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Energy Efficiency In Additive Manufacturing: Condensed Review, Ismail Fidan, Vivekanand Naikwadi, Suhas Alkunte, Roshan Mishra, Khalid Tantawi

Engineering Technology Faculty Publications

Today, it is significant that the use of additive manufacturing (AM) has growing in almost every aspect of the daily life. A high number of sectors are adapting and implementing this revolutionary production technology in their domain to increase production volumes, reduce the cost of production, fabricate light weight and complex parts in a short period of time, and respond to the manufacturing needs of customers. It is clear that the AM technologies consume energy to complete the production tasks of each part. Therefore, it is imperative to know the impact of energy efficiency in order to economically and properly …

Advancements And Challenges In Additively Manufactured Functionally Graded Materials: A Comprehensive Review, Suhas Alkunte, Ismail Fidan, Vivekanand Naikwadi, Shamil Gudavasov, Mohammad Alshaikh Ali, Mushfig Mahmudov, Seymur Hasanov, Muralimohan Cheepu

Engineering Technology Faculty Publications

This paper thoroughly examines the advancements and challenges in the field of additively manufactured Functionally Graded Materials (FGMs). It delves into conceptual approaches for FGM design, various manufacturing techniques, and the materials employed in their fabrication using additive manufacturing (AM) technologies. This paper explores the applications of FGMs in diverse fields, including structural engineering, automotive, biomedical engineering, soft robotics, electronics, 4D printing, and metamaterials. Critical issues and challenges associated with FGMs are meticulously analyzed, addressing concerns related to production and performance. Moreover, this paper forecasts future trends in FGM development, highlighting potential impacts on diverse industries. The concluding section summarizes …

Assessment Of The Effect Of Two Different Digital Fabrication Techniques On Marginal And Internal Fit Of Interim Fixed Dental Prothesis, Mohamed A. Shalaby, Mennatallah M. Wahba, Hisham I. Al-Ansari, Ahmed N. Mohamed

Future Dental Journal

Aim: The aim of that study was to evaluate the marginal and internal fit of a 3-unit, and 6-unit interim fixed dental prosthesis manufactured through milling and 3D printing technologies. Materials and Methods: Forty-eight interim fixed dental prostheses (FDP) were equally divided into two groups according to the fabrication technique. In group (MT), specimens were fabricated through milling technology while in group (PT), specimens were obtained by 3D printing. Each group was subdivided equally according to the FDP span length into 3-unit FDP (SFDP), and 6-unit FDP (LFDP). Marginal and internal fit were measured through the superimposition of the digital …

Infective Endocarditis-Related Pseudoaneurysms After Bentall Surgery: The Role Of 3d Printing In Pre-Surgical Planning And Management: Case Report, Abdalla Eltayeb, Shaid Khan, Irene Landi, Mohammed Aladmawi, Olga Vriz

Journal of the Saudi Heart Association

We present a case report of a male patient who underwent modified Bentall surgery with a mechanical valved conduit due to severe aortic regurgitation and ascending aortic aneurysm. Four years later, the patient developed a cascade of events as acute stoke, infective endocarditis due to Brucella abortus complicated by pseudoaneurysms of aortic graft with left ventricular outflow tract communication. A multi-modality approach, included a three-dimensional printing, facilitated the diagnosis and surgical planning. During surgery, the team opted for a salvage approach, and the patient showed continued improvement during follow-up. This case highlights the importance of careful monitoring and detection of …

An Update Of Additive Manufacturing (3d Printing) Technology In Dentistry., Rami Saleh Al Fodeh, Ahed Al-Wahadni, Baker Otman, Mahmoud Almasri

International Arab Journal of Dentistry

Background:

The development of procedures known as additive manufacturing, which aim to produce more complex items with a lower overall material consumption compared to processes known as subtractive manufacturing. In addition, in recent years there has been a significant rise in the quantity of dental materials that are produced via the use of these techniques. As a consequence of this, scientific research has been concentrating more and more on such technologies, particularly in order to shed light on the methodology, indicators, and boundaries of the emerging technology.

