scholarly journals Improving the trajectory of transpedicular transdiscal lumbar screw fixation with a computer-assisted 3D-printed custom drill guide

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3564 ◽  
Author(s):  
Zhen-Xuan Shao ◽  
Jian-Shun Wang ◽  
Zhong-Ke Lin ◽  
Wen-Fei Ni ◽  
Xiang-Yang Wang ◽  
...  
Keyword(s):  
Screw Fixation ◽  
Three Dimensional ◽  
Computer Assisted ◽  
Significant Statistical Difference ◽  
Drill Guide ◽  
Hospital Patients ◽  
Normal Spine ◽  
3D Printed ◽  
Design Software ◽  
Spine Fixation

Transpedicular transdiscal screw fixation is an alternative technique used in lumbar spine fixation; however, it requires an accurate screw trajectory. The aim of this study is to design a novel 3D-printed custom drill guide and investigate its accuracy to guide the trajectory of transpedicular transdiscal (TPTD) lumbar screw fixation. Dicom images of thirty lumbar functional segment units (FSU, two segments) of L1–L4 were acquired from the PACS system in our hospital (patients who underwent a CT scan for other abdomen diseases and had normal spine anatomy) and imported into reverse design software for three-dimensional reconstructions. Images were used to print the 3D lumbar models and were imported into CAD software to design an optimal TPTD screw trajectory and a matched custom drill guide. After both the 3D printed FSU models and 3D-printed custom drill guide were prepared, the TPTD screws will be guided with a 3D-printed custom drill guide and introduced into the 3D printed FSU models. No significant statistical difference in screw trajectory angles was observed between the digital model and the 3D-printed model (P > 0.05). Our present study found that, with the help of CAD software, it is feasible to design a TPTD screw custom drill guide that could guide the accurate TPTD screw trajectory on 3D-printed lumbar models.

scholarly journals Tissue Engineering and Three-Dimensional Printing in Periodontal Regeneration: A Literature Review

2020 ◽  
Vol 9 (12) ◽  
pp. 4008
Author(s):  
Simon Raveau ◽  
Fabienne Jordana
Keyword(s):  
Selective Laser Sintering ◽  
Periodontal Regeneration ◽  
Three Dimensional ◽  
Computer Assisted ◽  
Natural Polymers ◽  
Three Dimensional Printing ◽  
Computer Assisted Design ◽  
New Ideas ◽  
3D Printed ◽  
Dimensional Printing

The three-dimensional printing of scaffolds is an interesting alternative to the traditional techniques of periodontal regeneration. This technique uses computer assisted design and manufacturing after CT scan. After 3D modelling, individualized scaffolds are printed by extrusion, selective laser sintering, stereolithography, or powder bed inkjet printing. These scaffolds can be made of one or several materials such as natural polymers, synthetic polymers, or bioceramics. They can be monophasic or multiphasic and tend to recreate the architectural structure of the periodontal tissue. In order to enhance the bioactivity and have a higher regeneration, the scaffolds can be embedded with stem cells and/or growth factors. This new technique could enhance a complete periodontal regeneration. This review summarizes the application of 3D printed scaffolds in periodontal regeneration. The process, the materials and designs, the key advantages and prospects of 3D bioprinting are highlighted, providing new ideas for tissue regeneration.

scholarly journals Initial assessment of treatment of talar posterior process fractures with open reduction and percutaneous fixation

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Haijiao Mao ◽  
Haiqing Wang ◽  
Jiyuan Zhao ◽  
Linger Wang ◽  
Liwei Yao ◽  
...  
Keyword(s):  
Open Reduction ◽  
Screw Fixation ◽  
Three Dimensional ◽  
Operation Time ◽  
Initial Assessment ◽  
Computer Assisted ◽  
Percutaneous Screw Fixation ◽  
Posterior Process ◽  
Significant Difference ◽  
Vas Scores

AbstractThe purpose of this study was to provide an initial assessment of treatment for talar posterior process fractures using open reduction and internal fixation (ORIF) through posteromedial approach and percutaneous screw fixation. From January 2014 to December 2018, 12 cases with displaced fracture of talar posterior process were treated in our department. The clinical and radiological results were assessed after 4 and 12 months of operation with Visual Analog Scale (VAS) pain and American Orthopedic Foot and Ankle Society (AOFAS) scores. ORIF was performed in four of the cases and percutaneous screw fixation was performed in eight of the cases. The average follow-up period was 13 months. Complications such as wound infection, nerve injury, screw loosening, malunion or nonunion of fracture were absent. For clinical assessment, considerable mprovements were observed for the AOFAS and VAS scores at 4 and 12 months postoperatively for both techniques. There was no significant difference for AOFAS scores and VAS scores between the two techniques (p > 0.05). Both techniques showed good functional outcome and were performed for posterior talar process fracture following the fracture displacement guidelines. Percutaneous screw fixation treatment with computer-assisted three-dimensional evaluation shortened the operation time and reduced incidences of surgical complications.

