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KMID : 0360120080300030232
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Journal of the Korean Society of Maxillofacial Plastic Reconstructive Surgeons
2008 Volume.30 No. 3 p.232 ~ p.240
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TRANSVERSE CHANGE OF THE PROXIMAL SEGMENT AFTER BILATERAL SAGITTAL SPLIT RAMUS OSTEOTOMY IN MANDIBULAR PROGNATHISM USING COMPUTED TOMOGRAPHY
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Kim Young-Joon
Kook Min-Suk
Park Hong-Ju
Oh Hee-Kyun
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Abstract
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Purpose: This study was performed to evaluate transverse changes of proximal segment after bilateral sagittal split ramus osteotomy (BSSRO) using 3-D CT in mandibular prognathism.
Patients and methods: Twenty-two patients who underwent BSSRO for mandibular set-back in class III malocclusion without facial asymmetry were examined. Miniplates were used for the fixation after BSSRO. Facial CT was taken before and after BSSRO within 3 months. Frontal-ramal inclination (FRI), inter-gonial width (IGW) and intercondylar width (ICW) were measured in 3-D CT images using V-works program. Student t-test was used to compare the changes between pre- and post-operative measurements using SPSS 10.0 program.
Results: 1. Mean peroperative FRI value () was slightly increased to postoperative value () (p < 0.05). The average FRI increased 10.42% and the range was from to . 2. Mean peroperative IGW () was slightly decreased to postoperative IGW () (p < 0.05). The average IGW decreased 2.52 % and the range was from to 0.91 mm. 3. Mean preoperative ICW () was slightly decreased to postoperative ICW () (p < 0.05). There is no significant difference between pre- and post-operative ICW. 4. There was significant correlationship between FRI difference and IGW difference (p < 0.05).
Conclusions: These results indicate that the lower ramus of the proximal segment is moved inward after BSSRO procedure for mandibular set-back.
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KEYWORD
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Transverse change, Mandibular prognathism, 3D-CT, Frontal-ramal inclination, Intergonial width, Intercondylar width
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