Evaluation of in vitro resistance of titanium and resorbable (poly- l - dl -lactic acid) fixation systems on the mandibular angle fracture

• Published in: International journal of oral and maxillofacial surgery Vol. 40; no. 3; pp. 316 - 321
• Main Authors: Bregagnolo, L.A, Bertelli, P.F, Ribeiro, M.C, Sverzut, C.E, Trivellato, A.E
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-03-2011; Elsevier
• Subjects: Absorbable Implants; Biocompatible Materials - chemistry; Biological and medical sciences; Biomechanical Phenomena; Bone Plates; Bone Screws; Dental Arch - pathology; Dentistry; Equipment Failure; Fracture Fixation - instrumentation; Humans; Incisor - pathology; Injuries of the limb. Injuries of the spine; Internal Fixators; Lactic Acid - chemistry; Mandible - pathology; mandibular angle fracture; Mandibular Fractures - surgery; Materials Testing; Medical sciences; Models, Anatomic; Molar - pathology; Otorhinolaryngology. Stomatology; plate; Polyesters; Polymers - chemistry; Polyurethanes - chemistry; resistance; resorbable; screw; Stress, Mechanical; Surgery; titanium; Titanium - chemistry; Traumas. Diseases due to physical agents; plate; resorbable; mandibular angle fracture; titanium; resistance; screw; Mandible; Stomatology; Diseases of the osteoarticular system; Fracture; Trauma; In vitro; Plate; Resistance; Fixation; Treatment; Screw; Surgery; Titanium; Lactic acid
• ISSN: 0901-5027; 1399-0020
• DOI: 10.1016/j.ijom.2010.10.004

Abstract The purpose of this study was to compare, by mechanical in vitro testing, a 2.0-mm system made with poly- l - dl -lactide acid with an analogue titanium-based system. Mandible replicas were used as a substrate and uniformly sectioned on the left mandibular angle. The 4-hole plates were adapted and stabilized passively in the same site in both groups using four screws, 6.0 mm long. During the resistance-to-load test, the force was applied perpendicular to the occlusal plane at three different points: first molar at the plated side; first molar at the contralateral side; and between the central incisors. At 1 mm of displacement, no statistically significant difference was found. At 2 mm displacement, a statistically significant difference was observed when an unfavourable fracture was simulated and the load was applied in the contralateral first molar and when a favourable fracture was simulated and the load was applied between the central incisors. At the failure displacement, a statistically significant difference was observed only when the favourable fracture was simulated and the load was applied on the first molar at the plated side. In conclusion, despite more failure, the poly- l - dl -lactic acid-based system was effective.