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https://www.readbyqxmd.com/read/29777736/edge-strength-of-cad-cam-materials
#1
Maria Pfeilschifter, Verena Preis, Michael Behr, Martin Rosentritt
OBJECTIVES: To investigate the edge force of CAD/CAM materials as a function of (a) material, (b) thickness, and (c) distance from the margin. METHODS: Materials intended for processing with CAD/CAM were investigated: eight resin composites, one resin-infiltrated ceramic, and a clinically proven lithiumdisilicate ceramic (reference). To measure edge force (that is, load to failure/crack), plates (d = 1 mm) were fixed and loaded with a Vickers diamond indenter (1 mm/min, Zwick 1446) at a distance of 0...
May 16, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29775437/digital-microscopic-evaluation-of-vertical-marginal-discrepancies-of-cad-cam-fabricated-zirconia-cores
#2
Syed Rashid Habib
OBJECTIVE: The aim of this in vitro research study was to evaluate the vertical marginal discrepancies of zirconia (Zr) cores fabricated by five different computer-aided design and manufacturing (CAD/CAM) systems using a digital microscope. MATERIALS AND METHODS: A total of 60 specimens were prepared and randomly divided into five groups (n=12 each) using the following systems: Ceramill Motion 2 (CM, Amanngirrbach, Germany); Weiland (WI, Ivoclar Vivadent, USA); Cerec (CS, Sirona Dental, USA); Zirkonzahn (ZZ, Gmbh Bruneck, Italy) and Cad4dent (CD, Canada)...
May 18, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29772034/three-dimensional-analysis-of-internal-adaptations-of-crowns-cast-from-resin-patterns-fabricated-using-computer-aided-design-computer-assisted-manufacturing-technologies
#3
Yushu Liu, Hongqiang Ye, Yong Wang, Yijao Zhao, Yuchun Sun, Yongsheng Zhou
PURPOSE: To evaluate the internal adaptations of cast crowns made from resin patterns produced using three different computer-aided design/computer-assisted manufacturing technologies. MATERIALS AND METHODS: A full-crown abutment made of zirconia was digitized using an intraoral scanner, and the design of the crown was finished on the digital model. Resin patterns were fabricated using a fused deposition modeling (FDM) 3D printer (LT group), a digital light projection (DLP) 3D printer (EV group), or a five-axis milling machine (ZT group)...
May 17, 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29772033/passivity-of-fit-of-a-novel-prefabricated-implant-supported-mandibular-full-arch-reconstruction-a-comparative-in-vitro-study
#4
Matthias Karl, Roberto Carretta, Kenji W Higuchi
PURPOSE: To quantify the strain development of a new prefabricated implant-supported mandibular full-arch reconstruction. MATERIALS AND METHODS: Five resin models reflecting edentulous mandibles were each restored with three interforaminal implants and prefabricated frameworks with a novel compensation mechanism, cast frameworks, and computer-aided design/computer-assisted manufacturing (CAD/CAM)-fabricated frameworks. Strains were recorded during superstructure fixation...
May 17, 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29771829/repairing-a-facial-cleft-by-polyether-ether-ketone-implant-combined-with-titanium-mesh
#5
Yuan Deng, Weiwei Tang, Zhengkang Li
The Tessier Number 4 cleft is one of the rarest, most complex craniofacial anomalies that presents difficulties in surgical treatment. In this article, we report a case of simultaneous facial depression, eye displacement, and medial canthus deformity. In this case, the maxillary bony defect was reconstructed using computer-assisted design computer-assisted manufacturing (CAD-CAM) polyether-ether-ketone (PEEK) material, and the orbital floor defect was repaired with AO prefabricated titanium mesh. Additionally, the medial canthus was modified with canthopexy and a single Z-plasty flap...
