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Fixed partial prostheses supported by 2 or 3 implants: a retrospective study up to 18 years

Journal article
Authors Alf Eliasson
Torbjörn Eriksson
Anders Johansson
Ann Wennerberg
Published in Int J Oral Maxillofac Implants
Volume 21
Issue 4
Pages 567-74
Publication year 2006
Published at Institute of Odontology
Pages 567-74
Language en
Keywords Adult, Aged, Aged, 80 and over, Alveolar Bone Loss/*radiography, Dental Prosthesis, Implant-Supported/adverse effects/*statistics &, numerical data, *Dental Restoration Failure, Denture, Partial, Fixed/adverse effects/*statistics & numerical data, Female, Humans, Male, Mandibular Diseases/radiography, Maxillary Diseases/radiography, Middle Aged, Patient Satisfaction/statistics & numerical data, Questionnaires, Retrospective Studies, Survival Analysis
Subject categories Biomaterials


PURPOSE: The purpose of this study was to evaluate and compare the long-term performance of fixed partial prostheses supported by 2 or 3 implants. MATERIALS AND METHODS: All patients treated with fixed partial prostheses supported by either 2 or 3 implants during the period 1985 to 1998 were included in this retrospective report. Annual clinical follow-up examinations were performed, with special attention to stability of the prostheses and peri-implant and occlusal conditions. Radiographic examination was performed when the prostheses were delivered (year 0) and subsequently at 1-year, 5-year, and 10-year examinations. RESULTS: A total of 178 patients had received fixed partial prostheses (FPPs) during this period of whom 123 (77 women and 46 men) were available for follow-up (mean age = 65 years, range 32-91). These 123 patients received a total of 146 implant-supported FPPs (63 two-implant- and 83 three-implant-supported) supported by 375 implants. The mean observation periods for the 2- and 3-implant-supported restorations were 9.6 years and 9.4 years (range, 5 to 18 years), respectively. Survival rates for the 2- and 3-implant-supported prostheses were 96.8% and 97.6%, respectively. The implant survival rate after loading was 98.4% for both groups. The mean bone loss at the 5-year follow-up was 0.3 mm for the 2 groups. No significant differences in bone loss (P > .05), implant failure rate (P > .05), or incidence of mechanical complications (P > .05) were found between the 2 prosthesis designs. The complications differed, significantly, with more loose gold and abutment screws in the 2-implant-supported group (P < .05) and more porcelain fractures in the 3-implant-supported group (P < .05). CONCLUSION: The 2-implant-supported partial prostheses exhibited long-term clinical performance comparable to prostheses supported by 3 implants.

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