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Perpendicular Pull‐Out Force of Locking Versus Non‐Locking Plates in Thin Cortical Bone Using a Canine Mandibular Ramus Model
Author(s) -
Miller Emily I.,
Acquaviva Anthony E.,
Eisenmann David J.,
Stone Richard T.,
Kraus Karl H.
Publication year - 2011
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/j.1532-950x.2011.00893.x
Subject(s) - perpendicular , cadaveric spasm , dynamic compression plate , stiffness , medicine , cortical bone , orthodontics , mandible (arthropod mouthpart) , long axis , cadaver , displacement (psychology) , biomedical engineering , dentistry , materials science , anatomy , composite material , geometry , mathematics , internal fixation , psychology , botany , biology , psychotherapist , genus
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.