Methods:

The purpose of this paper is to provide a narrative assessment of …

Effect Of Two Designs Of Titanium Scaffold Fabricated By Selective Laser Melting On Compressive Modulus And Cell Attachment, Shimaa A. El Saeed, Inas T. Motawea, Rania E. Bayoumi, Mohammad M. Farag

Al-Azhar Journal of Dentistry

Purpose: This study was conducted to investigate the influence of cubic and diamond unit cell types, with 80% porosity on mechanical behavior of titanium alloy (Ti6Al4V) scaffolds and cell attachment. Material and Methods: The titanium scaffold was fabricated by Selective Laser Melting (SLM), and then surface modification was done by biomimetic coating. Morphological characterization of the samples was performed through SEM, EDX and XRD system before and after modification. The samples were cultured for cell attachment and then subjected to compressive loading to assess the mechanical properties of the scaffolds. Results: The morphological results demonstrated that the geometric dimensions of …

Synthesis And Characterization Of Photocurable Resin Used In 3d Printing For Dental Applications, Mayar E. Mohamed, Inas T. Motawea, Hisham Essawy

Al-Azhar Journal of Dentistry

Purpose: The present study aimed to synthesize and characterize photocurable resin with lower cost to be used in DLP 3D printing to fabricate clear dental appliances like surgical guides and aligners. Materials and Methods: Mixture of acrylates of 1,10 decandiol diacrylate, pentaerythritol tetracrylate and isobornyl acrylare were mixed together and dissolve the photo initiator phenyl bis (2,4,6 trimethylbenzoyl) phosphine oxide and optical absorber 2,5-bis (tert-butyl-benzoxzzol-2-yl) thiophene by proper mixing for 30 mins at room temperature. Then experimental resin specimens were fabricated by DLP 3D printer 12 specimens were subjected to post curing for 15 mins and another 12 specimens were …

Strategies Dental Center Leaders Use To Improve Productivity Using Onsite 3d Printing, Edward Zamanian

Walden Dissertations and Doctoral Studies

Many dental centers are leveraging onsite 3D printing to increase their productivity and improve the quality of care they provide. However, dental center leaders lacking strategies to implement onsite 3D printing in their dental centers fail to take advantage of the substantial benefits of using this new technology. Grounded in the theory of disruptive innovation, the purpose of this qualitative multiple-case study was to explore strategies dental center leaders use to improve productivity using onsite 3D printing. The participants comprised five dental center leaders in the United States who successfully implemented strategies to improve productivity using onsite 3D printing. Data …

Experimental Tests And Numerical Study Of Trajectories Of Different Types Of Dropped Objects, Yi Li

University of New Orleans Theses and Dissertations

In marine and offshore engineering, dropped objects, such as drill pipes, anchor chains, containers and some small parts, can accidentally fall into the water from ships or offshore platforms, causing casualties on deck or damage to underwater equipment. Damaged equipment can further harm the environment, such as oil spills from damaged wellheads. Therefore, for safe engineering and environmental protection reasons, we need to develop methods and tools that can predict the trajectory of dropped objects.

In this dissertation, we first study containers dropped from ships. More and more containers are falling into the sea due to bad weather. Containers lost …

Nondestructive Evaluation Of 3d Printed, Extruded, And Natural Polymer Structures Using Terahertz Spectroscopy And Imaging, Alexander T. Clark

Dissertations

Terahertz (THz) spectroscopy and imaging are considered for the nondestructive evaluation (NDE) of various three-dimensional (3D) printed, extruded, and natural polymer structures. THz radiation is the prime candidate for many NDE challenges due to the added benefits of safety, increased contrast and depth resolution, and optical characteristic visualization when compared to other techniques. THz imaging, using a wide bandwidth pulse-based system, can evaluate the external and internal structure of most nonconductive and nonpolar materials without any permanent effects. NDE images can be created based on THz pulse attributes or a material’s spectroscopic characteristics such as refractive index, attenuation coefficient, or …

Short-Term Program On Three-Dimensional Printed Self-Help Devices For Occupational Therapy Students: A Pre-Post Intervention Study, Yusuke Harada, Yuki Sawada, Jun Suzurikawa, Rie Takeshima, Tomoko Kondo

Journal of Occupational Therapy Education

Despite the increasing importance of digital fabrication, of which three-dimensional printing is an important aspect, educational programs in this area have not been fully developed. To utilize three-dimensional printing optimally, occupational therapists need to be familiar with this new technology, understand its scope of application, and possess certain levels of skills for producing. The purpose of this study was to examine the effectiveness of a short-term program for occupational therapy students to increase the acceptance of three-dimensional printed devices by acquiring the basic knowledge and skills of making three-dimensional printed self-help devices. The research involved an intervention study with a …

3d Printing Starporeⓡ For Bone Tissue Engineering, Jeremy Nicolas Dinoro

University of Wollongong Thesis Collection 2017+

Since the advent of Tissue Engineering (TE) in the late 1980’s, significant progress has been made within the biomedical landscape. A recently established branch within TE is biofabrication, a field that aims to automate the fabrication of biologically functional materials through the use of additive manufacturing or three-dimensional (3D) printing, among other techniques. Additive manufacturing offers fine control over part porosity, with the capacity to match the complex internal architecture of human bone. Coupled with clinical 3D scanning techniques, 3D printing has the capacity to generate implants that accurately match defected areas. However, due to the limited number of regulatory …

The Effect Of Crowding On The Accuracy Of 3d Printed Aligners, Tonya Spangler

Theses and Dissertations

Purpose: To evaluate the accuracy of three-dimensionally (3D) printed aligners compared to conventional vacuum-formed thermoplastic aligners with varying levels of dental crowding.