May 15, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29770877/polishing-effects-and-wear-performance-of-chairside-cad-cam-materials
#6
Mike Matzinger, Sebastian Hahnel, Verena Preis, Martin Rosentritt
OBJECTIVES: To investigate the surface roughness of CAD/CAM materials immediately after milling and after different chairside and labside polishing procedures. A two-body wear test was performed to compare the different wear characteristics of the materials and the corresponding antagonists. MATERIALS AND METHODS: Specimens (n = 12 per series) from different CAD/CAM materials (three composites: Lava Ultimate, Cerasmart, BRILLIANT Crios; one hybrid ceramic: VITA Enamic; three ceramics: Celtra Duo, VITA Suprinity, IPS Emax...
May 16, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29765979/influence-of-material-selection-on-the-marginal-accuracy-of-cad-cam-fabricated-metal-and-all-ceramic-single-crown-copings
#7
Matthias Rödiger, Lea Schneider, Sven Rinke
This study evaluated the marginal accuracy of CAD/CAM-fabricated crown copings from four different materials within the same processing route. Twenty stone replicas of a metallic master die (prepared upper premolar) were scanned and divided into two groups. Group 1 ( n = 10) was used for a pilot test to determine the design parameters for best marginal accuracy. Group 2 ( n = 10) was used to fabricate 10 specimens from the following materials with one identical CAD/CAM system (GAMMA 202, Wissner GmbH, Goettingen, Germany): A = commercially pure (cp) titanium, B = cobalt-chromium alloy, C = yttria-stabilized zirconia (YSZ), and D = leucite-reinforced glass-ceramics...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29763362/fracture-strength-and-precision-of-fit-of-implant-retained-monolithic-zirconia-crowns
#8
Pauliina Moilanen, Jenni Hjerppe, Lippo Lassila, Timo Närhi
OBJECTIVES: To examine fracture strength and precision of fit of screw-retained anterior monolithic zirconia crowns made directly on implants or by cementing on prefabricated titanium bases, and to compare these to industrially produced Procera crowns. . MATERIALS AND METHODS: Monolithic screw-retained implant crowns were produced by CAD/CAM method (Zirkonzahn, Italy) using either partially (PSZ, Prettau, Zirconzahn, Italy) or fully stabilized (FSZ, Prettau Anterior, Zirkonzahn) zirconia...
May 15, 2018: Journal of Oral Implantology
https://www.readbyqxmd.com/read/29763356/chairside-cad-cam-composite-onlays-for-the-restoration-of-primary-molars
#9
Elisabeth Dursun, Aude Monnier-Da Costa, Christian Moussally
After pulp therapy or with multi-surface caries in primary molars, pre-formed stainless steel crowns are usually placed to ensure tooth longevity. Esthetic alternatives, such as zirconia crowns, have been proposed, but they are invasive. Here we describe two cases of chairside computer-aided design and computer-aided manufacturing (CAD/CAM) technology used to treat extended and/or deep caries on primary molars. A powder-free chairside CAD/CAM system, a milling unit and machinable high-performance composite blocks were used...
May 15, 2018: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/29756132/comparison-between-five-cad-cam-systems-for-fit-of-zirconia-copings
#10
Syed Rashid Habib, Asim Khaled Al Otaibi, Talal Ali Al Anazi, Samer Mosleh Al Anazi
OBJECTIVE: The aim of this in-vitro study was to investigate the marginal and internal fit of zirconia copings fabricated by five CAD/CAM (computer-aided design/computer-assisted manufacture) systems. METHOD AND MATERIALS: A typodont mandibular right first molar was prepared according to ideal parameters for a zirconia crown, scanned digitally, and 100 identical resin dies fabricated by 3D printing. Samples were randomly divided into five groups and sent to CAD/CAM systems for zirconia copings (A, Ceramill-Motion 2, Amann Girrbach; B, Weiland, Ivoclar Vivadent; C, Cerec, Ivoclar Vivadent; D, Prettau Zirconia, Zirkonzahn; E, Cad4dent)...
