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Journal of the Korean Association of Oral and Maxillofacial Surgeons

  • P-ISSN2234-7550
  • E-ISSN2234-5930
  • SCOPUS, KCI, ESCI

THE EVALUATION OF THE POSITIONAL CHANGE OF THE MANDIBULAR CONDYLE AFTER BILATERAL SAGITTAL SPLIT RAMUS OSTEOTOMY USING THREE DIMENSIONAL COMPUTED TOMOGRAPHY IN SKELETAL CLASS Ⅲ PATIENTS

Journal of the Korean Association of Oral and Maxillofacial Surgeons / Journal of the Korean Association of Oral and Maxillofacial Surgeons, (P)2234-7550; (E)2234-5930
2009, v.35 no.5, pp.316-323









Abstract

Purpose: This study was performed to evaluate three-dimensional positional change of the condyle using 3D CT after bilateral sagittal split ramus osteotomy (BSSRO) in skeletal class Ⅲ patients. Patients and methods: Nine patients who underwent BSSRO for mandibular set-back in skeletal class Ⅲ malocclusion without facial asymmetry were examined. Miniplates were used for the fixation after BSSRO. 3-D CT was taken before, immediately after, and 6 months after undergoing BSSRO. After creating 3D-CT images using V-works 4.0TM program, axial plane, coronal plane, & sagittal plane were configured. Three dimensional positional change, from each plane to the condyle, of the nine patients was measured before, immediately after, and 6 months after undergoing BSSRO. Results: 1. The mean value of mandibular set-back for nine mandibular prognathism patients was 7.36 mm (± 2.42 mm). 2. In the axial view, condyle is rotated inward immediately after BSSRO (p < 0.05), comparing with preoperative but outward 6 months after BSSRO comparing with postoperative (p < 0.05). 3. In the axial view, condyle is moved laterally immediately after BSSRO (p < 0.05), comparing with preoperative but regressed 6 months after BSSRO comparing with preoperative (p > 0.05). 4. In the frontal & coronal view, there is changed immediately after and 6 months after BSSRO, comparing with preoperative but no statistical difference. Conclusion: These results indicate that three-dimensional positional change of the condyle in skeletal class Ⅲ patients is observed lateral displacement & inward rotation immediate after BSSRO, but the condyle in 6 months after BSSRO tends to regress to preoperative position.

keywords
BSSRO, Condyle, Skeletal class Ⅲ, Computed tomography

Journal of the Korean Association of Oral and Maxillofacial Surgeons