Maxillofacial Plastic and Reconstructive Surgery

Korean Association of Maxillofacial Plastic and Reconstructive Surgeons (대한악안면성형재건외과학회)
권호 표지

COMPARISON OF POSITIONAL STABILITY BETWEEN RIGID FIXATION AND NONRIGID FIXATION IN ORTHOGNATHIC SURGERY

악교정 수술시 견고 및 비견고 고정에 따른 위치적 안정성에 대하 비교 연구

  • Chu, Seong-Chai (Dept. of Oral & Maxillofacial Surgery, College of Dentistry, Seoul National University) ;
  • Min, Byung-Il (Dept. of Oral & Maxillofacial Surgery, College of Dentistry, Seoul National University)
  • 주성채 (서울대학교 치과대학 구강악안면외과학교실) ;
  • 민병일 (서울대학교 치과대학 구강악안면외과학교실)
  • Published : 1991.12.31
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Abstract

Seventeen rigid screw fixation and sixteen nonrigid wire fixation cases of mandibular sagittal slit ramus osteotomy were selected to compare postoperative dental and skeletal changes. A constructed horizontal plane was drawn seven degrees under sella-nasion plane and detailed cephalometirc assessment was applied to serial radiographic films taken before surgery($T_0$), immediately after surgery($T_1$), and at least six months after surgery($T_2$). Linear and angular positional changes were measured and analyzed statistically using paired t-test method and percent of positional changes(amount of post-op change/amount of intra-op change)${\times}100$. The results were as follows; 1. It was 29.4% in rigid fixation cases and 37.5% in nonrigid fixation cases comparing the postoperative positional change of more than 2mm at point B. So rigid fixation method was slightly more stable. 2. In nonrigid fixation cases, the positional change might be caused by incomplete bony union at the osteotomy site and soft tissue tension acting on this site. 3. In rigid fixation cases, the positional change might be caused by interaction between relapse tendency of protracted condyle-proximal segment and neighboring soft tissue tension.

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