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https://www.readbyqxmd.com/read/28816292/-precision-of-three-dimensional-printed-brackets
#1
D Zhang, L C Wang, Y H Zhou, X M Liu, J Li
OBJECTIVE: This study was based on digital orthodontic diagnosis work flow for indirect bonding transfer tray model design and three-dimensional (3D) printing, and the aim of this paper was to inspect the dimensional accuracyof 3D printed brackets, which is the foundation of the follow up work and hoped that will illuminate the clinical application of the digital orthodontics work flow. METHODS: The samples which consisted of 14 cases of patients with malocclusion from Department of Orthodontics Peking University were selected, including 8 cases with tooth extraction and 6 cases without tooth extraction...
August 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28792965/method-to-evaluate-the-noise-of-3d-intra-oral-scanner
#2
Alban Desoutter, Osama Yusuf Solieman, Gérard Subsol, Hervé Tassery, Frédéric Cuisinier, Michel Fages
In dentistry, 3D intra-oral scanners are gaining increasing popularity essentially for the production of dental prostheses. However, there is no normalized procedure to evaluate their basic performance and enable comparisons among intra-oral scanners. The noise value highlights the trueness of a 3D intra-oral scanner and its capacity to plan prosthesis with efficient clinical precision. The aim of the present study is to develop a reproducible methodology for determining the noise of an intra-oral scanner. To this aim, and as a reference, an ultra-flat and ultra-smooth alumina wafer is used as a blank test...
2017: PloS One
https://www.readbyqxmd.com/read/28771886/alternative-method-to-evaluate-the-adaptation-of-implant-supported-multi-unit-prosthetic-frameworks
#3
Ying Zhou, Yong Li, Xiao Ma, Yiqing Huang, Jiawei Wang
PURPOSE: Various methods to evaluate the adaptation of dental prostheses are available; however, only a few of these methods assess the adaptation of the framework as a whole. This study aimed to propose an alternative method to evaluate the adaptation of implant-supported multi-unit Co-Cr alloy frameworks. MATERIALS AND METHODS: A four-unit framework supported by two implants was designed using a computer. Six dots with a diameter of 0.2 mm were designed randomly using 3Shape software on the abutment surface of the framework for measurement...
August 3, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28740969/an-in-vitro-study-comparing-the-accuracy-of-full-arch-casts-digitized-with-desktop-scanners
#4
Roxana Nowak, Christian Wesemann, Jan Robben, Jonas Muallah, Axel Bumann
OBJECTIVE: The purpose of this study was to evaluate the accuracy of full-arch scans using 11 different cast scanners. METHOD AND MATERIALS: Dental arch length (AL), intermolar width (IMW), and intercanine width (ICW) of the reference plaster casts were measured using a coordinate measuring machine (Zeiss O-Inspect 422). The master cast was subsequently scanned 37 times using 11 desktop scanners (3Shape R500, 3Shape R700, 3Shape R1000, 3Shape R2000, Medianetx grande, Medianetx colori, DentaCore CS ULTRA, Dentaurum OrthoX, Maestro 3D, Imetric IScan D104i, GC Aadva Lab Scan)...
July 20, 2017: Quintessence International
https://www.readbyqxmd.com/read/28680553/adaptation-of-zirconia-crowns-created-by-conventional-versus-optical-impression-in-vitro-study
#5
Sibel Cetik, Babak Bahrami, InÈs Fossoyeux, Ramin Atash
PURPOSE: The aim of this study was to compare the precision of optical impression (Trios, 3Shape) versus that of conventional impression (Imprint IV, 3M-ESPE) with three different margins (shoulder, chamfer, and knife-edge) on Frasaco teeth. MATERIALS AND METHODS: The sample comprised of 60 zirconia half-crowns, divided into six groups according to the type of impression and margin. Scanning electron microscopy enabled us to analyze the gap between the zirconia crowns and the Frasaco teeth, using ImageJ software, based on eight reproducible and standardized measuring points...
