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https://www.readbyqxmd.com/read/29323129/comparison-of-adaptation-between-the-major-connectors-fabricated-from-intraoral-digital-impressions-and-extraoral-digital-impressions
#1
Ning Gan, Yaye Ruan, Jian Sun, Yaoyang Xiong, Ting Jiao
The objective was to compare the adaptation between the major connectors of removable partial dentures derived from intraoral digital impressions and extraoral digital impressions. Twenty-four volunteers were enrolled. Each volunteer received an intraoral digital impression and one extraoral digital impression digitized from conventional gypsum impression. A software was used to create the major connectors on digital impression datasets. After all the virtual major connectors designed from Group intraoral digital impressions (Group I) and Group extraoral digital impressions (Group E) were directly fabricated by 3D printing technique, the adaptation of the final major connectors in volunteers' mouths were measured...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29315068/-is-the%C3%A2-precision-of-intraoral-digital-impressions-in-orthodontics-enough
#2
Romain Duvert, Sarah Gebeile-Chauty
INTRODUCTION: Replacing impression by intraoral camera is a paradigm shift. However no in vivo independent studies have compared the accuracy of analog impressions with three systems of digital impression. Are digital recordings precise enough for our orthodontic practices? MATERIALS AND METHODS: Five impressions of the maxillary and mandibular arch of the same subject were conducted in vinylpolysiloxane, cast in plaster type IV then scanned by a laboratory scanner (VPS group)...
December 2017: L' Orthodontie Française
https://www.readbyqxmd.com/read/29279766/evaluation-of-marginal-and-internal-gap-of-three-unit-metal-framework-according-to-subtractive-manufacturing-and-additive-manufacturing-of-cad-cam-systems
#3
Dong-Yeon Kim, Eo-Bin Kim, Hae-Young Kim, Ji-Hwan Kim, Woong-Chul Kim
PURPOSE: To evaluate the fit of a three-unit metal framework of fixed dental prostheses made by subtractive and additive manufacturing. MATERIALS AND METHODS: One master model of metal was fabricated. Twenty silicone impressions were made on the master die, working die of 10 poured with Type 4 stone, and working die of 10 made of scannable stone. Ten three-unit wax frameworks were fabricated by wax-up from Type IV working die. Stereolithography files of 10 three-unit frameworks were obtained using a model scanner and three-dimensional design software on a scannable working die...
December 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29249886/the-use-of-cone-beam-computed-tomography-and-three-dimensional-printing-technology-in-the-restoration-of-a-maxillectomy-patient-using-a-dental-implant-retained-obturator
#4
George Michelinakis
This case report presents an alternative method for fabricating an obturator for patients that develop xerostomia and mild trismus following radiation to the Head and Neck region. Multiple initial impression stages are avoided leading to less irritation to soft tissues and less discomfort to the patient. A 69-year-old male patient was referred to our dental practice by the Maxillofacial Surgery Department of the local General Hospital. The patient had undergone a right maxillectomy for removal of a Squamous Cell Carcinoma 2 weeks prior...
October 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/29249881/marginal-and-internal-fit-of-cobalt-chromium-copings-fabricated-using-the-conventional-and-the-direct-metal-laser-sintering-techniques-a-comparative-in-vitro-study
#5
Sujana Ullattuthodi, Kandathil Phillip Cherian, R Anandkumar, M Sreedevi Nambiar
Background and Objectives: This in vitro study seeks to evaluate and compare the marginal and internal fit of cobalt-chromium copings fabricated using the conventional and direct metal laser sintering (DMLS) techniques. Methods: A master model of a prepared molar tooth was made using cobalt-chromium alloy. Silicone impression of the master model was made and thirty standardized working models were then produced; twenty working models for conventional lost-wax technique and ten working models for DMLS technique...
October 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/29246490/accuracy-and-precision-of-3-intraoral-scanners-and-accuracy-of-conventional-impressions-a-novel-in-vivo-analysis-method
#6
R Nedelcu, P Olsson, I Nyström, J Rydén, A Thor
OBJECTIVE: To evaluate a novel methodology using industrial scanners as a reference, and assess in vivo accuracy of 3 intraoral scanners (IOS) and conventional impressions. Further, to evaluate IOS precision in vivo. METHODS: Four reference-bodies were bonded to the buccal surfaces of upper premolars and incisors in five subjects. After three reference-scans, ATOS Core 80 (ATOS), subjects were scanned three times with three IOS systems: 3M True Definition (3M), CEREC Omnicam (OMNI) and Trios 3 (TRIOS)...
