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Lithium disilicate

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https://www.readbyqxmd.com/read/28222886/effect-of-different-acidic-solutions-on-the-optical-behavior-of-lithium-disilicate-ceramics
#1
Daniela Micheline Dos Santos, Emily Vivianne Freitas da Silva, Aljomar José Vechiato-Filho, Denis Watanabe, Sandro Basso Bitencourt, Aimée Maria Guiotti, Marcelo Coelho Goiato
STATEMENT OF PROBLEM: The stability of the optical characteristics of dental ceramics is essential. Degradation of these materials resulting from pH or temperature alterations in the oral cavity can lead to treatment failure. PURPOSE: The purpose of this in vitro study was to evaluate the color change (ΔE), the L* coordinate, the translucency parameter, and the contrast ratio of lithium disilicate ceramic exposed to commonly used and potentially colorant solutions...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222866/shear-bond-strength-of-zirconia-based-ceramics-veneered-with-2-different-techniques
#2
Ahmed M Zaher, J L Hochstedler, Frederick A Rueggeberg, Edwin L Kee
STATEMENT OF PROBLEM: Delamination of veneering ceramic is reported as one of the most frequent problems associated with veneered zirconia restorations. PURPOSE: The purpose of this in vitro study was to compare the shear bond strength of sintered lithium disilicate to that of pressed fluorapatite glass-ceramic on a zirconia substrate. MATERIAL AND METHODS: Thirty zirconia blocks (20×15×2.5-mm thick) were cut, sintered, and divided into 2 groups...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28216850/versatility-of-peek-as-a-fixed-partial-denture-framework
#3
Nikita Sinha, Nidhi Gupta, K Mahendranadh Reddy, Y M Shastry
Materials used for fixed partial denture (FPD) frameworks have had properties of excellent strength, durability, and biocompatibility. Some of the materials which have been used till date include alloys, ceramics, and high-performance polymers such as zirconia, Ni-Cr, lithium disilicate, and so on. All these, though excellent, have their advantages and disadvantages. Hence, the search has always been on for a better material. One such material, which has made its foray into dentistry in the recent times, is polyetheretherketone (PEEK)...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28216839/a-study-on-the-wear-of-enamel-caused-by-monolithic-zirconia-and-the-subsequent-phase-transformation-compared-to-two-other-ceramic-systems
#4
Amreen Rupawala, Smita I Musani, Pallavi Madanshetty, Ramandeep Dugal, Umang D Shah, Ektaa J Sheth
PURPOSE: The purpose of this in vitro research project was to evaluate and compare the wear behavior of human tooth enamel opposing monolithic zirconia and other different ceramic restorative materials and also to observe the tetragonal to monoclinic phase transformation in zirconia-based ceramics that may occur while simulating wear occurring at room temperature in a wet environment. MATERIALS AND METHODS: A total of sixty samples were prepared for this study. Fifteen discs of glazed zirconia, 15 discs of polished zirconia without glaze, 15 discs of metal ceramic, and 15 discs of lithium disilicate were fabricated...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28214537/biomechanical-behavior-of-endodontically-treated-premolars-using-different-preparation-designs-and-cad-cam-materials
#5
Diogo Pedrollo Lise, Annelies Van Ende, Jan De Munck, Thaís Yumi Umeda Suzuki, Luiz Clovis Cardoso Vieira, Bart Van Meerbeek
OBJECTIVES: To evaluate the effect of restoration design ('2.5-mm deep endocrown', '5-mm deep endocrown' or '5-mm deep post&crown') and CAD/CAM material type (composite or lithium disilicate glass-ceramic) on the load-to-failure of endodontically treated premolars in absence of any ferrule. METHODS: The crowns of 48 single-rooted premolars were cut and the roots were endodontically treated. Teeth were randomly divided into six groups (n=8); teeth in each group were restored using one of the two tested materials with standardized CAD/CAM fabricated endocrowns (with either 2...
