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Research Papers

Pullout Performance of Self-Tapping Medical Screws

[+] Author and Article Information
Zhijun Wu, Sayed A. Nassar

Xianjie Yang

 Fastening and Joining Research Institute, Department of Mechanical Engineering, Oakland University, Rochester, MI 48309yang2345@oakland.edu

J Biomech Eng 133(11), 111002 (Nov 18, 2011) (9 pages) doi:10.1115/1.4005172 History: Received May 12, 2011; Revised September 23, 2011; Published November 18, 2011; Online November 18, 2011

This study investigates the effect of the pilot hole size, implant depth, synthetic bone density, and screw size on the pullout strength of the self-tapping screw using analytical, finite element, and experimental methodologies. Stress distribution and failure propagation mode around the implant thread zone are also investigated. Based on the finite element analysis (FEA) results, an analytical model for the pullout strength of the self-tapping screw is constructed in terms of the (synthetic) bone mechanical properties, screw size, and the implant depth. The pullout performance of self-tapping screws is discussed. Results from the analytical and finite element models are experimentally validated.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Experiential setup for tensile test of the synthetic bone tests on MTS 810

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Figure 2

Experiential and FEA tensile true stress-true strain curve for different density of synthetic bones

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Figure 3

Experiential compressive true stress-true strain curve for different density of the synthetic bones

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Figure 4

A typical schematic for compressive damaged plasticity model

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Figure 5

Experimental setup of the self-tapping screw pullout test

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Figure 6

Schematic profile of the self-tapping screw

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Figure 7

Geometry and size of one of the finite element model

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Figure 8

The effect of pilot hole diameter on pullout strength for 4.5 and 6.5 mm screws with 20 mm implant depth

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Figure 9

Experimental and FEA pullout force versus pullout displacement for 4.5 mm screw with different implant depths in 0.48 g/cm3 synthetic bone

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Figure 10

The effect of screw implant depth on pullout strength for 4.5 and 6.5 mm screws with different density of the synthetic bone

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Figure 11

Typical pullout failure: (a) 6.5 mm screw, density = 0.24 g/cm3 , depth = 25 mm and (b) 4.5 mm screw, density = 0.24 g/cm3 , depth = 30 mm

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Figure 12

Stiffness degradation distribution from FEA at the maximum pullout force for 4.5 mm screw, 30 mm implant depth in the 0.48 g/cm3 synthetic bone

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Figure 13

The effect of screw size on pullout strength for two densities of the synthetic bone with 20 mm implant depth

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Figure 14

The relationship between synthetic bone density and experimental Young’s modulus

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Figure 15

The effect of synthetic bone density on pullout strength for 4.5 and 6.5 mm screws with 15 and 30 mm implant depth

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