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Lithium disilicate

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https://www.readbyqxmd.com/read/29457311/bicuspid-axial-wall-height-effect-on-cad-cam-crown-fracture-mode-on-preparations-containing-advanced-total-occlusal-convergence
#1
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/29417647/fracture-resistance-of-titanium-based-lithium-disilicate-and-zirconia-implant-restorations
#2
Evan E Roberts, Clifton W Bailey, Deborah L Ashcraft-Olmscheid, Kraig S Vandewalle
PURPOSE: To evaluate the fracture resistance of a newer lithium disilicate abutment material. MATERIALS AND METHODS: A premolar-shaped implant crown was designed using CAD/CAM software, and four groups of implant and crown combinations were milled: (1) lithium-disilicate hybrid-abutment crown; (2) "screwmentable" lithium-disilicate hybrid abutment/lithium-disilicate crown with screw channel; (3) lithium-disilicate hybrid abutment/lithium-disilicate crown; and (4) zirconia hybrid abutment/lithium-disilicate crown (control)...
February 8, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29402640/effect-of-thickness-on-optical-properties-of-monolithic-cad-cam-ceramics
#3
Meryem Gülce Subaşı, Gülce Alp, William M Johnston, Burak Yilmaz
OBJECTIVE: To compare the effect of material and thickness on the color stability and relative translucency parameters (RTP) for monolithic ceramics subjected to coffee thermocycling. METHODS: Four specimens each at thicknesses of 0.5, 0,7 and 1 mm were sectioned from monolithic ceramics [preshaded monolithic zirconia (MonZr), lithium disilicate (LDS) and zirconia reinforced lithium silicate (ZLS)]. The specimens were glazed and subjected to 5000 coffee thermocycling...
January 31, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29402538/approximate-relative-fatigue-life-estimation-methods-for-thin-walled-monolithic-ceramic-crowns
#4
Sadia Nasrin, Noriko Katsube, Robert R Seghi, Stanislav I Rokhlin
OBJECTIVES: The objective is to establish an approximate relative fatigue life estimation method under simulated mastication load for thin-walled monolithic restorations. METHODS: Experimentally measured fatigue parameters of fluormica, leucite, lithium disilicate and yttrium-stabilized zirconia in the existing literature were expressed in terms of the maximum cyclic stress and stress corresponding to initial crack size prior to N number of loading cycles to assess their differences...
February 2, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29399950/a-literature-review-on-the-new-polymer-infiltrated-ceramic-network-material-picn
#5
REVIEW
Júlia Cadorim Facenda, Marcia Borba, Pedro Henrique Corazza
OBJECTIVES: Ceramics and composites are the most used materials for dental application. Recently, the characteristics of both were combined on the called "polymer-infiltrated ceramic-network" (PICN). The aim of this review is to report the behavior of PICN, comparing the findings that may support the correct clinical application. OVERVIEW: The PICN material is a structure with a sintered ceramic matrix infiltrated with a polymer matrix. Studies evaluated this material microstructure and composition, mechanical properties and adhesive behavior...
February 5, 2018: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29395474/fatigue-resistance-of-all-ceramic-fixed-partial-dentures-fatigue-tests-and-finite-element-analysis
#6
S D Heintze, D Monreal, M Reinhardt, A Eser, A Peschke, J Reinshagen, V Rousson
OBJECTIVE: To estimate the fatigue resistance of a new translucent zirconia material in comparison to lithium disilicate for 3-unit fixed partial dentures (FPDs). METHODS: Eighteen 3-unit FPDs (replacement of first upper molar) with a connector size of 4mm×4mm were dry milled with a five-axis milling machine (Zenotec Select, Wieland, Germany) using discs made of a new translucent zirconia material (IPS e.max ZirCAD MT, Ivoclar Vivadent). Another 9 FPDs with a reduced connector size (3mm×4mm) were milled...
January 27, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29385032/disilicate-dental-ceramic-surface-preparation-by-1070-nm-fiber-laser-thermal-and-ultrastructural-analysis
#7
Carlo Fornaini, Federica Poli, Elisabetta Merigo, Nathalie Brulat-Bouchard, Ahmed El Gamal, Jean-Paul Rocca, Stefano Selleri, Annamaria Cucinotta
Lithium disilicate dental ceramic bonding, realized by using different resins, is strictly dependent on micro-mechanical retention and chemical adhesion. The aim of this in vitro study was to investigate the capability of a 1070 nm fiber laser for their surface treatment. Samples were irradiated by a pulsed fiber laser at 1070 nm with different parameters (peak power of 5, 7.5 and 10 kW, repetition rate (RR) 20 kHz, speed of 10 and 50 mm/s, and total energy density from 1.3 to 27 kW/cm²) and the thermal elevation during the experiment was recorded by a fiber Bragg grating (FBG) temperature sensor...