December 12, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/29192293/digital-evaluation-of-the-fit-of-zirconia-reinforced-lithium-silicate-crowns-with-a-new-three-dimensional-approach
#7
Moritz Zimmermann, Andre Valcanaia, Gisele Neiva, Albert Mehl, Dennis Fasbinder
OBJECTIVE: Several methods for the evaluation of fit of computer-aided design/computer-assisted manufacture (CAD/CAM)-fabricated restorations have been described. In the study, digital models were recorded with an intraoral scanning device and were measured using a new three-dimensional (3D) computer technique to evaluate restoration internal fit. The aim of the study was to evaluate the internal adaptation and fit of chairside CAD/CAM-fabricated zirconia-reinforced lithium silicate ceramic crowns fabricated with different post-milling protocols...
November 30, 2017: Quintessence International
https://www.readbyqxmd.com/read/29191608/a-fully-digital-approach-to-replicate-functional-and-aesthetic-parameters-in-implant-supported-full-arch-rehabilitation
#8
Carlo Monaco, Nicola Ragazzini, Lorenzo Scheda, Edoardo Evangelisti
PURPOSE: The aim of this technical procedure was to use a fully digital technique (FDT) for full-arch implant support rehabilitation. The FDT was used to transfer the provisional restoration parameters to definitive restorations using intraoral scanners. METHODS: Three sets of digital impressions were obtained. Through the first set, standard tessellation language 1 (STL1), provisional restorations screwed to implants and the surrounding gingival tissue was captured...
November 27, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29182151/using-convolutional-neural-networks-to-estimate-time-of-flight-from-pet-detector-waveforms
#9
Eric Berg, Simon R Cherry
Although there have been impressive strides in detector development for time-of-flight positron emission tomography (PET), most detectors still make use of simple signal processing methods to extract the time-of-flight information from the detector signals. In most cases, the timing pick-off for each waveform is computed using leading edge discrimination or constant fraction discrimination, as these were historically easily implemented with analog pulse processing electronics. However, now with the availability of fast waveform digitizers, there is opportunity to make use of more of the timing information contained in the coincident detector waveforms with advanced signal processing techniques...
November 28, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29173866/computer-aided-design-and-manufacture-of-hyrax-devices-can-we-really-go-digital
#10
Simon Graf, Marie A Cornelis, Gustavo Hauber Gameiro, Paolo M Cattaneo
The aim of this pilot study was to illustrate the feasibility of a new digital procedure to fabricate metallic orthodontic appliances. Hyrax appliances for rapid palatal expansion were produced for 3 patients using a CAD/CAM procedure without physical impressions or printed models. The work flow consisted of intraoral scanning, digital design with incorporation of a scanned prefabricated expansion screw, direct 3-dimensional metal printing via laser melting, welding of an expansion screw, insertion, and finally activation in the patients' mouths...
December 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/29171091/internal-fit-of-three-unit-fixed-dental-prostheses-produced-by-computer-aided-design-computer-aided-manufacturing-and-the-lost-wax-metal-casting-technique-assessed-using-the-triple-scan-protocol
#11
Bjørn E Dahl, Jon E Dahl, Hans J Rønold
Suboptimal adaptation of fixed dental prostheses (FDPs) can lead to technical and biological complications. It is unclear if the computer-aided design/computer-aided manufacturing (CAD/CAM) technique improves adaptation of FDPs compared with FDPs made using the lost-wax and metal casting technique. Three-unit FDPs were manufactured by CAD/CAM based on digital impression of a typodont model. The FDPs were made from one of five materials: pre-sintered zirconium dioxide; hot isostatic pressed zirconium dioxide; lithium disilicate glass-ceramic; milled cobalt-chromium; and laser-sintered cobalt-chromium...
November 24, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/29160155/design-and-manufacturing-ofpatient-specific-orthodonticappliances-by-computer-aided-engineering-techniques
#12
Sandro Barone, Paolo Neri, Alessandro Paoli, Armando Viviano Razionale
Orthodontic treatments are usually performed using fixed brackets or removable oral appliances, which are traditionally made from alginate impressions and wax registrations. Among removable devices, eruption guidance appliances are used for early orthodontic treatments in order to intercept and prevent malocclusion problems. Commercially available eruption guidance appliances, however, are symmetric devices produced using a few standard sizes. For this reason, they are not able to meet all the specific patient's needs since the actual dental anatomies present various geometries and asymmetric conditions...
November 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29154615/differential-discounting-and-present-impact-of-past-information
#13
Laura Brandimarte, Joachim Vosgerau, Alessandro Acquisti
How does information about a person's past, accessed now, affect individuals' impressions of that person? In 2 survey experiments and 2 experiments with actual incentives, we compare whether, when evaluating a person, information about that person's past greedy or immoral behaviors is discounted similarly to information about her past generous or moral behaviors. We find that, no matter how far in the past a person behaved greedily or immorally, information about her negative behaviors is hardly discounted at all...
