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https://www.readbyqxmd.com/read/28917880/intercalated-chitosan-hydroxyapatite-nanocomposites-promising-materials-for-bone-tissue-engineering-applications
#1
Muhammad Anwaar Nazeer, Emel Yilgör, Iskender Yilgör
Preparation and characterization of chitosan/hydroxyapatite (CS/HA) nanocomposites displaying an intercalated structure is reported. Hydroxyapatite was synthesized through sol-gel process. Formic acid was introduced as a new solvent to obtain stable dispersions of nano-sized HA particles in polymer solution. CS/HA dispersions with HA contents of 5, 10 and 20% by weight were prepared. Self-assembling of HA nanoparticles during the drying of the solvent cast films led to the formation of homogeneous CS/HA nanocomposites...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28888410/three-dimensional-printing-in-contemporary-fixed-prosthodontics-a-technique-article
#2
Sarah Bukhari, Brian J Goodacre, Abdulaziz AlHelal, Mathew T Kattadiyil, Paul M Richardson
Digital dentistry has gained in popularity among clinicians and laboratory technicians because of its versatile applications. Three-dimensional (3D) printing has been applied in many areas of dentistry as it offers efficiency, affordability, accessibility, reproducibility, speed, and accuracy. This article describes a technique where 3D printing is used to fabricate a die-trimmed cast and to replicate gingival tissue and implant analogs. The digital workflow that replaces the conventional laboratory procedure is outlined...
September 6, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28887492/freeform-fabrication-of-tissue-simulating-phantom-for-potential-use-of-surgical-planning-in-conjoined-twins-separation-surgery
#3
Shuwei Shen, Haili Wang, Yue Xue, Li Yuan, Ximing Zhou, Zuhua Zhao, Erbao Dong, Bin Liu, Wendong Liu, Barrett Cromeens, Brent Adler, Gail Besner, Ronald X Xu
Preoperative assessment of tissue anatomy and accurate surgical planning is crucial in conjoined twin separation surgery. We developed a new method that combines three-dimensional (3D) printing, assembling, and casting to produce anatomic models of high fidelity for surgical planning. The related anatomic features of the conjoined twins were captured by computed tomography (CT), classified as five organ groups, and reconstructed as five computer models. Among these organ groups, the skeleton was produced by fused deposition modeling (FDM) using acrylonitrile-butadiene-styrene...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28885295/morphometric-analysis-of-rat-spinal-cord-angioarchitecture-by-phase-contrast-radiography-from-2d-to-3d-visualization
#4
Tianding Wu, Yong Cao, Shuangfei Ni, Zixiang Luo, Liyuan Jiang, Hongbin Lu, Jianzhong Hu
STUDY DESIGN: An advanced imaging of vasculature with synchrotron radiation X-ray in a rat model. OBJECTIVE: To develop the potential for quantitative assessment of vessel network from 2D to 3D visualization by synchrotron radiation X-ray phase contrast tomography (XPCT) in rat spinal cord model. SUMMARY OF BACKGROUND DATA: Investigation of microvasculature contributes to the understanding of pathological development of spinal cord injury...
September 6, 2017: Spine
https://www.readbyqxmd.com/read/28879329/creating-protective-appliances-for-preventing-dental-injury-during-endotracheal-intubation-using-intraoral-scanning-and-3d-printing-a-technical-note
#5
Jin-Hyung Cho, Wonse Park, Kyeong-Mee Park, Seo-Yul Kim, Kee-Deog Kim
Digital dentistry has influenced many dental procedures, such as three-dimensional (3D) diagnosis and treatment planning, surgical splints, and prosthetic treatments. Patient-specific protective appliances (PSPAs) prevent dental injury during endotracheal intubation. However, the required laboratory work takes time, and there is the possibility of tooth extraction while obtaining the dental impression. In this technical report, we utilized new digital technology for creating PSPAs, using direct intraoral scanners and 3D printers for dental cast fabrication...