June 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28636642/in-vivo-evaluation-of-inter-operator-reproducibility-of-digital-dental-and-conventional-impression-techniques
#6
Emi Kamimura, Shinpei Tanaka, Masayuki Takaba, Keita Tachi, Kazuyoshi Baba
PURPOSE: The aim of this study was to evaluate and compare the inter-operator reproducibility of three-dimensional (3D) images of teeth captured by a digital impression technique to a conventional impression technique in vivo. MATERIALS AND METHODS: Twelve participants with complete natural dentition were included in this study. A digital impression of the mandibular molars of these participants was made by two operators with different levels of clinical experience, 3 or 16 years, using an intra-oral scanner (Lava COS, 3M ESPE)...
2017: PloS One
https://www.readbyqxmd.com/read/28632256/scanning-electron-microscopy-analysis-of-the-adaptation-of-single-unit-screw-retained-computer-aided-design-computer-aided-manufacture-abutments-after-mechanical-cycling
#7
Roberto Adrian Markarian, Deborah Pedroso Galles, Fabiana Mantovani Gomes França
PURPOSE: To measure the microgap between dental implants and custom abutments fabricated using different computer-aided design/computer-aided manufacture (CAD/CAM) methods before and after mechanical cycling. MATERIALS AND METHODS: CAD software (Dental System, 3Shape) was used to design a custom abutment for a single-unit, screw-retained crown compatible with a 4.1-mm external hexagon dental implant. The resulting stereolithography file was sent for manufacturing using four CAD/CAM methods (n = 40): milling and sintering of zirconium dioxide (ZO group), cobalt-chromium (Co-Cr) sintered via selective laser melting (SLM group), fully sintered machined Co-Cr alloy (MM group), and machined and sintered agglutinated Co-Cr alloy powder (AM group)...
June 20, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28630956/accuracy-of-full-arch-scans-using-intraoral-and-extraoral-scanners-an-in-vitro-study-using-a-new-method-of-evaluation
#8
Jonas Muallah, Christian Wesemann, Roxana Nowak, Jan Robben, James Mah, Peter Pospiech, Axel Bumann
The aim of this study was to compare the accuracy of six intraoral scanners as regards clinically relevant distances using a new method of evaluation. An additional objective was to compare intraoral scanners with the indirect digitization of model scanners. A resin master model was created by 3D printing and drilled in five places to reflect the following distances: intermolar width (IMW), intercanine width (ICW), and arch length (AL). To determine a gold standard, the distances were measured with a coordinate measuring instrument (Zeiss O-Inspect 422)...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28554463/accuracy-of-printed-dental-models-made-with-2-prototype-technologies-and-different-designs-of-model-bases
#9
Leonardo Tavares Camardella, Oswaldo de Vasconcellos Vilella, Hero Breuning
INTRODUCTION: The aim of this study was to compare the accuracy of printed models from intraoral scans with different designs of model bases, using 2 types of 3-dimensional printing techniques. METHODS: Three types of model base design were created: regular base, horseshoe-shaped base, and horseshoe-shaped base with a bar connecting the posterior region. The digital models were printed with the 3-dimensional printers using different techniques: stereolithography and triple jetting technology (polyjet)...
June 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28302948/the-accuracy-of-the-cad-system-using-intraoral-and-extraoral-scanners-for-designing-of-fixed-dental-prostheses
#10
Sakura Shimizu, Akikazu Shinya, Soichi Kuroda, Harunori Gomi
The accuracy of prostheses affects clinical success and is, in turn, affected by the accuracy of the scanner and CAD programs. Thus, their accuracy is important. The first aim of this study was to evaluate the accuracy of an intraoral scanner with active triangulation (Cerec Omnicam), an intraoral scanner with a confocal laser (3Shape Trios), and an extraoral scanner with active triangulation (D810). The second aim of this study was to compare the accuracy of the digital crowns designed with two different scanner/CAD combinations...
