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https://www.readbyqxmd.com/read/28815238/-effect-of-sintering-temperature-on-mechanical-properties-of-dental-zirconia-toughened-alumina-ceramics
#1
Jiang-Yuan Fan, Ting-Ting Lin, Fang-Xuan Hu, Rui-Bin Zheng, Fan Fan, Jian-Feng Ma
PURPOSE: To investigate the effect of sintering temperature on mechanical properties of dental zirconia toughened alumina (ZTA) ceramics prepared by gel-casting technique. METHODS: The samples prepared by gel-casting were sintered at 1100, 1200, 1250, 1300 and 1400degrees centigrade for each group. The flexural strength, fracture toughness, Vickers hardness and brittleness index were obtained and microscopic morphology of each group was observed under scanning electron microscope (SEM)...
April 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28806427/fixed-dental-prostheses-and-single-tooth-crowns-based-on-ceria-stabilized-tetragonal-zirconia-alumina-nanocomposite-frameworks-outcome-after-2-years-in-a-clinical-trial
#2
Fabian Hüttig, Jan P Keitel, Andreas Prutscher, Sebastian Spintzyk, Andrea Klink
PURPOSE: This clinical trial tested bilayered restorations based on ceria-stabilized tetragonal zirconia/alumina frameworks veneered with feldspathic ceramic. MATERIALS AND METHODS: A total of 67 crowns and 40 fixed dental prostheses (FDPs) were luted in 57 patients with self-etching/self-adhesive composite resin cement. Dental status and integrity of restorations were evaluated at 2 weeks, 6 months, and then annually. RESULTS: A total of 66 crowns and 36 FDPs (88% posterior) survived for success rates of 93...
August 14, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28792115/digital-workflow-in-full-arch-implant-rehabilitation-with-segmented-minimally-veneered-monolithic-zirconia-fixed-dental-prostheses-2-year-clinical-follow-up
#3
Panos Papaspyridakos, Kiho Kang, Catherine DeFuria, Sarah Amin, Yukio Kudara, Hans-Peter Weber
OBJECTIVE: To illustrate a digital workflow in full-arch implant rehabilitation with minimally veneered monolithic zirconia and to report the outcomes including technical complications. CLINICAL CONSIDERATIONS: Three patients (5 edentulous arches) received full-arch fixed implant rehabilitation with monolithic zirconia and mild facial porcelain veneering involving a digital workflow. The incisal edges and occluding surface areas were milled out of monolithic zirconia to reduce the possibility of chipping...
August 9, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28789858/aging-of-3y-tzp-dental-zirconia-and-yttrium-depletion
#4
P Pandoleon, E Kontonasaki, N Kantiranis, N Pliatsikas, P Patsalas, L Papadopoulou, T Zorba, K M Paraskevopoulos, P Koidis
OBJECTIVE: Yttrium-stabilized zirconia is susceptible to low temperature degradation after interaction with water. Various mechanisms by which water molecules destabilize the tetragonal phase have been proposed, while the concept of yttrium depletion by the incorporation of hydroxyl ions in the crystalline structure either through the formation of YOH/ZrOH bonds or small α-Y(OH)3 crystallites, is prevailing. The present study was performed to investigate the surface alterations on a 3Y-TZP dental ceramic during the process of in-vitro aging and to further explore the yttrium depletion mechanism that occurs upon interaction with water...
August 5, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28773116/zirconia-hydroxyapatite-composites-synthesized-via-sol-gel-influence-of-hydroxyapatite-content-and-heating-on-their-biological-properties
#5
Flavia Bollino, Emilia Armenia, Elisabetta Tranquillo
Zirconia (ZrO₂) and zirconia-based glasses and ceramics are materials proposed for use in the dental and orthopedic fields. In this work, ZrO₂ glass was modified by adding different amounts of bioactive and biocompatible hydroxyapatite (HAp). ZrO₂/HAp composites were synthesized via the sol-gel method and heated to different temperatures to induce modifications of their chemical structure, as ascertained by Fourier transform infrared spectroscopy (FTIR) analysis. The aim was to investigate the effect of both HAp content and heating on the biological performances of ZrO₂...
