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3D cast

Clarisse Ribeiro, Carlos M Costa, Daniela M Correia, João Nunes-Pereira, Juliana Oliveira, Pedro Martins, Renato Gonçalves, Vanessa F Cardoso, Senentxu Lanceros-Méndez
Poly(vinylidene fluoride) (PVDF) and its copolymers are the polymers with the highest dielectric constants and electroactive responses, including piezoelectric, pyroelectric and ferroelectric effects. This semicrystalline polymer can crystallize in five different forms, each related to a different chain conformation. Of these different phases, the β phase is the one with the highest dipolar moment and the highest piezoelectric response; therefore, it is the most interesting for a diverse range of applications...
April 2018: Nature Protocols
Simon Drouin, D Louis Collins
Direct volume rendering has become an essential tool to explore and analyse 3D medical images. Despite several advances in the field, it remains a challenge to produce an image that highlights the anatomy of interest, avoids occlusion of important structures, provides an intuitive perception of shape and depth while retaining sufficient contextual information. Although the computer graphics community has proposed several solutions to address specific visualization problems, the medical imaging community still lacks a general volume rendering implementation that can address a wide variety of visualization use cases while avoiding complexity...
2018: PloS One
Carolyn Kincade, Lindsay McHutchion, Johan Wolfaardt
The present report describes the digital design of patient-specific milled abutments for the retention of osseointegrated facial prostheses by using digital technology. Patient imaging including surface scans of the patient's head, scans of the patient's definitive cast, and digitally designed prosthesis prototypes were combined to create a digital simulation of the patient. Using this simulation, patient-specific abutments were digitally designed, printed in 3-dimensions (3D), and finally copy-milled in titanium...
March 8, 2018: Journal of Prosthetic Dentistry
Pedro Martinez-Seijas, Luis A Díaz-Galvis, Josué Hernando, Ignacio O Leizaola-Cardesa, Antonio Aguilar-Salvatierra, Gerardo Gómez-Moreno
BACKGROUND: Over the years, many materials have been used in orbital reconstruction and cranioplasty. Among the materials in current use, polymethyl methacrylate (PMMA) offers a high degree of compatibility with human tissue. OBJECTIVE: This work describes a new, custom-made, 3D printing-aided, prosthetic fabrication process for orbital and/or cranial reconstruction using PMMA. METHODS: On the basis of information obtained from computerized tomography scanning processed in Digital Imaging and Communication in Medicine format and exported to treatment planning software, a 3D prosthesis master model was designed and digitally printed...
March 8, 2018: Journal of Craniofacial Surgery
Paolo Pesce, Francesco Pera, Paolo Setti, Maria Menini
PURPOSE: To evaluate the accuracy and precision of a digital scanner used to scan four implants positioned according to an immediate loading implant protocol and to assess the accuracy of an aluminum framework fabricated from a digital impression. MATERIALS AND METHODS: Five master casts reproducing different edentulous maxillae with four tilted implants were used. Four scan bodies were screwed onto the low-profile abutments, and a digital intraoral scanner was used to perform five digital impressions of each master cast...
March 2018: International Journal of Prosthodontics
Michio Aoki, Jia-Yang Juang
Conventional manufacturing techniques-moulding, machining and casting-exist to produce three-dimensional (3D) shapes. However, these industrial processes are typically geared for mass production and are not directly applicable to residential settings, where inexpensive and versatile tools are desirable. Moreover, those techniques are, in general, not adequate to process soft elastic materials. Here, we introduce a new concept of forming 3D closed hollow shapes from two-dimensional (2D) elastic ribbons by controlled buckling...
February 2018: Royal Society Open Science
Emma McCrory, Niall Jp McGuinness, Aman Ulhaq
OBJECTIVE: To determine the reproducibility of Index of Orthognathic Functional Treatment Need (IOFTN) scores derived from plaster casts and their three-dimensional (3D) digital equivalents. DESIGN: Pilot study, prospective analytical. SETTING: UK hospital orthodontic department. PARTICIPANTS: Thirty casts and their digital equivalents, representing the pre-treatment malocclusions of patients requiring orthodontic-orthognathic surgical treatment, were scored by four clinicians using IOFTN...
