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Lithium disilicate

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https://www.readbyqxmd.com/read/28818339/impact-of-machining-on-the-flexural-fatigue-strength-of-glass-and-polycrystalline-cad-cam-ceramics
#1
Sara Fraga, Marina Amaral, Marco Antônio Bottino, Luiz Felipe Valandro, Cornelis Johannes Kleverlaan, Liliana Gressler May
OBJECTIVES: To assess the effect of machining on the flexural fatigue strength and on the surface roughness of different computer-aided design, computer-aided manufacturing (CAD/CAM) ceramics by comparing machined and polished after machining specimens. METHODS: Disc-shaped specimens of yttria-stabilized polycrystalline tetragonal zirconia (Y-TZP), leucite-, and lithium disilicate-based glass ceramics were prepared by CAD/CAM machining, and divided into two groups: machining (M) and machining followed by polishing (MP)...
August 14, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28800900/insufficient-evidence-to-claim-good-outcomes-of-lithium-disilicate-implant-supported-single-crowns-after-5-years
#2
Romina Brignardello-Petersen
No abstract text is available yet for this article.
August 5, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28799392/role-of-dynamic-heterogeneities-in-crystal-nucleation-kinetics-in-an-oxide-supercooled-liquid
#3
Prabhat K Gupta, Daniel R Cassar, Edgar D Zanotto
The temperature at which the classical critical nucleus size is equal to the average size of the cooperatively rearranging regions (CRR) in a supercooled liquid has been referred to as a "cross-over" temperature. We show, for the first time, using published nucleation rate, viscosity, and thermo-physical data, that the cross-over temperature for the lithium disilicate melt is significantly larger than the temperature of the kinetic spinodal and is equal or close to the temperature corresponding to the maximum in the experimentally observed nucleation rates...
December 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28781072/mechanical-and-optical-properties-of-monolithic-cad-cam-restorative-materials
#4
Nazmiye Sen, Yesim Olcer Us
STATEMENT OF PROBLEM: Achieving natural tooth appearance with sufficient mechanical strength is one of the most challenging issues of computer-assisted design and computer-assisted manufacturing (CAD-CAM) materials. However, limited evidence is available regarding their optical and mechanical properties for proper and evidence-based material selection in clinical practice. PURPOSE: The purpose of this in vitro study was to assess and compare the translucency and biaxial flexural strength of 5 monolithic CAD-CAM restorative materials...
August 4, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28740971/monolithic-lithium-disilicate-complete-single-crowns-with-feather-edge-preparation-design-in-the-posterior-region-a-multicentric-retrospective-study-up-to-12-years
#5
Johannes H Schmitz, Davide Cortellini, Stefano Granata, Marco Valenti
OBJECTIVE: This retrospective study evaluated the clinical success and survival of monolithic lithium disilicate single crowns in the posterior region fabricated with feather-edge margins and cemented with resin-based self-etching cement. METHOD AND MATERIALS: In total, 627 pressed monolithic lithium disilicate restorations on posterior teeth (110 first premolars, 151 second premolars, 240 first molars, 121 second molars, 5 third molars) were placed in 335 patients...
July 20, 2017: Quintessence International
https://www.readbyqxmd.com/read/28740324/microhardness-evaluations-of-cad-cam-ceramics-irradiated-with-co2-or-nd-yap-laser
#6
Ahmed El Gamal, Jean Paul Rocca, Carlo Fornaini, Etienne Medioni, Nathalie Brulat-Bouchard
BACKGROUND AND AIMS: The aim of this study was to measure the microhardness values of irradiated computer-aided design/computer-aided manufacturing (CAD/CAM) ceramics surfaces before and after thermal treatment. MATERIALS AND METHODS: Sixty CAD/CAM ceramic discs were prepared and grouped by material, i.e. lithium disilicate ceramic (Emax CAD) and zirconia ceramic (Emax ZirCAD). Laser irradiation at the material surface was performed with a carbon dioxide laser at 5 Watt (W) or 10 W power in continuous mode (CW mode), or with a neodymium:yttrium aluminum perovskite (Nd:YAP) laser at 10 W on graphite and non-graphite surfaces...