scholarly journals Novel open-source 3D-printed eye mount (TEMPO) for the ophthalmology wet lab

2021 ◽  
Vol 6 (1) ◽  
pp. e000685
Author(s):  
Michael Mak ◽  
Yejun Hong ◽  
William Murray Trask ◽  
Randy Thompson ◽  
Helen Chung ◽  
...  
Keyword(s):  
3D Printing ◽  
Open Source ◽  
Surgical Training ◽  
Computer Aided Design ◽  
Anatomical Variation ◽  
Three Dimensional ◽  
Computer Assisted ◽  
3D Printed ◽  
Wet Lab ◽  
Facial Contours

ObjectiveProcuring an affordable eye mount that can stabilise a cadaveric eye and simulate a patient’s normal facial contours represents an ongoing challenge in the ophthalmology simulation wet lab, with notable limitations to all currently available commercial options. This project uses computer-assisted design and three-dimensional (3D)-printing techniques to tackle these challenges for ophthalmologic surgical training.Methods and AnalysisProof-of-concept study. Using Autodesk Fusion 360, we designed and 3D-printed a modular device that consists of 11 pieces forming a head structure. Standard OR tubing and syringes were adapted to create an adjustable-suction system to affix cadaveric eyes. Further modular inserts were customised to house non-cadaveric simulation eyes.ResultsThree-dimensional eye mount for procedures in ophthalmology (TEMPO) reliably fixed a cadaveric eye in stable position throughout surgical manipulation. Trainees were able to drape and practice appropriate hand positioning while corneal suturing. Overall, this model was affordable, at a cost of approximately $C200 to print. The modular nature renders individual pieces convenient for replacement and customisable to simulate regional anatomical variation and accommodate non-cadaveric eyes.ConclusionsTEMPO represents an affordable, high-fidelity alternative to existing commercially available eye mounts. It reliably fixates cadaveric and simulation eyes and provides an enhanced surgical training experience by way of its realistic facial contours. It is released as an open-source computer-aided design file, customisable to interested trainees with appropriate software and 3D-printing capacity.

scholarly journals Effects of Steam Sterilization on 3D Printed Biocompatible Resin Materials for Surgical Guides—An Accuracy Assessment Study

2020 ◽  
Vol 9 (5) ◽  
pp. 1506 ◽  
Author(s):  
Neha Sharma ◽  
Shuaishuai Cao ◽  
Bilal Msallem ◽  
Christoph Kunz ◽  
Philipp Brantner ◽  
...  
Keyword(s):  
Accuracy Assessment ◽  
Three Dimensional ◽  
Dimensional Accuracy ◽  
Hand Surgery ◽  
Computer Assisted Surgery ◽  
Third Party ◽  
Computer Assisted ◽  
Steam Sterilization ◽  
Surgical Guides ◽  
3D Printed

Computer-assisted surgery with three-dimensional (3D) printed surgical guides provides more accurate results than free-hand surgery. Steam sterilization could be one of the factors that affect the dimensions of surgical guide resin materials, leading to inaccuracies during surgeries. The purpose of this study was to evaluate the effects of steam sterilization on the dimensional accuracy of indication-specific hollow cube test bodies, manufactured in-house using Class IIa biocompatible resin materials (proprietary and third-party). To evaluate the pre- and post-sterilization dimensional accuracy, root mean square (RMS) values were calculated. The results indicate that, in all the groups, steam sterilization resulted in an overall linear expansion of the photopolymeric resin material, with an increase in outer dimensions and a decrease in inner dimensions. The effects on the dimensional accuracy of test bodies were not statistically significant in all the groups, except PolyJet Glossy (p > 0.05). The overall pre- and post-sterilization RMS values were below 100 and 200 µm, respectively. The highest accuracies were seen in proprietary resin materials, i.e., PolyJet Glossy and SLA-LT, in pre- and post-sterilization measurements, respectively. The dimensional accuracy of third-party resin materials, i.e., SLA-Luxa and SLA-NextDent, were within a comparable range as proprietary materials and can serve as an economical alternative.

scholarly journals Definition of a Safe Zone for Screw Fixation of Posterior Talar Process Fracture by Three-dimensional Technology

2018 ◽  
Vol 3 (3) ◽  
pp. 2473011418S0033
Author(s):  
Haijiao Mao
Keyword(s):  
Surgical Technique ◽  
Screw Fixation ◽  
Three Dimensional ◽  
Operation Time ◽  
Safe Zone ◽  
Computer Assisted ◽  
Maximum Height ◽  
Percutaneous Screw Fixation ◽  
Posterior Process ◽  
Complex Anatomy

