Comparative finite element analysis of skull mechanical properties following parietal bone graft harvesting in adults

Haen, P.; Dubois, Guillaume; Goudot, P.; Schouman, Thomas

doi:10.1016/j.jcms.2017.11.020

Cited by 8 publications

(4 citation statements)

References 38 publications

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“…Moreover, compared to the PMMA and PEEK implant materials used in their study, the Ti6Al4V material illustrated the lowest displacement. Furthermore, as indicated in Fig 6(a), the maximum stress on all cases was located at the center of the implant where the static force was applied, which is in agreement with the work reported by Haen et al 28) . The safety factor was considered in this study to determine which material and pore size of the implant is suitable to be used.…”

Section: Discussionsupporting

confidence: 91%

The Influence of Pore Size and Material Properties on Biomechanical Analysis of Parietal-Temporal Implant

Dagang¹,

Marwan²,

Mahmud³

et al. 2021

Evergreen

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This study aimed to analyze the biomechanical behavior of the cranial implant by varying materials (titanium, hydroxyapatite, and zinc-hydroxyapatite) and pore size (600, 900, and 1200 μm) through a finite element method since there is a lack of study on this area. The cranial implant was reconstructed from the DICOM images, and the biomechanical behavior was evaluated in terms of Von Mises stress and deformation. The maximum Von Mises stress was primarily influenced by pore size in this study. Meanwhile, the material properties had the greatest influence on the implant's deformation. Subsequently, the safety factor was considered, and titanium implant with a pore size of 900 µm showed excellent results.

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Section: Discussionsupporting

confidence: 91%

The Influence of Pore Size and Material Properties on Biomechanical Analysis of Parietal-Temporal Implant

Dagang¹,

Marwan²,

Mahmud³

et al. 2021

Evergreen

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“…The maximum deformation of the pore size of 1200 µm increases greatly resulted by the sharp increase of maximum stress exerted. Similar to the study done by Haen et al [24] on the temporal region, the maximum stress and deformation of the cranial implant are highest at the location where the load is applied. Figure 16 shows the maximum stress and deformation experienced by the skull with implants of different pore sizes.…”

Section: Resultssupporting

confidence: 80%

Effects of Pentagonal Pore Sizes in the Zinc Hydroxyapatite Parietal-Temporal Implant

Dagang¹,

Hamdi²,

Marwan³

et al. 2021

IJETAE

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To reconstruct the fractured skull, affected patients are advised to undergo cranioplasty, which is a surgical procedure to repair the cranial defect by implanting materials such as autologous bone grafts or synthetic alloplastic materials. The use of synthetic alloplastic materials such as hydroxyapatite (HA) has been widely accepted due to their biocompatibility and suitability for larger cranial defects. The zinc hydroxyapatite (ZnHA) material is favourable as HA mimics 60% of the actual human bone, whereas zinc helps to improve its biomechanical properties. The purpose of this study is to construct the ZnHA cranial implant with different pore sizes of 600, 900, and 1200 µm in pentagonal shapes and to study its mechanical performance. At the end of the research, it was found that the implant with a pore size of 900 µm is the most appropriate implant to be utilized without affecting its mechanical performance. Aspects such as the deformation and von Mises stress are discussed to assist on the development of the ZnHA cranial implant. Keywords — Biomechanical analysis, cranial implant, finite element analysis, pore size, zinc hydroxyapatite

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“…In another study, the mean fracture force caused by a drop tower for the temporoparietal region with a circular plate was 5195 ± 1801 N and for the parietal region with a rectangular plate was 12,390 ± 3654 N [ 45 ]. These measurements were conducted on intact skulls with different methodological approaches however some authors have noted that the cranial strength decreases after graft harvesting from the outer or inner parietal bone layers [ 46 , 47 ]. As a result, the mechanical strength of the skull is reduced when bone integrity is disturbed after traumatic injury, and the fracture force is consequently lower.…”

Section: Discussionmentioning

confidence: 99%

Biomechanical Evaluation of Patient-Specific Polymethylmethacrylate Cranial Implants for Virtual Surgical Planning: An In-Vitro Study

et al. 2022

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Cranioplasty with freehand-molded polymethylmethacrylate implants is based on decades of experience and is still frequently used in clinical practice. However, data confirming the fracture toughness and standard biomechanical tests are rare. This study aimed to determine the amount of force that could be applied to virtually planned, template-molded, patient-specific implants (n = 10) with an implant thickness of 3 mm, used in the treatment of a temporoparietal skull defect (91.87 cm2), until the implant cracks and finally breaks. Furthermore, the influence of the weight and porosity of the implant on its force resistance was investigated. The primary outcome showed that a high force was required to break the implant (mean and standard deviation 1484.6 ± 167.7 N), and this was very strongly correlated with implant weight (Pearson’s correlation coefficient 0.97; p < 0.001). Secondary outcomes were force application at the implant's first, second, and third crack. Only a moderate correlation could be found between fracture force and the volume of porosities (Pearson’s correlation coefficient 0.59; p = 0.073). The present study demonstrates that an implant thickness of 3 mm for a temporoparietal skull defect can withstand sufficient force to protect the brain. Greater implant weight and, thus, higher material content increases thickness, resulting in more resistance. Porosities that occur during the described workflow do not seem to reduce resistance. Therefore, precise knowledge of the fracture force of polymethylmethacrylate cranial implants provides insight into brain injury prevention and serves as a reference for the virtual design process.

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Comparative finite element analysis of skull mechanical properties following parietal bone graft harvesting in adults

Cited by 8 publications

References 38 publications

The Influence of Pore Size and Material Properties on Biomechanical Analysis of Parietal-Temporal Implant

The Influence of Pore Size and Material Properties on Biomechanical Analysis of Parietal-Temporal Implant

Effects of Pentagonal Pore Sizes in the Zinc Hydroxyapatite Parietal-Temporal Implant

Biomechanical Evaluation of Patient-Specific Polymethylmethacrylate Cranial Implants for Virtual Surgical Planning: An In-Vitro Study

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