Journal Article

Long-term skeletal effects of mandibular symphyseal distraction osteogenesis. An implant study

Haluk İşeri and Sıddık Malkoç

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 27, issue 5, pages 512-517
Published in print October 2005 | ISSN: 0141-5387
Published online July 2005 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/cji026
Long-term skeletal effects of mandibular symphyseal distraction osteogenesis. An implant study

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The purpose of this study was to investigate the long-term skeletal effects of mandibular symphyseal distraction osteogenesis (MSDO) with a tooth- and bone-borne distraction device, analysed using the metallic implant method.

The study sample comprised 20 patients between 15.8 and 25 years of age, with a mean age of 20.01 ± 2.25 years at the start of treatment. In 12 subjects, titanium implants were inserted in the mandible to analyse mandibular skeletal changes in the short and long term. A custom-made intraoral, tooth- and bone-borne distractor was designed and used. After a latency period of 7 days, the distractor was activated twice daily, by a total amount of 1 mm. Postero-anterior (PA) cephalograms were obtained at the start of distraction and at the end of consolidation (94.95 ± 5.79 days after surgery) and follow-up periods (21.5 ± 4.6 months after consolidation). The data were analysed statistically using paired t-tests.

The mean amount of screw activation was 8.10 ± 1.68 mm. The inter-symphyseal and inter-molar implant distances and the bimolar width significantly increased during the consolidation period (P < 0.001) and were maintained at the end of the follow-up. On the other hand, the bicondylar width was markedly decreased (P < 0.05), while no significant skeletal changes were observed in bigonion and biantigonion widths, inter-ramal implant distance, or inter-ramal and implant angles at the end of the consolidation period. The long-term findings of this study indicate that MSDO provides an efficient and stable non-extraction treatment alternative, mainly by increasing the anterior mandibular skeletal and dental arches.

Journal Article.  3903 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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