Digital Commons Network^™

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 …

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 …

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 …

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 …

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 …

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 …

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 …

Left Atrial Appendage Printing Process, Areli Reyes, Brandon James Mukai, Mia Noelle Von Knorring

Biomedical Engineering

The left atrial appendage senior design team aims to assist in closing off the left atrial appendage that is susceptible to coagulation due to non-valvular atrial fibrillation. Coagulation in the left atrial appendage (LAA) can be life threatening as it can lead to a stroke. Dr. Chris Porterfield performs a procedure that uses the Boston Scientific Watchman to close the appendage. He finds that sizing the Watchman properly is difficult with limited visuals from live CT scans. He proposed converting the CT scans into a 3D printed model of the left atrial appendage and left atrium so he can visually …

A Comparison Of Three-Dimensional Printing Technologies On The Precision, Trueness, And Accuracy Of Printed Retainers, Owais A. Naeem

Theses and Dissertations

Purpose: The aim of this study was to evaluate the differences in the precision, trueness, and accuracy of 3D printed orthodontic clear retainers produced using printer systems with various printing technologies.

Methods: Retainers (n=15) were printed using four different 3D printers: a stereolithography (SLA) printer, two different digital light processing (DLP and cDLP) printers, and a polyjet photopolymer (PPP) printer. The 3D printed retainers were transformed into a digital file through a cone-beam computed tomography scan that was compared to the original image using a 3D superimposition analysis software. At previously chosen landmarks (R6, L6, R3, L3, R1, L1) retainers …

Design Of A New 3d‐Printed Joint Plug, Lobat Tayebi, Zhanfeng Cui, Hua Ye

School of Dentistry Faculty Research and Publications

This paper introduces a kit of parts as a novel three‐dimensional (3D)–printed joint plug, in which each of the parts function cooperatively to treat cartilage damage in joints of the human body (e.g., hips, wrists, elbow, knee, and ankle). Three required and one optional parts are involved in this plug. The first part is a 3D‐printed hard scaffold (bone portion) to accommodate bone cells, and the second is a 3D‐printed soft scaffold (cartilage portion) overlying the bone portion to accommodate chondrocytes. The third part of joint plug is a permeable membrane, termed film, to cover the entire plug to provide …

Enhancing Cell Seeding And Osteogenesis Of Mscs On 3d Printed Scaffolds Through Injectable Bmp2 Immobilized Ecm-Mimetic Gel, Farahnaz Fahimipour, Erfan Dashtimoghadam, Mohammad Mahdi Hasani-Sadrabadi, Jessica Vargas, Daryoosh Vashaee, Doug Lobner, Tahereh S. Jafarzadeh Kashi, Behnam Ghasemzadeh, Lobat Tayebi

Biomedical Sciences Faculty Research and Publications

Objective

Design of bioactive scaffolds with osteogenic capacity is a central challenge in cell-based patient-specific bone tissue engineering. Efficient and spatially uniform seeding of (stem) cells onto such constructs is vital to attain functional tissues. Herein we developed heparin functionalized collagen gels supported by 3D printed bioceramic scaffolds, as bone extracellular matrix (ECM)-mimetic matrices. These matrices were designed to enhance cell seeding efficiency of mesenchymal stem cells (MSCs) as well as improve their osteogenic differentiation through immobilized bone morphogenic protein 2 (BMP2) to be used for personalized bone regeneration.

Methods

A 3D gel based on heparin-conjugated collagen matrix capable of …

Physical And Optical Properties Of Provisional Crown And Bridge Materials Fabricated Using Cad/Cam Milling Or 3d Printing Technology, Niranjan Joshi

Student Theses, Dissertations and Capstones

Objective: This study compared the physical and optical properties of provisional crown and bridge materials fabricated using CAD/CAM or 3D printing technology. Aim: To compare the biaxial flexural strength, microhardness, translucency parameter and gloss of provisional resin discs fabricated by milling PMMA blocks, versus two different resins printed using 3D printers. Hypothesis: There is no difference in the flexural strength, hardness, translucency and gloss of provisional resins fabricated by different digital technologies. Materials and methods: 90-disc shaped specimens for provisional resins were fabricated using a common digital file. These samples were equally distributed in three groups of 30 each. Group …

Assistive Utensil: A Spork For Hand Tremors And Spatial Awareness, Ana Font Hernandez, Jacob Kabariti, Troy Taylor