March 7, 2018: Journal of Orthodontics
Xiaoling Yu, Xiaosheng Cheng, Ning Dai, Hu Chen, Changjiang Yu, Yuchun Sun
BACKGROUND AND OBJECTIVE: In dentistry, the complete denture is a conventional treatment for edentulous patients. The computer-aided design and computer-aided manufacturing (CAD/CAM) has been applied on the digital complete denture which is developed rapidly. Tooth selection and arrangement is one of the most important parts in digital complete denture. In this paper, we propose a new method of personalized teeth arrangement. METHODS: This paper presents a method of arranging teeth virtually for a complete denture...
March 2018: Computer Methods and Programs in Biomedicine
Raymund E Rebong, Kelton T Stewart, Achint Utreja, Ahmed A Ghoneima
OBJECTIVES: The aim of this study was to assess the dimensional accuracy of fused deposition modeling (FDM)-, Polyjet-, and stereolithography (SLA)-produced models by comparing them to traditional plaster casts. MATERIALS AND METHODS: A total of 12 maxillary and mandibular posttreatment orthodontic plaster casts were selected from the archives of the Orthodontic Department at the Indiana University School of Dentistry. Plaster models were scanned, saved as stereolithography files, and printed as physical models using three different three-dimensional (3D) printers: Makerbot Replicator (FDM), 3D Systems SLA 6000 (SLA), and Objet Eden500V (Polyjet)...
March 6, 2018: Angle Orthodontist
Willian Saranholi da Silva, Ana Lúcia Pompéia Fraga de Almeida, Maria Giulia Rezende Pucciarelli, Karin Hermana Neppelenbroek, Juliana Dreyer da Silva de Menezes, Renato Yassutaka Faria Yaedú, Thais Marchini Oliveira, Flavia M R N Cintra, Simone Soares
This retrospective observational study aimed to evaluate and identify the relapse rate after orthognathic surgery for maxillary advancement (Le Fort I maxillary osteotomy) in oral cleft patients through digitized cephalograms and 3D dental models, following 2 years. Lateral cephalograms and dental casts of 17 individuals, enrolled in Orthodontics Department in Hospital of Rehabilitation of Craniofacial Anomalies, were carried out. The digital cephalometric tracings were evaluated in: T1-before surgery, T2-immediate after surgery, T3-6-month to 1-year after surgery...
March 1, 2018: Odontology
Zachary N Warnken, Hugh D C Smyth, Daniel A Davis, Steve Weitman, John G Kuhn, Robert O Williams
Effective targeting of nasal spray deposition could improve local, systemic, and CNS drug delivery, however, this has proven to be difficult due anatomical features of the nasal cavity including the nasal valve and turbinate structures. Furthermore, nasal cavity geometries and dimensions vary between individuals based on differences in their age, gender and ethnicity. The effect of patient-specific administration parameters was evaluated for their ability to overcome the barriers to targeted nasal drug delivery...
February 27, 2018: Molecular Pharmaceutics
M X Cheng, T Jiang, Y C Sun, H Y Zhang
OBJECTIVE: To make more accurate occlusal quantitative analysis of three-dimensional (3D) virtual dental models and to compare the occlusal contact obtained by intraoral and dental cast scan. METHODS: In this study, 5 subjects were intraoral scanned using laser scanner (3 shapes, Germany) to obtain the 3D virtual models of one tooth (the first molar), two teeth (the second premolar and the first molar), three teeth (the premolars and the first molar) and their opposite teeth, respectively...
February 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Mid-Eum Park, Soo-Yeon Shin
STATEMENT OF PROBLEM: Studies investigating the precision of 3-dimensional (3D) printed casts for fixed prosthodontics are scarce. PURPOSE: The purpose of this in vitro study was to compare the accuracy and reproducibility of dental casts made by the conventional method and by 3D printing. MATERIAL AND METHODS: A master model was designed and fabricated with polyetherketoneketone. Ten specimens were fabricated with Type IV dental stone with polyvinyl siloxane...
February 21, 2018: Journal of Prosthetic Dentistry
Rosalia Leonardi, Antonino Lo Giudice, Michele Rugeri, Simone Muraglie, Giancarlo Cordasco, Ersilia Barbato
Background and objectives: Some authors have recently postulated the possibility of a unilateral contraction of the palate in patients with crossbite. This study aimed to investigate palatal dimension size and morphology in subjects with functional posterior crossbite and to localize location of the contraction through a 3D analysis procedure. Materials and methods: A study sample (SS) of 35 subjects (mean age 9.2 ± 0.8 years), diagnosed with functional crossbite, and a control sample (CS) of 35 subjects (mean age 9...
