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https://www.readbyqxmd.com/read/28424734/influence-of-teeth-preparation-finishing-on-the-adaptation-of-lithium-disilicate-crowns
#1
Bruna Salamoni Sinhori, Mauro Amaral Caldeira de Andrada, Guilherme Carpena Lopes, Sylvio Monteiro Junior, Luiz Narciso Baratieri
The polishing step of teeth preparations for crowns is a step often performed, so that there is an increased time during the clinical procedure. The aim of this study is to evaluate the marginal and internal adaptation of all-ceramic CAD/CAM lithium disilicate crowns in polished preparations for crown and nonpolished preparations for crowns. For this purpose, 20 first molars were selected, which were divided into two groups (n = 10) G1, teeth that received surface roughening similar to preparation without polishing, and G2 (control), polished preparations...
2017: International Journal of Biomaterials
https://www.readbyqxmd.com/read/28422359/clinical-evaluation-of-indirect-particle-filled-composite-resin-cad-cam-partial-crowns-after-24-months
#2
Moritz Zimmermann, Christina Koller, Marcel Reymus, Albert Mehl, Reinhard Hickel
PURPOSE: Resin-based CAD/CAM compound materials might be promising for single-tooth restorations. Insufficient clinical data are available for this new material class. The purpose of this study was to describe initial clinical in vivo results for indirect particle-filled composite resin CAD/CAM restorations after 24 months. MATERIALS AND METHODS: Indirect particle-filled composite resin restorations were fabricated with a CAD/CAM method (CEREC Bluecam intraoral scanner, CEREC MCXL milling unit) by calibrated dental students...
April 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28402732/different-methods-for-inlay-production-effect-on-internal-and-marginal-adaptation-adjustment-time-and-contact-point
#3
M P Rippe, C Monaco, L Volpe, M A Bottino, R Scotti, L F Valandro
The aim of this study was to evaluate the effect of different production methods of resin and ceramic inlays on marginal and internal adaptation, adjustment time, and proximal contacts. Forty premolars were selected, embedded (their roots), and prepared to receive inlays that were made as follows (n=10): LaRe-digital impression with a Lava C.O.S. scanner, followed by milling of Lava Ultimate block (composite resin) in a milling center; CeRe-digital impression with a Cerec 3D Bluecam scanner, followed by milling of Lava Ultimate block in Cerec; CeDis-digital impression with a Cerec 3D Bluecam scanner, followed by milling of IPS e...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28385434/computer-aided-analysis-of-digital-dental-impressions-obtained-from-intraoral-and-extraoral-scanners
#4
Lauren Oliveira Lima Bohner, Graziela De Luca Canto, Bruno Silva Marció, Dalva Cruz Laganá, Newton Sesma, Pedro Tortamano Neto
STATEMENT OF PROBLEM: The internal and marginal adaptation of a computer-aided design and computer-aided manufacturing (CAD-CAM) prosthesis relies on the quality of the 3-dimensional image. The quality of imaging systems requires evaluation. PURPOSE: The purpose of this in vitro study was to evaluate and compare the trueness of intraoral and extraoral scanners in scanning-prepared teeth. MATERIAL AND METHODS: Ten acrylic resin teeth to be used as a reference dataset were prepared according to standard guidelines and scanned with an industrial computed tomography system...
April 3, 2017: Journal of Prosthetic Dentistry
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
#5
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
#6
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/27703611/are-different-generations-of-cad-cam-milling-machines-capable-to-produce-restorations-with-similar-quality
#7
Renato Roperto, Hussein Assaf, Thiago Soares-Porto, Lisa Lang, Sorin Teich
BACKGROUND: Different CAD/CAM machines' generation may impact the restoration overall quality. The present study evaluated the marginal fit of CAD/CAM restorations manufactured with different generations of CEREC milling unit systems. MATERIAL AND METHODS: Sixteen typodont teeth were divided into two groups (n=8) according to the machine's generation assigned. These are control group (G1): Cerec AC with Bluecam/Cerec 3 milling unit and (G2): Cerec AC with Bluecam/MC XL Premium Package milling unit...
October 2016: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/27677214/marginal-and-internal-fit-of-cad-cam-fabricated-composite-resin-and-ceramic-crowns-scanned-by-2-intraoral-cameras
#8
Alessandra C de Paula Silveira, Sacha B Chaves, Leandro A Hilgert, Ana Paula D Ribeiro
STATEMENT OF PROBLEM: The precision of fit of chairside computer-aided design and computer-aided manufacturing (CAD-CAM) complete crowns is affected by digital impression and restorative material. PURPOSE: The purpose of this in vitro study was to evaluate by microcomputed tomography (μCT) the marginal and internal adaptation of composite resin and ceramic complete crowns fabricated with 2 different intraoral cameras and 2 restorative materials. MATERIAL AND METHODS: Ten extracted human third molars received crown preparations...