2018: Quintessence International
https://www.readbyqxmd.com/read/29741238/effect-of-surface-modification-on-in-depth-transformations-and-flexural-strength-of-zirconia-ceramics
#11
Kan Wongkamhaeng, Deborah V Dawson, Julie A Holloway, Isabelle Denry
PURPOSE: Chairside surface adjustments of zirconia dental restorations enhance the toughening stress-induced tetragonal-to-monoclinic phase transformation and domain reorientation by ferro-elastic domain switching (FDS), but also trigger subsurface damage, which could compromise long-term clinical performance. The purpose of this study was to assess the depth of phase transformation, associated FDS, and flexural strength of dental zirconia (BruxZir HT 2.0), after chairside surface treatments...
May 9, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29731271/effect-of-preparation-design-for-all-ceramic-restoration-on-maxillary-premolar-a-3d-finite-element-study
#12
Ebrahim Maghami, Ehsan Homaei, Khalil Farhangdoost, Edmond Ho Nang Pow, Jukka Pekka Matinlinna, James Kit-Hon Tsoi
PURPOSE: The aim of this study was to investigate and quantify the effect of preparation design parameters on a premolar restored with two different CAD/CAM ceramic crowns by three-dimensional finite element analysis (FEA). METHODS: A restored human first premolar was digitized by a micro-CT scanner and a 3D model was created by a medical image processing software (Mimics). Following segmentation, dentine and ceramic were extracted by a surface meshing software (3-matic)...
May 3, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29728555/prosthetic-rehabilitation-using-a-telescopic-crown-constructed-with-computer-assisted-design-and-computer-assisted-manufacturing-a-case-report-with-a-2-year-follow-up
#13
Nasser M Al Ahmari
Aim and background: This case report describes a 74-year-old female patient whose teeth were rehabilitated using telescopic crowns (TCs) on abutments and fixed dental prostheses (FDPs) in the maxillary arch with the aid of computer-assisted design and computer-assisted manufacturing (CAD/CAM) technology. The mandibular arch was restored using casted removable dental prostheses (RDPs) and surveyed crowns. Case report: The treatment sequences were followed as recommended in the dental literature. First, existing defective restorations were eliminated, caries was removed, and excellent mouth preparation was performed...
April 1, 2018: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29724561/loss-of-tooth-structure-associated-with-preparation-for-two-monolithic-cad-cam-complete-coverage-restorations
#14
Ramtin Sadid-Zadeh, Adrian Farsaii, Athena Goodarzi, Elaine L Davis
STATEMENT OF PROBLEM: Different techniques are used to fabricate complete coverage restorations. Each fabrication technique requires a specific preparation design that may violate a principle of tooth preparation, that is, conservation of tooth structure. PURPOSE: The purpose of this in vitro study was to compare the volume of loss of mandibular first molar structure associated with a preparation for computer-aided design and computer-aided manufacturing (CAD-CAM) versus conventionally fabricated complete coverage restorations...
April 30, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29724553/effect-of-metal-opaquer-on-the-final-color-of-3-ceramic-crown-types-on-3-abutment-configurations
#15
Rabia Arif, Burak Yilmaz, Aras Mortazavi, Tuncer B Ozcelik, William M Johnston
STATEMENT OF PROBLEM: The effect of a recently introduced metal opaquer when used to mask the color of a titanium abutment under ceramic crown systems is unknown. PURPOSE: The purpose of this study was to compare the color coordinates of 3 ceramic crown types-characterized monolithic lithium disilicate (LDC) (IPS e.max; Ivoclar Vivadent AG), layered lithium disilicate (LDL) (IPS e.max; Ivoclar Vivadent AG), and layered zirconia (ZL) (H.C. Starck)-on 3 abutment configurations, nonopaqued titanium (Ti), resin opaqued titanium (Op), and zirconia (Zir)...