Methods: Digital intraoral scans of 10 different cases were assigned to their respective groups (n=10, each, 30 total) as follows: no crowding (control), moderate crowding, and severe crowding. Using 3Shape software, digital aligner samples were created in standard tessellation language (STL) file format and randomly 3D printed. The same STL files of each case were also sent to a dental laboratory for the fabrication of vacuum-formed samples, which is the current technology used for manufacturing aligners. The intaglio …

Comparative Analysis Of 3d Printed Denture Resins With Traditional Denture Materials At The Micro Level, Aneeza Hussain, Caleb Beckwith, Gaffar Gailani

Publications and Research

The aim of this experiment was to evaluate and identify compression strength between traditionally manufactured acrylic dentures and additive manufacturing resin dentures. Specifically, the dentures produced by Uhler Dental, its Reveal line were compared against samples produced on the Formlabs Form 2 SLA, Stereolithography, 3D printer using their Denture Teeth A2 resin to test compression strength to assure they are compatible with the occlusal forces in the oral cavity. Using the ZwickRoell tensile testing machine, it appeared that the acrylic dentures were half as strong as the resin dentures. Then we went ahead to and did a comparative analysis under …

Retention Of Rapid Prototyped Complete Dentures Using Two Different Types Liquid Resin, Lina Khalaf Ismail, Mohammed Farouk Abdullah, Mohammed Mahmoud Dohiem

Future Dental Journal

Objectives: Comparing the retention of upper complete denture manufactured using two different denture base materials, both of them were manufactured using rapid prototyping method.

Methods: Nineteen patients were selected. For both groups, the dentures were manufactured using Rapid prototyping method following the next steps, a preliminary impression was made & trial denture bases were constructed on the primary casts for the upper & lower arches for a jaw relation record. A facebow record was used to mount the upper cast, while the lower cast was mounted using a centric relation record. Setting of artificial teeth was performed, then the denture …

The Influence Of Cbct-Derived 3d-Printed Models On Endodontic Microsurgical Treatment Planning And Confidence Of The Operator, Shreyas Oza, Johnah C. Galicia

Orthodontics and Endodontics Theses

Aims Use of 3D printed models in Endodontics has been gaining popularity since the technology to create them became more affordable. Currently, there are no studies that evaluate the influence of 3D models on endodontic surgical treatment planning and on operator confidence. Therefore, aims of this study were to: (i) Determine whether the availability of a 3D printed analogue can influence treatment-planning and operator confidence; and, (ii) Assess which factors of operator confidence are influenced, if any.

Materials and Methods Endodontists were asked to analyze a pre-selected CBCT scan of an endodontic surgical case and to answer a questionnaire that …

J Mich Dent Assoc August 2021

The Journal of the Michigan Dental Association

Every month, The Journal of the Michigan Dental Association brings news, information, and features about Michigan dentistry to our state's oral health community and the MDA's 6,200+ members. No publication reaches more Michigan dentists!

In this issue, the reader will find the following original content:

• A cover story on “Diversity, Equity, Inclusion, and Dentistry: Understanding the MDA’s Perspective”.
• A feature article, “Diversity, Equity, Inclusion, and Dentistry: Its Impact on Oral Health — You Can Make a Difference!”.
• A feature article from the Journal’s DEI series, “Welcoming Diversity, Equity, and Inclusion with Students Considering Careers in Dentistry”.
• A feature clinical article …

3d Printing Of High Viscosity Fluids And Its Application In 3d Printing Of Prosthetic Teeth., Abhilash Aditya

Open Access Theses & Dissertations

The advancement in technology has brought forward non-conventional manufacturing methods that are efficient and advantageous for specific applications. 3D printing is one such outcome, whose applications stretch from biomedical applications to daily products. 3D printing is a rapidly growing technology, and innovative research developments have proven versatility in creating physical objects. Simplification and constant improvement in Fused Deposition Modeling (FDM) operation result from decades of research. However, 3D printing is material-specific and contributes to shortcomings in the technology. The build-material dictates the extrusion parameters, including the material discharge rate and head speed for a continuous flow. Customization being the prime …

J Mich Dent Assoc May 2021

The Journal of the Michigan Dental Association

Every month, The Journal of the Michigan Dental Association brings news, information, and features about Michigan dentistry to our state's oral health community and the MDA's 6,200+ members. No publication reaches more Michigan dentists!

