title: Maintenance requirements of implant-supported fixed prostheses opposed by implant-supported fixed prostheses, natural teeth, or complete dentures: a 5-year retrospective study.
abstract: OBJECTIVE
  The purpose of this study was to compare the maintenance requirements of implant-supported fixed prostheses with cantilever arms in edentulous jaws when opposed by fixed prostheses of similar design, by natural teeth, or by complete dentures.
  
  
  METHODS
  The maintenance requirements for the 5-year follow-up period were obtained by examining the dental records of 37 people. Six were provided with fixed prostheses in both arches, 22 with a fixed prosthesis in the mandible opposed by a complete denture, and 9 with a fixed prosthesis opposed by natural teeth. Everyone was treated with Nobel Biocare implants using standard implant and prosthetic protocols.
  
  
  RESULTS
  The denture teeth and acrylic resin were repaired on 44 occasions in the group with implants in both jaws, on 14 occasions in the group with implants opposed by natural teeth, and twice in the group in which the implants were opposed by a complete denture. The group with implants in both jaws was more likely to fracture the gold-alloy framework, which occurred on six occasions. The group with implants in both jaws was significantly different from the other two groups in relation to higher incidence of fracture of the teeth and gold-alloy framework.
  
  
  CONCLUSIONS
  The maintenance requirements of implant-supported fixed prostheses with cantilever arms opposed by fixed prostheses of similar design were much greater than when opposed by natural teeth or complete dentures.
authors.affiliation: Department of Prosthetic Dentistry, GKT Dental Institute, Denmark Hill Campus, Caldecot Road, London SE5 9RW, United Kingdom. david.davis@kcl.ac.uk
authors.forename: David M
authors.initials: DM
authors.lastname: Davis
authors.forename: Mark E
authors.initials: ME
authors.lastname: Packer
authors.forename: Roger M
authors.initials: RM
authors.lastname: Watson
mesh_terms: D000180:Acrylic Resins; D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D000044:Dental Abutments; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D003779:Denture Design; D003780:Denture Repair; D003824:Denture, Complete; D005260:Female; D005500:Follow-Up Studies; D006047:Gold Alloys; D006801:Humans; D007575:Jaw, Edentulous / Q000534:rehabilitation / Q000601:surgery; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D018709:Statistics, Nonparametric; D014070:Tooth / Q000502:physiology*; D014093:Tooth, Artificial
chemical_list: D000180:Acrylic Resins; D015921:Dental Implants; D006047:Gold Alloys