Fractographic analysis of 2.0-mm plates with a screw locking system in simulated fractures of the mandibular body
| Autor: | Marcelo Breno Menezes Mendes, Andrezza Lauria de Moura, Renato Sawazaki, Danillo Costa Rodrigues, Raquel Correia de Medeiros, Roger William Fernandes Moreira |
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| Rok vydání: | 2013 |
| Předmět: |
Models
Anatomic Surface Properties medicine.medical_treatment Bone Screws Biocompatible Materials computer.software_genre Load testing Fixation (surgical) Fracture Fixation Internal Mandibular Fractures Stereo microscope Fracture fixation Bone plate medicine Alloys Humans Composite material Aluminum Compounds Mechanical Phenomena Titanium business.industry Equipment Design Traction (orthopedics) Compression (physics) Equipment Failure Analysis Otorhinolaryngology Fracture (geology) Microscopy Electron Scanning Surgery Stress Mechanical Oral Surgery business computer Bone Plates |
| Zdroj: | Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons. 72(6) |
| ISSN: | 1531-5053 |
| Popis: | Purpose The purpose of the present study was to analyze the fractured plates from 2 brands of 2.0-mm locking fixation systems submitted to axial linear load testing. Materials and Methods Four aluminum hemimandibles with linear sectioning to simulate a mandibular body fracture were used as a substrate and fixed with 2 fixation techniques from 2 national brands: Toride and Traumec. The techniques were as follows: one 4-hole plate, with four 6-mm screws in the tension zone, and one 4-hole plate, with four 10-mm screws in the compression zone; and one 4-hole plate, with four 6-mm holes in the neutral zone. The hemimandibles were submitted to vertical linear load tests using an Instron 4411 mechanical test machine. The system was submitted to the test until complete failure had occurred. Next, a topographic analysis of the surface of the plates was performed using a stereomicroscope and an electronic scanning microscope. The samples were evaluated using different magnifications, and images were obtained. Results The surface of the fracture analyzed in scanning electron microscopy demonstrated a ductile-type fracture, usually found in the traction test bodies of ductile materials, such as titanium. No evidence of failure was observed in any fracture surface from a change in the structure or composition of the material. Conclusions The plates were fractured by a ductile rupture mechanism, as expected, suggesting that the manufacturing of the national brand name plates used in the present study has been under adequate quality control, with no structural changes produced by the manufacturing process that could compromise their function. |
| Databáze: | OpenAIRE |
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