Analysis of stress induced by screws in the vertebral fixation system
Objective: To compare, using photoelasticity, internal stress produced by USS II type screw with 5.2 and 6.2 mm external diameters, when submitted to three different pullout strengths. Methods: Two photoelastic models were especially made. The simulation was performed using loads of 1.8, 2.4 e 3.3 kgf.The fringe orders were evaluated around the screws. In all the models analyzed the shear stress were calculated. Results: Independently of the applied load, the smaller screw showed higher values of shear stress. Conclusion: According to the analysis performed, we observed that the place of highest stress was in the first thread of the lead, close to the head of the screws. Experimental study.
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| Main Authors: | , , , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
ATHA EDITORA
2014
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| Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1413-78522014000100017 |
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