하악지 시상절단술시 견고 고정 나사의 골편간/골내 길이 및 비율에 대한 연구
EVALUATION OF THE AVAILABILITY OF SURGICAL TREATMENT OBJECTIVE(STO) USING SUBMENTOVERTEX(SMV) VIEW
조성민, 김성훈, 박재억,
소속 상세정보
조성민 ( Cho Sung-Min ) - 가톨릭대학교 의과대학 치과학교실 구강악안면외과
김성훈 ( Kim Seong-Hun ) - 가톨릭대학교 의과대학 치과학교실 교정과
박재억 ( Park Je-Uk ) - 가톨릭대학교 의과대학 치과학교실 구강악안면외과
KMID : 0355620090350050329
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.
키워드
Screw length and ratios;Rigid fixation;Bilateral sagittal split ramus osteotomy
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