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https://www.readbyqxmd.com/read/28781073/accuracy-of-stereolithography-additive-casts-used-in-a-digital-workflow
#1
Hiba Al-Imam, Mia Gram, Ana R Benetti, Klaus Gotfredsen
STATEMENT OF PROBLEM: Despite the increasing demand for a digital workflow in the fabrication of indirect restorations, information on the accuracy of the resulting definitive casts is limited. PURPOSE: The purpose of this in vitro study was to compare the accuracy of definitive casts produced with digital scans and conventional impressions. MATERIAL AND METHODS: Chamfer preparations were made on the maxillary right canine and second molar of a typodont...
August 4, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28771895/an-evaluation-of-the-effect-of-periodontal-biotype-on-inter-dental-papilla-proportions-distances-between-facial-and-palatal-papillae-in-the-maxillary-anterior-dentition
#2
Arshia Jameel Ahmed, Ashish S Nichani, Ranganath Venugopal
PURPOSE: Gingival esthetics are an essential segment of facial beauty. The aim of the present study was to clinically assess the impact of periodontal biotype (PB), the length between the base of interproximal contact area and the interproximal bone crest (CP-BC), the distance between the facial and palatal papillae (DFPP), and papillary proportions (PP) on the presence of interdental papillae (PIP). MATERIALS AND METHODS: 80 patients aged 18 to 60 years were recruited for study...
August 3, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28770115/comprehensive-treatments-for-congenitally-missing-teeth-and-generalized-diastema
#3
Mehran Bahrami, Fariba Saleh Saber, Amirreza Hendi
Congenitally missing teeth and/or hypodontia is a prevalent dental anomaly. There are different treatment options available for these conditions such as space maintenance, restoring the space by resin-bonded-fixed-partial-dentures (RBFPDs), and dental implants. This study addresses the comprehensive treatments for congenitally missing tooth and diastema using interdisciplinary approaches. One patient was treated with small-diameter-implants and the other one was treated using an intraoral scanner to make digital impression and fabricating RBFPDs with CAD/CAM system...
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28765443/integration-of-digital-dentistry-into-a-predoctoral-implant-program-program-description-rationale-and-utilization-trends
#4
Fatemeh S Afshari, Cortino Sukotjo, Maria F Alfaro, Jeri McCombs, Stephen D Campbell, Kent L Knoernschild, Judy Chia-Chun Yuan
A recently revised predoctoral implant curriculum at the University of Illinois at Chicago College of Dentistry integrated digital dentistry into both the preclinical dental implant course and clinical activities. Traditionally, competence in the didactic and clinical parts of predoctoral education in single tooth implant restorations has emphasized the analog impression technique and subsequent mounting of soft tissue working casts. However, computer-aided design/computer-aided manufacturing (CAD/CAM) implant restorations can play a significant role in predoctoral dental education utilizing digital technologies...
August 2017: Journal of Dental Education
https://www.readbyqxmd.com/read/28740271/fabrication-of-a-3d-printing-definitive-obturator-prosthesis-a-clinical-report
#5
Theodoros Tasopoulos, Georgios Kouveliotis, Grigoris Polyzois, Vasiliki Karathanasi
INTRODUCTION: Digital technologies related to imaging and manufacturing provide the clinician with a wide variety of treatment options. Stereolithography (SLA) offers a simple and predictable way for an accurate reconstruction of congenital or acquired defects. CLINICAL CASE: A 65-years old cancer patient with non- keratinized squamous cell carcinoma of left maxillary sinus came for a prosthetic clinical evaluation. A bilateral maxillectomy was performed and the treatment plan included definite obturator prosthesis for the upper arch...
