Perpendicular Pull-Out Force of Locking Versus Non-Locking Plates in Thin Cortical Bone Using a Canine Mandibular Ramus Model

Authors

  • Emily I. Miller DVM,

    Corresponding author
    • Department of Veterinary Clinical Sciences, Dr. W. Eugene and Linda Lloyd Veterinary Medical Center, College of Veterinary Medicine, Iowa State University, Ames, IA
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  • Anthony E. Acquaviva VMD,

    1. Department of Veterinary Clinical Sciences, Dr. W. Eugene and Linda Lloyd Veterinary Medical Center, College of Veterinary Medicine, Iowa State University, Ames, IA
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  • David J. Eisenmann MS,

    1. Iowa State University Center for Nondestructive Evaluation, Ames, IA
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  • Richard T. Stone PhD,

    1. Department of Industrial and Manufacturing Systems Engineering, Iowa State University, Ames, IA
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  • and , Karl H. Kraus DVM, Diplomate ACVS

    1. Department of Veterinary Clinical Sciences, Dr. W. Eugene and Linda Lloyd Veterinary Medical Center, College of Veterinary Medicine, Iowa State University, Ames, IA
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  • Specimen preparation was performed at the Iowa State University College of Veterinary Medicine and mechanical testing was performed at the Iowa State University Center for Nondestructive Evaluation.

Corresponding Author

Emily I. Miller, DVM, Dr. W. Eugene and Linda Lloyd Veterinary Medical Center, Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, 1600 South 16th Street, Ames, IA 50011.

E-mail: emiller@iastate.edu

Abstract

Objective

To compare the holding strength of a conventional plate-screw construct with a locking plate-screw construct in the thin cortical bone of the canine mandibular ramus.

Study design

Mechanical study.

Animals

Paired cadaveric canine mandibles (n = 10 pairs).

Methods

Perpendicular pull-out testing was performed on 2.0-mm limited-contact dynamic compression plate (LC-DCP)-screw constructs and 2.0-mm string-of-pearls (SOP) plate-screw constructs applied to the ramus of the canine mandible. Pull-out force was applied perpendicular to the long axis of the plates. Construct stiffness and load at failure were determined from load-displacement curves and method of failure was determined from high speed digital video recordings. A paired t-test was used to compare mean construct stiffness and load at failure between groups.

Results

SOP plate-screw constructs had a significantly higher mean construct stiffness and load at failure than did LC-DCP-screw constructs. LC-DCP constructs failed by screw pull-out while bone slicing and fracture were prominent mechanisms of failure for SOP constructs.

Conclusions

SOP plate-screw constructs sustained a significantly higher perpendicular load at failure than did LC-DCP-screw constructs.

Ancillary