November 20, 2017: Journal of Experimental Psychology. General
https://www.readbyqxmd.com/read/29153748/marginal-discrepancy-of-noble-metal-ceramic-fixed-dental-prosthesis-frameworks-fabricated-by-conventional-and-digital-technologies
#14
Ahmed Afify, Stephan Haney, Ronald Verrett, Michael Mansueto, James Cray, Russell Johnson
STATEMENT OF PROBLEM: Studies evaluating the marginal adaptation of available computer-aided design and computer-aided manufacturing (CAD-CAM) noble alloys for metal-ceramic prostheses are lacking. PURPOSE: The purpose of this in vitro study was to evaluate the vertical marginal adaptation of cast, milled, and direct metal laser sintered (DMLS) noble metal-ceramic 3-unit fixed partial denture (FDP) frameworks before and after fit adjustments. MATERIAL AND METHODS: Two typodont teeth were prepared for metal-ceramic FDP abutments...
November 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29095786/digital-implant-impression-technique-accuracy-a-systematic-review
#15
Marzieh Alikhasi, Mohammed Hussein M Alsharbaty, Mohammad Moharrami
PURPOSE: The objective was to provide a comprehensive systematic review about the accuracy of digital implant impression in comparison with the conventional implant impression approach. MATERIALS AND METHODS: PubMed, Google Scholar and Cochrane databases were used to classify the related articles with no year limitation in 3 stages by 2 reviewers. Finally, 10 articles were included based on inclusion and exclusion criteria. RESULTS: Five articles supported the use of intraoral scanners in implant dentistry...
December 2017: Implant Dentistry
https://www.readbyqxmd.com/read/29078302/temporary-sharing-prompts-unrestrained-disclosures-that-leave-lasting-negative-impressions
#16
Reto Hofstetter, Roland Rüppell, Leslie K John
With the advent of social media, the impressions people make on others are based increasingly on their digital disclosures. However, digital disclosures can come back to haunt, making it challenging for people to manage the impressions they make. In field and online experiments in which participants take, share, and evaluate self-photographs ("selfies"), we show that, paradoxically, these challenges can be exacerbated by temporary-sharing media-technologies that prevent content from being stored permanently...
November 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29072243/evaluation-of-digital-model-accuracy-and-time-dependent-deformation-of-alginate-impressions
#17
M G Cesur, I K Omurlu, T Ozer
OBJECTIVES: The aim of this study was to evaluate the accuracy of digital models produced with the three-dimensional dental scanner, and to test the dimensional stability of alginate impressions for durations of immediately (T0), 1 day (T1), and 2 days (T2). MATERIALS AND METHODS: A total of sixty impressions were taken from a master model with an alginate, and were poured into plaster models in three different storage periods. Twenty impressions were directly scanned (negative digital models), after which plaster models were poured and scanned (positive digital models) immediately...
September 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29072207/evaluation-of-sexual-dimorphism-using-permanent-maxillary-first-molar-in-sri-ganganagar-population
#18
Sakshi Mehta, Sukhleen Kaur, Pradhuman Verma, Rameen Khosa, Madhu Sudan, Harpreet Kaur
AIM OF STUDY: The aim is to evaluate existence of sexual dimorphism by variation in right and left permanent maxillary molars using buccolingual width (BLW) and mesio-distal width (MDW) measured intraorally and on study casts among Sri Ganganagar population. MATERIALS AND METHODS: Fifty patients (25 males and 25 females) with 17-25 years of age were selected. Impressions of maxillary arch were taken and the BLW and MDW were measured using digital Vernier calipers on study casts and intraorally...
September 2017: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/29065051/relationship-of-a-metopic-ridge-and-anterior-cranial-volume-measured-by-a-noninvasive-laser-shape-digitizer
#19
Nathan D Applegren, Leslie A Shock, Kristina J Aldridge, Chase D Derrick, Tomoko Tanaka, C Lynette Baker, Arshad R Muzaffar
Cranial dysmorphology observed in patients with metopic craniosynostosis varies along a spectrum of severity including varying degrees of metopic ridging, bitemporal narrowing, and trigonocephaly. Management has been based upon the subjective clinical impression of presence and severity of trigonocephaly. Severity of cranial dysmorphology does not predict the occurrence or severity of associated abnormal neurodevelopment, as children with mild-to-moderate trigonocephaly may also experience developmental delays...
October 23, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29042341/pain-self-management-for-veterans-development-and-pilot-test-of-a-stage-based-mobile-optimized-intervention
#20
Sara S Johnson, Deborah A Levesque, Lynne E Broderick, Dustin G Bailey, Robert D Kerns
BACKGROUND: Chronic pain is a significant public health burden affecting more Americans than cardiovascular disease, diabetes, and cancer combined. Veterans are disproportionately affected by chronic pain. Among previously deployed soldiers and veterans, the prevalence of chronic pain is estimated between 44% and 60%. OBJECTIVE: The objective of this research was to develop and pilot-test Health eRide: Your Journey to Managing Pain, a mobile pain self-management program for chronic musculoskeletal pain for veterans...
October 17, 2017: JMIR Medical Informatics
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