April 30, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29724550/effect-of-different-resin-cements-and-surface-treatments-on-the-shear-bond-strength-of-ceramic-glass-polymer-materials
#16
Gülce Alp, Meryem Gülce Subaşı, William M Johnston, Burak Yilmaz
STATEMENT OF PROBLEM: The effect of different surface treatment techniques on the bond strength of different types of ceramic-glass polymer computer-assisted design and computer-assisted manufacturing (CAD-CAM) materials and resin cements after aging is unknown. PURPOSE: The purpose of this in vitro study was to evaluate the surface roughness of different ceramic-glass polymer CAD-CAM materials after 2 different surface treatments and the effect of material, surface treatment, resin cement, and aging on bond strength...
April 30, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29723323/repair-success-of-two-innovative-hybrid-materials-as-a-function-of-different-surface-treatments
#17
Numan Tatar, Cagri Ural
PURPOSE: To evaluate surface treatments for chipping in order to avoid bonding problems between hybrid materials and composite resin and to determine the optimal surface treatment method during intraoral repair of restorations to achieve clinical success. MATERIALS AND METHODS: A total of 96 samples were prepared from computer-aided design/computer-assisted manufactured (CAD/CAM) blocks: 48 polymer-infiltrated ceramic (PIC) and 48 resin nano-ceramic (RNC). Prior to application of the surface treatments, the two test groups were each divided into four subgroups: control group; hydrofluoric acid group; hydrofluoric acid with silane group; and air-abraded with silica-coated aluminum oxide (Al2 O3 ) sand with silane group...
May 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29720149/evaluation-of-concordance-between-cad-cam-and-clinical-positions-of-abutment-shoulder-against-mucosal-margin-an-observational-study
#18
Jan K Pietruski, Anna Skurska, Anna Bernaczyk, Robert Milewski, Maria Julia Pietruska, Peter Gehrke, Małgorzata D Pietruska
BACKGROUND: While working on CAD/CAM-customized abutments, the use of standard impression copings with a circular diameter produces inconsistency within the emergence profile. It may begin with a collapse of the supra-implant mucosa during impression taking, then lead to a computer-generated mismatch of the position and outline of the abutment shoulder, and consequently result in a compromised outcome of anticipated treatment. The aim of the study was to compare the virtual and clinical positions of the abutment shoulder in relation to the mucosal margin after the abutment delivery...
May 2, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/29715068/application-of-3d-printed-patient-specific-skeletal-implants-augmented-with-autologous-skeletal-stem-cells
#19
Vitali Goriainov, Josephine K McEwan, Richard O C Oreffo, Doug G Dunlop
Joint replacements have proved a medical success providing symptomatic relief and return to mobility in many patients with arthritis. However, multiple revision surgeries due to joint failure can result in complex revision scenarios with significant bone tissue loss, in an elderly population, which poses a significant clinical challenge. Computer-aided design-computer-assisted manufacturing (CAD-CAM) prototyped bespoke implants are currently being used as an alternative and innovative approach for joint restoration in salvage cases, while the incorporation of autologous skeletal stem cells to optimize regenerative capacity can enhance implant osseointegration...
May 1, 2018: Regenerative Medicine
https://www.readbyqxmd.com/read/29713430/repair-bond-strength-of-resin-composite-to-bilayer-dental-ceramics
#20
Ayse Seda Ataol, Gulfem Ergun
PURPOSE: The purpose of this study was to investigate the effect of various surface treatments (ST) on the shear bond strength of resin composite to three bilayer dental ceramics made by CAD/CAM and two veneering ceramics. MATERIALS AND METHODS: Three different bilayer dental ceramics and two different veneering ceramics were used (Group A: IPS e.max CAD+IPS e.max Ceram; Group B: IPS e.max ZirCAD+IPS e.max Ceram, Group C: Vita Suprinity+Vita VM11; Group D: IPS e...
April 2018: Journal of Advanced Prosthodontics
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