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Stress distribution in mandibular donor site after harvesting bone grafts of various sizes from the ascending ramus of a dentate mandible by finite element analysis

  • Stephan Christian Möhlhenrich
  • Kristian Kniha
  • József Szalma
  • Nassim Ayoub
  • Frank Hölzle
  • Michael Wolf
  • Ali Modabber
  • Stefan Raith
Original Article
  • 47 Downloads

Abstract

Purpose

Harvesting bone from the ascending ramus of the mandible is a common procedure. However, mandibular fracture may occur after grafting bone blocks. This study aimed to investigate the resulting force distribution of stress and strain in the mandibular donor site after harvesting bone grafts of different sizes and various loadings.

Methods

Finite element analysis was performed for virtual harvesting of bone blocks of nine different sizes between 15 × 20 and 25 × 30 mm and three different chewing loads (incisal, ipsilateral and contralateral). von Mises stress and first principal stress distributions were measured.

Results

von Mises stress was distributed between 35.01 (10 × 15 mm graft, incisal load) and 333.25 MPa (30 × 20 mm graft ipsilateral load), whereas first principal stress distributions were between 48.27 (10 × 15 mm graft, incisal load) and 414.69 MPa (30 × 20 mm graft ipsilateral load). In general, the least stress was observed with incisal load followed by ipsilateral load and finally contralateral load. The critical value of 133 MPa was found after removing almost all grafts with a width of 20 or 30 mm.

Conclusions

Incisal loading led to less stress compared with contralateral and ipsilateral loads. Increasing graft size led to increasing weakness of the donor site. Graft width exerted a greater influence on stress development than its height.

Clinical relevance

Ipsilateral chewing and increasing width of the bone graft result in maximum stress in the mandibular donor side, and critical values regarding to the possibility of fractures are already to expect from a graft size of 20 × 15 mm.

Keywords

Mandibular donor site Dentate mandible Finite element analysis Chewing load Stress distribution 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent

For this type of study, formal consent is not required.

Disclosure

The authors do not have any financial interests or commercial associations to disclose.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Stephan Christian Möhlhenrich
    • 1
    • 2
  • Kristian Kniha
    • 2
  • József Szalma
    • 3
  • Nassim Ayoub
    • 2
  • Frank Hölzle
    • 2
  • Michael Wolf
    • 1
  • Ali Modabber
    • 2
  • Stefan Raith
    • 2
  1. 1.Department of Orthodontics and Dentofacial OrthopedicsRWTH Aachen University HospitalAachenGermany
  2. 2.Department of Oral and Maxillofacial SurgeryUniversity Hospital of AachenAachenGermany
  3. 3.Department of Oral and Maxillofacial SurgeryUniversity of PecsPecsHungary

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