Abstract
Fractures of the mandibular angle have been well-described and, in most societies,
their incidence is decreasing. In this study we analysed the stabilisation of fractures
using a single plate (standard or optimised model). The finite element model was developed
based on a mandibular computed tomographic scan, together with a miniplate from DePuy
Synthes and an optimised plate. Using the finite element model we looked in turn at
the four screws for fixation of the standard plate, and the six screws for the optimised
plate, in a complete and an incomplete favourable fracture of the mandibular angle,
using two screw diameters, 1.5 and 2 mm.
The results indicated that a complete fracture is critical, with 10% more strain at
the bone holes. The maximum microstrain was found for the 1.5mm diameter, in screws
number 2 and 4, with 7270με and 6872με in the complete fractures, respectively. There
were similar microstrains in screws number 1 and 2 of the optimised plate with six
screws showing similar strains. Micromovements in the fracture line achieved 60με.
The position of the screws influences the microstrains along the fracture line, suggesting
that the surgeon places the screws along that line at a distance of 2.5 times the
diameter of the screw. The optimised geometry with more screws does not prevent screws
from loosening.
Keywords
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Article info
Publication history
Published online: March 26, 2020
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© 2020 The British Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.
