下がく枝矢状分割後の固定用ピンについて

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  • Pin for the fixation of mandible in sagittal splitting osteotomy

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At present, sagittal splitting osteotomy is being used widely in surgical correction of mandibular prognathism. Post-osteotomical fixation originally consisted of transosseous wiring and circumferencial wiring, but subsequently Spiessl (1976), Schmocher (1976), and Hadjianghelou (1981) suggested screw fixation. Ceramic screw fixation was introduced in Japan, in 1982. However, all post-osteotomical fixation methods have merits and demerits, and further improvements are required before a final conclusion can be reached.<BR>We designed a new type of pin for the fixation of bone segments after sagittal splitting osteotomy and used it in 11 patients for surgical correction of the mandibular prognathism since 1977, Satisfactory results have been achieved. A follow-up study showed that the relapse rate was minimal due to the improved adaptation and compression offered by the pins, no disturbances of sensibility of the mandibular nerve were noticed apart from trivial hyposthesia in the lower lip of some patients. Tempolo-mandibular joint trouble was almost completely absent. Furthermore the fixation technique is simple and pins removal is easily accomplished.<BR>The special features of the newly designed pin and an outline of two representative cases have been intoroduced.

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