title: Osteosynthesis using biodegradable Poly-p-dioxanon (PDS II) in Le Fort I-osteotomy without postoperative intermaxillary fixation.
abstract: The purpose of the study was to evaluate the stability of Le Fort I advancement using biodegradable Poly-p-dioxanon (PDS II)-thread in the fixation of the osteotomy and to compare the results with that of metallic devices. Positional changes were registered by cephalometric examination with standardized radiography. 30 class III adult patients were chosen, whose treatment by surgical movement of the Le Fort I segment was similar in dimension and direction. They were subjected to a clinical and cephalometric analysis of postoperative stability. 4 lateral cephalometric X-rays were evaluated for each patient and compared in their two deviation levels. In order to assess the vertical and sagittal behaviour of the osteotomized segments, independent of intraoperatively altered structures, a system of coordinates was drawn up. Statistical examination of the existing data was carried out by computer. For calculation of significance the Wilcoxon-test, T-test, and Kruskal-Wallis-test were used. It could be demonstrated that PDS-thread as well as titanium-miniplates showed good stability in the anterioposterior plane, but a tendency to vertical relapse in both groups.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Krankenhaus der Stadt Linz, Austria.
authors.forename: J A
authors.initials: JA
authors.lastname: Obwegeser
mesh_terms: D000293:Adolescent; D000328:Adult; D001860:Bone Plates; D001863:Bone Screws; D002508:Cephalometry; D004146:Dioxanes / Q000737:chemistry; D005260:Female; D006801:Humans; D007103:Immobilization; D008297:Male; D008437:Maxilla / Q000002:abnormalities / Q000473:pathology / Q000601:surgery*; D010027:Osteotomy / Q000295:instrumentation* / Q000379:methods*; D011108:Polymers / Q000737:chemistry; D012399:Rotation; D013537:Sutures; D014025:Titanium; D014716:Vertical Dimension
chemical_list: D004146:Dioxanes; D011108:Polymers; C079733:poly-4-dioxan-2-one; D014025:Titanium