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https://www.readbyqxmd.com/read/29764458/cone-beam-computed-tomography-in-implant-dentistry-recommendations-for-clinical-use
#1
Reinhilde Jacobs, Benjamin Salmon, Marina Codari, Bassam Hassan, Michael M Bornstein
BACKGROUND: In implant dentistry, three-dimensional (3D) imaging can be realised by dental cone beam computed tomography (CBCT), offering volumetric data on jaw bones and teeth with relatively low radiation doses and costs. The latter may explain why the market has been steadily growing since the first dental CBCT system appeared two decades ago. More than 85 different CBCT devices are currently available and this exponential growth has created a gap between scientific evidence and existing CBCT machines...
May 15, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/29763504/investigational-clinical-trial-of-a-prototype-optoelectronic-computer-aided-navigation-device-for-dental-implant-surgery
#2
Asbjørn Jokstad, Brenton Winnett, Joseph Fava, David Powell, Eszter Somogyi-Ganss
PURPOSE: New digital technologies enable real-time computer-aided (CA) three-dimensional (3D) guidance during dental implant surgery. The aim of this investigational clinical trial was to demonstrate the safety and effectiveness of a prototype optoelectronic CA-navigation device in comparison with the conventional approach for planning and effecting dental implant surgery. MATERIALS AND METHODS: Study participants with up to four missing teeth were recruited from the pool of patients referred to the University of Toronto Graduate Prosthodontics clinic...
May 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29745321/selected-applications-for-current-polymers-in-prosthetic-dentistry-state-of-the-art
#3
Maciej Kawala, Joanna Smardz, Lukasz Adamczyk, Natalia Grychowska, Mieszko Wieckiewicz
BACKGROUND: Polymers are widely applied in medicine, including dentistry, i.e. in prosthodontics. AIM: The following paper is aimed at demonstrating the applications of selected modern polymers in prosthetic dentistry based on the reported literature. MATERIAL AND METHODS: The study was conducted using the PubMed, SCOPUS and CINAHL databases in relation to documents published during 1999-2017. The following keywords were used: polymers with: prosthetic dentistry, impression materials, denture base materials, bite registration materials, denture soft liners, occlusal splint materials and 3D printing...
May 10, 2018: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/29724560/parafunctional-loading-and-occlusal-device-on-stress-distribution-around-implants-a-3d-finite-element-analysis
#4
Manuel Tomás Borges Radaelli, Henrique Takashi Idogava, Aloisio Oro Spazzin, Pedro Yoshito Noritomi, Noéli Boscato
STATEMENT OF PROBLEM: An occlusal device is frequently recommended for patients with bruxism to protect implant-supported restorations and prevent marginal bone loss. Scientific evidence to support this treatment is lacking. PURPOSE: The purpose of this 3-dimensional (3D) finite element study was to evaluate the influence of an acrylic resin occlusal device, implant length, and insertion depth on stress distribution with functional and parafunctional loadings. MATERIAL AND METHODS: Computer-aided design software was used to construct 8 models...
April 30, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29723316/geometric-evaluation-of-the-effect-of-prosthetic-rehabilitation-on-facial-asymmetry-in-patients-with-unilateral-maxillectomy
#5
Amel M Aswehlee, Mariko Hattori, Mahmoud E Elbashti, Yuka I Sumita, Hisashi Taniguchi
PURPOSE: This study aimed (1) to geometrically evaluate areas of facial asymmetry in patients with two different types of maxillectomy defect compared to a control group, (2) to geometrically evaluate the effect of an obturator prosthesis on facial asymmetry, and (3) to investigate the correlation between three-dimensional (3D) deviation values and number of missing teeth. MATERIALS AND METHODS: Facial data from 13 normal control participants and 26 participants with two types of maxillectomy defect (groups 1 and 2) were acquired with a noncontact 3D digitizer...
May 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29714496/prosthetically-driven-computer-guided-implant-placement-and-restoration-using-cerec-a-case-report
#6
David Dano, Monica Stiteler, Russell Giordano
Developments in 3-dimentional (3D) diagnostic technology and advanced digital optical imaging have improved the predictability, safety, and efficiency of restoratively driven implant dentistry. Surgical procedures may now be performed in a single visit utilizing chairside, computer-aided design/computer-aided manufacturing technology and in situations when a two-stage implant protocol is indicated as demonstrated in this case. The CEREC® GALILEOS® integration workflow system was used to prosthetically plan and place an implant in the lower right mandibular first molar site, No...
