Fracture of titanium plates used for mandibular reconstruction following ablative tumor surgery
- 18 July 2006
- journal article
- Published by Wiley in Journal of Biomedical Materials Research Part B: Applied Biomaterials
- Vol. 80B (2), 345-352
- https://doi.org/10.1002/jbm.b.30603
Abstract
Purpose The purpose of this study was to identify reasons for fracture of titanium mandibular reconstruction plates, when used to bridge lateral mandibular defects after ablative tumor surgery. Materials and Methods Sixteen titanium reconstruction plates from sheep mandibles were examined to identify reasons for the plate fractures. The broken plates and the seemingly unbroken plates were examined separately. The plates were removed from the mandibular bone and inspected by dye penetrant examination, metallography, optical microscope, scanning electron microscope, and energy dispersive X‐ray spectrometer. Furthermore, axial load fatigue tests were performed in two different environments, air and physiologic salt solution, 0.9% NaCl, to compare titanium behavior in air and the human body. Results The site of crack initiation was the inner curvature of the reconstruction plate, and the cracks initiated as a result of stress concentration in the shoulder fillet of the plate. The cracks grew in a cyclic manner under masticatory loading of the mandible and the plate. The plate fracture occurred by means of fatigue. The corrosive environment did not affect the failure of the titanium plate, and the fracture was not caused by hydrogen embrittlement. The results revealed that the fatigue properties of the plates may have been impaired by the residual stresses generated in plate bending. Conclusions Adjustive bending of the plates, in the surgical operation, may thus be an important cause of fracture of the reconstruction plates, because of generated residual stresses, which affect the mean stress in fatigue loading. To make the plates function without failure the plates should match closely with the three‐dimensional shape of the mandible, to avoid any bending in the operative phase. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2007Keywords
This publication has 12 references indexed in Scilit:
- Mandibular reconstruction using the titanium functionally dynamic bridging plate system: a retrospective study of 34 casesJournal of Oral and Maxillofacial Surgery, 2004
- Material analysis of AO plate fracture casesJournal of Oral and Maxillofacial Surgery, 2004
- Comparative study of locking plates in mandibular reconstruction after ablative tumor surgery: THORP versus UniLOCK systemJournal of Oral and Maxillofacial Surgery, 2004
- Hydrogen-Assisted Degradation of Titanium Based AlloysMATERIALS TRANSACTIONS, 2004
- Microscopic Feature of Fractured Implant in Practical Dental UseMATERIALS TRANSACTIONS, 2004
- Bite forces in patients after treatment of mandibular angle fractures with miniplate osteosynthesis according to ChampyInternational Journal of Oral & Maxillofacial Surgery, 2002
- Fracture of mandibular reconstruction plates used after tumor resectionJournal of Oral and Maxillofacial Surgery, 2002
- A comparative study on four screw-plate locking systems in sheep: a clinical and radiological studyInternational Journal of Oral & Maxillofacial Surgery, 2001
- Reconstruction plates to bridge mandibular defects: a clinical and experimental investigation in biomechanical aspectsInternational Journal of Oral & Maxillofacial Surgery, 1999
- Reconstruction plates to bridge mandibular defects: a clinical and experimental investigation in bimomechanical aspectsInternational Journal of Oral & Maxillofacial Surgery, 1999