Publications and Research

In this poster, we present a 3D printed solution for hand tremors and special awareness. Our spork is an assistive device designed and 3D printed for patients suffering from scleroderma, systemic sclerosis, Parkinson's, multiple sclerosis, drug withdrawal, etc. The scale-based handle will act as a counterweight to offset the contents on the other end and reduce shakiness. The larger grip allows an easy and comfortable hold. The product will be 3D printed for a customizable fit and at an affordable price. Lastly, the product will include a haptic feedback sensor to assist the visually impaired in locating food contents on …

Additive Manufacturing Techniques And Their Biomedical Applications, Yujing Liu, Wei Wang, Laichang Zhang

Research outputs 2014 to 2021

Additive manufacturing (AM), also known as three-dimensional (3D) printing, is gaining increasing attention in medical fields, especially in dental and implant areas. Because AM technologies have many advantages in comparison with traditional technologies, such as the ability to manufacture patient-specific complex components, high material utilization, support of tissue growth, and a unique customized service for individual patients, AM is considered to have a large potential market in medical fields. This brief review presents the recent progress of 3D-printed ­biomedical materials for bone applications, mainly for metallic materials, including multifunctional alloys with high strength and low Young’s modulus, shape memory alloys, …

3d Printed Tcp-Based Scaffold Incorporating Vegf-Loaded Plga Microspheres For Craniofacial Tissue Engineering, Farahnaz Fahimipour, Morteza Rasoulianboroujeni, Erfan Dashtimoghadam, Kimia Khoshroo, Mohammadreza Tahriri, Doug Lobner, Lobat Tayebi

School of Dentistry Faculty Research and Publications

Objective

Vascularization is a critical process during bone regeneration/repair and the lack of tissue vascularization is recognized as a major challenge in applying bone tissue engineeringmethods for cranial and maxillofacial surgeries. The aim of our study is to fabricate a vascular endothelial growth factor (VEGF)-loaded gelatin/alginate/β-TCP composite scaffold by 3D printing method using a computer-assisted design (CAD) model.

Methods

The paste, composed of (VEGF-loaded PLGA)-containing gelatin/alginate/β-TCP in water, was loaded into standard Nordson cartridges and promptly employed for printing the scaffolds. Rheological characterization of various gelatin/alginate/β-TCP formulations led to an optimized paste as a printable bioink at room …

Testing A Novel 3d Printed Radiographic Imaging Device For Use In Forensic Odontology, Tara L. Newcomb, Ann M. Bruhn, Bridget Giles, Hector M. Garcia, M. Arch, Norou Diawara

Dental Hygiene Faculty Publications

There are specific challenges related to forensic dental radiology and difficulties in aligning X-ray equipment to teeth of interest. Researchers used 3D printing to create a new device, the combined holding and aiming device (CHAD), to address the positioning limitations of current dental X-ray devices. Participants (N = 24) used the CHAD, soft dental wax, and a modified external aiming device (MEAD) to determine device preference, radiographer's efficiency, and technique errors. Each participant exposed six X-rays per device for a total of 432 X-rays scored. A significant difference was found at the 0.05 level between the three devices ( …

A Multi-Channel 3d-Printed Bioreactor For Evaluation Of Growth And Production In The Microalga Dunaliella Sp, Cristian A. Cox

Electronic Theses and Dissertations

We explored the capabilities of additive manufacturing using a photo-cured jetted material 3D printer to manufacture a milli-microfluidic device with direct application in microalgae Dunaliella sp growth and intracellular compounds biosynthesis tests. A continuous microbioreactor for microalgae culture was CAD designed and successfully built in 1 hour and 49 minutes using black photopolymer cured by UV and a support material. The microreactor was made up of 2 parts including the bioreactor itself and a microchannel network for culture media fluids and microalgae. Both parts were assembled to form a single unit. Additional optical and auxiliar components were added. An external …

Exploration Of Materials Used In 3-Dimensional Printing For The Dental Industry, Holly Chang Hayden

Scripps Senior Theses

A limiting factor in the digitization of dental devices is the availability of materials suitable for use in both dentistry and the new digital technologies. As a rapidly growing industry, three-dimensional printing (3DP) has the potential to disrupt traditional manufacturing and prototyping methods. A review of both restorative materials and the current 3DP materials has lead to a focus on fiber- reinforced composites in the exploration for a new 3DP material. In addition, another area worth exploring and investing in would be 3D bioprinting as it opens up the possibility of regenerative dentistry.