title: Mandibular overdentures: professional time for prosthodontic maintenance during the first year of service using three different implant systems.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the professional time required for the prosthodontic maintenance events of mandibular implant overdentures during the first year of service using three different implant systems (ITI, Steri-Oss, or Southern).
  
  
  METHODS
  Seventy-two mandibular implant overdenture patients were allocated to three equal groups, each treated with a different implant system. Data on prosthodontic maintenance events during the first year were categorized and analyzed according to professional time allocation per procedure.
  
  
  RESULTS
  The total professional time required to perform all the maintenance events ranged between 29.0 and 34.0 hours and did not differ significantly among the three groups, although there were time differences for matrix activation and replacement. When combining the professional time for all maintenance events for the mandibular overdentures alone, or with the opposing maxillary complete dentures, there were no significant differences between groups. For maintenance of the maxillary dentures, there was an unexplained difference between the Southern group and ITI or Steri-Oss groups (P < .05).
  
  
  CONCLUSIONS
  The prosthodontic maintenance for mandibular implant overdentures required on average 72 to 98 minutes of professional time per patient during the first year of service, depending on the system used.
authors.affiliation: Department of Oral Rehabilitation, School of Dentistry, University of Otago, PO Box-647, Dunedin, New Zealand. alan.payne@dent.otago.ac.nz
authors.forename: Gilbert K
authors.initials: GK
authors.lastname: Watson
authors.forename: Alan G T
authors.initials: AG
authors.lastname: Payne
authors.forename: David G
authors.initials: DG
authors.lastname: Purton
authors.forename: W Murray
authors.initials: WM
authors.lastname: Thomson
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015921:Dental Implants; D017269:Dental Prosthesis Repair; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported; D003822:Denture Liners; D003823:Denture Rebasing; D003827:Denture, Complete, Upper; D003828:Denture, Overlay; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible; D008875:Middle Aged; D017755:Prosthesis Fitting; D019233:Retreatment; D013996:Time and Motion Studies; D014016:Tissue Conditioning, Dental
chemical_list: D015921:Dental Implants