Perpendicular pull-out force of locking versus non-locking plates in thin cortical bone using a canine mandibular ramus model
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Published on: March 7, 2014
Emily I Miller1, Anthony E Acquaviva, David J Eisenmann
1Department of Veterinary Clinical Sciences, Dr. W. Eugene and Linda Lloyd Veterinary Medical Center, College of Veterinary Medicine, Iowa State University, 1600 South 16th Street, Ames, IA 50011, USA. emiller@iastate.edu
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.
