title: Immediate mechanical stability of sagittal split ramus osteotomy fixed with resorbable compared with titanium bicortical screws in mandibles of sheep.
abstract: Ten fresh mandibles from adult sheep were stripped of all soft tissues and sectioned in the midline. We did sagittal split osteotomies and 5 mm advancement on all the 20 hemimandibles. Ten hemimandibles were fixed with three 2.0 mm x 13 mm titanium bicortical screws, and the other 10 were fixed with three 2.0 mm x 13 mm poly-l-lactic acid/polyglycolic acid (PLLA/PGA) bicortical screws in an inverted L pattern. All the hemimandibles were then mounted in a servohydraulic testing unit and tested to permanent deformation. Maximum forces that the mandibles resisted before breaking, maximum displacements, and the displacement values under 20, 60, 120, and 150 N were compared using the Mann-Whitney U-test. There were no significant differences in stability between the bones fixed with titanium and those fixed with resorbable screws.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Baskent University, Ankara, Turkey. ulkemc@gmail.com
authors.forename: Ulkem
authors.initials: U
authors.lastname: Cilasun
authors.forename: Sina
authors.initials: S
authors.lastname: Uckan
authors.forename: Dogan
authors.initials: D
authors.lastname: Dolanmaz
authors.forename: Haci
authors.initials: H
authors.lastname: Saglam
mesh_terms: D020341:Absorbable Implants; D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry; D001863:Bone Screws; D004548:Elasticity; D019344:Lactic Acid / Q000737:chemistry; D008334:Mandible / Q000601:surgery*; D019186:Mandibular Advancement / Q000295:instrumentation / Q000379:methods; D010027:Osteotomy / Q000295:instrumentation / Q000379:methods*; D018583:Pliability; D011100:Polyglycolic Acid / Q000737:chemistry; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry; D012756:Sheep; D013314:Stress, Mechanical; D014025:Titanium / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D014025:Titanium