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H Wang, P J Lv, Y Wang, Y C Sun
OBJECTIVE: To quantitatively evaluate the assembly precision of fabricating complete denture by computer numerical control (CNC) in manufacturing dentition and baseplate separately plus adhesive molding. METHODS: The 3D surface data of a standard edentulous maxilla plaster cast model and the temporary base-plate were obtained using an Activity 880 3D scanner. The data (data1) of a complete denture were designed using a set of computer aided design (CAD) software developed by the research group of this study...
October 18, 2016: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Katherine R Kavanagh, Valerie Cote, Yvonne Tsui, Simon Kudernatsch, Donald R Peterson, Tulio A Valdez
OBJECTIVE: Simulation to acquire and test technical skills is an essential component of medical education and residency training in both surgical and nonsurgical specialties. High-quality simulation education relies on the availability, accessibility, and reliability of models. The objective of this work was to describe a practical pediatric laryngeal model for use in otolaryngology residency training. Ideally, this model would be low-cost, have tactile properties resembling human tissue, and be reliably reproducible...
October 12, 2016: Laryngoscope
K Y Tian, Q Q Li, X J Liu, X X Wang, Z L Li, X Wang
Objective: To establish a computer-aided surgical simulation procedure based on the natural head position(NHP) for orthognathic surgery and to access the effect for correcting facial asymmetry for skeletal Class Ⅲ deformity. Methods: Thirty-five patients(male: 14 and female: 21, mean age: [21.5±2.3] years) of skeletal Class Ⅲ deformity with facial asymmetry were included and divided into virtual group (16 patients) and control group(19 patients). The computer-aided surgical simulation procedure was used in the virtual group and the intermediate and final splints were fabricated using the rapid protyping technique...
October 9, 2016: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
Tian Zhao, Huifang Yang, Huaxin Sui, Satyajeet Sudhir Salvi, Yong Wang, Yuchun Sun
OBJECTIVE: Developments in digital technology have permitted researchers to study mandibular movements. Here, the accuracy of a real-time, computerized, binocular, three-dimensional (3D) trajectory-tracking device for recording functional mandibular movements was evaluated. METHODS: An occlusal splint without the occlusal region was created based on a plaster cast of the lower dentition. The splint was rigidly connected with a target on its labial side and seated on the cast...
2016: PloS One
Peyman Sardari Nia, Samuel Heuts, Jean Daemen, Peter Luyten, Jindrich Vainer, Jan Hoorntje, Emile Cheriex, Jos Maessen
OBJECTIVES: Mitral valve repair performed by an experienced surgeon is superior to mitral valve replacement for degenerative mitral valve disease; however, many surgeons are still deterred from adapting this procedure because of a steep learning curve. Simulation-based training and planning could improve the surgical performance and reduce the learning curve. The aim of this study was to develop a patient-specific simulation for mitral valve repair and provide a proof of concept of personalized medicine in a patient prospectively planned for mitral valve surgery...
September 27, 2016: Interactive Cardiovascular and Thoracic Surgery
V A Parunov, P V Yurkovets, I Yu Lebedenko
The aim of the study was to examine changes in physical and mechanical properties of dental alloys depending of the initial composition at re-casting. Russianc precious alloys: Plagodent (AuPtPd) and Palladent (PdAu) and base alloys: Vitiriy-N (NiCrMo) and Vitiriy-C (CoCrMo) were used as study samples, which were divided in three groups: a primary casting from the granules; 50% of re-casting; 100% of re-casting. We investigated the yield strength in bending, coefficient of thermal expansion and hardness. Changing in the composition of the alloys has led to changes of all physical and mechanical properties...
2016: Stomatologii︠a︡
Sorin Mihali, Silvana Canjau, Emanuel Bratu, Hom-Lay Wang
PURPOSE: The aim of this study was to evaluate, in a case control study, the esthetic and functional clinical performance of ceramic inlays used for covering the screw access hole in single monolithic lithium disilicate full-contour crowns bonded on computer-aided design/computer-aided manufacturing (CAD/CAM) prefabricated titanium abutments in order to eliminate the drawbacks of alternative restorative methods. MATERIALS AND METHODS: Twenty-eight patients with missing teeth in the lateral areas (premolars and molars) received screw-retained implant restorations...