May 2018: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/29713288/3d-fluid-structure-interaction-simulation-of-aortic-valves-using-a-unified-continuum-ale-fem-model
#7
Jeannette H Spühler, Johan Jansson, Niclas Jansson, Johan Hoffman
Due to advances in medical imaging, computational fluid dynamics algorithms and high performance computing, computer simulation is developing into an important tool for understanding the relationship between cardiovascular diseases and intraventricular blood flow. The field of cardiac flow simulation is challenging and highly interdisciplinary. We apply a computational framework for automated solutions of partial differential equations using Finite Element Methods where any mathematical description directly can be translated to code...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29703669/biomechanical-behavior-of-2-implant-and-single-implant-retained-mandibular-overdentures-with-conventional-or-mini-implants
#8
Marina Xavier Pisani, Anna Gabriella Camacho Presotto, Marcelo Ferraz Mesquita, Valentim Adelino Ricardo Barão, Daniel Takanori Kemmoku, Altair Antoninha Del Bel Cury
STATEMENT OF PROBLEM: The use of single or mini dental implants to retain mandibular overdentures is still questionable. PURPOSE: The purpose of this finite element analysis (FEA) study was to investigate the biomechanical behavior of 2- and single-implant-retained mandibular overdentures with conventional or mini implants. MATERIAL AND METHODS: Four 3-dimensional (3D) finite element models were constructed with the following designs of mandibular overdentures: 2 (group 2-C) and single (group 1-C) conventional external hexagon implants with ball or O-ring attachment and 2 (group 2-M) and single (group 1-M) 1-piece mini implants...
April 24, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29698788/fixation-free-femoral-hernia-repair-with-a-3d-dynamic-responsive-implant-a-case-series-report
#9
G Amato, G Romano, A Agrusa, L Gordini, Gulotta E, E Erdas, P G Calò
BACKGROUND: To date, no gold standard for the surgical treatment of femoral hernia exists. Pure tissue repair as well as mesh/plug implantation, open or laparoscopic, are the most performed methods. Nevertheless, all these techniques need sutures or mesh fixation. This implies the risk of damaging sensitive structures of the femoral area, along with complications related to tissue tear and postoperative discomfort consequent to poor quality mesh incorporation. The present retrospective multicenter case series highlights the results of femoral hernia repair procedures performed with a 3D dynamic responsive implant in a cohort of 32 patients during a mean follow up of 27 months...
April 23, 2018: International Journal of Surgery
https://www.readbyqxmd.com/read/29682823/additive-manufacturing-technologies-used-for-processing-polymers-current-status-and-potential-application-in-prosthetic-dentistry
#10
REVIEW
Marta Revilla-León, Mutlu Özcan
There are 7 categories of additive manufacturing (AM) technologies, and a wide variety of materials can be used to build a CAD 3D object. The present article reviews the main AM processes for polymers for dental applications: stereolithography (SLA), digital light processing (DLP), material jetting (MJ), and material extrusion (ME). The manufacturing process, accuracy, and precision of these methods will be reviewed, as well as their prosthodontic applications.
April 22, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29669279/prediction-of-reach-goals-in-depth-and-direction-from-the-parietal-cortex
#11
Matteo Filippini, Rossella Breveglieri, Kostas Hadjidimitrakis, Annalisa Bosco, Patrizia Fattori
The posterior parietal cortex is well known to mediate sensorimotor transformations during the generation of movement plans, but its ability to control prosthetic limbs in 3D environments has not yet been fully demonstrated. With this aim, we trained monkeys to perform reaches to targets located at various depths and directions and tested whether the reach goal position can be extracted from parietal signals. The reach goal location was reliably decoded with accuracy close to optimal (>90%), and this occurred also well before movement onset...
April 17, 2018: Cell Reports
https://www.readbyqxmd.com/read/29667640/-the-efficiency-of-the-application-of-the-modern-computed-technologies-in-the-clinical-practice-and-the-prospects-for-the-further-use-of-the-biomechanical-3d-models-in-forensic-medicine
#12
I Yu Makarov, A V Svetlakov, A V Sotin, S V Shigeev, A A Gusarov, S A Smirenin, V V Emelin, V B Stragis, V A Fetisov
To-day, the computer-assisted 3D-technologies for the mathematical simulation of the engineering facilities are extensively used for the purpose of technical calculations in all branches of industry and building. The positive experience gained with the application of the 3D-models finds wide application in the joined investigations on the topical problems of the prosthetic and surgical treatment of bones, teeth, joints, cardiac valves, blood vessels, etc. The objective of the present study was the analysis of the positive experience with the involvement of the specialists in the design and practical application of 3D-models for the solution of problems facing the medical prosthetics and the management of various pathological conditions...
2018: Sudebno-meditsinskaia Ekspertiza
https://www.readbyqxmd.com/read/29659023/a-dynamic-model-based-approach-to-motion-and-deformation-tracking-of-prosthetic-valves-from-biplane-x-ray-images
#13
Martin G Wagner, Charles R Hatt, David A P Dunkerley, Lindsay E Bodart, Amish N Raval, Michael A Speidel
PURPOSE: Transcatheter aortic valve replacement (TAVR) is a minimally invasive procedure in which a prosthetic heart valve is placed and expanded within a defective aortic valve. The device placement is commonly performed using two-dimensional fluoroscopic imaging. Within this work, we propose a novel technique to track the motion and deformation of the prosthetic valve in three dimensions based on biplane fluoroscopic image sequences. METHODS: The tracking approach uses a parameterized point cloud model of the valve stent which can undergo rigid 3D transformation and different modes of expansion...
