Refinements in osteotomy design to improve structural integrity: A finite element analysis study

P. Bujtar, János Simonovics, K. Váradi, George K B Sándor, Jingzhe Pan, C. M E Avery

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Osteotomy cuts are typically made using a saw, and the meeting point acts as a focus for the concentration of stress and failure. We have studied the impact of different designs of osteotomy cut. Cadaver sheep tibias were scanned by computed tomography (CT) and transformed into a computer-aided design (CAD) model. A standard marginal resection defect was created and then modified, and a finite element analysis made. The relative stress concentrations at the intersection of osteotomy cuts were recorded using principal stresses S1, S3, and von Mises stress, von Mises under both 4-point bending and torsion testing. The osteotomy designs studied were: right-angled and bevelled osteotomy end cuts, overcutting, and a stop drill hole. Peak stress values for 4-point bending and torsion were 24-30% greater at the right-angled osteotomy than the bevelled end cut. Overcutting dramatically increased peak stress values caused by bending and torsion by 48% and 71%, respectively. Substantially lower concentrations of stress were noted with a stop hole using both a 90 (bending 38% and torsion 56%), and a tangential (bending 58% and torsion 60%) cut. A bevelled osteotomy has substantially lower concentrations of stress than a right-angled osteotomy. It is important to avoid creating an overcut as this causes an appreciable increase in the concentration of stress, while a stop drill hole substantially reduces the stress. The creation of a stop hole and the use of judicious bevelling techniques are modifications in the design of an osteotomy that are readily applicable to surgical practice.

Original languageEnglish
Pages (from-to)479-485
Number of pages7
JournalBritish Journal of Oral and Maxillofacial Surgery
Volume51
Issue number6
DOIs
Publication statusPublished - Sep 2013

Fingerprint

Finite Element Analysis
Osteotomy
Computer-Aided Design
Tibia
Cadaver
Sheep
Tomography

Keywords

  • CAD model
  • Finite element analysis
  • Morbidity
  • Osteotomy
  • Overcut
  • Radius
  • Sheep tibia
  • Stop hole

ASJC Scopus subject areas

  • Oral Surgery
  • Otorhinolaryngology
  • Surgery

Cite this

Refinements in osteotomy design to improve structural integrity : A finite element analysis study. / Bujtar, P.; Simonovics, János; Váradi, K.; Sándor, George K B; Pan, Jingzhe; Avery, C. M E.

In: British Journal of Oral and Maxillofacial Surgery, Vol. 51, No. 6, 09.2013, p. 479-485.

Research output: Contribution to journalArticle

Bujtar, P. ; Simonovics, János ; Váradi, K. ; Sándor, George K B ; Pan, Jingzhe ; Avery, C. M E. / Refinements in osteotomy design to improve structural integrity : A finite element analysis study. In: British Journal of Oral and Maxillofacial Surgery. 2013 ; Vol. 51, No. 6. pp. 479-485.
@article{6c8729d29cc24262a0c1434318333922,
title = "Refinements in osteotomy design to improve structural integrity: A finite element analysis study",
abstract = "Osteotomy cuts are typically made using a saw, and the meeting point acts as a focus for the concentration of stress and failure. We have studied the impact of different designs of osteotomy cut. Cadaver sheep tibias were scanned by computed tomography (CT) and transformed into a computer-aided design (CAD) model. A standard marginal resection defect was created and then modified, and a finite element analysis made. The relative stress concentrations at the intersection of osteotomy cuts were recorded using principal stresses S1, S3, and von Mises stress, von Mises under both 4-point bending and torsion testing. The osteotomy designs studied were: right-angled and bevelled osteotomy end cuts, overcutting, and a stop drill hole. Peak stress values for 4-point bending and torsion were 24-30{\%} greater at the right-angled osteotomy than the bevelled end cut. Overcutting dramatically increased peak stress values caused by bending and torsion by 48{\%} and 71{\%}, respectively. Substantially lower concentrations of stress were noted with a stop hole using both a 90 (bending 38{\%} and torsion 56{\%}), and a tangential (bending 58{\%} and torsion 60{\%}) cut. A bevelled osteotomy has substantially lower concentrations of stress than a right-angled osteotomy. It is important to avoid creating an overcut as this causes an appreciable increase in the concentration of stress, while a stop drill hole substantially reduces the stress. The creation of a stop hole and the use of judicious bevelling techniques are modifications in the design of an osteotomy that are readily applicable to surgical practice.",
keywords = "CAD model, Finite element analysis, Morbidity, Osteotomy, Overcut, Radius, Sheep tibia, Stop hole",
author = "P. Bujtar and J{\'a}nos Simonovics and K. V{\'a}radi and S{\'a}ndor, {George K B} and Jingzhe Pan and Avery, {C. M E}",
year = "2013",
month = "9",
doi = "10.1016/j.bjoms.2012.09.015",
language = "English",
volume = "51",
pages = "479--485",
journal = "British Journal of Oral and Maxillofacial Surgery",
issn = "0266-4356",
publisher = "Churchill Livingstone",
number = "6",

