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https://www.readbyqxmd.com/read/29657537/analysis-of-vertical-marginal-discrepancy-in-feldspathic-porcelain-crowns-manufactured-with-different-cad-cam-systems-closed-and-open
#1
Fabio Kricheldorf, Cleuber Rodrigo de Souza Bueno, Wilson da Silva Amaral, Joel Ferreira Santiago Junior, Hugo Nary Filho
Objective: The objective of this study is to compare the marginal adaptation of feldspathic porcelain crowns using two computer-aided design/computer-aided manufacturing systems, one of them is open and the other is closed. Materials and Methods: Twenty identical titanium abutments were divided into two groups: open system (OS), where ceramic crowns were created using varied equipment and software, and closed system (CS), where ceramic crowns were created using the CEREC system...
January 2018: European Journal of Dentistry
https://www.readbyqxmd.com/read/29627209/digital-evaluation-of-absolute-marginal-discrepancy-a-comparison-of-ceramic-crowns-fabricated-with-conventional-and-digital-techniques
#2
Shanshan Liang, Fusong Yuan, Xu Luo, Zhuoren Yu, Zhihui Tang
STATEMENT OF PROBLEM: Marginal discrepancy is key to evaluating the accuracy of fixed dental prostheses. An improved method of evaluating marginal discrepancy is needed. PURPOSE: The purpose of this in vitro study was to evaluate the absolute marginal discrepancy of ceramic crowns fabricated using conventional and digital methods with a digital method for the quantitative evaluation of absolute marginal discrepancy. The novel method was based on 3-dimensional scanning, iterative closest point registration techniques, and reverse engineering theory...
April 5, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29624626/effect-of-software-version-on-the-accuracy-of-an-intraoral-scanning-device
#3
Yasser Haddadi, Golnosh Bahrami, Flemming Isidor
PURPOSE: To investigate the impact of software version on the accuracy of an intraoral scanning device. MATERIALS AND METHODS: A master tooth was scanned with a high-precision optical scanner and then 10 times with a CEREC Omnicam scanner with software versions 4.4.0 and 4.4.4. Discrepancies were measured using quality control software. RESULTS: Mean deviation for 4.4.0 was 36.2 ± 35 μm and for 4.4.4 was 20.7 ± 14.2 μm (P ≤ .001). CONCLUSION: Software version has a significant impact on the accuracy of an intraoral scanner...
April 6, 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29607851/evaluation-of-the-fracture-resistance-of-computer-aided-design-computer-aided-manufacturing-monolithic-crowns-prepared-in-different-cement-thicknesses
#4
N Polat Sagsoz, N Yanıkoglu
Introduction: The purpose of this study was to evaluate the fracture resistance of monolithic computer-aided design/computer-aided manufacturing (CAD/CAM) crowns that are prepared with different cement thickness. Materials and Methods: For this investigation, a human maxillary premolar tooth was selected. Master model preparation was performed with a demand bur under water spray. Master die was taken to fabricate 105 epoxy resin replicas. The crowns were milled using a CEREC 4 CAD/CAM system (Software Version, 4...
April 2018: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29576569/use-of-digital-impression-systems-with-intraoral-scanners-for-fabricating-restorations-and-fixed-dental-prostheses
#5
Yoshimasa Takeuchi, Hiroyasu Koizumi, Mika Furuchi, Yohei Sato, Chikahiro Ohkubo, Hideo Matsumura
Accurate impressions are essential in fabri-cating dental restorations and fixed dental prostheses. During the last decade, digital impression systems have improved substantially. This review discusses the accuracy of digital impression systems for fabrication of dental restorations and fixed dental prostheses. A literature search in PubMed was performed for the period from July 2010 through June 2017. The search keywords were Cerec, digital impression, direct digitalization, indirect digitalization, and intraoral scanner...
2018: Journal of Oral Science
https://www.readbyqxmd.com/read/29575669/comparison-of-a-prepcheck-supported-self-assessment-concept-with-conventional-faculty-supervision-in-a-pre-clinical-simulation-environment
#6
M Wolgin, S Grabowski, S Elhadad, W Frank, A M Kielbassa
OBJECTIVES: This study aimed to evaluate the educational outcome of a digitally based self-assessment concept (prepCheck; DentsplySirona, Wals, Austria) for pre-clinical undergraduates in the context of a regular phantom-laboratory course. MATERIALS AND METHODS: A sample of 47 third-year dental students participated in the course. Students were randomly divided into a prepCheck-supervised (self-assessment) intervention group (IG; n = 24); conventionally supervised students constituted the control group (CG; n = 23)...
