In vitro comparison of parameters affecting the fixation strength of sagittal split osteotomies
| Autor: | Stephen E. Feinberg, E.R. Dootz, Erik M Richmond, William S. Pietrzak, David H. Kohn |
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| Rok vydání: | 1995 |
| Předmět: |
musculoskeletal diseases
medicine.medical_specialty Polymers medicine.medical_treatment Bone Screws Biocompatible Materials Mandible In Vitro Techniques Osteotomy Fracture Fixation Internal Random Allocation Flexural strength Polylactic Acid-Polyglycolic Acid Copolymer Cadaver Fracture fixation medicine Shear stress Humans Lactic Acid Aged Titanium Analysis of Variance business.industry Biomechanics Torsion (mechanics) Equipment Design musculoskeletal system equipment and supplies Sagittal plane Surgery Biomechanical Phenomena surgical procedures operative medicine.anatomical_structure Otorhinolaryngology Oral Surgery business Polyglycolic Acid Biomedical engineering |
| Zdroj: | Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons. 53(12) |
| ISSN: | 0278-2391 |
| Popis: | Purpose: The goal of this study was to determine how different parameters affect the bending strength of human cadaver mandibles that have undergone a sagittal split osteotomy. Materials and Methods: The effects of screw material (titanium [Ti] vs polylactic acid/polyglycolic acid [PLA/PGA]), screw configuration (linear vs inverted L-shape), screw diameter (2.0 mm vs 2.7 mm), material into which screws were inserted (human mandible, bovine rib, synthetic polymer), and loading rate (1.0 mm/min vs 10.0 mm/min) were quantified. Also, biomechanical principles were used to model shear stress and displacement. Variable lever arms, screw material, screw diameter, screw configuration, distance between screws, and bone properties were all evaluated in this model. Results: Accounting for variable mandible geometries and differentiating between deflections (and shear stresses) due to bending and due to torsion, in vitro mechanical testing revealed that there was a statistically significant difference in total shear stress at 3 mm of deflection depending on screw material (Ti > PLA PGA ), screw diameter, and material into which screws are inserted (mandibles > ribs = synthetic polymer). There was no significant difference in total shear stress depending on screw configuration or strain rate. Conclusion: Total shear stress and deflections are important and more viable parameters than load to assess parameters of clinical importance in osteotomy or fracture fixation. |
| Databáze: | OpenAIRE |
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