title: A retrospective study on related factors affecting the survival rate of dental implants.
abstract: OBJECTIVE
  The aim of this retrospective study is to analyze the relationship between local factors and survival rate of dental implant which had been installed and restored in Seoul Veterans Hospital dental center for past 10 years. And when the relationship is found out, it could be helpful to predict the prognosis of dental implants.
  
  
  METHODS
  A retrospective study of patients receiving root-shaped screw-type dental implants placed from January 2000 to December 2009 was conducted. 6385 implants were placed in 3755 patients. The following data were collected from the dental records and radiographs: patient's age, gender, implant type and surface, length, diameter, location of implant placement, bone quality, prosthesis type. The correlations between these data and survival rate were analyzed. Statistical analysis was performed with the use of Kaplan-Meier analysis, Chi-square test and odds ratio.
  
  
  RESULTS
  In all, 6385 implants were placed in 3755 patients (3120 male, 635 female; mean age 65 ± 10.58 years). 108 implants failed and the cumulative survival rate was 96.33%. There were significant differences in age, implant type and surface, length, location and prosthesis type (P<.05). No significant differences were found in relation to the following factors: gender, diameter and bone quality (P>.05).
  
  
  CONCLUSIONS
  Related factors such as age, implant type, length, location and prosthesis type had a significant effect on the implant survival.
authors.affiliation: Department of Prosthodontics, Dental Center, Seoul Veterans Hospital, Korea.
authors.forename: Hee-Won
authors.initials: HW
authors.lastname: Jang
authors.forename: Jeong-Kyung
authors.initials: JK
authors.lastname: Kang
authors.forename: Ki
authors.initials: K
authors.lastname: Lee
authors.forename: Yong-Sang
authors.initials: YS
authors.lastname: Lee
authors.forename: Pil-Kyoo
authors.initials: PK
authors.lastname: Park