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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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±è¿µÁØ ( Kim Young-Joon ) - Àü³²´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡ÁÖ°úÇб³½Ç
±¹¹Î¼® ( Kook Min-Suk ) - Àü³²´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø ±¸°¾Ç¾È¸é¿Ü°úÇб³½Ç
¹ÚÈ«ÁÖ ( Park Hong-Ju ) - Àü³²´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø ±¸°¾Ç¾È¸é¿Ü°úÇб³½Ç
¿ÀÈñ±Õ ( Oh Hee-Kyun ) - Àü³²´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø BK21»ç¾÷´Ü
KMID : 0360120080300030232
Abstract
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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Transverse change;Mandibular prognathism;3D-CT;Frontal-ramal inclination;Intergonial width;Intercondylar width
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