In this issue, the reader will find the following original content:

• A cover story “3D Printing in Dentistry: Concepts, Technologies, and Applications”.
• An interview with new MDA President Dr. Mike Maihofer.
• The MDA award-winners for 2021.
• A feature article, “Things to Know about the New e-Prescribing Law”.
• News you need, Editorial and regular department articles on MDA Foundation activities, Dentistry and the Law, Staff Matters, and …

Fabrication Of Chemically-Functionalized 3dprinted Porous Scaffolds For Biomedical Applications, Eiman Hamed Matar Atalla Alblooshi

Theses

Hard tissues, such as bone and teeth, are natural composites of collagen nanofibers that are reinforced by inorganic calcium phosphate Nano crystallites, in the form of nanocomposites. The interlocking between these components in hard tissues explains their unique characteristics. Bone is mainly classified into two major types; compact and cancellous depending on the extent of porosity. Fractures in the compact bone can be treated using bone fixation implants, such as rods, screws, and plates, or can be totally replaced by bone implants if complete substitution is required. Cancellous bone, on the other hand, is highly porous and its substitution with …

Impact Of Grain Orientation And Phase On Volta Potential Differences In An Additively Manufactured Titanium Alloy, Jake T. Benzing, Olivia O. Maryon, Nik Hrabe, Paul H. Davis, Michael F. Hurley, Frank W. Delrio

Materials Science and Engineering Faculty Publications and Presentations

This work introduces a method for co-localized multi-modal imaging of sub-μm features in an additively manufactured (AM) titanium alloy. Ti-6Al-4V parts manufactured by electron beam melting powder bed fusion were subjected to hot isostatic pressing to seal internal porosity and machined to remove contour–hatch interfaces. Electron microscopy and atomic force microscopy-based techniques (electron backscatter diffraction and scanning Kelvin probe force microscopy) were used to measure and categorize the effects of crystallographic texture, misorientation, and phase content on the relative differences in the Volta potential of α-Ti and β-Ti phases. Given the tunability of additive manufacturing processes, …

Advances In Metal Additive Manufacturing: A Review Of Common Processes, Industrial Applications, And Current Challenges, Ana Vafadar, Ferdinando Guzzomi, Alexander Rassau, Kevin Hayward

Research outputs 2014 to 2021

© 2021 by the authors. Licensee MDPI, Basel, Switzerland. In recent years, Additive Manufacturing (AM), also called 3D printing, has been expanding into several industrial sectors due to the technology providing opportunities in terms of improved functionality, productivity, and competitiveness. While metal AM technologies have almost unlimited potential, and the range of applications has increased in recent years, industries have faced challenges in the adoption of these technologies and coping with a turbulent market. Despite the extensive work that has been completed on the properties of metal AM materials, there is still a need of a robust understanding of processes, …

Rapid Prototyping Of Surgical Staples, Osama Al Takhayneh

University of Wollongong Thesis Collection 2017+

There is a current need for the development of new bone implant materials to overcome a variety of surgical, biological, and manufacturing drawbacks. There are several techniques used in the manufacturing of bone implants such as 3D printing. Rapid prototyping/3D printing is an important process in the development of implants used in bone fixation surgeries, its importance lies within the ability to customize and create patient specific systems to increase the efficiency of bone fixation surgeries. The main aim of this study is to develop and test new materials for the purpose of internal fixation implants, such as bone staples, …

Design And Printing Of A Low-Cost 3d-Printed Nasal Osteotomy Training Model: Development And Feasibility Study., Michelle Ho, Jared Goldfarb, Roxana Moayer, Uche Nwagu, Rohan Ganti, Howard Krein, Ryan Heffelfinger, Morgan Leigh Hutchinson

Department of Otolaryngology - Head and Neck Surgery Faculty Papers

BACKGROUND: Nasal osteotomy is a commonly performed procedure during rhinoplasty for both functional and cosmetic reasons. Teaching and learning this procedure proves difficult due to the reliance on nuanced tactile feedback. For surgical simulation, trainees are traditionally limited to cadaveric bones, which can be costly and difficult to obtain.

OBJECTIVE: This study aimed to design and print a low-cost midface model for nasal osteotomy simulation.