July 5, 2017: Materials
https://www.readbyqxmd.com/read/28772973/performance-of-a-new-al%C3%A2-o%C3%A2-ce-tzp-ceramic-nanocomposite-dental-implant-a-pilot-study-in-dogs
#6
Roberto Lopez-Píriz, Adolfo Fernández, Lidia Goyos-Ball, Sergio Rivera, Luis A Díaz, Manuel Fernández-Domínguez, Catuxa Prado, José S Moya, Ramón Torrecillas
Although titanium remains as the prevalent material in dental implant manufacturing new zirconia-based materials that overcome the major drawbacks of the standard 3Y-yttria partially-stabilized zirconia (Y-TZP) are now emerging. In this study, a new ceramic nanocomposite made of alumina and ceria-stabilized TZP (ZCe-A) has been used to produce dental implants with the mechanic and topographic characteristics of a pilot implant design to evaluate bone and soft tissue integration in a dog model (n = 5). Histological cross-section analysis of the implanted ceramic fixations (n = 15) showed not only perfect biocompatibility, but also a high rate of osseous integration (defined as the percentage of bone to implant contact) and soft tissue attachment...
June 3, 2017: Materials
https://www.readbyqxmd.com/read/28768230/thermal-stress-analysis-of-ceramic-laminate-veneer-restorations-with-different-incisal-preparations-using-micro-computed-tomography-based-3d-finite-element-models
#7
Alper Tunga Celebi, Esra Icer, Meltem Mert Eren, Cengiz Baykasoglu, Ata Mugan, Esra Yildiz
Main objective of this study is to investigate the thermal behavior of ceramic laminate veneer restorations of the maxillary central incisor with different incisal preparations such as butt joint and palatinal chamfer using finite element method. In addition, it is also aimed to understand the effect of different thermal loads which simulates hot and cold liquid imbibing in the mouth. Three-dimensional solid models of the sound tooth and prepared veneer restorations were obtained using micro-computed tomography images...
July 27, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28750109/comparison-of-fixed-dental-prostheses-with-zirconia-and-metal-frameworks-five-year-results-of-a-randomized-controlled-clinical-trial
#8
Irena Sailer, Marc Balmer, Hüsler Jürg, Christoph Hans Franz Hämmerle, Sarah Känel, Daniel Stefan Thoma
PURPOSE: The aim of this study was to test whether posterior zirconia-ceramic (ZC) and metal-ceramic (MC) fixed dental prostheses (FDPs) exhibit similar survival and technical/biologic complication rates. MATERIALS AND METHODS: A total of 58 patients in need of 76 posterior FDPs were randomly assigned to receive 40 ZC and 36 MC FDPs. The restorations were examined at baseline (cementation) and yearly for 5 years. Technical and biologic outcomes were compared. The independent treatment groups were compared with nonparametric Mann-Whitney test for metric variables and with Fisher exact test for categoric data...
July 27, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28742283/reliability-of-visual-and-instrumental-color-matching
#9
Christopher Igiel, Karl Martin Lehmann, Razvan Ghinea, Michael Weyhrauch, Ysbrand Hangx, Herbert Scheller, Rade D Paravina
OBJECTIVE: The aim of this investigation was to evaluate intra-rater and inter-rater reliability of visual and instrumental shade matching. MATERIALS AND METHODS: Forty individuals with normal color perception participated in this study. The right maxillary central incisor of a teaching model was prepared and restored with 10 feldspathic all-ceramic crowns of different shades. A shade matching session consisted of the observer (rater) visually selecting the best match by using VITA classical A1-D4 (VC) and VITA Toothguide 3D Master (3D) shade guides and the VITA Easyshade Advance intraoral spectrophotometer (ES) to obtain both VC and 3D matches...