March 2017: Acta Stomatologica Croatica
https://www.readbyqxmd.com/read/28733810/precision-of-guided-scanning-procedures-for-full-arch-digital-impressions-in-vivo
#6
Moritz Zimmermann, Christina Koller, Moritz Rumetsch, Andreas Ender, Albert Mehl
PURPOSE: System-specific scanning strategies have been shown to influence the accuracy of full-arch digital impressions. Special guided scanning procedures have been implemented for specific intraoral scanning systems with special regard to the digital orthodontic workflow. The aim of this study was to evaluate the precision of guided scanning procedures compared to conventional impression techniques in vivo. METHOD: Two intraoral scanning systems with implemented full-arch guided scanning procedures (Cerec Omnicam Ortho; Ormco Lythos) were included along with one conventional impression technique with irreversible hydrocolloid material (alginate)...
July 21, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28721994/evaluation-of-marginal-and-internal-gaps-of-metal-ceramic-crowns-obtained-from-conventional-impressions-and-casting-techniques-with-those-obtained-from-digital-techniques
#7
Rathika Rai, S Arun Kumar, R Prabhu, Ranjani Thillai Govindan, Faiz Mohamed Tanveer
BACKGROUND: Accuracy in fit of cast metal restoration has always remained as one of the primary factors in determining the success of the restoration. A well-fitting restoration needs to be accurate both along its margin and with regard to its internal surface. AIM: The aim of the study is to evaluate the marginal fit of metal ceramic crowns obtained by conventional inlay casting wax pattern using conventional impression with the metal ceramic crowns obtained by computer-aided design and computer-aided manufacturing (CAD/CAM) technique using direct and indirect optical scanning...
May 2017: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/28717635/the-fabrication-of-a-customized-occlusal-splint-based-on-the-merging-of-dynamic-jaw-tracking-records-cone-beam-computed-tomography-and-cad-cam-digital-impression
#8
Katerina Aslanidou, Chung How Kau, Christos Vlachos, Tayem Abou Saleh
OBJECTIVES: The aim of this case report was to present the procedure of fabricating a customized occlusal splint, through a revolutionary software that combines cone beam computed tomography (CBCT) with jaw motion tracking (JMT) data and superimposes a digital impression. MATERIALS AND METHODS: The case report was conducted on a 46-year-old female patient diagnosed with the temporomandibular disorder. A CBCT scan and an optical impression were obtained. The range of the patient's mandibular movements was captured with a JMT device...
July 2017: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/28715504/megalosauripus-transjuranicus-ichnosp-nov-a-new-late-jurassic-theropod-ichnotaxon-from-nw-switzerland-and-implications-for-tridactyl-dinosaur-ichnology-and-ichnotaxomy
#9
Novella L Razzolini, Matteo Belvedere, Daniel Marty, Géraldine Paratte, Christel Lovis, Marielle Cattin, Christian A Meyer
A new ichnospecies of a large theropod dinosaur, Megalosauripus transjuranicus, is described from the Reuchenette Formation (Early-Late Kimmeridgian, Late Jurassic) of NW Switzerland. It is based on very well-preserved and morphologically-distinct tracks (impressions) and several trackways, including different preservational types from different tracksites and horizons. All trackways were excavated along federal Highway A16 near Courtedoux (Canton Jura) and systematically documented in the field including orthophotos and laserscans...
2017: PloS One
https://www.readbyqxmd.com/read/28709673/stereophotogrammetric-impression-making-for-polyoxymethylene-milled-immediate-partial-fixed-dental-prostheses
#10
Miguel Gómez-Polo, Cristina Gómez-Polo, Jaime Del Río, Rocío Ortega
Immediate post-extraction and same-day placement of interim prostheses have increased patient acceptance of implant-supported prostheses. However, for immediate prostheses supported by multiple implants, meeting passive fit and esthetic standards is often challenging. In this clinical report, implant photogrammetry was combined with conventionally obtained digitized casts to prepare an interim, milled prosthesis from a polyoxymethylene (POM) disk, using computer-aided design and computer-aided manufacturing techniques...
