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      Improving 3D photogrammetry models through spectral imaging: Tooth enamel as a case study

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          Abstract

          Reflective or translucent materials are a challenge to digitize in 3D. Results are better with a matt coating although objects from museum collections are often too fragile or too valuable to be treated in this way. It is therefore essential that alternative solutions are found. This study analyzed spectral photogrammetry as a possible solution. Spectral photogrammetry is an emerging technique which uses images at different wavelengths to create 3D models. Tooth enamel is a challenging material to digitize. Six sets of teeth were photographed at different wavelengths. The results showed that the quality of the models enamels parts improved when taken with ultraviolet wavelengths whilst models were less accurate when photogrammetry was performed with the red and infrared spectrum. This can be explained by the optical properties of enamel. This study demonstrates that knowing the optical properties of a material beforehand could help future photogrammetric digitization of challenging materials.

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          Most cited references32

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          From medical imaging data to 3D printed anatomical models

          Anatomical models are important training and teaching tools in the clinical environment and are routinely used in medical imaging research. Advances in segmentation algorithms and increased availability of three-dimensional (3D) printers have made it possible to create cost-efficient patient-specific models without expert knowledge. We introduce a general workflow that can be used to convert volumetric medical imaging data (as generated by Computer Tomography (CT)) to 3D printed physical models. This process is broken up into three steps: image segmentation, mesh refinement and 3D printing. To lower the barrier to entry and provide the best options when aiming to 3D print an anatomical model from medical images, we provide an overview of relevant free and open-source image segmentation tools as well as 3D printing technologies. We demonstrate the utility of this streamlined workflow by creating models of ribs, liver, and lung using a Fused Deposition Modelling 3D printer.
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            The use of close-range photogrammetry in zooarchaeology: Creating accurate 3D models of wolf crania to study dog domestication

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              Nanomaterials for Tissue Engineering In Dentistry

              The tissue engineering (TE) of dental oral tissue is facing significant changes in clinical treatments in dentistry. TE is based on a stem cell, signaling molecule, and scaffold triad that must be known and calibrated with attention to specific sectors in dentistry. This review article shows a summary of micro- and nanomorphological characteristics of dental tissues, of stem cells available in the oral region, of signaling molecules usable in TE, and of scaffolds available to guide partial or total reconstruction of hard, soft, periodontal, and bone tissues. Some scaffoldless techniques used in TE are also presented. Then actual and future roles of nanotechnologies about TE in dentistry are presented.
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                Author and article information

                Contributors
                Role: ConceptualizationRole: Data curationRole: Formal analysisRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: ConceptualizationRole: Funding acquisitionRole: Project administrationRole: ResourcesRole: SupervisionRole: ValidationRole: Writing – review & editing
                Role: ConceptualizationRole: Writing – review & editing
                Role: Funding acquisitionRole: Project administrationRole: Supervision
                Role: Editor
                Journal
                PLoS One
                PLoS ONE
                plos
                plosone
                PLoS ONE
                Public Library of Science (San Francisco, CA USA )
                1932-6203
                13 August 2019
                2019
                : 14
                : 8
                : e0220949
                Affiliations
                [1 ] Biological Collection and Data Management, Royal Museum for Central Africa, Tervuren, Belgium
                [2 ] Scientific Heritage Service, Royal Belgian Institute of Natural Sciences, Brussels, Belgium
                Universidade Federal de Uberlandia, BRAZIL
                Author notes

                Competing Interests: The authors have declared that no competing interests exist.

                Author information
                http://orcid.org/0000-0002-3884-4853
                Article
                PONE-D-18-32200
                10.1371/journal.pone.0220949
                6692069
                31408481
                aa47bcae-28f0-41bc-b04d-60892a152e9b
                © 2019 Mathys et al

                This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                History
                : 8 November 2018
                : 28 July 2019
                Page count
                Figures: 34, Tables: 2, Pages: 33
                Funding
                The study is part of the research project BR/175/PI/3DSPECTRAL funded by the Belgian Scientific Policy ( http://belspo.be/). Project leader is DV.
                Categories
                Research Article
                Physical Sciences
                Physics
                Electromagnetic Radiation
                Light
                Visible Light
                White Light
                Biology and Life Sciences
                Anatomy
                Digestive System
                Teeth
                Medicine and Health Sciences
                Anatomy
                Digestive System
                Teeth
                Biology and Life Sciences
                Anatomy
                Head
                Jaw
                Teeth
                Medicine and Health Sciences
                Anatomy
                Head
                Jaw
                Teeth
                Physical Sciences
                Materials Science
                Materials
                Optical Materials
                Research and Analysis Methods
                Imaging Techniques
                Neuroimaging
                Computed Axial Tomography
                Biology and Life Sciences
                Neuroscience
                Neuroimaging
                Computed Axial Tomography
                Medicine and Health Sciences
                Diagnostic Medicine
                Diagnostic Radiology
                Tomography
                Computed Axial Tomography
                Research and Analysis Methods
                Imaging Techniques
                Diagnostic Radiology
                Tomography
                Computed Axial Tomography
                Medicine and Health Sciences
                Radiology and Imaging
                Diagnostic Radiology
                Tomography
                Computed Axial Tomography
                Physical Sciences
                Physics
                Electromagnetic Radiation
                Light
                Physical Sciences
                Physics
                Electromagnetic Radiation
                Light
                Visible Light
                Engineering and Technology
                Equipment
                Optical Equipment
                Optical Lenses
                Physical Sciences
                Materials Science
                Material Properties
                Optical Properties
                Custom metadata
                All relevant data are within the manuscript.

                Uncategorized
                Uncategorized

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