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Research Papers

Computer Aided Biomodeling and Analysis of Patient Specific Porous Titanium Mandibular Implants

[+] Author and Article Information
Jayanthi Parthasarathy

Center for Shape Engineering and Advanced Manufacturing, School of Industrial Engineering, University of Oklahoma, 202 W. Boyd Street, Room 124, Norman, OK 73019-0631jayanthi@ou.edu

Binil Starly

Center for Shape Engineering and Advanced Manufacturing, School of Industrial Engineering, University of Oklahoma, 202 W. Boyd Street, Room 124, Norman, OK 73019-0631starlyb@ou.edu

Shivakumar Raman

Center for Shape Engineering and Advanced Manufacturing, School of Industrial Engineering, University of Oklahoma, 202 W. Boyd Street, Room 124, Norman, OK 73019-0631raman@ou.edu

J. Med. Devices 3(3), 031007 (Sep 01, 2009) (9 pages) doi:10.1115/1.3192104 History: Received February 24, 2009; Revised April 29, 2009; Published September 01, 2009

Custom implants for the reconstruction of mandibular defects have recently gained importance due to their better performance over their generic counterparts. This is attributed to their precise adaptation to the region of implantation, reduced surgical times, and better cosmesis. Recent introduction of direct digital manufacturing technologies, which enable the fabrication of implants from patient specific data, has opened up a new horizon for the next generation of customized maxillofacial implants. In this article, we discuss a representative volume element based technique in which precisely defined porous implants with customized stiffness values are designed to match the stiffness and weight characteristics of surrounding healthy bone tissue. Dental abutment structures have been incorporated into the mandibular implant. Finite element analysis is used to assess the performance of the implant under masticatory loads. This design strategy lends itself very well to rapid manufacturing technologies based on metal sintering processes.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

(a) Mandible reconstruction with generic reconstruction plate and (b) resected tumor mandible

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Figure 2

Titanium mandible implant fabricated using CNC machining process

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Figure 3

Roadmap for the design of mandible implant from CT images

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Figure 4

(a) Thresholding operation; (b) reconstructed mandible with defect; (c) virtual surgical simulation and reconstruction of external geometry of the implant

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Figure 5

(a) Canine to canine reconstruction—Model 1; (b) premolar to subcondylar reconstruction—Model 2; (c) hemimandible reconstruction—Model 3

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Figure 6

Bounding porous cube intersected with the implant

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Figure 7

Resultant porous implant after the boolean operation with interconnected pores

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Figure 8

Porous mandibular implant fitted to the normal right mandible

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Figure 9

(a) RVE with applied boundary conditions and (b) FEA contour plot for stress distribution within the RVE

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Figure 10

(a), (b), and (c) Loads and constraints on mandibular models 1, 2, and 3

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Figure 11

Effective elastic modulus predicted by FEA method

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Figure 12

Comparison of properties of solid and porous titanium mandibular implant and its bone equivalent

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Figure 13

Model 1 von Mises stresses under masticatory load

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Figure 14

Model 2 von Mises stresses—maximum stresses seen at the screw joints

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Figure 15

Model 3 von Mises stresses—maximum stresses seen at the screw joints

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Figure 16

von Mises stress in the finalized design for model 2c

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Figure 17

Final model 3b von Mises stresses

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Figure 18

Models 3a and 3b comparison von Mises stress

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Figure 19

Maximum displacement for effective elastic modulus—3 GPa for Model 3

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Figure 20

CAD design of porous mandible for 3D printing

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Figure 21

3DP model of porous mandible

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Figure 22

Porous titanium parts fabricated with EBM

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