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. 2021 Nov 5;16(11):e0259363.
doi: 10.1371/journal.pone.0259363. eCollection 2021.

Tensile modulus of human orbital wall bones cut in sagittal and coronal planes

Krzysztof Zerdzicki  1 , Pawel Lemski  2 , Pawel Klosowski  1 , Andrzej Skorek  2 , Marcin Zmuda Trzebiatowski  1 , Mateusz Koberda  3
Affiliations

Tensile modulus of human orbital wall bones cut in sagittal and coronal planes

Krzysztof Zerdzicki et al. PLoS One. .

Abstract

In the current research, 68 specimens of orbital superior and/or medial walls taken from 33 human cadavers (12 females, 21 males) were subjected to uniaxial tension untill fracture. The samples were cut in the coronal (38 specimens) and sagittal (30 specimens) planes of the orbital wall. Apparent density (ρapp), tensile Young's modulus (E-modulus) and ultimate tensile strength (UTS) were identified. Innovative test protocols were used to minimize artifacts and analyze the obtained data: (1) grips dedicated to non-symmetrical samples clamping were applied for mechanical testing, (2) non-contact measuring system of video-extensometer was employed for displacement registration, (3) ink imprint technique coupled with CAD analysis was applied to precisely access the cross-sectional areas of tested samples. With regard to a pooled group, apparent density for the coronal and sagittal cut plane was equal 1.53 g/cm3 and 1.57 g/cm3, tensile Young's modulus 2.36 GPa and 2.14 GPa, and ultimate tensile strength 12.66 MPa and 14.35 MPa, respectively. No significant statistical differences (p > 0.05) were found for all the analyzed parameters when comparing coronal and sagittal plane cut groups. These observations confirmed the hypothesis that direction of sample cut does not affect the mechanical response of the orbital wall tissue, thus suggesting that mechanical properties of orbital wall bone show isotropic character.

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Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Fig 1
Fig 1. Box plots of age differences between particular gender groups and with a split for the coronal and sagittal plane cut.
Fig 2
Fig 2. Grips dedicated for asymmetrically shaped samples.
Fig 3
Fig 3. White markers followed by the video extensometer during test realization.
Fig 4
Fig 4. Specimen cut with the surgeon clippers and cross-section of both parts imprinted by ink on non-soaking technical fabric material.
Fig 5
Fig 5. Typical stress-strain curve obtained for orbital wall bone.
The red line indicates the linear part of the curve and its slope corresponds to Young’s modulus.
Fig 6
Fig 6. Box plots of density differences between particular gender groups and with a split for the coronal and sagittal plane cut.
Fig 7
Fig 7. Box plots of ultimate tensile stress (UTS) differences between particular gender groups and with a split for the coronal and sagittal plane cut.
Fig 8
Fig 8. Box plots of tensile (Young) modulus differences between particular gender groups and with a split for the coronal and sagittal plane cut.
See this image and copyright information in PMC

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