February 21, 2018: European Journal of Orthodontics
M Revilla-León, M Olea-Vielba, A Esteso-Saiz, I Martínez-Klemm, M Özcan
STATEMENT OF THE PROBLEM: On a pressed lithium disilicate restoration, the building up of a wax pattern of the future restoration is a necessary step on the fabrication process. Conventionally, a wax pattern can be produced by handmade or milled procedures; however, the development of additive manufacturing technologies allows a new fabrication method. PURPOSE: The present study measured the marginal and internal gap of handmade, milled and additive manufactured patterns for an onlay restoration...
February 20, 2018: Community Dental Health
Robin Yong, Sarbin Ranjitkar, Dimitra Lekkas, Demetrios Halazonetis, Alistair Evans, Alan Brook, Grant Townsend
OBJECTIVES: This study aimed to investigate size and shape variation of human premolars between Indigenous Australians and Australians of European ancestry, and to assess whether sex and ancestry could be differentiated between these groups using 3D geometric morphometrics. MATERIALS AND METHODS: Seventy dental casts from each group, equally subdivided by sex, were scanned using a structured-light scanner. The 3D meshes of upper and lower premolars were processed using geometric morphometric methods...
February 15, 2018: American Journal of Physical Anthropology
Andás Szuák, Károly Németh, Csaba Korom, Endre Gáti, Kinga Karlinger, László Harsányi, Ágnes Nemeskéri
The complex arterial system makes pancreatic interventions technically challenging for surgeons, and interventional radiologists. The arterial variants may alter tumor resecability, and cause complications in arterial embolization. International data on pancreatic blood supply are variable; therefore, we aimed to determine the frequency of variants of pancreaticoduodenal (PD) arterial arcades. Arteries of human abdominal organ complexes (50) were injected with resin mixture, and then corroded. CT scans and three-dimensional reconstructions were made; diameters of arcades were measured...
February 15, 2018: Clinical Anatomy
Simone Sangiorgi, Alessandro De Benedictis, Marcella Reguzzoni, Andrea Trezza, Silvia Cossu, Carlo Efisio Marras, Silvio Bellocchi, Alessandro Manelli, Marina Protasoni
Morphological analyses of cerebral vascularization are not only important for the characterization of the anatomical and physiological relationships between vascular and nervous tissue, but also required to understand structural modifications that occur in many pathological conditions affecting the brain. The aim of this study was to generate a three-dimensional vascular map of the cerebral hemispheres in the nude mouse brain, a widely used animal model for studying tumour biology. We used the corrosion casting (CC) technique to isolate blood vessels from 30 nude mouse brains...
February 14, 2018: Journal of Anatomy
Pang-Yun Chou, Rami R Hallac, Ellen Shih, Jenny Trieu, Anjani Penumatcha, Priyanka Das, Clark A Meyer, James R Seaward, Alex A Kane
BACKGROUND: Sculpted physical models and castings of the anatomy of cleft lip and palate are used for parent, patient, and trainee education of cleft lip and palate conditions. In this study, we designed a suite of digital 3-dimensional (3D) models of cleft lip and palate anatomy with additive manufacturing techniques for patient education. METHODS: CT scans of subjects with isolated cleft palate, unilateral and bilateral cleft lip and palate, and a control were obtained...
March 2018: Cleft Palate-craniofacial Journal
Bora Lee, Kyung Chul Oh, Daewon Haam, Joon-Hee Lee, Hong-Seok Moon
STATEMENT OF PROBLEM: Intraoral scanners are effective for direct digital impression when dental restorations are fabricated using computer-aided design and computer-aided manufacturing (CAD-CAM); however, if the abutment tooth cannot be dried completely or the prepared margin is placed subgingivally, accurate digital images cannot always be guaranteed. PURPOSE: The purpose of this in vitro study was to compare the internal and marginal discrepancies of zirconia copings fabricated directly using an intraoral scanner with those fabricated indirectly with impression scanning...
February 7, 2018: Journal of Prosthetic Dentistry
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