Publication detail

Finite element analysis of customized reconstruction plates for mandibular continuity defect therapy

NARRA, N. VALÁŠEK, J. HANNULA, M. MARCIÁN, P. SÁNDOR, G. HYTTINEN, J. WOLFF, J.

Original Title

Finite element analysis of customized reconstruction plates for mandibular continuity defect therapy

Type

journal article in Web of Science

Language

English

Original Abstract

Large mandibular continuity defects pose a significant challenge in oral maxillofacial surgery. One solution to this problem is to use computer-guided surgical planning and additive manufacturing technology to produce patient-specific reconstruction plates. However, when designing customised plates, it is important to assess potential biomechanical responses that may vary substantially depending on the size and geometry of the defect. The aim of this study was to assess the design of two customized plates using finite element method (FEM). These plates were designed for the reconstruction of the lower left mandibles of two ameloblastoma cases (patient1/plate1 and patient2/plate2) with large bone resections differing in both geometry and size. Simulations revealed maximum von Mises stresses of 63 MPa and 108 MPa in plates 1 and 2, and 65 MPa and 190 MPa in the fixation screws of patients 1 and 2. The von Mises strain induced in the bone at the screw-bone interface reached maximum values of 2739 micro-strain for patient 1 and 19575 micro-strain for patient 2. The results demonstrate the influence of design on the stresses induced in the plate and screw bodies. Of particular note, however, are the differences in the induced strains. Unphysiologically high strains in bone adjacent to screws can cause micro-damage leading to bone resorption. This can adversely affect the anchoring capabilities of the screws. Thus, while custom plates offer optimal anatomical fit, attention should be paid to the expected Physiological forces on the plates and the induced stresses and strains in the plate-screw-bone assembly.

Keywords

reconstruction plate; finite element analysis; mandible reconstruction; rapid prototyping; maxillofacial surgery

Authors

NARRA, N.; VALÁŠEK, J.; HANNULA, M.; MARCIÁN, P.; SÁNDOR, G.; HYTTINEN, J.; WOLFF, J.

RIV year

2014

Released

3. 1. 2014

Publisher

ELSEVIER SCI LTD

Location

ENGLAND, OXFORD

ISBN

0021-9290

Periodical

JOURNAL OF BIOMECHANICS

Year of study

47

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

264

Pages to

268

Pages count

6

URL

http://www.sciencedirect.com/science/article/pii/S002192901300568X

BibTex

@article{BUT102650,
  author="Nathaniel {Narra} and Jiří {Valášek} and Markus {Hannula} and Petr {Marcián} and George {Sándor} and Jari {Hyttinen} and Jan {Wolff}",
  title="Finite element analysis of customized reconstruction plates for mandibular continuity defect therapy",
  journal="JOURNAL OF BIOMECHANICS",
  year="2014",
  volume="47",
  number="1",
  pages="264--268",
  doi="10.1016/j.jbiomech.2013.11.016",
  issn="0021-9290",
  url="http://www.sciencedirect.com/science/article/pii/S002192901300568X"
}