July 11, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28703836/monolithic-zirconia-and-digital-impression-case-report
#11
F De Angelis, E Brauner, G Pignatiello, F Mencio, D Rosella, P Papi, T Di Carlo, A Giovannetti, G Pompa, S Di Carlo
AIMS: The aim of this study is to present a clinical case of a full arch prosthetic rehabilitation on natural teeth, combining both digital work-flow and monolithic zirconia. PATIENTS AND METHODS: Digital impression was taken with an intraoral optical scanner (CS3500, Carestream Dental, Atlanta, GA, USA). A prosthetic rehabilitation was realized on natural teeth using monolithic zirconia from 1.6 to 1.4 and from 2.7 to 2.4 frameworks, while in the aesthetic area (from 2...
July 2017: La Clinica Terapeutica
https://www.readbyqxmd.com/read/28701988/ened-gem-a-conceptual-framework-model-for-psychological-enjoyment-factors-and-learning-mechanisms-in-educational-games-about-the-environment
#12
Kristoffer S Fjællingsdal, Christian A Klöckner
Based on a thorough review of psychological literature, this article seeks to develop a model of game enjoyment and environmental learning (ENvironmental EDucational Game Enjoyment Model, ENED-GEM) and delineate psychological processes that might facilitate learning and inspire behavioral change from educational games about the environment. A critically acclaimed digital educational game about environmental issues (Fate of the World by Red Redemption/Soothsayer Games) was used as a case study. Two hundred forty-nine reviews of the game from the popular gaming and reviewing platform known as Steam were analyzed by means of a thematic content analysis in order to identify key player enjoyment factors believed to be relevant to the process of learning from games, as well as to gain an understanding of positive and negative impressions about the game's general content...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28697209/improvement-of-a-digital-impression-with-conventional-materials-overcoming-intraoral-scanner-limitations
#13
Federico Mandelli, Francesco Ferrini, Giorgio Gastaldi, Enrico Gherlone, Marco Ferrari
Intraoral digital impression is a viable alternative to conventional impression techniques and has been proven to be even more accurate than conventional materials. Nevertheless, there are cases in which the rheologic properties of conventional materials can be helpful. This article describes a method to overcome an insufficient sulcus-depth reading of intraoral scanners in challenging cases.
July 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28689913/a-technique-for-immediately-restoring-single-dental-implants-with-a-cad-cam-implant-supported-crown-milled-from-a-poly-methyl-methacrylate-block
#14
Periklis Proussaefs, Abdulaziz AlHelal
This technique is used when a single dental implant is placed. A stent made of autopolymerized acrylic resin was used to transfer the implant position to the laboratory. Once the implant position was transferred, the stone cast was scanned, and a computer-aided design and computer-aided manufacturing (CAD-CAM) interim implant-supported crown was milled from a poly(methyl methacrylate) (PMMA) block. A titanium insert, in contact with the implant platform and not the PMMA material, was used to support the crown...
July 7, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28689912/influence-of-scanner-powder-application-and-adjustments-on-cad-cam-crown-misfit
#15
Marcel S Prudente, Letícia R Davi, Kemilly O Nabbout, Célio J Prado, Leandro M Pereira, Karla Zancopé, Flávio D Neves
STATEMENT OF PROBLEM: The manufacturers of computer-aided design and computer-aided manufacturing (CAD-CAM) systems emphasize that new technologies can improve the marginal fit of dental crowns. However, data supporting this claim are limited. PURPOSE: The purpose of this in vitro study was to investigate the differences among the following fabrication methods on the marginal discrepancy of dental crowns: intraoral optical scanners, powder application, and adjustments of intaglio surface...