}

TY - JOUR

T1 - Refinements in osteotomy design to improve structural integrity

T2 - A finite element analysis study

AU - Bujtar, P.

AU - Simonovics, János

AU - Váradi, K.

AU - Sándor, George K B

AU - Pan, Jingzhe

AU - Avery, C. M E

PY - 2013/9

Y1 - 2013/9

N2 - Osteotomy cuts are typically made using a saw, and the meeting point acts as a focus for the concentration of stress and failure. We have studied the impact of different designs of osteotomy cut. Cadaver sheep tibias were scanned by computed tomography (CT) and transformed into a computer-aided design (CAD) model. A standard marginal resection defect was created and then modified, and a finite element analysis made. The relative stress concentrations at the intersection of osteotomy cuts were recorded using principal stresses S1, S3, and von Mises stress, von Mises under both 4-point bending and torsion testing. The osteotomy designs studied were: right-angled and bevelled osteotomy end cuts, overcutting, and a stop drill hole. Peak stress values for 4-point bending and torsion were 24-30% greater at the right-angled osteotomy than the bevelled end cut. Overcutting dramatically increased peak stress values caused by bending and torsion by 48% and 71%, respectively. Substantially lower concentrations of stress were noted with a stop hole using both a 90 (bending 38% and torsion 56%), and a tangential (bending 58% and torsion 60%) cut. A bevelled osteotomy has substantially lower concentrations of stress than a right-angled osteotomy. It is important to avoid creating an overcut as this causes an appreciable increase in the concentration of stress, while a stop drill hole substantially reduces the stress. The creation of a stop hole and the use of judicious bevelling techniques are modifications in the design of an osteotomy that are readily applicable to surgical practice.

AB - Osteotomy cuts are typically made using a saw, and the meeting point acts as a focus for the concentration of stress and failure. We have studied the impact of different designs of osteotomy cut. Cadaver sheep tibias were scanned by computed tomography (CT) and transformed into a computer-aided design (CAD) model. A standard marginal resection defect was created and then modified, and a finite element analysis made. The relative stress concentrations at the intersection of osteotomy cuts were recorded using principal stresses S1, S3, and von Mises stress, von Mises under both 4-point bending and torsion testing. The osteotomy designs studied were: right-angled and bevelled osteotomy end cuts, overcutting, and a stop drill hole. Peak stress values for 4-point bending and torsion were 24-30% greater at the right-angled osteotomy than the bevelled end cut. Overcutting dramatically increased peak stress values caused by bending and torsion by 48% and 71%, respectively. Substantially lower concentrations of stress were noted with a stop hole using both a 90 (bending 38% and torsion 56%), and a tangential (bending 58% and torsion 60%) cut. A bevelled osteotomy has substantially lower concentrations of stress than a right-angled osteotomy. It is important to avoid creating an overcut as this causes an appreciable increase in the concentration of stress, while a stop drill hole substantially reduces the stress. The creation of a stop hole and the use of judicious bevelling techniques are modifications in the design of an osteotomy that are readily applicable to surgical practice.

KW - CAD model

KW - Finite element analysis

KW - Morbidity

KW - Osteotomy

KW - Overcut

KW - Radius

KW - Sheep tibia

KW - Stop hole

UR - http://www.scopus.com/inward/record.url?scp=84881310086&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84881310086&partnerID=8YFLogxK

U2 - 10.1016/j.bjoms.2012.09.015

DO - 10.1016/j.bjoms.2012.09.015

M3 - Article

C2 - 23084459

AN - SCOPUS:84881310086

VL - 51

SP - 479

EP - 485

JO - British Journal of Oral and Maxillofacial Surgery

JF - British Journal of Oral and Maxillofacial Surgery

SN - 0266-4356

IS - 6

ER -