February 15, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28194358/effect-of-adhesive-luting-on-the-fracture-resistance-of-zirconia-compared-to-that-of-composite-resin-and-lithium-disilicate-glass-ceramic
#6
Myung-Jin Lim, Kwang-Won Lee
OBJECTIVES: The purpose of this study was to evaluate the effect of adhesive luting on the fracture resistance of zirconia compared to that of a composite resin and a lithium disilicate glass ceramic. MATERIALS AND METHODS: The specimens (dimension: 2 mm × 2 mm × 25 mm) of the composite resin, lithium disilicate glass ceramic, and yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) were prepared. These were then divided into nine groups: three non-luting groups, three non-adhesive luting groups, and three adhesive luting groups, for each restorative material...
February 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/28159322/biocompatibility-of-polymer-infiltrated-ceramic-network-picn-materials-with-human-gingival-keratinocytes-hgks
#7
Charlotte Grenade, Marie-Claire De Pauw-Gillet, Catherine Pirard, Virginie Bertrand, Corinne Charlier, Alain Vanheusden, Amélie Mainjot
OBJECTIVE: Biocompatibility of polymer-infiltrated-ceramic-network (PICN) materials, a new class of CAD-CAM composites, is poorly explored in the literature, in particular, no data are available regarding Human Gingival Keratinocytes (HGK). The first objective of this study was to evaluate the in vitro biocompatibility of PICNs with HGKs in comparison with other materials typically used for implant prostheses. The second objective was to correlate results with PICN monomer release and indirect cytotoxicity...
January 31, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28154316/effect-of-frame-design-and-veneering-material-on-biomechanical-behavior-of-zirconia-dental-crowns-veneered-with-overpressing-ceramics
#8
Liliana Porojan, Florin Topală, Sorin Porojan, Cristina Savencu
The objective of this investigation was to compare alternative framework designs of molar zirconia crowns veneered with various overpressing ceramics and to predict the biomechanical behavior based on the stress evaluation. The hypothesis of the study is that the zirconia framework design and type of the veneering material, using the same technological procedure, may influence the biomechanical behavior of the restorations. Three geometric models with differential coping designs (uniform thickness, cutback and buccal reduction) were developed and two types of hot-pressed ceramics (leucite and lithium disilicate reinforced) were analyzed for the veneers...
February 1, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28152246/the-marginal-fit-of-cad-cam-monolithic-ceramic-and-metal-ceramic-crowns
#9
Yolanda Freire, Esther Gonzalo, Carlos Lopez-Suarez, Maria J Suarez
PURPOSE: Studies on the marginal fit of monolithic restorations are limited. This study aimed to evaluate the marginal fit among monolithic zirconia, monolithic lithium disilicate, and conventional metal-ceramic crowns and to compare the buccal and lingual surfaces. MATERIALS AND METHODS: Thirty standardized stainless steel master dies were fabricated (height: 5 mm; convergence: 6°; chamfer: 1 mm). The dies were randomly divided into three groups (n = 10 each) according to the material used to construct the crowns: group 1 (LM): Lava Plus; group 2 (DM): IPS e...
February 2, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28112854/a-current-perspective-on-screw-retained-single-implant-restorations-a-review-of-pertinent-literature
#10
REVIEW
George Priest
OBJECTIVE: There is a trend toward increased use of screw-retained single-implant restorations. A comprehensive literature review was undertaken to examine the data related to screw- and cement-retention and to objectively evaluate the innovations in implant dentistry that have led to this resurgence. OVERVIEW: When comparing the two options, survival and complication rates are similar, bone and soft-tissue levels are comparable, and zirconia offers esthetic advantages for both selections...