March 25, 2018: European Journal of Dental Education: Official Journal of the Association for Dental Education in Europe
https://www.readbyqxmd.com/read/29551386/marginal-adaptation-of-cad-cam-onlays-influence-of-preparation-design-and-impression-technique
#7
Fernanda Ferruzzi Lima, Constantino Fernandes Neto, José H Rubo, Gildo Coelho Santos, Maria Jacinta Moraes Coelho Santos
STATEMENT OF PROBLEM: Factors that may affect the marginal adaptation of computer-aided design and computer-aided manufacturing (CAD-CAM) restorations include preparation design, impression technique, and CAD-CAM system. The influence of impression technique and preparation design on CAD-CAM partial coverage restorations has not been fully addressed. PURPOSE: The purpose of this in vitro study was to investigate the influence of direct and indirect digital impression techniques and 2 preparation designs on the marginal adaptation of CAD-CAM onlays...
March 15, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29519990/-in-vitro-fracture-strength-and-hardness-of-different-computer-aided-design-computer-aided-manufacturing-inlays
#8
O Sagsoz, M Yildiz, A S L Hojjat Ghahramanzadeh, A Alsaran
Objective: The purpose of this study was to examine the fracture strength and surface microhardness of computer-aided design/computer-aided manufacturing (CAD/CAM) materials in vitro. Materials and Methods: Mesial-occlusal-distal inlays were made from five different CAD/CAM materials (feldspathic ceramic, CEREC blocs; leucite-reinforced ceramic, IPS Empress CAD; resin nano ceramic, 3M ESPE Lava Ultimate; hybrid ceramic, VITA Enamic; and lithium disilicate ceramic, IPS e...
March 2018: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29518805/comparison-of-accuracy-between-a-conventional-and-two-digital-intraoral-impression-techniques
#9
Junaid Malik, Jose Rodriguez, Michael Weisbloom, Haralampos Petridis
PURPOSE: To compare the accuracy (ie, precision and trueness) of full-arch impressions fabricated using either a conventional polyvinyl siloxane (PVS) material or one of two intraoral optical scanners. MATERIALS AND METHODS: Full-arch impressions of a reference model were obtained using addition silicone impression material (Aquasil Ultra; Dentsply Caulk) and two optical scanners (Trios, 3Shape, and CEREC Omnicam, Sirona). Surface matching software (Geomagic Control, 3D Systems) was used to superimpose the scans within groups to determine the mean deviations in precision and trueness (μm) between the scans, which were calculated for each group and compared statistically using one-way analysis of variance with post hoc Bonferroni (trueness) and Games-Howell (precision) tests (IBM SPSS ver 24, IBM UK)...
March 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29508488/three-dimensional-digital-evaluation-of-the-fit-of-endocrowns-fabricated-from-different-cad-cam-materials
#10
Moritz Zimmermann, Andre Valcanaia, Gisele Neiva, Albert Mehl, Dennis Fasbinder
PURPOSE: A wide variety of CAD/CAM materials are available for single-tooth restorations. CAD/CAM material characteristics are different and may influence CAM fabrication accuracy. There is no study investigating the influence of different CAD/CAM materials on the final fit of the restoration. The aim of this study was to evaluate the fit of endocrowns fabricated from different CAD/CAM materials using a new 3D evaluation method with an intraoral scanning system. The null hypothesis was that there are no significant differences for the fitting accuracy of different CAD/CAM materials...
March 6, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29476599/evaluation-of-the-effect-scan-pattern-has-on-the-trueness-and-precision-of-six-intraoral-digital-impression-systems
#11
Anthony S Mennito, Zachary P Evans, Mark E Ludlow, Walter G Renne
OBJECTIVE: Clinicians have been slow to adopt digital impression technologies due possibly to perceived technique sensitivities involved in data acquisition. This research has two aims: determine whether scan pattern and sequence affects the accuracy of the three-dimensional (3D) model created from this digital impression and to compare the 5 imaging systems with regards to their scanning accuracy for sextant impressions. MATERIALS AND METHODS: Six digital intraoral impression systems were used to scan a typodont sextant with optical properties similar to natural teeth...
February 24, 2018: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29457311/bicuspid-axial-wall-height-effect-on-cad-cam-crown-fracture-mode-on-preparations-containing-advanced-total-occlusal-convergence
#12
Matthew Miller, Nicholas DuVall, John Brewster, Michael N Wajdowicz, Ashley Harris, Howard W Roberts
PURPOSE: To evaluate bicuspid axial wall height effect on the fracture mode of adhesively luted, all-ceramic CAD/CAM crowns with a 20° total occlusal convergence (TOC). MATERIALS AND METHODS: Recently extracted premolars were randomly divided into 4 groups (n = 12) with all-ceramic crown preparations accomplished using a high-speed handpiece inserted into a milling device. Specimens were prepared containing occlusogingival axial wall heights of 3, 2, and 1 mm as well as a group containing a flat preparation surface with no axial wall height...
February 18, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29388790/use-of-cad-cam-in-second-stage-implant-surgery-to-achieve-improved-final-restoration-esthetics-natural-gingival-appearance
#13
David Dano, Lila Khalid, Eihab Mously, Russell Giordano
To achieve a predictable esthetic outcome when using an implant-supported crown for rehabilitation of an edentulous space, computer-aided design/computer-aided manufacturing (CAD/CAM) technology can be utilized in the second stage of implant surgery to scan, mill, and restore the implant site all in one office visit. In this case report, an implant for a first molar was restored with a CAM-fabricated hybrid ceramic crown, designed using CEREC® 4.4 software. A 3-dimensional scan was taken chairside at the time of uncovering the implant using powder-free intraoral scanning...