September 24, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27666500/accuracy-of-single-abutment-digital-cast-obtained-using-intraoral-and-cast-scanners
#9
Jae-Jun Lee, Ii-Do Jeong, Jin-Young Park, Jin-Hun Jeon, Ji-Hwan Kim, Woong-Chul Kim
STATEMENT OF PROBLEM: Scanners are frequently used in the fabrication of dental prostheses. However, the accuracy of these scanners is variable, and little information is available. PURPOSE: The purpose of this in vitro study was to compare the accuracy of cast scanners with that of intraoral scanners by using different image impression techniques. MATERIAL AND METHODS: A poly(methyl methacrylate) master model was fabricated to replicate a maxillary first molar single-abutment tooth model...
February 2017: Journal of Prosthetic Dentistry
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
#10
COMPARATIVE STUDY
A N Ryakhovsky, 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/27460321/randomized-controlled-within-subject-evaluation-of-digital-and-conventional-workflows-for-the-fabrication-of-lithium-disilicate-single-crowns-part-i-digital-versus-conventional-unilateral-impressions
#11
Goran I Benic, Sven Mühlemann, Vincent Fehmer, Christoph H F Hämmerle, Irena Sailer
STATEMENT OF PROBLEM: Trials comparing the overall performance of fully digital and conventional workflows in reconstructive dentistry are needed. PURPOSE: The purpose of the first part of this randomized controlled clinical trial was to determine whether optical impressions produce different results from conventional impressions with respect to time efficiency and patient and operator perceptions of the clinical workflow. MATERIAL AND METHODS: Three digital impressions and 1 conventional impression were made in each of 10 participants according to a randomly generated sequence...
November 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27406138/accuracy-of-five-intraoral-scanners-compared-to-indirect-digitalization
#12
Jan-Frederik Güth, Cornelius Runkel, Florian Beuer, Michael Stimmelmayr, Daniel Edelhoff, Christine Keul
OBJECTIVES: Direct and indirect digitalization offer two options for computer-aided design (CAD)/ computer-aided manufacturing (CAM)-generated restorations. The aim of this study was to evaluate the accuracy of different intraoral scanners and compare them to the process of indirect digitalization. MATERIAL AND METHOD: A titanium testing model was directly digitized 12 times with each intraoral scanner: (1) CS 3500 (CS), (2) Zfx Intrascan (ZFX), (3) CEREC AC Bluecam (BLU), (4) CEREC AC Omnicam (OC) and (5) True Definition (TD)...
July 12, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/26929955/analysis-of-vertical-marginal-adaptation-of-zirconia-fixed-dental-prosthesis-frameworks-fabricated-by-the-cad-cam-system-a-randomized-double-blind-study
#13
RANDOMIZED CONTROLLED TRIAL
Caroline Mello, Joel Ferraro Santiago Junior, Graziela Galhano, Jose Vitor Quinelli Mazaro, Roberto Scotti, Eduardo Pellizzer
PURPOSE: The purpose of this study was to evaluate the marginal adaptation of fixed dental prosthesis frameworks fabricated by computer-aided design/computer-assisted manufacture (CAD/CAM) with three different systems of data acquisition. MATERIALS AND METHODS: A total of 50 specimens were fabricated as follows: using the conventional method (Ni-Cr) (n=10); iTero/industrial milling (Group 1, n=10); Cerec Bluecam/industrial milling (Group 2, n=10); 3S/industrial milling (Group 3, n=10); and Cerec BlueCam/Sirona milling (Group 4, n=10)...
March 2016: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/26794703/accuracy-of-complete-arch-model-using-an-intraoral-video%C3%A2-scanner-an-in%C3%A2-vitro-study
#14
Il-Do Jeong, Jae-Jun Lee, Jin-Hun Jeon, Ji-Hwan Kim, Hae-Young Kim, Woong-Chul Kim
STATEMENT OF PROBLEM: Information on the accuracy of intraoral video scanners for long-span areas is limited. PURPOSE: The purpose of this in vitro study was to evaluate and compare the trueness and precision of an intraoral video scanner, an intraoral still image scanner, and a blue-light scanner for the production of digital impressions. MATERIAL AND METHODS: Reference scan data were obtained by scanning a complete-arch model. An identical model was scanned 8 times using an intraoral video scanner (CEREC Omnicam; Sirona) and an intraoral still image scanner (CEREC Bluecam; Sirona), and stone casts made from conventional impressions of the same model were scanned 8 times with a blue-light scanner as a control (Identica Blue; Medit)...
