BioCAD techniques

Kemmoku, Daniel Takanori; Laureti, C; Noritomi, Pedro Yoshito; Silva, J

doi:10.1201/b11341-113

Cited by 2 publications

(3 citation statements)

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“…The next step was to reconstruct the NURBS (non-uniform rational Bspline) surfaces from mesh with precision. For that, the BioCAD method [32] was applied and the anatomical lines of the surface were created. The pre-processing phase is summarized in a flowchart (Fig 1).…”

Section: Pre-processingmentioning

confidence: 99%

Stress distribution on different bar materials in implant-retained palatal obturator

et al. 2020

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Implant-retained custom-milled framework enhances the stability of palatal obturator prostheses. Therefore, to evaluate the mechanical response of implant-retained obturator prostheses with bar-clip attachment and milled bars, in three different materials under two load incidences were simulated. A maxilla model which Type IIb maxillary defect received five external hexagon implants (4.1 x 10 mm). An implant-supported palatal obturator prosthesis was simulated in three different materials: polyetheretherketone (PEEK), titanium (Ti:90%, Al:6%, V:4%) and Co-Cr (Co:60.6%, Cr:31.5%, Mo:6%) alloys. The model was imported into the analysis software and divided into a mesh composed of nodes and tetrahedral elements. Each material was assumed isotropic, elastic and homogeneous and all contacts were considered ideal. The bone was fixed and the load was applied in two different regions for each material: at the palatal face (cingulum area) of the central incisors (100 N magnitude at 45°); and at the occlusal surface of the first left molar (150 N magnitude normal to the surface). The microstrain and von-Mises stress were selected as criteria for analysis. The posterior load showed a higher strain concentration in the posterior peri-implant tissue, near the load application side for cortical and cancellous bone, regardless the simulated material. The anterior load showed a lower strain concentration with reduced magnitude and more implants involving in the load dissipation. The stress peak was calculated during posterior loading, which 77.7 MPa in the prosthetic screws and 2,686 με microstrain in the cortical bone. For bone tissue and bar, the material stiffness was inversely proportional to the calculated microstrain and stress. However, for the prosthetic screws and implants the PEEK showed higher stress concentration than the other materials. PEEK showed a promising behavior for the bone tissue and for the integrity of the bar and bar-clip attachments. However, the stress concentration in the prosthetic screws may represent an increase in failure risk. The use of Co-Cr alloy can reduce the stress in the prosthetic screw; however, it increases the bone strain; while the Titanium showed an intermediate behavior.

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Section: Pre-processingmentioning

confidence: 99%

Stress distribution on different bar materials in implant-retained palatal obturator

et al. 2020

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“…This allows rapid clinical implementation of an approach premised on customizable implant geometry for each patient, limited only by the capability to map and scan the targeted area. [35] In the future, bioprinting will have more of an impact in tissue engineering as the field ascends towards the development of scaffolds with more structural complexity. Naturally occurring organs have very complex physical structures, comprising different types of tissues, ligaments and tendons, cartilage, bone, and connective ECM.…”

Section: Discussionmentioning

confidence: 99%

“…For tissue engineering, software can be applied to design the scaffold with the porosity and mesh size according to the specification determined by the end user. [35] In addition, the software can prescribe the precise geometry of the product based either on end-user specifications from a CAD file, or on geometric data generated from 2D slices using a scanning medical imaging device such as a magnetic resonance imaging (MRI) station or a computed tomography (CT) scanner. After the CAD file has been prepared, the scaffold design is translated into a 3D object using AM.…”

Section: Scaffold Fabrication Methodsmentioning

confidence: 99%

Bioprinting and Tissue Engineering: Recent Advances and Future Perspectives

Seliktar¹,

Dikovsky²,

Napadensky³

2013

Israel Journal of Chemistry

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Bioprinting in tissue engineering applies 3D printing technologies towards the development of precisely designed scaffolds for tissue repair and organ replacement. The printed scaffolds may incorporate polymeric constituents together with biological payloads, including cells and biochemically active additives. The scaffolds can be designed with spatial precision, achieving both biochemical and biophysical heterogeneity that mimic the extracellular environment of the body’s tissues. Recent advances in 3D bioprinting have applied a strategy of controlling physical properties together with bioactivity to influence specific interactions with cellular systems, including spatial and temporal patterns of biochemical and biomechanical cues that regulate cell behavior and improve tissue integration. Important new advances in tissue engineering have now been realized based on these approaches, and clinical applications for printed scaffolds continue to drive further improvements to 3D bioprinter technologies.

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BioCAD techniques

Cited by 2 publications

References 1 publication

Stress distribution on different bar materials in implant-retained palatal obturator

Stress distribution on different bar materials in implant-retained palatal obturator

Bioprinting and Tissue Engineering: Recent Advances and Future Perspectives

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