July 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28289894/the-effect-of-low-level-laser-therapy-on-tooth-movement-during-canine-distalization
#11
RANDOMIZED CONTROLLED TRIAL
Sevin Erol Üretürk, Müyesser Saraç, Sönmez Fıratlı, Şule Batu Can, Yegane Güven, Erhan Fıratlı
The aim of the study is to determine the effects of low level laser therapy on tooth movement during canine distalization by evaluating IL-1β, TGF-β1 levels in gingival crevicular fluid. Maxillary first premolars of the 15 Angle Class II division I patients (12-19 years old) were extracted. Right maxillary canines were distalized by standard protocol as control group whereas the left maxillary canines distalized by laser application. A gallium-aluminum-arsenide diode laser with an output power of 20 mW was applied as five doses from the buccal and the palatal side on the day 0, and the 3rd, 7th, 14th, 21th 30th, 33st, 37th, 60th, 63th, and 67th days...
May 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28072686/design-and-fabrication-of-complete-dentures-using-cad-cam-technology
#12
Weili Han, Yanfeng Li, Yue Zhang, Yuan Lv, Ying Zhang, Ping Hu, Huanyue Liu, Zheng Ma, Yi Shen
The aim of the study was to test the feasibility of using commercially available computer-aided design and computer-aided manufacturing (CAD/CAM) technology including 3Shape Dental System 2013 trial version, WIELAND V2.0.049 and WIELAND ZENOTEC T1 milling machine to design and fabricate complete dentures.The modeling process of full denture available in the trial version of 3Shape Dental System 2013 was used to design virtual complete dentures on the basis of 3-dimensional (3D) digital edentulous models generated from the physical models...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28024822/evaluation-of-the-accuracy-of-7-digital-scanners-an-in%C3%A2-vitro-analysis-based-on-3-dimensional-comparisons
#13
Walter Renne, Mark Ludlow, John Fryml, Zach Schurch, Anthony Mennito, Ray Kessler, Abigail Lauer
STATEMENT OF PROBLEM: As digital impressions become more common and more digital impression systems are released onto the market, it is essential to systematically and objectively evaluate their accuracy. PURPOSE: The purpose of this in vitro study was to evaluate and compare the trueness and precision of 6 intraoral scanners and 1 laboratory scanner in both sextant and complete-arch scenarios. Furthermore, time of scanning was evaluated and correlated with trueness and precision...
December 23, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27876722/-comparative-analysis-of-3d-data-visibility-of-the-prepared-tooth-finishing-line-on-a-synthetic-jaw-model-captured-by-international-scanners-in-a-laboratory-conditions
#14
COMPARATIVE STUDY
A N Ryakhovsky, V V Kostyukova
The aim of the study was to compare accuracy of digital impression's finishing line and the zone under it taken by different intraoral scanning systems. Parameters of comparison were: different level of the finishing line to the gingiva and width of sulcus after retraction. For this purpose two synthetic jaw models with prepared teeth were scanned using intraoral scanning systems: 3D Progress (MHT S.P.A., IT - MHT Optic Research AG, CH); True Definition (3M ESPE, USA); Trios (3Shape A/S, DNK); CEREC AC Bluecam, CEREC Omnicam (Sirona Dental System GmbH, DE); Planscan (Planmeca, FIN) (each n=10)...
2016: Stomatologii︠a︡
https://www.readbyqxmd.com/read/27870167/design-of-complete-dentures-by-adopting-cad-developed-for-fixed-prostheses
#15
Yanfeng Li, Weili Han, Jing Cao, Yuan Iv, Yue Zhang, Yishi Han, Yi Shen, Zheng Ma, Huanyue Liu
The demand for complete dentures is expected to increase worldwide, but complete dentures are mainly designed and fabricated manually involving a broad series of clinical and laboratory procedures. Therefore, the quality of complete dentures largely depends on the skills of the dentist and technician, leading to difficulty in quality control. Computer-aided design and manufacturing (CAD/CAM) has been used to design and fabricate various dental restorations including dental inlays, veneers, crowns, partial crowns, and fixed partial dentures (FPDs)...
