title: Five-year evaluation of Lifecore Restore implants: a retrospective comparison with Nobel Biocare MK II implants.
abstract: OBJECTIVE
  The purpose of this study was to compare survival rates and marginal bone resorption of the Lifecore (LC) Restore Implant System with the benchmark Nobel Biocare (NB) MK II Implant System.
  
  
  METHODS
  All implants were inserted by the same surgeon and all radiological analyses were performed by the same radiologist. Two hundred ninety LC implants were analyzed radiologically after 1 year and compared with the same number of NB implants serving as a historical reference group. After 5 years, 200 LC implants could be compared with 224 NB implants. Each implant was monitored for exposed threads, as compared with the baseline registrations.
  
  
  RESULTS
  No significant differences were found between the two implant systems regarding survival rates (LC 100% and NB 99.2%). Considering the findings of this study, the two implant systems compared might be regarded as clones. Nevertheless, because of dissimilar onset of threads, about 1 mm more implant-retaining bone anchorage is gained with the Lifecore Restore Implants as compared with NB MK II Implants.
  
  
  CONCLUSIONS
  Based on the assumption that >3 exposed NB threads correspond to >4 exposed LC threads, significantly more bone loss (p < .01) could be demonstrated for the NB implants after 5 years. Thus, it may be justified to consider the differences in implant design to have a decisive clinical relevance.
authors.affiliation: Specialist Centre for Dental Implants, Värmdövägen 121, SE-13137 Nacka, Sweden. bessing@specialistkliniken-implantat.se
authors.forename: Thomas
authors.initials: T
authors.lastname: Kallus
authors.forename: Christer
authors.initials: C
authors.lastname: Bessing
authors.forename: George
authors.initials: G
authors.lastname: Homsi
authors.forename: Inger
authors.initials: I
authors.lastname: Eklund
mesh_terms: D016301:Alveolar Bone Loss / Q000209:etiology; D016009:Chi-Square Distribution; D015921:Dental Implants / Q000009:adverse effects; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D006801:Humans; D015993:Life Tables; D008137:Longitudinal Studies; D009066:Mouth, Edentulous / Q000534:rehabilitation; D012189:Retrospective Studies
chemical_list: D015921:Dental Implants