Le Fort I型骨切り術におけるミニプレートの固定性について

概要

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Le Fort I osteotomy modified by Obwegeser has become a basic technique in the treatment of jaw deformities and is used by many maxillofacial surgeons. Fixation following Le Fort I osteotomy has changed from metallic wire fixation to fixation using miniplate. Although the usefulness of miniplate is clinically recognized, dynamic evaluation of postoperative stability has been rare. The authors assessed, using SAPHON VISITRAINER II C (Sato-Iryodenshi) and Autograph S-500 (Shimazu), miniplate fixation power following Le Fort I osteotomy in various combinations of Champys miniplate.<BR>(1) Fixation with 6-miniplate resulted in significantly smaller displacement in three directions, compared to other fixations.<BR>(2) On comparing displacement by 4-miniplate and 6-miniplate fixations, no significant differences were demonstrated in the sagittal and dextrosinistrol directions.<BR>(3) Fixation with 2-miniplate produced a significantly larger displacement than that with 4 or 6 miniplates.<BR>(4) Stability comparison of 2-miniplate fixation at the region of submalar crest with that at the margin of piriform aperture showed no significant displacement differences in the three directions.