November 21, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27834416/accuracy-and-efficiency-of-full-arch-digitalization-and-3d-printing-a-comparison-between-desktop-model-scanners-an-intraoral-scanner-a-cbct-model-scan-and-stereolithographic-3d-printing
#16
Christian Wesemann, Jonas Muallah, James Mah, Axel Bumann
OBJECTIVE: The primary objective of this study was to compare the accuracy and time efficiency of an indirect and direct digitalization workflow with that of a three-dimensional (3D) printer in order to identify the most suitable method for orthodontic use. METHOD AND MATERIALS: A master model was measured with a coordinate measuring instrument. The distances measured were the intercanine width, the intermolar width, and the dental arch length. Sixty-four scans were taken with each of the desktop scanners R900 and R700 (3Shape), the intraoral scanner TRIOS Color Pod (3Shape), and the Promax 3D Mid cone beam computed tomography (CBCT) unit (Planmeca)...
November 10, 2016: Quintessence International
https://www.readbyqxmd.com/read/27771189/evaluation-of-the-accuracy-of-extraoral-laboratory-scanners-with-a-single-tooth-abutment-model-a-3d-analysis
#17
Federico Mandelli, Enrico Gherlone, Giorgio Gastaldi, Marco Ferrari
PURPOSE: The aim of this study was to compare the accuracy of different laboratory scanners using a calibrated coordinate measuring machine as reference. METHODS: A sand blasted titanium reference model (RM) was scanned with an industrial 3D scanner in order to obtain a reference digital model (dRM) that was saved in the standard tessellation format (.stl). RM was scanned ten times with each one of the tested scanners (GC Europe Aadva, Zfx Evolution, 3Shape D640, 3Shape D700, NobilMetal Sinergia, EGS DScan3, Open Technologies Concept Scan Top) and all the scans were exported in ...
October 19, 2016: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/27737366/marginal-and-internal-fit-of-zirconia-copings-obtained-using-different-digital-scanning-methods
#18
Lorena Oliveira Pedroche, Sérgio Rocha Bernardes, Moira Pedroso Leão, Cibele Cândida de Almeida Kintopp, Gisele Maria Correr, Bárbara Pick Ornaghi, Carla Castiglia Gonzaga
The objective of this study was to evaluate the marginal and internal fit of zirconia copings obtained with different digital scanning methods. A human mandibular first molar was set in a typodont with its adjacent and antagonist teeth and prepared for an all-ceramic crown. Digital impressions were made using an intraoral scanner (3Shape). Polyvinyl siloxane impressions and Type IV gypsum models were also obtained and scanned with a benchtop laboratory scanner (3Shape D700). Ten zirconia copings were fabricated for each group using CAD-CAM technology...
October 10, 2016: Brazilian Oral Research
https://www.readbyqxmd.com/read/27636766/comparative-analysis-of-3d-data-accuracy-of-single-tooth-and-full-dental-arch-captured-by-different-intraoral-and-laboratory-digital-impression-systems
#19
COMPARATIVE STUDY
A N Ryakhovskiy, V V Kostyukova
The aim of this study was to compare the accuracy of digital impressions taken by different intraoral and laboratory scanners. For this purpose a synthetic jaw model with prepared tooth was scanned using intraoral scanning systems: 3D Progress (MHT S.P.A., IT - MHT Optic Research AG, CH); True Definition (3M ESPE, USA); Trios (3Shape A/S, DNK); CEREC AC Bluecam, CEREC Omnicam (Sirona Dental System GmbH, DE); Planscan (Planmeca, FIN); and laboratory scanning systems: s600 ARTI (Zirkonzahn GmbH, IT); Imetric Iscan D104, CH); D900 (3Shape A/S, DNK); Zfx Evolution (Zfx GmbH, DE) (each n=10)...
2016: Stomatologii︠a︡
https://www.readbyqxmd.com/read/27598906/dimensional-changes-of-dental-arches-produced-by-fixed-and-removable-palatal-cribs-a-prospective-randomized-controlled-study
#20
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...
March 2017: Angle Orthodontist
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