January 23, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28111383/fracture-strength-of-cad-cam-fabricated-lithium-disilicate-and-resin-nano-ceramic-restorations-used-for-endodontically-treated-teeth
#11
Merve Bankoğlu Güngör, Bilge Turhan Bal, Handan Yilmaz, Cemal Aydin, Seçil Karakoca Nemli
The purpose of the present study was to evaluate and compare the fracture strength and failure modes of endocrowns, zirconia post, and fiber post supported restorations and predict the clinical outcomes of six different prostheses used for endodontically treated teeth. Sixty (n=10) maxillary central incisors were restored with zirconia post/resin-nano-ceramic crown (ZrRNC), fiber post/resinnano-ceramic crown (FbRNC), zirconia post/lithium disilicate ceramic crown (ZrLDS), fiber post/lithium disilicate ceramic crown (FbLDS), resin-nano-ceramic endocrown (EndoRNC), and lithium disilicate ceramic endocrown (EndoLDS)...
January 20, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28111135/fracture-resistance-of-glazed-full-contour-zls-incisor-crowns
#12
Franz Sebastian Schwindling, Stefan Rues, Marc Schmitter
PURPOSE: To compare the failure behaviour of zirconia-reinforced lithium silicate (Celtra Duo, DeguDent) with that of lithium disilicate (IPS e.max CAD, Ivoclar Vivadent) and feldspar (Mark II, VITA) ceramics. METHODS: Three groups of sixteen glazed maxillary incisor crowns were produced. The inner surfaces of the crowns were etched, then luted to metal dies with self-adhesive cement. Single load-to-failure tests were performed before and after thermo-mechanical ageing...
January 19, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28107637/survival-predictions-of-ceramic-crowns-using-statistical-fracture-mechanics
#13
S Nasrin, N Katsube, R R Seghi, S I Rokhlin
This work establishes a survival probability methodology for interface-initiated fatigue failures of monolithic ceramic crowns under simulated masticatory loading. A complete 3-dimensional (3D) finite element analysis model of a minimally reduced molar crown was developed using commercially available hardware and software. Estimates of material surface flaw distributions and fatigue parameters for 3 reinforced glass-ceramics (fluormica [FM], leucite [LR], and lithium disilicate [LD]) and a dense sintered yttrium-stabilized zirconia (YZ) were obtained from the literature and incorporated into the model...
January 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28095519/a-clinical-study-assessing-the-influence-of-anodized-titanium-and-zirconium-dioxide-abutments-and-peri-implant-soft-tissue-thickness-on-the-optical-outcome-of-implant-supported-lithium-disilicate-single-crowns
#14
Francisco Martínez-Rus, Marta Prieto, María P Salido, Cristina Madrigal, Mutlu Özcan, Guillermo Pradíes
PURPOSE: To assess the influence of anodized titanium and zirconium dioxide abutments and peri-implant soft tissue thickness on the optical outcome of implant-supported lithium disilicate single crowns. MATERIALS AND METHODS: Twenty patients with a missing maxillary single incisor, canine, or first premolar received an endosseous implant after a two-stage surgery protocol. After healing and soft tissue conditioning, peri-implant soft tissues were reproduced in the impression, and the thickness was measured...
January 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28093860/monolithic-implant-supported-lithium-disilicate-ls2-crowns-in-a-complete-digital-workflow-a-prospective-clinical-trial-with-a-2-year-follow-up
#15
Tim Joda, Marco Ferrari, Urs Brägger
BACKGROUND: The technical development of digital processing allows the production of anatomically full-contoured implant-supported restorations. PURPOSE: The aim of this prospective clinical trial was to analyze the treatment concept of monolithic lithium disilicate (LS2) single-unit restorations in a complete digital workflow. MATERIAL AND METHODS: Forty-four patients were restored with 50 screw-retained monolithic implant LS2 crowns bonded to pre-fabricated titanium abutments on soft tissue level implants (Institut Straumann AG, Basel, Switzerland) in premolar and molar sites...
