Biomechanical study on reconstruction of segmental mandibular defectswith prosthesis with support and porous structure
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1.College of Stomatology,Xi’an Medical University,Xi’an;2.College of Stomatology,the Air Force Military Medical University,Xi’an;3.General Hospital of PLA

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    Abstract:

    Objective: Design a personalized titanium mandibular prosthesis with porous and support structure, and analyze its stress distribution characteristics through finite element analysis to evaluate the clinical value and prospect of the prosthesis. Methods: The fourth mandibular premolar and molar of the right mandible of Beagle dogs were removed, three months after healing, spiral CT was taken and a three-dimensional model of the mandible was established. The prosthesis consists of abutment, pillar, solid unit, porous unit and retention unit. Establish a personalized titanium mandibular prosthesis finite element model A, analyze the stress of the prosthesis at load, and proceed to the next study when the maximum stress of each part constituting the prosthesis is less than the yield strength of its material; Construct a finite element model B of the assembly of the prosthesis, mandible and screw, load the average mastication force, record stress, strain and displacement distribution of the mandible. Results: When the abutment is vertically loaded with a load of 100N, the peak stress of the prosthetic solid structure is 147.03MPa; the peak stress of the porous structure is 75.36MPa, which is less than the yield strength of its material; the cortical bone the peak stress and strain were 53.713 MPa and 3753.6μ, the peak stress and strain of cancellous bone were 4.2167 MPa and 3562.5μ, respectively, and the maximum displacement of the restoration was 0.3383 mm. Conclusion: Taking the canine mandible as an example, the individualized prosthesis with porous and support structure showed a uniform stress distribution and good mechanical properties through finite element analysis, which provided a new method for the design of prosthesis to repair mandibular defects.

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History
  • Received:June 19,2020
  • Revised:September 05,2020
  • Adopted:September 10,2020
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