scholarly journals Three-dimensional printing spiders: back-and-forth glue application yields silk anchorages with high pull-off resistance under varying loading situations

2017 ◽  
Vol 14 (127) ◽  
pp. 20160783 ◽  
Author(s):  
Jonas O. Wolff ◽  
Marie E. Herberstein
Keyword(s):  
Three Dimensional ◽  
Insertion Point ◽  
Additional Material ◽  
Three Dimensional Printing ◽  
Broad Bandwidth ◽  
Starting Point ◽  
Rapid Production ◽  
Orb Web ◽  
Orb Web Spiders ◽  
Dimensional Printing

The anchorage of structures is a crucial element of construction, both for humans and animals. Spiders use adhesive plaques to attach silk threads to substrates. Both biological and artificial adhesive structures usually have an optimal loading angle, and are prone to varying loading situations. Silk anchorages, however, must cope with loading in highly variable directions. Here we show that the detachment forces of thread anchorages of orb-web spiders are highly robust against pulling in different directions. This is gained by a two-step back-and-forth spinning pattern during the rapid production of the adhesive plaque, which shifts the thread insertion point towards the plaque centre and forms a flexible tree root-like network of branching fibres around the loading point. Using a morphometric approach and a tape-and-thread model we show that neither area, nor width of the plaque, but the shift of the loading point towards the plaque centre has the highest effect on pull-off resistance. This is explained by a circular propagation of the delamination crack with a low peeling angle. We further show that silken attachment discs are highly directional and adjusted to provide maximal performance in the upstream dragline. These results show that the way the glue is applied, crucially enhances the toughness of the anchorage without the need of additional material intake. This work is a starting point to study the evolution of tough and universal thread anchorages among spiders, and to develop bioinspired ‘instant’ anchorages of thread- and cable-like structures to a broad bandwidth of substrates.

scholarly journals An Overview of Recent Trends in Additive Manufacturing with Polymer Powders, Production, Applications and Developments

2021 ◽  
Vol 33 (4) ◽  
pp. 701-711
Author(s):  
HARRY CHIRIRIWA
Keyword(s):  
Additive Manufacturing ◽  
Three Dimensional ◽  
Industrial Applications ◽  
Three Dimensional Printing ◽  
Starting Point ◽  
Future Challenges ◽  
Recent Trends ◽  
Manufacturing Applications ◽  
Dimensional Printing ◽  
Polymer Powders

In this article, an overview of three dimensional printing, also known as additive manufacturing (AM), with a focus on polymers is presented. As a starting point the additive manufacturing concept is described. Several well established technologies, including their advantages and drawbacks and a list of polymers, which are commonly used in commercial printers are evaluated and outlined. The additive manufacturing applications together with the key developments are also presented. The article further highlights major industrial applications, directions for promising research are identified, possible full exploitation potential of additive manufacturing in industries and finally outlines future challenges in this rapidly growing industries.

A novel fast disintegrating tablet fabricated by three‐dimensional printing

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

Central ossifying fibroma of mandible

2020 ◽  
Vol 13 (12) ◽  
pp. e239286
Author(s):  
Kumar Nilesh ◽  
Prashant Punde ◽  
Nitin Shivajirao Patil ◽  
Amol Gautam
Keyword(s):  
Fibrous Tissue ◽  
Three Dimensional ◽  
Facial Asymmetry ◽  
Ossifying Fibroma ◽  
Mandible Reconstruction ◽  
Three Dimensional Printing ◽  
Osseous Lesion ◽  
Large Size ◽  
Dimensional Printing

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.

scholarly journals Three-Dimensional Printing in Orthopedics: from the Basics to Surgical Applications

2021 ◽  
Author(s):  
Leandro Ejnisman ◽  
Bruno Gobbato ◽  
Andre Ferrari de França Camargo ◽  
Eduardo Zancul
Keyword(s):  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Dimensional Printing

Three-Dimensional Printing Using a Maize Protein: Zein-Based Inks in Biomedical Applications

2021 ◽  
Author(s):  
Jorge Alfonso Tavares-Negrete ◽  
Alberto Emanuel Aceves-Colin ◽  
Delia Cristal Rivera-Flores ◽  
Gladys Guadalupe Díaz-Armas ◽  
Anne-Sophie Mertgen ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Maize Protein ◽  
Dimensional Printing

Applications of 3D printing in critical care medicine: A scoping review

2021 ◽  
pp. 0310057X2097665
Author(s):  
Natasha Abeysekera ◽  
Kirsty A Whitmore ◽  
Ashvini Abeysekera ◽  
George Pang ◽  
Kevin B Laupland
Keyword(s):  
Critical Care ◽  
Scoping Review ◽  
A Priori ◽  
Three Dimensional ◽  
Critical Care Medicine ◽  
Future Research ◽  
Care Practice ◽  
Three Dimensional Printing ◽  
Wide Range ◽  
Dimensional Printing

Although a wide range of medical applications for three-dimensional printing technology have been recognised, little has been described about its utility in critical care medicine. The aim of this review was to identify three-dimensional printing applications related to critical care practice. A scoping review of the literature was conducted via a systematic search of three databases. A priori specified themes included airway management, procedural support, and simulation and medical education. The search identified 1544 articles, of which 65 were included. Ranging across many applications, most were published since 2016 in non – critical care discipline-specific journals. Most studies related to the application of three-dimensional printed models of simulation and reported good fidelity; however, several studies reported that the models poorly represented human tissue characteristics. Randomised controlled trials found some models were equivalent to commercial airway-related skills trainers. Several studies relating to the use of three-dimensional printing model simulations for spinal and neuraxial procedures reported a high degree of realism, including ultrasonography applications three-dimensional printing technologies. This scoping review identified several novel applications for three-dimensional printing in critical care medicine. Three-dimensional printing technologies have been under-utilised in critical care and provide opportunities for future research.

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