title: Five-year results with fixed complete-arch mandibular prostheses supported by 4 implants.
abstract: This study examined whether it is possible to restore an edentulous mandible with a complete-arch fixed prosthesis retained by only 4 implants without decreasing the survival rate. One hundred nineteen patients received complete-arch mandibular prostheses retained by 4 implants. Most patients were followed for 3 years or more. All patients followed a routine protocol, including annual check-ups and regular radiographic examinations. Twenty-one patients dropped out. Radiographic measurements used the threads of the implants as a basis for comparison. No indication was found that the number of supporting implants could have influenced the observed frequency of technical and surgical complications. Three implants were lost, 2 after 1 year and 1 after 5 years. A statistically significant difference in bone loss between the mesial and distal implants was found. The number of fractured resin teeth in mandibular prostheses was higher when patients had an implant-supported prosthesis in the maxilla. The present study revealed an implant survival rate of 98.6% after 5 years. Therefore, it was concluded that there may not be a need for more than 4 implants to support a fixed mandibular prosthesis, when implants at least 10 mm long can be used.
authors.affiliation: Department of Prosthetic Dentistry, Postgraduate Dental Education Center, Orebro, Sweden. alf.eliasson@orebroll.se
authors.forename: A
authors.initials: A
authors.lastname: Eliasson
authors.forename: S
authors.initials: S
authors.lastname: Palmqvist
authors.forename: B
authors.initials: B
authors.lastname: Svenson
authors.forename: K
authors.initials: K
authors.lastname: Sondell
mesh_terms: D000180:Acrylic Resins; D000368:Aged; D000369:Aged, 80 and over; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008334:Mandible; D008875:Middle Aged; D014093:Tooth, Artificial; D016896:Treatment Outcome
chemical_list: D000180:Acrylic Resins