Surface Modification of High Density Ceramic Powder for Increasing Suspension Capacity in Three-Dimensional Printing Application

2018 ◽  
Vol 936 ◽  
pp. 159-163 ◽  
Author(s):  
Huang Jan Hsu ◽  
Shyh Yuan Lee ◽  
Shinn Liang Chang ◽  
Cho Pei Jiang

Three-dimensional slurry printing is a promising tool for making ceramic object but it limits in high dense ceramic powder because of poor suspension capacity. This study uses zirconia powder with an average diameter of 2 μm because its density is 5.67 g/cm3. A treatment protocol is proposed to improve the suspension capacity of zirconia powder including the ball milling, surface modification and resin blending. Experimental results show that adding 1% of isostearyl titanate, a coupling agent, for surface modification can enhance the lipophilicity of zirconia powder. Mixing surface modification powder in resin with a weight ratio of 7:3 and carrying on ball milling with 100 RPM for 6 hours can obtain the diameter of powder less than 400 nm. As a result, the zirconia slurry can obtain good suspension capacity which is over 48 hours.

2019 ◽  
Vol 798 ◽  
pp. 65-70
Author(s):  
Jintamai Suwanprateeb

Synthetic polymers are widely used in biomedical applications due to their advantages compared to other materials including low cost and ease of processability, good corrosion resistance and high properties to weight ratio. Among several polymeric biomaterials, polyethylene is a biocompatible polymer which has a long history of being utilized in many biomedical applications ranging from simple components to advanced implants. Although dense polyethylene is known to be a bioinert material which does not interact with host tissue, polyethylene in its appropriate porous form has been shown to be able to integrate well with surrounding host tissues and could widen its uses as bioactive implants. Porous polyethylene structure which was fabricated by three dimensional printing (3DP) is demonstrated. Its manufacturing technique, properties and clinical applications as tissue integrated implants which permitted soft or hard tissue ingrowth in tissue regeneration and replacement is discussed.


2016 ◽  
Vol 6 (1) ◽  
pp. 38-43 ◽  
Author(s):  
Michael Peppis Bartellas

Objectives: Three-dimensional (3D) printing has emerged in the past decade as a promising tool for the world of medicine. The focus of this article is to review how 3D printed models have been used in medical education.Methods: PubMed was the article database used, and the search criteria included the terms 3D printing and education. The exclusion criteria filtered out articles that were older than ten years, were not in English, and did not target a human population. There were 90 discovered articles, and 38 appropriate articles were determined after reviewing titles and abstracts.Results: Three main themes emerged from this review: general medical education, surgical education, and patient education. The more specific findings can be further divided into: using 3D printed models for teaching anatomy and simulation training; and preop­erative planning, intraoperative guidance, and postoperative evaluation.Conclusions: The general consensus was that 3D haptic modelling was a useful tool for educating trainees, staff physicians, and pa­tients. The models helped in increasing participants’ understanding of anatomy and pathologies, and improving trainee skill set and confidence. There is much support to continue research in this area and to further develop ways in which 3D printing can help improve medical education.  Objectifs : L’impression tridimensionnelle (3D) s’annonce comme un outil prometteur pour le monde de la médecine. Le présent ar­ticle révisera comment les méthodes d’impression 3D ont été utilisées dans l’éducation médicale.Méthodes : La base de données utilisée pour les articles fut PubMed et les critères de recherche ont inclus les termes impression 3D et éducation. Les critères d’exclusion ont omis des articles qui dataient de plus de dix ans, qui n’étaient pas en anglais, et qui n’avaient pas comme cible la population humaine. Il y a 90 articles qui furent trouvés en tout et 38 de ces articles ont été jugés adéquats pour la révision.Résultats : Trois grands thèmes ont été ressortis lors de cette révision : éducation médicale générale, éducation chirurgicale, et éduca­tion des patients. De façon plus précise, les thèmes spécifiques suivants furent dégagés : l’utilisation d’impression de modèles 3D pour l’enseignement de l’anatomie et la formation par simulation, la préparation préopératoire, le guide intraopératoire, et l’évaluation postopératoire.Conclusion : Les modèles haptiques 3D étaient reconnus comme un outil efficace pour éduquer les stagiaires, les médecins, et les patients. Ces modèles ont aidé à augmenter la compréhension de l’anatomie et de la pathologie des participants et ont augmenté la confiance et les habiletés des stagiaires. Ces preuves démontrent l’importance de continuer la recherche dans ce domaine afin de développer davantage de façons d’optimiser l’éducation médicale à l’aide de l’impression tridimensionnelle.


Author(s):  
D.W. Andrews ◽  
F.P. Ottensmeyer

Shadowing with heavy metals has been used for many years to enhance the topological features of biological macromolecular complexes. The three dimensional features present in directionaly shadowed specimens often simplifies interpretation of projection images provided by other techniques. One difficulty with the method is the relatively large amount of metal used to achieve sufficient contrast in bright field images. Thick shadow films are undesirable because they decrease resolution due to an increased tendency for microcrystalline aggregates to form, because decoration artefacts become more severe and increased cap thickness makes estimation of dimensions more uncertain.The large increase in contrast provided by the dark field mode of imaging allows the use of shadow replicas with a much lower average mass thickness. To form the images in Fig. 1, latex spheres of 0.087 μ average diameter were unidirectionally shadowed with platinum carbon (Pt-C) and a thin film of carbon was indirectly evaporated on the specimen as a support.


2009 ◽  
Vol 00 (00) ◽  
pp. 090730035508060-7
Author(s):  
Deng-Guang Yu ◽  
Chris Branford-White ◽  
Yi-Cheng Yang ◽  
Li-Min Zhu ◽  
Edward William Welbeck ◽  
...  

Author(s):  
Zhonghua Sun

Three-dimensional (3D) printing is increasingly used in medical applications with most of the studies focusing on its applications in medical education and training, pre-surgical planning and simulation, and doctor-patient communication. An emerging area of utilising 3D printed models lies in the development of cardiac computed tomography (CT) protocols for visualisation and detection of cardiovascular disease. Specifically, 3D printed heart and cardiovascular models have shown potential value in the evaluation of coronary plaques and coronary stents, aortic diseases and detection of pulmonary embolism. This review article provides an overview of the clinical value of 3D printed models in these areas with regard to the development of optimal CT scanning protocols for both diagnostic evaluation of cardiovascular disease and reduction of radiation dose. The expected outcomes are to encourage further research towards this direction.


2020 ◽  
Vol 13 (12) ◽  
pp. e239286
Author(s):  
Kumar Nilesh ◽  
Prashant Punde ◽  
Nitin Shivajirao Patil ◽  
Amol Gautam

Ossifying fibroma (OF) is a rare, benign, fibro-osseous lesion of the jawbone characterised by replacement of the normal bone with fibrous tissue. The fibrous tissue shows varying amount of calcified structures resembling bone and/or cementum. The central variant of OF is rare, and shows predilection for mandible among the jawbone. Although it is classified as fibro-osseous lesion, it clinically behaves as a benign tumour and can grow to large size, causing bony swelling and facial asymmetry. This paper reports a case of large central OF of mandible in a 40-year-old male patient. The lesion was treated by segmental resection of mandible. Reconstruction of the surgical defect was done using avascular fibula bone graft. Role of three-dimensional printing of jaw and its benefits in surgical planning and reconstruction are also highlighted.


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