July 25, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28735678/all-ceramic-inlay-retained-fixed-dental-prostheses-for-replacing-posterior-missing-teeth-a-systematic-review
#10
REVIEW
Raquel Castillo-Oyagüe, Rocío Sancho-Esper, Christopher D Lynch, María-Jesús Suárez-García
PURPOSE: To evaluate the current status of all-ceramic inlay-retained fixed dental prostheses (CIR-FDPs) for the replacement of posterior teeth. STUDY SELECTION: Screening of titles and abstracts, full-text analysis for inclusion eligibility, quality assessment, data extraction and evaluation of the scientific evidence were performed independently by two reviewers. The electronic databases MEDLINE/PubMed, EMBASE, Cochrane Central Register of Controlled Trials, and Compludoc were searched with no restriction to publication date or language...
July 20, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28729803/anterosuperior-rehabilitation-with-metal-free-fixed-prosthesis-based-on-zirconia
#11
Sthelen Nayara Cenci, Igor Alessandro Gontarsky, Marcella Goetz Moro, Lidia Olga Bach Pinheiro, Adriana Postiglione Bührer Samra
The loss of upper front dental elements causes functional and psychosocial problems to the affected individuals. In this case report, the treatment planning considered hard and soft tissue loss for a complex fixed partial denture (FPD) rehabilitation. The six-element, all-ceramic FPD was manufactured using a computer-aided design/computer-aided manufacturing system with zirconia framework, veneered with leucite-reinforced ceramic. Ceramic artificial gum was also produced to guarantee tooth-facial proportions as well as lip support, promoting both esthetics and phonetics...
April 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28714053/the-influence-of-surface-texture-and-wettability-on-initial-bacterial-adhesion-on-titanium-and-zirconium-oxide-dental-implants
#12
Torsten Wassmann, Stefan Kreis, Michael Behr, Ralf Buergers
BACKGROUND: This study aims to investigate bacterial adhesion on different titanium and ceramic implant surfaces, to correlate these findings with surface roughness and surface hydrophobicity, and to define the predominant factor for bacterial adhesion for each material. METHODS: Zirconia and titanium specimens with different surface textures and wettability (5.0 mm in diameter, 1.0 mm in height) were prepared. Surface roughness was measured by perthometer (R a ) and atomic force microscopy, and hydrophobicity according to contact angles by computerized image analysis...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28713427/a-three-year-retrospective-study-on-survival-of-ceramic-veneered-zirconia-y-tzp-fixed-dental-prostheses-performed-in-private-practices
#13
Veronika Norström Saarva, Göran Bjerkstig, Anders Örtorp, Per Svanborg
OBJECTIVES: The aim of this retrospective study was to evaluate the three-year clinical outcome for ceramic-veneered zirconia fixed dental prostheses (FDPs). METHODS: All patients who were treated with ceramic-veneered zirconia FDPs, in three private practices in Sweden, during the period June 2003 to April 2007 were included. Case records from 151 patients, treated with a total of 184 zirconia FDPs (692 units), were analysed for clinical data. All complications noted in the charts were registered and compared to definitions for success and survival and statistical analysis was performed using the Kaplan-Meier method and a Cox regression model...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28713119/adhesive-bonding-to-computer-aided-design-computer-aided-manufacturing-esthetic-dental-materials-an-overview
#14
Mohamed Moustafa Awad, H Alqahtani, A Al-Mudahi, M S Murayshed, A Alrahlah, Shilpa H Bhandi
AIM: To review the adhesive bonding to different computer-aided design/computer-aided manufacturing (CAD/CAM) esthetic restorative materials. BACKGROUND: The use of CAD/CAM esthetic restorative materials has gained popularity in recent years. Several CAD/ CAM esthetic restorative materials are commercially available. Adhesive bonding is a major determinant of success of CAD/ CAM restorations. Review result: An account of the currently available bonding strategies are discussed with their rationale in various CAD/ CAM materials...