March 31, 2017: Laser Therapy
https://www.readbyqxmd.com/read/28735790/patient-specific-finite-element-analysis-of-fiber-post-and-ferrule-design
#7
Monise de Paula Rodrigues, Priscilla Barbosa Ferreira Soares, Andréa Dollores Correia Miranda Valdivia, Roberto Sales Pessoa, Crisnicaw Veríssimo, Antheunis Versluis, Carlos José Soares
INTRODUCTION: A ferrule on anterior endodontic-treated teeth has been evaluated using clinical trials, in vitro tests, and finite element analysis (FEA). The patient-specific FEA with a nonuniform ferrule and nonlinear contact biting load associated with clinical validation can be used to predict failure. METHODS: A patient was selected with both maxillary central incisors with different ferrule designs who received endodontic treatment and restoration using a fiber post, composite core, and computer aided design and computer aided manufacturing lithium disilicate ceramic crowns...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28729537/control-of-crystallization-behaviour-of-supercooled-liquid-composed-of-lithium-disilicate-on-platinum-substrate
#8
Masanori Tashiro, Sohei Sukenaga, Hiroyuki Shibata
Crystalline lithium disilicate (Li2Si2O5, LS2) materials, which have excellent mechanical properties with high transparency, should be obtained efficiently through the crystallization of supercooled liquid composed of LS2. However, in addition to LS2, a lithium monosilicate (Li2SiO3, LS) phase is also precipitated during the crystallization of the liquid. The precipitation of the LS phase renders it difficult to obtain a single-phase LS2 material. Here, we show that by altering the oxygen partial pressure, it is possible to change the selectivity of the precipitated phase by controlling the interfacial phenomena that occur between the liquid and platinum contact material...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28717792/accelerated-fatigue-resistance-%C3%A2-of-novel-design-histoanatomic-%C3%A2-implant-restorations-made-of-%C3%A2-cad-cam-bilaminar-assemblies
#9
Ivan Molina, Jack Goldberg, Claudia Maziero Volpato, Pascal Magne
OBJECTIVES: Evaluate the fatigue resistance and failure mode of novel-design implant restorations made of histoanatomic computer-assisted design/computer-assisted manufacturing (CAD/CAM) bilaminar bonded assemblies. MATERIAL AND METHODS: 60 screw-retained implant restorations were fabricated. Monolithic restorations were used as a control group (15 lithium disilicate: group CE; and 15 nanofilled composite resin: group CL), and compared with bilaminar restorations (15 dentin-shaped lithium disilicate mesostructures with a bonded nanofilled composite resin veneer: group CEL; and 15 dentin-shaped nanofilled composite resin mesostructures with a bonded lithium disilicate veneer: group CLE)...
2017: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/28712740/aspects-of-adhesion-tests-on-resin-glass-ceramic-bonding
#10
Andrew Chi Ho Wong, Tian Tian, James Kit Hon Tsoi, Michael Francis Burrow, Jukka Pekka Matinlinna
OBJECTIVES: This study aimed to compare and contrast two resin-ceramic bond strength tests, the tensile bond strength and the four-point bending tests. The effects of hydrofluoric acid (HF) etching time and storage condition on bond strength were also studied. METHODS: Ceramic beams (N=480) with the dimensions of 2.00×2.00×12.45mm(3) were sectioned from lithium disilicate ceramic ingots (IPS e.max CAD), then polished and fired for final crystallization. The joint surfaces were etched with HF gel (IPS Ceramic etching gel) for 20s, 40s, or 60s of each group (n=160)...
July 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28710653/mechanical-performance-of-cement-and-screw-retained-all-ceramic-single-crowns-on-dental-implants
#11
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/28708007/effect-of-hydrofluoric-acid-concentration-and-etching-time-on-bond-strength-to-lithium-disilicate-glass-ceramic
#12
J Puppin-Rontani, D Sundfeld, A R Costa, A B Correr, R M Puppin-Rontani, G A Borges, Mac Sinhoreti, L Correr-Sobrinho
The aim of this study was to evaluate the influence of different concentrations of hydrofluoric acid (HF) associated with varied etching times on the microshear bond strength (μSBS) of a resin cement to a lithium disilicate glass ceramic. Two hundred seventy-five ceramic blocks (IPS e.max Press [EMX], Ivoclar Vivadent), measuring 8 mm × 3 mm thickness, were randomly distributed into five groups according to the HF concentrations (n=50): 1%, 2.5%, 5%, 7.5%, and 10%. Further random distribution into subgroups was performed according to the following etching times (n=10): 20, 40, 60, 120, and 20 + 20 seconds...
July 14, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28702061/the-effect-of-surface-treatment-with-a-fractional-carbon-dioxide-laser-on-shear-bond-strength-of-resin-cement-to-a-lithium-disilicate-based-ceramic
#13
Farzaneh Ahrari, Alireza Boruziniat, Hamideh Sadat Mohammadipour, Mehrnoosh Alirezaei
BACKGROUND: This study investigated the impact of different surface treatments, including fractional carbon dioxide (CO2) laser on shear bond strength (SBS) of resin cement to lithium disilicate ceramic. MATERIALS AND METHODS: In this in vitro study, 72 blocks of IPS e.max CAD ceramic were randomly divided into six groups in terms of treatment (n = 12). Group 1 underwent etching with 9.6% hydrofluoric (HF) acid, whereas group 2 was subjected to air abrasion with aluminum oxide particles...
