A Study on Bone-Contact to Inter-Segmental Length Ratio of Rigid Fixation Screws used in Bssro for Mandibular Setback
Journal of the Korean Association of Oral and Maxillofacial Surgeons
;
: 329-334, 2009.
Artículo
en Coreano
| WPRIM
| ID: wpr-204300
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 ANDMETHODS:
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.
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Osteotomía
/
Tomografía Computarizada de Haz Cónico
/
Osteotomía Sagital de Rama Mandibular
/
Maloclusión
/
Nervio Mandibular
Límite:
Humanos
Idioma:
Coreano
Revista:
Journal of the Korean Association of Oral and Maxillofacial Surgeons
Año:
2009
Tipo del documento:
Artículo
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