하악지 시상절단술시 견고 고정 나사의 골편간/골내 길이 및 비율에 대한 연구 (A STUDY ON BONE-CONTACT TO INTER-SEGMENTAL LENGTH RATIO OF RIGID FIXATION SCREWS USED IN BSSRO FOR MANDIBULAR SETBACK)

서지정보

· 발행기관 : 대한구강악안면외과학회
· 수록지 정보 : 대한구강악안면외과학회지 / 35권 / 5호 / 329 ~ 334페이지
· 저자명 : 조성민, 박재억, 김성훈

초록

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.

영어초록

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.

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