May 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28701640/the-effect-of-five-kinds-of-surface-treatment-agents-on-the-bond-strength-to-various-ceramics-with-thermocycle-aging
#14
Yukari Noda, Masatoshi Nakajima, Masahiro Takahashi, Teerapong Mamanee, Keiichi Hosaka, Tomohiro Takagaki, Masaomi Ikeda, Richard M Foxton, Junji Tagami
This study evaluated the effects of ceramic surface treatment agents on shear bond strengths to ceramic materials with and without thermocycling. Ceramic plates were prepared from feldspathic ceramic; AAA, lithium disilicate ceramic material; IPS e.max Press, zirconia ceramic; Lava. Ceramic surfaces were pretreated with one of five surface treatment agents (Clearfil PhotoBond mixed with Porcelainbond activator (PB), Clearfil SE One mixed with Porcelainbond activator (SO), Ceramic Primer (CP), Universal Primer (UP), Scotchbond Universal (SU)), and then a resin cement (Clapearl DC) was filled...
July 12, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28689909/effects-of-core-and-veneer-thicknesses-on-the-color-of-cad-cam-lithium-disilicate-ceramics
#15
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/28681501/systematic-development-of-esthetics-and-function-in-a-young-patient-with-maxillary-dental-aplasia
#16
D Edelhoff, O Prandtner, R Saeidi Pour, A Wichelhaus, A Liebermann
OBJECTIVES: Full-arch rehabilitations in young patients suffering from dental agenesis should compensate for the reduced vertical dimension of occlusion and restore both esthetics and function at minimal biological cost. This requires precise planning and maximum patient compliance during the preprosthetic phase. The pretreatment period with tooth-colored splints promotes a predictable outcome of the final restorations. Clinical considerations: Thanks to better restorative materials and adhesive techniques and increased knowledge of how to preserve sound tooth structures, prosthetic dentistry has increasingly turned toward minimally invasive procedures...
July 6, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28680550/surface-changes-of-metal-alloys-and-high-strength-ceramics-after-ultrasonic-scaling-and-intraoral-polishing
#17
Hyung-In Yoon, Hyo-Mi Noh, Eun-Jin Park
PURPOSE: This study was to evaluate the effect of repeated ultrasonic scaling and surface polishing with intraoral polishing kits on the surface roughness of three different restorative materials. MATERIALS AND METHODS: A total of 15 identical discs were fabricated with three different materials. The ultrasonic scaling was conducted for 20 seconds on the test surfaces. Subsequently, a multi-step polishing with recommended intraoral polishing kit was performed for 30 seconds...
June 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28680546/evaluation-of-the-marginal-and-internal-gaps-of-three-different-dental-prostheses-comparison-of-the-silicone-replica-technique-and-three-dimensional-superimposition-analysis
#18
Jin-Young Park, So-Yeon Bae, Jae-Jun Lee, Ji-Hwan Kim, Hae-Young Kim, Woong-Chul Kim
PURPOSE: The purposes of this study were to evaluate the marginal and internal gaps, and the potential clinical applications of three different methods of dental prostheses fabrication, and to compare the prostheses prepared using the silicone replica technique (SRT) and those prepared using the three-dimensional superimposition analysis (3DSA). MATERIALS AND METHODS: Five Pekkton, lithium disilicate, and zirconia crowns were each manufactured and tested using both the SRT and the two-dimensional section of the 3DSA...
June 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28678947/misfit-and-fracture-load-of-implant-supported-monolithic-crowns-in-zirconia-reinforced-lithium-silicate
#19
Rafael Soares Gomes, Caroline Mathias Carvalho de Souza, Edmara Tatiely Pedroso Bergamo, Dimorvan Bordin, Altair Antoninha Del Bel Cury
Objective: In this study, marginal and internal misfit and fracture load with and without thermal-mechanical aging (TMA) of monolithic ZLS and lithium disilicate (LDS) crowns were evaluated. Material and methods: Crowns were milled using a computer-aided design/computer-aided manufacturing system. Marginal gaps (MGs), absolute marginal discrepancy (AMD), axial gaps, and occlusal gaps were measured by X-ray microtomography (n=8). For fracture load testing, crowns were cemented in a universal abutment, and divided into four groups: ZLS without TMA, ZLS with TMA, LDS without TMA, and LDS with TMA (n=10)...
May 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/28664585/effect-of-fatigue-loading-on-the-fracture-strength-and-failure-mode-of-lithium-disilicate-and-zirconia-implant-abutments
#20
Adham Elsayed, Sebastian Wille, Majed Al-Akhali, Matthias Kern
OBJECTIVE: The aim of this study was to test five types of implant restorations using titanium, zirconia and lithium disilicate abutments after being subjected to long-term fatigue loading. MATERIALS AND METHODS: Forty single-tooth implant restorations were assembled on titanium implants (FairTwo; FairImplant). The restorations differed only in the type of abutment used and were divided into five groups [Ti: titanium; Zr: zirconia with no metal base; ZrT: zirconia with titanium base; LaT: lithium disilicate abutment with titanium base; and LcT: lithium disilicate hybrid-abutment-crown with titanium base]...
June 30, 2017: Clinical Oral Implants Research
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