A retrospective analysis of the stability and relapse of soft and hard tissue change after bilateral sagittal split osteotomy for mandibular setback of 64 Taiwanese patients
| Autor: | Lin-Yang Gi, Hwai-Jen Fong, Fang-Yi Hwang, Yu-Chieng Lai, Richard Che-Shoa Chang, Shou Yen Kao, Joe I-Chiang Chou, Shou-Hsin Kuang |
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| Rok vydání: | 2005 |
| Předmět: |
Adult
Male Chin Cephalometry medicine.medical_treatment Population Taiwan Dentistry Mandible Nose Osteotomy Recurrence Maxilla medicine Humans Prognathism education Retrospective Studies Orthodontics education.field_of_study business.industry Soft tissue Craniometry medicine.disease Lip Sagittal plane Malocclusion Angle Class III medicine.anatomical_structure Otorhinolaryngology Face Female Surgery Oral Surgery Malocclusion business Follow-Up Studies |
| Zdroj: | Journal of Oral and Maxillofacial Surgery. 63:355-361 |
| ISSN: | 0278-2391 |
| DOI: | 10.1016/j.joms.2004.05.228 |
| Popis: | Purpose This study was an analysis of the soft and hard tissue changes of the facial profile after bilateral sagittal splitting osteotomy for mandibular setback of Taiwanese patients. Patients and methods We collected pre- and postsurgical lateral cephalographs of 64 patients (28 males, 36 females) with skeletal Class III malocclusion who received combined orthodontic-surgical treatment with bilateral sagittal splitting osteotomy mandibular setback at Taipei Veterans General Hospital between 1994 and 2000. Nineteen cephalometric parameters of (14 linear, 4 angular, and the BS index) soft and hard tissues were measured at 1 week before treatment, and 2 months and 1 year after surgery, and analyzed by paired t test. Results Mean patient age was 20.0 ± 1.6 years. The patients underwent an average of 7 mm mandibular setback at the osseous pogonion (Pog). Average setbacks at Pog and soft tissue pogonion (pog) were 5.54 mm and 4.85 mm, respectively, at 1 year after surgery. The setback ratio of Pog/pog was 1:0.88. The hard tissue relapse at Pog was 21% at 1 year after surgery. Improvement in prognathic profile was demonstrated by significant changes in the positions of Pog and pog, ANB angle, the distance from lower lip to esthetic line (E-L lip), and the BS index after surgery. However, compared with parameters obtained from a normal Taiwanese population, the cephalometric data of Pog, pog, and BS index still indicated mild prognathism. Conclusion Although mandibular prognathism could be grossly improved by bilateral sagittal splitting osteotomy mandibular setback, a significant amount of relapse occurred within 1 year after surgery. The extent of the postoperatively preserved features showing mandibular prognathism should be a concern for both patients and physicians. |
| Databáze: | OpenAIRE |
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