July 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28710653/mechanical-performance-of-cement-and-screw-retained-all-ceramic-single-crowns-on-dental-implants
#15
Matthias Obermeier, Oliver Ristow, Kurt Erdelt, Florian Beuer
OBJECTIVES: This in-vitro study was performed to compare the contact wear, fracture strength and failure mode of implant-supported all-ceramic single crowns manufactured with various fabrication and fixation concepts. MATERIALS AND METHODS: Fifty dental implants (Conelog Ø 4,3mm/L11mm, Camlog Biotechnologies AG) were embedded and treated with all-ceramic molar single-crowns. Three groups received hand-layered zirconia crowns (IPS e.max Ceram/ IPS e.max ZirCAD, Ivoclar Vivadent AG): CZL (cement-retained zirconia-based layered) group crowns were cemented conventionally, SZL (screw-retained zirconia-based layered) group crowns were screw-retained, MZL (modified zirconia-based layered) group crowns showed a different coping design with screw retention...
July 15, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28708925/survival-rate-of-dental-implants-in-patients-with-history-of-periodontal-disease-a-retrospective-cohort-study
#16
Francisco Correia, Sónia Gouveia, António Campos Felino, Ana Lemos Costa, Ricardo Faria Almeida
PURPOSE: To evaluate the differences between the survival rates of implants placed in patients with no history of periodontal disease (NP) and in patients with a history of chronic periodontal disease (CP). MATERIALS AND METHODS: A retrospective cohort study was conducted in which all consenting patients treated with dental implants in a private clinic in Oporto, Portugal, from November 2, 2002 through February 11, 2011 were included. All patients were treated consecutively by the same experimental operator...
July 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28703836/monolithic-zirconia-and-digital-impression-case-report
#17
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/28689909/effects-of-core-and-veneer-thicknesses-on-the-color-of-cad-cam-lithium-disilicate-ceramics
#18
Wol Kang, Jong-Kyoung Park, So-Ri Kim, Woong-Chul Kim, Ji-Hwan Kim
STATEMENT OF PROBLEM: The color of dental ceramics is important for achieving successful esthetic restorations. However, insufficient studies are available of the color of recently introduced computer-aided design-computer-aided manufacturing (CAD-CAM) lithium disilicate ceramics as functions of the core and veneer thicknesses. PURPOSE: The purpose of this in vitro study was to evaluate the effects of the thickness of different core and veneer thicknesses on the color of CAD-CAM lithium disilicate ceramics...
July 6, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28689902/effect-of-layered-manufacturing-techniques-alloy-powders-and-layer-thickness-on-metal-ceramic-bond-strength
#19
Orhun Ekren, Ahmet Ozkomur, Yurdanur Ucar
STATEMENT OF PROBLEM: Direct metal laser sintering (DMLS) and direct metal laser melting (DMLM) have become popular for fabricating the metal frameworks of metal-ceramic restorations. How the type of layered manufacturing device, layer thickness, and alloy powder may affect the bond strength of ceramic to metal substructure is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the bond strength of dental porcelain to metal frameworks fabricated using different layered manufacturing techniques (DMLS and DMLM), Co-Cr alloy powders, and layer thicknesses and to evaluate whether a correlation exists between the bond strength and the number of ceramic remnants on the metal surface...
July 6, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28688950/ten-year-outcome-of-zirconia-ceramic-cantilever-resin-bonded-fixed-dental-prostheses-and-the-influence-of-the-reasons-for-missing-incisors
#20
Matthias Kern, Nicole Passia, Martin Sasse, Christine Yazigi
OBJECTIVES: This clinical study evaluated the long-term outcome and survival rate of all-ceramic cantilever resin-bonded fixed dental prostheses (RBFDPs) made of zirconia-ceramic with a single-retainer design to replace missing incisors. In addition, whether the reason for missing incisors has an influence on the longevity of RBFDPs was analyzed. MATERIALS AND METHODS: One hundred and eight zirconia ceramic cantilever RBFDPs were provided for 87 patients. Seventy-five RBFDPs replaced maxillary incisors and 33 mandibular incisors...
July 5, 2017: Journal of Dentistry
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