September 2016: International Journal of Oral & Maxillofacial Implants
T Smektala, A Goląb, M Królikowski, M Slojewski
OBJECTIVE: The aim of this brief report was to present and evaluate workflow of preparation of lowcost individual silicone replicas of kidneys for laparoscopic training and surgical simulation of difficult nephron sparing surgeries. METHODS: The work flow consists of four steps: 1.Image segmentation; 2.Casting mould designing; 3.Manufacturing of casting mould; 4.Silicone replica casting. To evaluate the cost and time required to execute the presented method, authors prepared 5 silicone models for 5 consecutive patients undergoing laparoscopic kidney tumorectomy due to renal cell cancer...
September 2016: Archivos Españoles de Urología
Chengpeng Chen, Benjamin T Mehl, Akash S Munshi, Alexandra D Townsend, Dana M Spence, R Scott Martin
A mini-review with 79 references. In this review, the most recent trends in 3D-printed microfluidic devices are discussed. In addition, a focus is given to the fabrication aspects of these devices, with the supplemental information containing detailed instructions for designing a variety of structures including: a microfluidic channel, threads to accommodate commercial fluidic fittings, a flow splitter; a well plate, a mold for PDMS channel casting; and how to combine multiple designs into a single device. The advantages and limitations of 3D-printed microfluidic devices are thoroughly discussed, as are some future directions for the field...
August 21, 2016: Analytical Methods: Advancing Methods and Applications
Khaled E Ahmed, John Whitters, Xiangyang Ju, S Gareth Pierce, Charles N MacLeod, Colin A Murray
PURPOSE: The aim of this study was to detail and assess the capability of a novel methodology to 3D-quantify tooth wear progression in a patient over a period of 12 months. MATERIALS AND METHODS: A calibrated stainless steel model was used to identify the accuracy of the scanning system by assessing the accuracy and precision of the contact scanner and the dimensional accuracy and stability of casts fabricated from three different types of impression materials. Thereafter, the overall accuracy of the 3D scanning system (scanner and casts) was ascertained...
September 2016: International Journal of Prosthodontics
Margaret A Nowicki, Nathan J Castro, Michael W Plesniak, Lijie Grace Zhang
Osteochondral tissue has a complex graded structure where biological, physiological, and mechanical properties vary significantly over the full thickness spanning from the subchondral bone region beneath the joint surface to the hyaline cartilage region at the joint surface. This presents a significant challenge for tissue-engineered structures addressing osteochondral defects. Fused deposition modeling (FDM) 3D bioprinters present a unique solution to this problem. The objective of this study is to use FDM-based 3D bioprinting and nanocrystalline hydroxyapatite for improved bone marrow human mesenchymal stem cell (hMSC) adhesion, growth, and osteochondral differentiation...
October 14, 2016: Nanotechnology
Thiago Slaviero, Thais Maria Freire Fernandes, Paula Vanessa Pedron Oltramari-Navarro, Ana Claudia de Castro Ferreira Conti, Marcelo Lupion Poleti, Marcio Rodrigues de Almeida
OBJECTIVE: To evaluate the dimensional changes of dental arches on digital models of open bite treatment with fixed and removable palatal cribs. MATERIALS AND METHODS: The sample comprised 41 patients of both sexes who were white, aged 7-10 years, and who had mixed dentition, Angle Class I molar relationship, and a negative overbite of at least 1 mm. The sample was randomly divided into two groups: G1, fixed palatal crib; and G2, removable palatal crib. Cast models, obtained initially (T1) and after 1 year of treatment (T2), were scanned by a three-dimensional (3D) scanner, 3Shape R700, producing a 3D image...
September 6, 2016: Angle Orthodontist
Liang Yang, Shivkumar Vishnempet Shridhar, Melissa Gerwitz, Pranav Soman
No abstract text is available yet for this article.