March 2017: J Dent Anesth Pain Med
https://www.readbyqxmd.com/read/28866187/interconnected-porosity-analysis-by-3d-x-ray-microtomography-and-mechanical-behavior-of-biomimetic-organic-inorganic-composite-materials
#6
S Alonso-Sierra, R Velázquez-Castillo, B Millán-Malo, R Nava, L Bucio, A Manzano-Ramírez, H Cid-Luna, E M Rivera-Muñoz
Hydroxyapatite-based materials have been used for dental and biomedical applications. They are commonly studied due to their favorable response presented when used for replacement of bone tissue. Those materials should be porous enough to allow cell penetration, internal tissue growth, vascular incursion and nutrient supply. Furthermore, their morphology should be designed to guide the growth of new bone tissue in anatomically applicable ways. In this work, the mechanical performance and 3D X-ray microtomography (X-ray μCT) study of a biomimetic, organic-inorganic composite material, based on hydroxyapatite, with physicochemical, structural, morphological and mechanical properties very similar to those of natural bone tissue is reported...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28834394/3d-printing-hierarchical-silver-nanowire-aerogel-with-highly-compressive-resilience-and-tensile-elongation-through-tunable-poisson-s-ratio
#7
Pengli Yan, Emery Brown, Qing Su, Jun Li, Jian Wang, Changxue Xu, Chi Zhou, Dong Lin
Metallic aerogels have attracted intense attention due to their superior properties, such as high electrical conductivity, ultralow densities, and large specific surface area. The preparation of metal aerogels with high efficiency and controllability remains challenge. A 3D freeze assembling printing technique integrated with drop-on-demand inkjet printing and freeze casting are proposed for metallic aerogels preparation. This technique enables tailoring both the macrostructure and microstructure of silver nanowire aerogels (SNWAs) by integrating programmable 3D printing and freeze casting, respectively...
August 18, 2017: Small
https://www.readbyqxmd.com/read/28826784/accuracy-of-3-dimensional-virtual-surgical-simulation-combined-with-digital-teeth-alignment-a-pilot-study
#8
Jung-Hoon Kim, Young-Chel Park, Hyung-Seog Yu, Moon-Key Kim, Sang-Hoon Kang, Yoon Jeong Choi
PURPOSE: To evaluate the accuracy of virtual surgical simulation combined with digital teeth alignment and the applicability of this technique to the diagnosis and establishment of a 3-dimensional (3D) visualized treatment objective for orthognathic surgery by comparing virtual simulation images with actual post-treatment images. MATERIALS AND METHODS: This retrospective study included patients who underwent computed tomography (CT) before and after treatment. The 3D digital images were constructed from the initial CT images and dental cast scan data, and virtual surgical simulation combined with digital teeth alignment was performed...
July 26, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28826357/3d-printing-and-angiogenesis-tailored-agarose-type-i-collagen-blends-comprise-3d-printability-and-angiogenesis-potential-for-tissue-engineered-substitutes
#9
Franziska Kreimendahl, Marius Köpf, Anja Lena Thiebes, Daniela F Duarte Campos, Andreas Blaeser, Thomas Schmitz-Rode, Christian Apel, Stefan Jockenhoevel, Horst Fischer
3D bioprinting is a promising technology for manufacturing cell-laden tissue engineered constructs. Larger tissue substitutes, however, require a vascularized network to ensure nutrition supply. Therefore, tailored bioinks combining 3D printability and cell-induced vascularization are needed. We hypothesize that tailored hydrogel blends made of agarose-type I collagen and agarose-fibrinogen are 3D printable and will allow the formation of capillary-like structures by human umbilical vein endothelial cells and human dermal fibroblasts...
August 21, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28795156/results-of-ultrasound-assisted-brace-casting-for-adolescent-idiopathic-scoliosis
#10
Edmond H Lou, Doug L Hill, Andreas Donauer, Melissa Tilburn, Douglas Hedden, Marc Moreau
BACKGROUND: Four factors have been reported to affect brace treatment outcome: (1) growth or curve based risk, (2) the in-brace correction, (3) the brace wear quantity, and (4) the brace wear quality. The quality of brace design affects the in-brace correction and comfort which indirectly affects the brace wear quantity and quality. This paper reported the immediate benefits and results on using ultrasound (US) to aid orthotists to design braces for the treatment of scoliosis. METHODS: Thirty-four AIS subjects participated in this study with 17 (2 males, 15 females) in the control group and 17 (2 males, 15 females) in the intervention (US) group...
