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Early Loading of Machined‐Surf ace Brånemark Implants in Completely Edentulous Mandibles: Healed Bone versus Fresh Extraction Sites
Author(s) -
Bruyn Hugo,
Collaert Bruno
Publication year - 2002
Publication title -
clinical implant dentistry and related research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.338
H-Index - 85
eISSN - 1708-8208
pISSN - 1523-0899
DOI - 10.1111/j.1708-8208.2002.tb00164.x
Subject(s) - extraction (chemistry) , dentistry , medicine , orthodontics , chemistry , chromatography
Background : Restoration of edentulous mandibles with dental implants installed with a two‐stage or one‐stage surgical approach, yet with delayed loading, is a predictable and successful treatment. Purpose : The present prospective study evaluated the success up to 3 years of function of nonroughened machined‐surface Brånemark System implants (Nobel Biocare AB, Gothenburg, Sweden) loaded early or immediately with a fixed 12‐unit bridge. Materials and Methods : In total, 184 implants were installed in 36 patients:30 with healed bone and 6 with some remaining teeth, which were extracted simultaneously with implant installation. The provisional or final prostheses were installed 0 to 52 (mean 18.2) days later. Results : Thirteen of 184 (7.1%) implants failed within 3 months of loading in 5 of 36 (13.9%) patients:1 of 153 implants (0.7%) failed in healed bone, and 12 of 31 (39%) failed in fresh extraction sites. This consequently meant a loss of 3 of 36 (8.3%) prostheses, all in the extraction group. No implants were lost during 3 years of functional loading (16 patients, 75 implants). The average marginal bone level measured initially and after 1, 2, and 3 years was 0.8 mm (SD = 0.5), 1.0 mm (SD = 0.4), 1.1 mm (SD = 0.3), and 1.4 mm (SD = 0.5), respectively. Conclusions : Four to six Brånemark implants with nonroughened machined titanium surfaces can be loaded early or immediately with cross‐arch restorations in healed mandibulary bone, but this cannot be recommended for fresh extraction sites.