Category: Hindfoot Introduction/Purpose: Percutaneous screw fixation can provide stable fixation with a minimally invasive surgical technique for posterior talar process fracture . This surgical technique is limited procedure due to the complex anatomy of the posterior talar process and the varying narrow safe bony zone. The purpose of this study was to investigate the optimal posterior screw placement and the geometry of safe zones for screw insertion in the posterior talar process by analyzing with three-dimensional technology. Methods: One hundred adult who had feet CT scans were evaluated. CT data were imported into Mimics 18.01 software for three -dimensional reconstruction; Two 3.0mm-diameter screws were simulated from the posterior to anterior position for posterior talar process. The morphology parameters of posterior talar process was also quantitatively measured. The incidences of safe at different angles were investigated in order to determine optimal angle for screw direction. The safe zone and the length and entry point of screw were defined. Results: The safe zone was mainly between the 30% location and the 60% location; the width of each safe zone was13.6±1.4; the maximum height of each safe zone was 7.8±1.2. The height of the safe zone was lowest at the 30% location (4.5) and highest at the 50% location (7.3). The mixed safe zone of all talar was between the 50% location and the 60% location And inserting a 48.7 mm screw, 5.6 cm laterally and 7.4 cm superiorly from the lateral tubercle of the posterior process of the talus towards the talar head is safest. The second screw best position is the medial posterior process the talus. Conclusion: The zones for safe screw positioning are very narrow, making percutaneous screw fixation of the posterior talar process a challenging procedure. The predefined angles with computer-assisted three-dimensional techniques for the most frequently positioned percutaneous screws may aid in preoperative planning, shorten the operation time and reduce the incidence of surgical complications.

scholarly journals Development of a 3D-printed Medication Label for the Blind and Visually Impaired

2020 ◽  
Vol 6 (2) ◽  
Author(s):  
Yijun Wong ◽  
Yihua Xu ◽  
Lifeng Kang ◽  
Kevin Yi-Lwern Yap
Keyword(s):  
Visually Impaired ◽  
Medication Management ◽  
Three Dimensional ◽  
Acrylonitrile Butadiene Styrene ◽  
Computer Assisted ◽  
Blind And Visually Impaired ◽  
Target Organs ◽  
Medication Dose ◽  
3D Printed ◽  
Medication Label

This study explored the potential of three-dimensional printing (3DP) technology in producing a three-dimensional (3D) medication label for blind and visually impaired (BVI) patients to ease their drug administration. Different variations of label wordings, dosing instructions, and medication identifiers were designed with reference to guidelines by the American Foundation for the Blind. Shapes and symbols were used as dosing instructions and medication identifiers to the patient’s medical conditions. Prototype designs were created with common graphics computer-assisted drafting software and 3D-printed using acrylonitrile butadiene styrene as the polymer filament. Feedback was then obtained from five people with normal vision and four BVI persons. The initial prototype comprised four components, namely, medication name and strength, patient’s name, dosing instruction, and medication identifier. A revised label comprising the latter two components was developed after feedback by BVI persons. Words were in all uppercase and regular font type, with a 5-mm center-to-center letter spacing. Elevation heights of the letters alternated between 1 mm and 1.5 mm. A half sphere represented the medication dose unit, while vertical lines and a horizontal center line with alternating elevation of arrowheads represented the frequency of administration and the medication’s consumption in relation to food, respectively. Symbols based on target organs were used as medication identifiers. With rapid advancements in 3DP technologies, there is tremendous potential for producing 3D labels in patients’ medication management.

Computer Assisted Image Reconstruction of Oligomer Structure

1976 ◽  
Vol 34 ◽  
pp. 472-473
Author(s):  
A.M. Jones ◽  
A. Max Fiskin
Keyword(s):  
Three Dimensional ◽  
Depth Of Field ◽  
Computer Assisted ◽  
Projection Data ◽  
Two Dimensional ◽  
Single Particles ◽  
Dimensional Reconstruction ◽  
Computer Assisted Image ◽  
The Fourier Transform ◽  
Space Approach

If the tilt of a specimen can be varied either by the strategy of observing identical particles orientated randomly or by use of a eucentric goniometer stage, three dimensional reconstruction procedures are available (l). If the specimens, such as small protein aggregates, lack periodicity, direct space methods compete favorably in ease of implementation with reconstruction by the Fourier (transform) space approach (2). Regardless of method, reconstruction is possible because useful specimen thicknesses are always much less than the depth of field in an electron microscope. Thus electron images record the amount of stain in columns of the object normal to the recording plates. For single particles, practical considerations dictate that the specimen be tilted precisely about a single axis. In so doing a reconstructed image is achieved serially from two-dimensional sections which in turn are generated by a series of back-to-front lines of projection data.

Use of Three-dimensional Printing in the Development of Optimal Cardiac CT Scanning Protocols

2020 ◽  
Vol 16 (8) ◽  
pp. 967-977
Author(s):  
Zhonghua Sun
Keyword(s):  
Cardiovascular Disease ◽  
Cardiac Computed Tomography ◽  
Three Dimensional ◽  
Ct Scanning ◽  
Aortic Diseases ◽  
Clinical Value ◽  
Three Dimensional Printing ◽  
Doctor Patient Communication ◽  
Medical Education And Training ◽  
3D Printed

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.

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