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A STUDY ON BONE-CONTACT TO INTER-SEGMENTAL LENGTH RATIO OF RIGID FIXATION SCREWS USED IN BSSRO FOR MANDIBULAR SETBACK  

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)
Publication Information
Journal of the Korean Association of Oral and Maxillofacial Surgeons / v.35, no.5, 2009 , pp. 329-334 More about this Journal
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
Screw length and ratios; Rigid fixation; Bilateral sagittal split ramus osteotomy;
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