METHODS: A 3D reconstruction of the midface was modified using the free open-source design software Meshmixer (Autodesk Inc). The pyriform aperture was smoothed, and support rods were added to hold the fragments generated from the …

Additively Manufactured Parametric Universal Clip-System: An Open Source Approach For Aiding Personal Exposure Easurement In The Breathing Zone, Kirsi Kukko, Jan Sher Akmal, Anneli Kangas, Mika Salmi, Roy Björkstrand, Anna-Kaisa Viitanen, Jouni Partanen, Joshua M. Pearce

Michigan Tech Publications

Design for additive manufacturing is adopted to help solve problems inherent to attaching active personal sampler systems to workers for monitoring their breathing zone. A novel and parametric 3D printable clip system was designed with an open source Computer-aided design (CAD) system and was additively manufactured. The concept was first tested with a simple clip design, and when it was found to be functional, the ability of the innovative and open source design to be extended to other applications was demonstrated by designing another tooling system. The clip system was tested for mechanical stress test to establish a minimum lifetime …

A Clinically Representative Rat Model Of Hip Hemiarthroplasty, Adam Dm Paish

Electronic Thesis and Dissertation Repository

Joint replacement is an increasingly common surgery with over 130,000 procedures performed annually in Canada. Although joint replacement surgery is highly successful, implants do not last a lifetime, and often have to be replaced via costly revision surgeries. Before innovations aimed at extending the life of implants are applied to the clinic, testing must be performed in animal models. Clinically representative small-animal models of joint replacement would be ideal in the initial stages of research and development, due to ease of handling and low costs, but few such models have been established in the literature. Thus, we describe the development …

Possible Self Dynamics Of Community College Students Engaged In 3d Printing In Informal Environments, Lawrence Ralph Nightingale Jr.

Educational Leadership & Workforce Development Theses & Dissertations

The overall number of students from diverse backgrounds and women that graduate from community college with degrees in high paying Science Technology Engineering and Mathematics (STEM) disciplines is unacceptably low. The number of opportunities to gain exposure to STEM-based expressions of technology to overcome the dearth of exposure in high school is limited in community college. 3D Printing uses computer-controlled machines to build physical objects one layer at a time starting from the bottom up. The computer-controlled nature of 3D Printing provides a low risk, low cost platform to exercise elements of computer programming and engineering.

This study was a …

A Comparison Efficacy Study Of Commercial Nasopharyngeal Swabs Versus A Novel 3d Printed Swab For The Detection Of Sars-Cov-2, Forest W. Arnold, Gerald Grant, Phillip F. Bressoud, Stephen P. Furmanek, Donghoon Chung, Nadine Sbaih, Dipan Karmali, Meredith Cahill, George Pantalos

The University of Louisville Journal of Respiratory Infections

Introduction: The large volume of diagnostic tests required by the response to the COVID-19 pandemic resulted in a shortage of commercial nasopharyngeal swabs. In an effort to alleviate the shortage, swabs created by 3D printing may be a solution.

Methods: We designed and produced 3D printed swabs and sought to compare their ability to detect SARS-CoV-2 in patients admitted for COVID-19 or who were suspected of having COVID-19.

Results: A total of 30 patients were swabbed with a commercial and a 3D printed swab. Results matched in 27 of 30 patients (90%). Two patients were discordant with a positive commercial …

Metal Additive Manufacturing For Fixed Dental Prostheses, Mai El Najjar

Electronic Thesis and Dissertation Repository

The use of additive manufacturing (AM) in dentistry has gained momentum in recent years. However, high initial costs and uncertainty surrounding the quality of AM products are considered barriers to their use. This research compared dental substructures fabricated by AM versus conventional casting and milling.

Cobalt-chromium alloy rectangular bars and three-unit bridge substructures were fabricated by AM, casting or milling. Bars manufactured by AM exhibited superior flexural strength, shear bond strength of porcelain coating, and Vickers hardness. Bridge substructures fabricated by AM showed similar flexural stiffness to cast, similar flexural loads at failure to milled and cast, and overall accuracy …

The Effects Of Bioinspired Infill Designs And Density On The Compressive Strength Of Parts Produced By Additive Manufacturing Via Fused Deposition Modeling, Joseph D. Long

Electronic Theses and Dissertations

The current state of additive manufacturing (AM) is still primarily used for prototyping and modeling. However, with the increase in available materials and more advanced machines, AM is beginning to become a production process in which ready-to-ship products are being manufactured. This makes it all the more important to effectively and efficiently use the material in AM machines. One of the ways that material usage can be improved upon is more efficiently structuring the infill material that is used. This dissertation reports on the testing and statistical analysis of the compressive modulus of elasticity, the compressive proportional limit, and the …