2017: Scoliosis and Spinal Disorders
https://www.readbyqxmd.com/read/28777314/artificial-auricular-cartilage-using-silk-fibroin-and-polyvinyl-alcohol-hydrogel
#11
Jung Min Lee, Md Tipu Sultan, Soon Hee Kim, Vijay Kumar, Yeung Kyu Yeon, Ok Joo Lee, Chan Hum Park
Several methods for auricular cartilage engineering use tissue engineering techniques. However, an ideal method for engineering auricular cartilage has not been reported. To address this issue, we developed a strategy to engineer auricular cartilage using silk fibroin (SF) and polyvinyl alcohol (PVA) hydrogel. We constructed different hydrogels with various ratios of SF and PVA by using salt leaching, silicone mold casting, and freeze-thawing methods. We characterized each of the hydrogels in terms of the swelling ratio, tensile strength, pore size, thermal properties, morphologies, and chemical properties...
August 4, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28774030/additive-manufacturing-of-biomedical-constructs-with-biomimetic-structural-organizations
#12
REVIEW
Xiao Li, Jiankang He, Weijie Zhang, Nan Jiang, Dichen Li
Additive manufacturing (AM), sometimes called three-dimensional (3D) printing, has attracted a lot of research interest and is presenting unprecedented opportunities in biomedical fields, because this technology enables the fabrication of biomedical constructs with great freedom and in high precision. An important strategy in AM of biomedical constructs is to mimic the structural organizations of natural biological organisms. This can be done by directly depositing cells and biomaterials, depositing biomaterial structures before seeding cells, or fabricating molds before casting biomaterials and cells...
November 9, 2016: Materials
https://www.readbyqxmd.com/read/28769065/highly-reusable-and-superhydrophobic-spongy-graphene-aerogels-for-efficient-oil-water-separation
#13
Yuanzheng Luo, Shenlin Jiang, Qi Xiao, Chuanliang Chen, Buyin Li
Graphene aerogels (GAs) are three-dimensional (3D) graphene sponges with unique wettability and have demonstrated the potential for reducing contamination from oil spills and chemical accidents. Herein, we report new polyurethane (PU) sponge-reinforced GAs with low surface energy, high sorption capacity and excellent recyclability for use as efficient oil sorbents. Spongy graphene aerogels (SGAs) with a hierarchical porous morphology were produced by simply freeze-casting reduced graphene oxide (rGO) to form compacted macroscale sponges...
August 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28750105/additive-manufacturing-techniques-in-prosthodontics-where-do-we-currently-stand-a-critical-review
#14
Nawal Alharbi, Daniel Wismeijer, Reham B Osman
PURPOSE: The aim of this article was to critically review the current application of additive manufacturing (AM)/3D-printing techniques in prosthodontics and to highlight the influence of various technical factors involved in different AM technologies. MATERIALS AND METHODS: A standard approach of searching MEDLINE, EMBASE, and Google Scholar databases was followed. The following search terms were used: (Prosth* OR Restoration) AND (Prototype OR Additive Manufacture* OR Compute* OR 3D-print* OR CAD/CAM) AND (Dentistry OR Dental)...
July 27, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28746489/three-dimensional-evaluation-of-mandibular-anterior-dental-crowding-in-digital-dental-casts
#15
Luciana Quintanilha Pires Fernandes, Livia Kelly Ferraz Nunes, Luana Santos Alves, Felipe de Assis Carvalho Ribeiro, Jonas Capelli
Introduction: Digital dental models provide a more accurate and comprehensive assessment of orthodontic cases. Although this technique is quite promising, there are few three-dimensional measurements methods described in the literature. Objective: The aim of this study was to propose a method for assessing the degree of mandibular anterior dental crowding in the three planes of space, using digital dental models. Methods: Thirty dental casts were selected and scanned by Maestro 3D Dental Scanner and imported by Geomagic Qualify 2013 software...