April 16, 2018: Medical Physics
https://www.readbyqxmd.com/read/29657474/analysis-of-a-generic-talar-prosthetic-with-a-biological-talus-a-cadaver-study
#14
Alexandra N Trovato, Troy D Bornes, Marwan El-Rich, Sukhvinder S Dhillon, Samer Adeeb, Nadr M Jomha
Treatment for talar avascular necrosis is challenging. This study evaluates the feasibility of a generic talar implant by cadaveric assessment. Ten cadaveric ankles were CT-scanned to determine talar implant size. The opposite ankles were CT-scanned with the biological talus and then with the implant. 3D ankle geometry was reconstructed and implant position was compared to the biological talus position. The averages among specimens' positive and negative average-deviations were 0.91 mm and 0.70 mm. Seventy percent of talar dome deviations between the biological talus and implant were within an acceptable range...
March 2018: Journal of Orthopaedics
https://www.readbyqxmd.com/read/29655527/the-smiling-scan-technique-facially-driven-guided-surgery-and-prosthetics
#15
Alessandro Pozzi, Lorenzo Arcuri, Peter K Moy
PURPOSE: To introduce a proof of concept technique and new integrated workflow to optimize the functional and esthetic outcome of the implant-supported restorations by means of a 3-dimensional (3D) facially-driven, digital assisted treatment plan. METHODS: The Smiling Scan technique permits the creation of a virtual dental patient (VDP) showing a broad smile under static conditions. The patient is exposed to a cone beam computed tomography scan (CBCT), displaying a broad smile for the duration of the examination...
April 11, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29600349/delivery-of-brain-derived-neurotrophic-factor-by-3d-biocompatible-polymeric-scaffolds-for-neural-tissue-engineering-and-neuronal-regeneration
#16
T Limongi, A Rocchi, F Cesca, H Tan, E Miele, A Giugni, M Orlando, M Perrone Donnorso, G Perozziello, Fabio Benfenati, Enzo Di Fabrizio
Biopolymers are increasingly employed for neuroscience applications as scaffolds to drive and promote neural regrowth, thanks to their ability to mediate the upload and subsequent release of active molecules and drugs. Synthetic degradable polymers are characterized by different responses ranging from tunable distension or shrinkage to total dissolution, depending on the function they are designed for. In this paper we present a biocompatible microfabricated poly-ε-caprolactone (PCL) scaffold for primary neuron growth and maturation that has been optimized for the in vitro controlled release of brain-derived neurotrophic factor (BDNF)...
March 29, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29599025/the-type-of-approach-does-not-influence-tka-component-position-in-revision-total-knee-arthroplasty-a-clinical-study-using-3d-ct
#17
Filippo-Franco Schiapparelli, Felix Amsler, Michael T Hirschmann
BACKGROUND: The influence of the surgical approach on the position of the prosthetic components in revision of total knee arthroplasties (rTKA) is still not clear. This study compared the medial parapatellar approach (MPA) and lateral parapatellar subvastus approach with tibial tubercle osteotomy (LPA). METHODS: Forty-two consecutive patients underwent rTKA from 2006 to 2016 with either MPA (n=21) or LPA (n=21) because of aseptic loosening, infection, malposition or instability (mean follow-up: 41...
March 26, 2018: Knee
https://www.readbyqxmd.com/read/29590664/the-role-of-portable-documentation-format-in-three-dimensional-interactive-visualization-in-maxillofacial-prosthetics
#18
Mahmoud E Elbashti, Amel M Aswehlee, Yuka I Sumita, Mariko Hattori, Hisashi Taniguchi
Although digital technology has advanced the visualization of treatment planning and rehabilitation in prosthodontics, the field of maxillofacial prosthetics is in vital need of an accessible document for exchange of interactive three-dimensional (3D) model visualization without requiring installation of any additional software. This article introduces a 3D data documentation method for effective interactive digital visualization in maxillofacial prosthetics using a portable documentation format (PDF).
March 28, 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29574815/reconstruction-of-major-defects-of-the-jaws
#19
M D Batstone
Prosthetic replacements in the 19th and early 20th century were superseded by pedicled flaps and obturators. These have subsequently been superseded by free tissue transfer which currently is the mainstay of reconstructive jaw surgery. Although malignant and benign processes of the jaws are the predominant cause of segmental defects, a significant proportion still occurs due to trauma, or even iatrogenic causes such as radiotherapy. The varied aetiologies demand a nuanced approach to reconstruction and although the techniques remain similar the timing can be quite different...
March 2018: Australian Dental Journal
https://www.readbyqxmd.com/read/29547668/three-dimensional-flow-structures-past-a-bio-prosthetic-valve-in-an-in-vitro-model-of-the-aortic-root
#20
David Hasler, Dominik Obrist
The flow field past a prosthetic aortic valve comprises many details that indicate whether the prosthesis is functioning well or not. It is, however, not yet fully understood how an optimal flow scenario would look, i.e. which subtleties of the fluid dynamics in place are essential regarding the durability and compatibility of a prosthetic valve. In this study, we measured and analyzed the 3D flow field in the vicinity of a bio-prosthetic heart valve in function of the aortic root size. The measurements were conducted within aortic root phantoms of different size, mounted in a custom-built hydraulic setup, which mimicked physiological flow conditions in the aorta...
2018: PloS One
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