BIOMECHANICAL ANALYSIS OF METHODS FOR RESTORING THE INTEGRITY OF THE MAXILLA VERTICAL BUTTRESSES IN MIDFACIAL BONES FRACTURES USING INDIVIDUALISED FINITE ELEMENT MODELS
DOI:
https://doi.org/10.35220/2078-8916-2020-38-4-72-77Keywords:
finite element analysis, midfacial zone, Le Fort, osteosynthesisAbstract
Modeling using finite element method allows to better un-derstand the parameters of the fixator - bone system, to optimize treatment tactics and predict the results in the restoration of the midfacial vertical buttresses after their traumatic injuries.
Purpose. To compare the stress-strain state of the fixator-bone systems in individual finite element models after us-ing different methods for restoring the buttresses under masticatory loading.
Materials and methods. To determine the indicators of deformation and stress in 9 finite element models of midfacial bones with restored buttresses in 3 different ways. Gr 1 – linear fractured buttresses with anatomical-ly accurate fixated fragments. Gr 2 – restoring bone de-fect of the buttress only with the miniplate. Gr 3 - using a bone graft in combination with the miniplate for buttress restoring.
Results. The average value of displacement and stress: Gr I – 0.15±0.03 mm and 27.3±13.1 MPa; Gr ІІ – 0.48±0.2 mm and 59.8 ± 34.7 MPa; Gr ІІІ – 0.23±0.09 mm and 41.6±1.7 MPa.
Conclusions. Precise repositioning of bone fragments in the area of яbuttresses provides rigidity of fixation at the level of intact bone. Restoring of defects with bone autografts allows to increase the rigidity of fixation on average by 2 times and to reduce the stress in the fixation elements by an average of 30 %.
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