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KMID : 0360120120340060404
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Journal of the Korean Society of Maxillofacial Plastic Reconstructive Surgeons
2012 Volume.34 No. 6 p.404 ~ p.412
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Skeletal Stability after Orthognathic Surgery in Severe Skeletal Class III Malocclusion Patients according to Changes in Anteroposterior Discrepancy and Occlusal Planes
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Lee Jung-Han
Kim Sung-Hee
Baek Young-Jae
Ahn Kyung-Yong
Hwang Dae-Seok
Kim Yong-Deok
Kim Uk-Kyu
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Abstract
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Purpose: The purpose of this study was to evaluate postsurgical facial hard tissue stability after orthognathic surgery with/without posterior impaction in skeletal class III malocclusion patients, and to evaluate the horizontal relapse tendency, according to changes in anteroposterior discrepancy and occlusal planes.
Methods: Ninety patients, who had undergone orthognathic surgery in Pusan National University Dental Hospital, were enrolled in this study. Three main groups were classified as follows: Thirty patients underwent mandibular setback bilateral sagittal split ramus osteotomy (BSSRO) only (BSSRO group, BG); another thirty patients underwent mandibular setback BSSRO and Le Fort I osteotomy with posterior impaction (posterior impaction group, PG); and another thirty patients underwent mandibular setback BSSRO and Le Fort I osteotomy without posterior impaction (non-posterior impaction group, NPG). Preoperative (T0), immediate postoperative (T1) and six-month follow-up period (T2) lateral cephalograms were taken, and various parameters were measured. The analyses were done by linear and angular measurements between T0-T1 and T1-T2, to evaluate postsurgical facial hard tissue stability.
Results: Mean horizontal relapse rates were distributed from 11.81% to 19.08%, and there were significant postsurgical changes (0.52 mm~2.44 mm) at the B point in all 3 groups. But, there were no statistical differences on relapse rate among BG, PG and NPG patients.
Conclusion: In this study, the postsurgical stabilities of BSSRO and Le Fort I osteotomy with/without posterior impaction in skeletal class III malocclusion patients were acceptable. There were no significant statistical differences in mandibular stability according to changes in anteroposterior discrepancy and occlusal planes.
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KEYWORD
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Mandibular prognathism, Stability, Relapse, Maxillary impaction
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