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Turned Brånemark System R implants in wide and narrow edentulous maxillae: A retrospecitve clinical study

Journal article
Authors Bertil Friberg
Torsten Jemt
Published in Clinical Implant Dentistry and Related Research
Volume 10
Issue 2
Pages 78-85
ISSN 1708-8208
Publication year 2008
Published at Institute of Odontology
Pages 78-85
Language en
Keywords turned Brånemark System implants, edentulous maxillae, retrospective clinical study
Subject categories Surgical research, Oral prosthetics


Background: The available jaw bone volume is regarded one most important factor when assessing the prognosis of oral implants in the rehabilitation of the edentulous maxilla. Purpose: The aim of the current investigation was to retrospectively evaluate and compare the outcome of implants placed in edentulous maxillae with either wide or narrow jaw shapes. The marginal bone loss and implant cumulative survival rates (CSRs) were calculated and analyzed with special reference to smoking habits. Materials and Methods: The study included 75 individuals with edentulous maxillae, of which 33 patients exhibited wide (Group A) and 42 patients exhibited narrow jaw shapes (Group B). A total of 506 turned Brånemark System R implants were inserted (226 in Group A and 279 in Group B) and followed clinically up to 7 years. Smoking habits were recorded. Radiographs were obtained at connection of prostheses and at the 1- and 5-year follow-up visit. The marginal bone loss was calculated for the groups and analyzed using Student's t-test. Results: Twenty-eight implants were lost during the study period, revealing implant cumulative survival rates at 7 years of 94.6% (11/226) and 93.6% (17/279) for wide and narrow crests, respectively. No difference in marginal bone loss was seen between the two groups, although a trend towards more bone loss was recorded for patients with wide crests. Smoking habits were more common in Group A (45%) than in Group B (31%). During the first year of function smokers lost significantly more marginal bone than non-smokers (p=0.0447), albeit this difference did not prevail (p>0.05) at the end of the study period. Conclusions: The implant cumulative survival rates at 7 years were equally good for the two groups of patients with various jaw shapes. Initially smokers showed significantly more marginal bone loss than non-smokers.

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