February 2018: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/29379903/cad-cam-based-chairside-restorative-technique-with-composite-resin-for-full-mouth-adhesive-rehabilitation-of-excessively-worn-dentition
#14
Filippo Del Curto, Carlo Massimo Saratti, Ivo Krejci
Since the first introduction of the Cerec system (Sirona) in the early 1980s, the use of computer-aided design/computer-aided manufacture (CAD/CAM) technology has spread widely in modern adhesive dentistry. Thanks to this innovative technology, it has been possible to carry out chairside restorations fully managed by the clinician, with the advantages of lower costs for the patient, more rapid execution of the restorations, and the exclusion of the provisional phase. With further improvements in chairside technologies and materials, specifically in the field of composite resin blocks, it is now possible to fabricate multiple ultrathin, minimally invasive or even noninvasive restorations in one single appointment...
2018: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/29246490/accuracy-and-precision-of-3-intraoral-scanners-and-accuracy-of-conventional-impressions-a-novel-in-vivo-analysis-method
#15
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)...
February 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29214376/polymer-infiltrated-ceramic-cad-cam-inlays-and-partial-coverage-restorations-3-year-results-of-a-prospective-clinical-study-over-5-years
#16
F A Spitznagel, K J Scholz, J R Strub, K Vach, P C Gierthmuehlen
OBJECTIVE: The aim of this prospective clinical 5-year study was to evaluate the long-term behavior of monolithic computer-aided design and computer-aided manufacturing (CAD/CAM)-fabricated minimally invasive polymer-infiltrated ceramic network (PICN) inlays and partial coverage restorations (PCR). MATERIAL AND METHODS: Posterior teeth of 47 patients were restored with 103 restorations (45 inlays, 58 PCRs). After defect-oriented preparations, monolithic PICN restorations of VITA Enamic were fabricated with a CAD/CAM system (inEoS blue/CEREC inLab MCXL) and adhesively bonded (Variolink II)...
December 6, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29192293/digital-evaluation-of-the-fit-of-zirconia-reinforced-lithium-silicate-crowns-with-a-new-three-dimensional-approach
#17
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/29160904/three-dimensional-accuracy-of-digital-static-interocclusal-registration-by-three-intraoral-scanner-systems
#18
Kuan Yee Wong, Roxanna Jean Esguerra, Vanessa Ai Ping Chia, Ying Han Tan, Keson Beng Choon Tan
PURPOSE: Prior studies have defined the accuracy of intraoral scanner (IOS) systems but the accuracy of the digital static interocclusal registration function of these systems has not been reported. This study compared the three-dimensional (3D) accuracy of the digital static interocclusal registration of 3 IOS systems using the buccal bite scan function. MATERIALS AND METHODS: Three IOS systems compared were 3MTM True Definition Scanner (TDS), TRIOS Color (TRC), and CEREC AC with CEREC Omnicam (CER)...
November 21, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29143397/marginal-fit-comparison-of-cad-cam-crowns-milled-from-two-different-materials
#19
Atousa Azarbal, Mohsen Azarbal, Robert L Engelmeier, Thomas C Kunkel
PURPOSE: To evaluate the marginal fit of CAD/CAM copings milled from hybrid ceramic (Vita Enamic) blocks and lithium disilicate (IPS e.max CAD) blocks, and to evaluate the effect of crystallization firing on the marginal fit of lithium disilicate copings. MATERIALS AND METHODS: A standardized metal die with a 1-mm-wide shoulder finish line was imaged using the CEREC AC Bluecam. The coping was designed using CEREC 3 software. The design was used to fabricate 15 lithium disilicate and 15 hybrid ceramic copings...
November 16, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28891600/the-effect-of-milling-and-postmilling-procedures-on-the-surface-roughness-of-cad-cam-materials
#20
Eduardo Gonçalves Mota, Laura Nunes Smidt, Lisiane Martins Fracasso, Luiz Henrique Burnett, Ana Maria Spohr
PURPOSE: The aim of this study was to evaluate the surface roughness and analyze the surface topography of five different CAD/CAM ceramics and one CAD/CAM composite resin for CEREC after milling and postmilling procedures. MATERIALS AND METHODS: Blocks of the ceramics Mark II, IPS Empress CAD, IPS e.max CAD, Suprinity and Enamic, and blocks of the composite resin Lava Ultimate were milled at CEREC MCXL. Ten flat samples of each material were obtained. The surface roughness (Ra) test was performed before and after milling, crystallization, polishing, and glaze when indicated, followed by SEM and AFM analysis...
November 12, 2017: Journal of Esthetic and Restorative Dentistry
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