2016: Biofabrication
Muhanad M Hatamleh, Gurprit Bhamrah, Francine Ryba, Gavin Mack, Chrisopher Huppa
This patient report describes simultaneous bimaxillary orthognathic surgery and mandibular reconstruction by means of three-dimensional (3D) planning, 3D printed biocompatible surgical wafers, and 3D selective-laser sintered titanium implant. A 26-year-old male patient presented with a left mandibular defect secondary to trauma. The whole body of the mandible on the left hand side was deficient with a narrow connection with the remaining left condyle. He had undergone orthodontic treatment for 18 months and was ready to undergo bimaxillary orthognathic surgery...
October 2016: Journal of Craniofacial Surgery
Michael G McCoy, Bo Ri Seo, Siyoung Choi, Claudia Fischbach
UNLABELLED: Neovascularization is a hallmark of physiological and pathological tissue remodeling that is regulated in part by the extracellular matrix (ECM). Collagen I hydrogels or Matrigel are frequently used to study vascular network formation; however, in isolation these materials do not typically mimic the integrated effects of ECM structure and composition that may influence endothelial cells in vivo. Here, we have utilized microfabricated 3D culture models to control collagen I microstructure in the presence and absence of Matrigel and tested the effect of these variations on vascular network formation by human cerebral microvascular endothelial cells (hCMECs)...
October 15, 2016: Acta Biomaterialia
Sandra Sjostrand, Alice Widerstrom, Asa Ahlgren, Magnus Cinthio
The longitudinal movement of the arterial wall of large human arteries has shown promise to be an independent indicator of vascular health. Despite growing interest in this movement, its nature, causes and implications are not fully understood, and existing phantoms have failed to show a pure longitudinal movement that is not secondary to the distension. An often overlooked aspect of the arterial wall is the interaction between the different layers. The longitudinal movement of the innermost layers, the intima and media, can be several hundred micrometers in the direction of flow during early systole...
August 2, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Seyed Amir Oleyaei, Hadi Almasi, Babak Ghanbarzadeh, Ali Akbar Moayedi
In this study, ternary potato starch (PS) bionanocomposite films containing two types of nanoparticles, sodium montmorillonite (MMT), one-dimensional (1D) clay platelets, (3 and 5wt%) and TiO2, three-dimensional (3D) nanospheres, (0.5, 1 and 2wt%), are prepared using solvent casting method. X-ray diffraction (XRD) test confirms the completely exfoliated structure formed in the PS-MMT nanocomposites containing 3 and 5% MMT. The success of the formation of new hydrogen bonds between the hydroxyl groups of starch and nanofillers is confirmed by Fourier transform infrared (FTIR) spectroscopy...
November 5, 2016: Carbohydrate Polymers
Z W Hu, W W Li, X Y Zhang, B L Fan, Y Wang, Y C Sun
OBJECTIVE: To develop a aided mechanical appliance for rapid reconstruction of three-dimensional(3D)relationship of dentition model after scanning and evaluation of its accuracy. METHODS: The appliance was designed by forward engineering software and fabricated by a high precision computer numerical control(CNC)system. It contained upper and lower body, magnetic pedestal and three pillars. Nine 3 mm diameter hemispheres were distributed equally on the axial surface of each pedestal...
August 2016: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
Po Ki Yuen
A novel method for integrating and embedding objects to add new functionalities during 3D printing based on fused deposition modeling (FDM) (also known as fused filament fabrication or molten polymer deposition) is presented. Unlike typical 3D printing, FDM-based 3D printing could allow objects to be integrated and embedded during 3D printing and the FDM-based 3D printed devices do not typically require any post-processing and finishing. Thus, various fluidic devices with integrated glass cover slips or polystyrene films with and without an embedded porous membrane, and optical devices with embedded Corning(®) Fibrance™ Light-Diffusing Fiber were 3D printed to demonstrate the versatility of the FDM-based 3D printing and embedding method...
July 2016: Biomicrofluidics
Georg Fischer, Eli M Sarnat, Evan P Economo
The Fijian islands, a remote archipelago in the southwestern Pacific, are home to a number of spectacular endemic radiations of plants and animals. Unlike most Pacific archipelagos, these evolutionary radiations extend to social insects, including ants. One of the most dramatic examples of ant radiation in Fiji has occurred in the hyperdiverse genus Pheidole. Most of the 17 native Fijian Pheidole belong to one of two species groups that descended from a single colonization, yet have evolved dramatically contrasting morphologies: the spinescent P...
2016: PloS One
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