONCLUSIONS
  The osstem implants showed satisfactory results over the seven-year study period.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Young-Kyun
authors.initials: YK
authors.lastname: Kim
authors.affiliation: Department of Oral and Maxillofacial Surgery, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Bum-Su
authors.initials: BS
authors.lastname: Kim
authors.affiliation: Department of Oral and Maxillofacial Surgery, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Pil-Young
authors.initials: PY
authors.lastname: Yun
authors.affiliation: Department of Orthodontics, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Sang-Un
authors.initials: SU
authors.lastname: Mun
authors.affiliation: Department of Prosthodontics, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Yang-Jin
authors.initials: YJ
authors.lastname: Yi
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dentistry, Chosun University, Gwangju, Korea.
authors.forename: Su-Gwan
authors.initials: SG
authors.lastname: Kim
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dentistry, Chosun University, Gwangju, Korea.
authors.forename: Kyung-In
authors.initials: KI
authors.lastname: Jeong
keywords: Dental implants; Survival rate