January 16, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/28089394/grinding-damage-assessment-for-cad-cam-restorative-materials
#16
Philippe Curran, Maria Cattani-Lorente, H W Anselm Wiskott, Stéphane Durual, Susanne S Scherrer
OBJECTIVES: To assess surface/subsurface damage after grinding with diamond discs on five CAD-CAM restorative materials and to estimate potential losses in strength based on crack size measurements of the generated damage. METHODS: The materials tested were: Lithium disilicate (LIT) glass-ceramic (e.max CAD), leucite glass-ceramic (LEU) (Empress CAD), feldspar ceramic (VM2) (Vita Mark II), feldspar ceramic-resin infiltrated (EN) (Enamic) and a composite reinforced with nano ceramics (LU) (Lava Ultimate)...
January 12, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28089331/evaluation-of-marginal-and-internal-adaptation-of-hybrid-and-nanoceramic-systems-with-microcomputed-tomography-an-in%C3%A2-vitro-study
#17
Güler Yildirim, Ismail H Uzun, Ali Keles
STATEMENT OF PROBLEM: The accuracy of recently introduced chairside computer-aided design and computer-aided manufacturing (CAD-CAM) blocks is not well established, and marginal integrity and internal adaptation are not known. PURPOSE: The purpose of this in vitro study was to evaluate the marginal and internal adaptation of hybrid and nanoceramics using microcomputed tomography (μ-CT). MATERIAL AND METHODS: The marginal and internal adaptation of 3 polymer-infiltrated ceramic-network (PICN) materials (Vita Enamic [VE]; Lava Ultimate [LU]; Vita Suprinity [VS]) were compared with lithium disilicate (IPS e...
January 12, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28072987/-a-pilot-clinical-study-of-immediate-provisionalization-with-a-chairside-computer-aided-design-and-computer-aided-manufacture-monolithic-crown-for-single-tooth-immediate-implant-placement
#18
J H Tian, P Di, Y Lin, Y Zhang, D H Wei, H Y Cui
Objective: To evaluate the primary clinical outcomes of immediate provisionalization with a monolithic crown utilizing a novel chairside computer aided design and computer aided manufacture (CAD/CAM) workflow for single tooth immediate implant placement. Methods: This pilot study was a prospective within-subjects design. Thirteen consecutive patients were included and diagnosed with untreatable single incisor or premolar with fine general and local anatomical conditions. The trial was conducted at Department of Implantology, Peking University School and Hospital of Stomatology, Beijing, between January 2016 and June 2016...
January 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28069245/extended-glaze-firing-on-ceramics-for-hard-machining-crack-healing-residual-stresses-optical-and-microstructural-aspects
#19
Iana L Aurélio, Lucio S Dorneles, Liliana G May
OBJECTIVE: To evaluate the effect of extended and conventional (manufacturer-recommended) glaze firings on crack healing, residual stresses, optical characteristics and crystalline structure of four ceramics for hard machining. METHODS: Rectangular specimens were obtained by sectioning densely sintered feldspathic (FEL), leucite- (LEU), lithium disilicate- (DIS), and zirconia-reinforced lithium silicate-based (ZLS) prefabricated ceramic blocks and divided into groups according to the applied glaze firing (n=5): conventional glaze/manufacturer-recommended (G), extended glaze (EG) and control/no heat treatment (C)...
January 6, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28068266/translucency-and-strength-of-high-translucency-monolithic-zirconium-oxide-materials
#20
Todd D Church, Jeffrey P Jessup, Villa L Guillory, Kraig S Vandewalle
The purpose of this study was to evaluate the translucency and strength of highly translucent monolithic zirconia ceramic materials recently introduced to the market. Four monolithic zirconium oxide materials promoted as having high translucency (BruxZir Shaded 16, BruxZir HT, Lava Plus, and inCoris TZI C) were compared to a high-translucency, lithium disilicate monolithic glass-ceramic material (IPS e.max CAD HT). To evaluate translucency, the materials were sectioned into 0.5-, 1.0-, 1.5-, and 2.0-mm-thick specimens; all were sintered and polished...
January 2017: General Dentistry
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