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KMID : 0355620110370040264
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Journal of Korean Association of Oral and Maxillofacial Surgeons
2011 Volume.37 No. 4 p.264 ~ p.271
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A comparative study on the change of postoperative facial hard tissue profile after maxillary rotational surgery
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Kim Uk-Kyu
Lee Sung-Tak
Kim Tae-Hoon
Song Jae-Min
Hwang Dae-Seok
Jung In-Kyo
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Abstract
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Purpose: This study evaluated retrospectively the postsurgical facial hard tissue profile of a Le Fort I osteotomy with/without posterior impaction and rigid internal fixation to correct mandibular prognathism. After observing a difference between the two groups, this measurement was used to pre￢pare a treatment plan for 2-jaw surgery.
Patients and Methods : Thirty patients who had undergone orthognathic surgery in Pusan National University Dental Hospital were enrolled in this study. Fifteen patients were treated using a Le Fort I osteotomy with posterior impaction and mandibular setback bilateral sagittal split ramus osteoto-my, and the other fifteen patients were treated without posterior impaction. The preoperative (T0), immediate postoperative (T1) and six-month follow-up period (T2) cephalograms were taken and difference between T1-T0 and T2-T2 was analyzed.
Results: Both groups was FH-ABp, SNB and ANB showed significant changes in the measurement, whereas only the posterior impaction group showed a change in the SN-U1, occlusal plane, posterior facial height, surgical movement difference from the L1 and B-point. There was no significant statistical change between the immediate postoperative (T1) and six-month follow-up (T2) hard tissue analysis in the two groups.
Conclusion:A Le Fort I osteotomy with posterior impaction is considerable for patients with a flat occlusal plane angle, large posterior facial height, prominent B-point, pogonion and labioversed incisal inclination if the indications are well chosen.
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KEYWORD
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Hard tissue, Rotational orthognathic surgery, Posterior impaction
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