June 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/26548890/in-vivo-precision-of-conventional-and-digital-methods-of-obtaining-complete-arch-dental-impressions
#15
Andreas Ender, Thomas Attin, Albert Mehl
STATEMENT OF PROBLEM: Digital impression systems have undergone significant development in recent years, but few studies have investigated the accuracy of the technique in vivo, particularly compared with conventional impression techniques. PURPOSE: The purpose of this in vivo study was to investigate the precision of conventional and digital methods for complete-arch impressions. MATERIAL AND METHODS: Complete-arch impressions were obtained using 5 conventional (polyether, POE; vinylsiloxanether, VSE; direct scannable vinylsiloxanether, VSES; digitized scannable vinylsiloxanether, VSES-D; and irreversible hydrocolloid, ALG) and 7 digital (CEREC Bluecam, CER; CEREC Omnicam, OC; Cadent iTero, ITE; Lava COS, LAV; Lava True Definition Scanner, T-Def; 3Shape Trios, TRI; and 3Shape Trios Color, TRC) techniques...
March 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/26547869/in-vivo-precision-of-conventional-and-digital-methods-for-obtaining-quadrant-dental-impressions
#16
Andreas Ender, Moritz Zimmermann, Thomas Attin, Albert Mehl
OBJECTIVES: Quadrant impressions are commonly used as alternative to full-arch impressions. Digital impression systems provide the ability to take these impressions very quickly; however, few studies have investigated the accuracy of the technique in vivo. The aim of this study is to assess the precision of digital quadrant impressions in vivo in comparison to conventional impression techniques. MATERIALS AND METHODS: Impressions were obtained via two conventional (metal full-arch tray, CI, and triple tray, T-Tray) and seven digital impression systems (Lava True Definition Scanner, T-Def; Lava Chairside Oral Scanner, COS; Cadent iTero, ITE; 3Shape Trios, TRI; 3Shape Trios Color, TRC; CEREC Bluecam, Software 4...
September 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/26159383/clinical-performance-of-cerec-ac-bluecam-conservative-ceramic-restorations-after-five-years-a-retrospective-study
#17
Farahnaz Nejatidanesh, Mehrak Amjadi, Mohadese Akouchekian, Omid Savabi
OBJECTIVES: The aim of this study was to assess the clinical performance of CAD/CAM partial coverage posterior restorations made by CEREC AC Bluecam system after 5 years. METHODS: 159 ceramic partial coverage posterior restorations were placed in 109 patients in a private practice. The restorations were made using CEREC AC Bluecam with CEREC Blocs or Empress CAD blocks. The clinical performance of the restorations was evaluated with modified California Dental Association (CDA) guidelines, gingival and plaque indices, probing pocket depth, and bleeding on probing in a period of 5 years...
September 2015: Journal of Dentistry
https://www.readbyqxmd.com/read/26057777/accuracy-of-a-digital-impression-system-based-on-active-triangulation-technology-with-blue-light-for-implants-effect-of-clinically-relevant-parameters
#18
Beatriz Giménez, Mutlu Özcan, Francisco Martínez-Rus, Guillermo Pradíes
PURPOSE: To evaluate the accuracy of a digital impression system considering clinical parameters. MATERIALS AND METHODS: A master model with 6 implants (27, 25, 22, 12, 15, and 17) was fitted with polyether ether ketone scan bodies. Implant no. 25 was placed with 30° mesial angulation and no. 15 with 30° distal angulation in relation to the vertical plane (y axis). Implant no. 22 was placed at 2 mm and no. 12 placed 4 mm below the gingiva. Experienced (n = 2) and inexperienced (n = 2) operators performed the scanning (CEREC system)...
October 2015: Implant Dentistry
https://www.readbyqxmd.com/read/25359645/accuracy-of-computer-aided-design-computer-aided-manufacturing-generated-dental-casts-based-on-intraoral-scanner-data
#19
Sebastian B M Patzelt, Shaza Bishti, Susanne Stampf, Wael Att
BACKGROUND: Little is known about the accuracy of physical dental casts that are based on three-dimensional (3D) data from an intraoral scanner (IOS). Thus, the authors conducted a study to evaluate the accuracy of full-arch stereolithographic (SLA) and milled casts obtained from scans of three IOSs. METHODS: The authors digitized a polyurethane model using a laboratory reference scanner and three IOSs. They sent the scans (n = five scans per IOS) to the manufacturers to produce five physical dental casts and scanned the casts with the reference scanner...
November 2014: Journal of the American Dental Association
https://www.readbyqxmd.com/read/25134995/scanning-accuracy-and-precision-in-4-intraoral-scanners-an-in-vitro-comparison-based-on-3-dimensional-analysis
#20
COMPARATIVE STUDY
Robert G Nedelcu, Anna S K Persson
STATEMENT OF PROBLEM: Intraoral scanners may use proprietary acquisition and manufacturing processes. However, limited information is available regarding their accuracy, their precision, and the influence that refraction or coating may have on their output. PURPOSE: The purpose of the study was to evaluate the scanning accuracy and precision of 4 intraoral scanners and to assess the influence of different test materials and coating thicknesses. MATERIAL AND METHODS: Models were fabricated in 3 materials (polymethyl methacrylate [Telio CAD], titanium, and zirconia) and reference scanned with an industrial optical scanner...
December 2014: Journal of Prosthetic Dentistry
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