title: A 5-year retrospective clinical study of the Dentium implants.
abstract: OBJECTIVE
  The aim of this retrospective study was to evaluate cumulative survival rate (CSR) of Implantium implants followed for 5 years and association between risk factors and the CSR.
  
  
  METHODS
  A total of two hundred forty-nine Implantium Implants System (Dentium, Seoul, Korea) placed in ninety-five patients from 2004 to 2009 were investigated with several identified risk factors (sex, systemic disease, smoking, alchohol, reason of tooth loss, length, arch (maxilla or mandible), replace tooth type (incisor, canine, premolar or molar) Kennedy classification, prosthodontic type, prosthodontic design, opposite dentition, abutment type, occlusal material, occlusal unit, splint to tooth, cantilever, other surgery). Clinical examination (mobility, percussion, screw loosening, discomfort, etc.) and radiographic examination data were collected from patient records including all problems during follow-up period according to protocols described earlier. Life table analysis was undertaken to examine the CSR. Cox regression method was conducted to assess the association between potential risk factors and overall CSR.
  
  
  RESULTS
  Five of 249 implants were failed. Four of these were lost before loading. The 5-year implant cumulative survival rate was 97.37%. Cox regression analysis demonstrated a significant predictive association between overall CSR and systemic disease, smoking, reason of tooth loss, arch, Kennedy classification and prosthodontic design (P<.05). The screw related complication was rare. Two abutment screw fractures were found. Another complications of prosthetic components were porcelain fracture, resin facing fracture and denture fracture (n=19).
  
  
  CONCLUSIONS
  The 5-year CSR of Implantium implants was 97.37%. Implant survival may be dependent upon systemic disease, smoking reason of tooth loss, arch, Kennedy classification and prosthodontic design (P<.05). The presence of systemic diseases and combination of other surgical procedures may be associated with increased implant failure.
authors.affiliation: Department of Prosthodontics, Institute for Clinical Dental Research, Guro Hospital, Korea University Medical Center, Seoul, Korea.
authors.forename: Jeong-Yol
authors.initials: JY
authors.lastname: Lee
authors.forename: Hyo-Jin
authors.initials: HJ
authors.lastname: Park
authors.forename: Jong-Eun
authors.initials: JE
authors.lastname: Kim
authors.forename: Yong-Geun
authors.initials: YG
authors.lastname: Choi
authors.forename: Young-Soo
authors.initials: YS
authors.lastname: Kim
authors.forename: Jung-Bo
authors.initials: JB
authors.lastname: Huh
authors.forename: Sang-Wan
authors.initials: SW
authors.lastname: Shin