July 7, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28689906/comparison-of-digital-intraoral-scanner-reproducibility-and-image-trueness-considering-repetitive-experience
#16
Jung-Hwa Lim, Ji-Man Park, Minji Kim, Seong-Joo Heo, Ji-Yun Myung
STATEMENT OF PROBLEM: Because the digital workflow can begin directly in the oral cavity, intraoral scanners are being adopted in dental treatments. However, studies of the relationship between the experience of the practitioner and the accuracy of impression data are needed. PURPOSE: The purpose of this clinical study was to investigate the effect of the experience curve on changes in trueness when a patient's complete dental arch is scanned. MATERIAL AND METHODS: Twenty dental hygienists with more than 3 years of experience in dental clinical practice (group 1 had 3 to 5 years; group 2 had >6 years) were recruited to learn to operate 2 intraoral scanner systems...
July 7, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28680548/evaluation-of-marginal-and-internal-gaps-of-ni-cr-and-co-cr-alloy-copings-manufactured-by-microstereolithography
#17
Dong-Yeon Kim, Chong-Myeong Kim, Ji-Hwan Kim, Hae-Young Kim, Woong-Chul Kim
PURPOSE: The purpose of this study was to evaluate the marginal and internal gaps of Ni-Cr and Co-Cr copings, fabricated using the dental µ-SLA system. MATERIALS AND METHODS: Ten study dies were made using a two-step silicone impression with a dental stone (type IV) from the master die of a tooth. Ni-Cr (NC group) and Co-Cr (CC group) alloy copings were designed using a dental scanner, CAD software, resin coping, and casting process. In addition, 10 Ni-Cr alloy copings were manufactured using the lost-wax technique (LW group)...
June 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28680452/vertical-leaping-mechanics-of-the-lesser-egyptian-jerboa-reveal-specialization-for-maneuverability-rather-than-elastic-energy-storage
#18
Talia Y Moore, Alberto M Rivera, Andrew A Biewener
BACKGROUND: Numerous historical descriptions of the Lesser Egyptian jerboa, Jaculus jaculus, a small bipedal mammal with elongate hindlimbs, make special note of their extraordinary leaping ability. We observed jerboa locomotion in a laboratory setting and performed inverse dynamics analysis to understand how this small rodent generates such impressive leaps. We combined kinematic data from video, kinetic data from a force platform, and morphometric data from dissections to calculate the relative contributions of each hindlimb muscle and tendon to the total movement...
2017: Frontiers in Zoology
https://www.readbyqxmd.com/read/28678303/a-comparison-of-discovered-regularities-in-blood-glucose-readings-across-two-data-collection-approaches-used-with-a-type-1-diabetic-youth
#19
Victor Lee, Travis Thurston, Chris Thurston
BACKGROUND: Type 1 diabetes requires frequent testing and monitoring of blood glucose levels in order to determine appropriate type and dosage of insulin administration. This can lead to thousands of individual measurements over the course of a lifetime of a single individual, of which very few are retained as part of a permanent record. The third author, aged 9, and his family have maintained several years of written records since his diagnosis with Type 1 diabetes at age 20 months, and have also recently begun to obtain automated records from a continuous glucose monitor...
July 5, 2017: Methods of Information in Medicine
https://www.readbyqxmd.com/read/28663024/comparison-and-evaluation-of-marginal-and-internal-gaps-in-cobalt-chromium-alloy-copings-fabricated-using-subtractive-and-additive-manufacturing
#20
Dong-Yeon Kim, Ji-Hwan Kim, Hae-Young Kim, Woong-Chul Kim
PURPOSE: To evaluate the marginal and internal gaps of cobalt-chromium (Co-Cr) alloy copings fabricated using subtractive and additive manufacturing. METHODS: A study model of an abutment tooth 46 was prepared by a 2-step silicone impression with dental stone. Fifteen stereolithography files for Co-Cr alloy copings were compiled using a model scanner and dental CAD software. Using the lost wax (LW), wax block (WB), soft metal block (SMB), microstereolithography (μ-SLA), and selected laser melting (SLM) techniques, 15 Co-Cr alloy copings were fabricated per group...
June 26, 2017: Journal of Prosthodontic Research
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