title: A 5-year prospective clinical study of Astra Tech dental implants supporting fixed bridges or overdentures in the edentulous mandible.
abstract: In a 5-year prospective clinical study, 155 endosseous implants were installed in the mandible anterior to the mental foramina in 33 edentulous patients (13 males and 20 females). Usually 6 implants were installed for fixed prostheses (FP), 13 patients with 77 implants, and 4 implants for overdentures (OD) with a Dolder bar, 20 patients with 78 implants. At the time of abutment connection 1 implant in 2 patients was found to be loose and removed. However, in both these patients overdentures were successfully placed on the remaining 3 implants. Narrow-beam radiography was used for radiological evaluation. The mean (SD) total marginal bone loss in 5 years was 0.48 (0.38) mm (0.36 (0.22) mm in the FP group and 0.56 (0.45) mm in the OD group). Very few complications were reported during the 5 years, most of them being related to the superstructures. The overall cumulative implant survival rate was 98.7% (100% in the FP group and 97.4% in the OD group). The survival rate of the superstructures was 100%. The present study has demonstrated that Astra Tech implants offer reliable and predictable medium-term support for fixed prostheses and overdentures in the edentulous mandible.
authors.affiliation: Department of Oral and Maxillofacial Surgery, University of Turku, Finland.
authors.forename: T A
authors.initials: TA
authors.lastname: Makkonen
authors.forename: S
authors.initials: S
authors.lastname: Holmberg
authors.forename: L
authors.initials: L
authors.lastname: Niemi
authors.forename: C
authors.initials: C
authors.lastname: Olsson
authors.forename: T
authors.initials: T
authors.lastname: Tammisalo
authors.forename: J
authors.initials: J
authors.lastname: Peltola
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging; D003758:Dental Implantation, Endosseous / Q000295:instrumentation; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported / Q000295:instrumentation; D003779:Denture Design / Q000379:methods; D003828:Denture, Overlay; D003830:Denture, Partial, Fixed; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007575:Jaw, Edentulous / Q000000981:diagnostic imaging / Q000534:rehabilitation*; D008297:Male; D008334:Mandible; D008875:Middle Aged; D011446:Prospective Studies; D011859:Radiography; D014025:Titanium
chemical_list: D015921:Dental Implants; D014025:Titanium