Journal of the Korean Association of Oral and Maxillofacial Surgeons

The Korean Association of Oral and Maxillofacial Surgeons (대한구강악안면외과학회)
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A STUDY ON BONE-CONTACT TO INTER-SEGMENTAL LENGTH RATIO OF RIGID FIXATION SCREWS USED IN BSSRO FOR MANDIBULAR SETBACK

하악지 시상절단술시 견고 고정 나사의 골편간/골내 길이 및 비율에 대한 연구

  • Cho, Sung-Min (Div. of Oral & maxillofacial Surgery, Dept. of Dentistry, College of medicine, The Catholic University) ;
  • Kim, Seong-Hun (Div. of Orthodontics, Dept. of Dentistry, College of medicine, Catholic University) ;
  • Park, Je-Uk (Div. of Oral & maxillofacial Surgery, Dept. of Dentistry, College of medicine, The Catholic University)
  • 조성민 (가톨릭대학교 의과대학 치과학 교실 구강악안면외과) ;
  • 김성훈 (가톨릭대학교 의과대학 치과학 교실 교정과) ;
  • 박재억 (가톨릭대학교 의과대학 치과학 교실 구강악안면외과)
  • Published : 2009.10.30
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Abstract

Objective: To evaluate the ratio between bone-contact length and inter-segmental length of the rigid fixation screw used in bilateral sagittal split ramus osteotomy (BSSRO) for mandibular setback. Material and Methods: Records of 40 patients with Class III malocclusion were selected. 20 of them had BSSRO, while the other 20 had BSSRO with maxillary LeFort I osteotomy. All of the patients had three noncompressive bicortical screws inserted at the gonial angle through transcutaneous approach. Two screws were inserted antero-posteriorly above inferior alveolar nerve and one screw was inserted below. The lengths of bone-contact and that of inter-segmental part were measured using cone-beam computed tomography. Ratio between these two measured lengths was calculated. Results: Both bone-contact and inter-segmental lengths were longer in BSSRO group than in BSSRO with maxillary LeFort I osteotomy group. Ratio of bone-contact to inter-segmental length was lower in BSSRO group than in BSSRO with Lefort I group. Both bone-contact and inter-segmental lengths were longer at the antero-superior position than at the inferior position. However, their ratio showed little difference. Conclusion: This study suggest that stability of screws in BSSRO group was greater than in BSSRO with Lefort I group. Stability of screws at the antero-superior position was greater than at the inferior position. Ratio of bone-contact to inter-segmental lengths was 0.2 in average.

Keywords

References

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