May 2017: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/28740969/an-in-vitro-study-comparing-the-accuracy-of-full-arch-casts-digitized-with-desktop-scanners
#16
Roxana Nowak, Christian Wesemann, Jan Robben, Jonas Muallah, Axel Bumann
OBJECTIVE: The purpose of this study was to evaluate the accuracy of full-arch scans using 11 different cast scanners. METHOD AND MATERIALS: Dental arch length (AL), intermolar width (IMW), and intercanine width (ICW) of the reference plaster casts were measured using a coordinate measuring machine (Zeiss O-Inspect 422). The master cast was subsequently scanned 37 times using 11 desktop scanners (3Shape R500, 3Shape R700, 3Shape R1000, 3Shape R2000, Medianetx grande, Medianetx colori, DentaCore CS ULTRA, Dentaurum OrthoX, Maestro 3D, Imetric IScan D104i, GC Aadva Lab Scan)...
July 20, 2017: Quintessence International
https://www.readbyqxmd.com/read/28740271/fabrication-of-a-3d-printing-definitive-obturator-prosthesis-a-clinical-report
#17
Theodoros Tasopoulos, Georgios Kouveliotis, Grigoris Polyzois, Vasiliki Karathanasi
INTRODUCTION: Digital technologies related to imaging and manufacturing provide the clinician with a wide variety of treatment options. Stereolithography (SLA) offers a simple and predictable way for an accurate reconstruction of congenital or acquired defects. CLINICAL CASE: A 65-years old cancer patient with non- keratinized squamous cell carcinoma of left maxillary sinus came for a prosthetic clinical evaluation. A bilateral maxillectomy was performed and the treatment plan included definite obturator prosthesis for the upper arch...
March 2017: Acta Stomatologica Croatica
https://www.readbyqxmd.com/read/28738248/the-reliability-and-validity-of-measurements-of-human-dental-casts-made-by-an-intra-oral-3d-scanner-with-conventional-hand-held-digital-callipers-as-the-comparison-measure
#18
Mithun Rajshekar, Roberta Julian, Anne-Marie Williams, Marc Tennant, Alex Forrest, Laurence J Walsh, Gary Wilson, Leigh Blizzard
AIM: Intra-oral 3D scanning of dentitions has the potential to provide a fast, accurate and non-invasive method of recording dental information. The aim of this study was to assess the reliability of measurements of human dental casts made using a portable intra-oral 3D scanner appropriate for field use. METHOD: Two examiners each measured 84 tooth and 26 arch features of 50 sets of upper and lower human dental casts using digital hand-held callipers, and secondly using the measuring tool provided with the Zfx IntraScan intraoral 3D scanner applied to the virtual dental casts...
September 2017: Forensic Science International
https://www.readbyqxmd.com/read/28732176/a-comprehensive-craniofacial-study-of-22q11-2-deletion-syndrome
#19
A Lewyllie, J Roosenboom, K Indencleef, P Claes, A Swillen, K Devriendt, C Carels, M Cadenas De Llano-Pérula, G Willems, G Hens, A Verdonck
The 22q11.2 deletion syndrome (22q11.2DS) is one of the most frequent microdeletion syndromes and presents with a highly variable phenotype. In most affected individuals, specific but subtle facial features can be seen. In this observational study, we aim to investigate the craniofacial and dental features of 20 children with a confirmed diagnosis of 22q11.2DS by analyzing 3-dimensional (3D) facial surface scans, 2-dimensional (2D) clinical photographs, panoramic and cephalometric radiographs, and dental casts...
July 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28725252/individualized-3d-scanning-and-printing-for-non-melanoma-skin-cancer-brachytherapy-a-financial-study-for-its-integration-into-clinical-workflow
#20
Meritxell Arenas, Sebastià Sabater, Andreu Sintas, Monica Arguís, Víctor Hernández, Miguel Árquez, Iolanda López, Àngeles Rovirosa, Doménec Puig
PURPOSE: Skin cancer is the most common tumor in the population. There are different therapeutic modalities. Brachytherapy is one of the techniques used, in which it is necessary to build customized moulds for some patients. Currently, these moulds are made by hand using rudimentary techniques. We present a new procedure based on 3D printing and the analysis of the clinical workflow. MATERIAL AND METHODS: Moulds can be made either by hand or by automated 3D printing...
June 2017: Journal of Contemporary Brachytherapy
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