January 31, 2018: Bioengineering
https://www.readbyqxmd.com/read/29383829/failure-load-effect-of-molar-axial-wall-height-with-cad-cam-ceramic-crowns-with-moderate-occlusal-convergence
#8
Wyeth Hoopes, Sara Cushen, Nicholas DuVall, Michael Wajdowicz, John Brewster, Howard Roberts
OBJECTIVES: To evaluate the significance of axial wall height (AWH) in molar fracture resistance involving CAD/CAM adhesively bonded, all-ceramic full coverage restorations on preparations with moderate total occlusal convergence (TOC) (16°). MATERIALS AND METHODS: 60 newly extracted maxillary third molars were divided into 5 groups (n = 12). Specimens were prepared for full-coverage, all ceramic restorations with occlusal cervical AWHs of 4, 3, 2, 1 as well as a flat preparation (0 mm AWH) with all preparations with AWH containing a moderate 16° TOC...
January 31, 2018: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29379906/color-match-of-luting-composites-and-try-in-pastes-the-impact-on-the-final-color-of-cad-cam-lithium-disilicate-restorations
#9
Petros Mourouzis, Elisabeth Koulaouzidou, Georgios Palaghias, Maria Helvatjoglu-Antoniades
AIM: Color matching of the restoration to the adjacent teeth can be difficult due to the translucency of the ceramic and the visual exposure of the polymerized resin cement through the ceramic material. The aim of this study was to identify color differences between try-in pastes and the corresponding luting resin composites. MATERIALS AND METHODS: The materials tested were Variolink Veneer, Variolink Try-In, Variolink Esthetic LC, and Variolink Esthetic Try-In...
2018: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/29368375/fracture-resistance-of-prepared-premolars-restored-with-bonded-new-lab-composite-and-all-ceramic-inlay-onlay-restorations-laboratory-study
#10
Ramy Ahmed Wafaie, Ashraf Ibrahim Ali, Salah Hasab Mahmoud
OBJECTIVES: To assess the influence of new light curing lab composite, lithium-disilicate glass-ceramic and yttrium-stabilized zirconia-based ceramic on the fracture resistance of maxillary premolars with class II inlay and onlay preparations. METHODS: Seventy sound maxillary premolars were divided randomly into seven main groups. The first group was left intact (control group). The remaining six groups were prepared with inlay and onlay cavities and restored with lab composite (SR Nexco), lithium-disilicate glass-ceramic (IPS e...
January 25, 2018: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29364328/the-marginal-fit-of-lithium-disilicate-crowns-press-vs-cad-cam
#11
Basel Azar, Steve Eckert, Josef Kunkela, Tomaš Ingr, Radek Mounajjed
This study aimed to compare the vertical marginal gap of teeth restored with lithium disilicate crowns fabricated using CAD/CAM or by pressed ceramic approach. Twenty mandibular third molar teeth were collected after surgical extractions and prepared to receive full veneer crowns. Teeth were optically scanned and lithium disilicate blocks were used to fabricate crowns using CAD/CAM technique. Polyvinyl siloxane impressions of the prepared teeth were made and monolithic pressed lithium disilicate crowns were fabricated...
2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/29333771/-effect-of-hydrofluoric-acid-concentration-on-the-surface-morphology-and-bonding-effectiveness-of-lithium-disilicate-glass-ceramics-to-resin-composites
#12
Qian Hailan, Ren Lingyan, Nie Rongrong, Meng Xiangfeng
OBJECTIVE: This study aimed at determining the influence of hydrofluoric acid (HF) in varied concentrations on the surface morphology of lithium disilicate glass ceramics and bond durability between resin composites and post-treated lithium disilicate glass ceramics. METHODS: After being sintered, ground, and washed, 72 as-prepared specimens of lithium disilicate glass ceramics with dimensions of 11 mm×13 mm×2 mm were randomly divided into three groups. Each group was treated with acid solution [32% phosphoric acid (PA) or 4% or 9...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29333707/impact-of-gastric-acid-induced-surface-changes-on-mechanical-behavior-and-optical-characteristics-of-dental-ceramics
#13
Aditi Kulkarni, James Rothrock, Jeffery Thompson
PURPOSE: To test the impact of exposure to artificial gastric acid combined with toothbrush abrasion on the properties of dental ceramics. Earlier research has indicated that immersion in artificial gastric acid has caused increased surface roughness of dental ceramics; however, the combined effects of acid immersion and toothbrush abrasion and the impact of increased surface roughness on mechanical strength and optical properties have not been studied. MATERIALS AND METHODS: Three commercially available ceramics were chosen for this study: feldspathic porcelain, lithium disilicate glass-ceramic, and monolithic zirconium oxide...
January 14, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29323782/the-effect-of-surface-treatments-on-the-mechanical-and-optical-behaviors-of-cad-cam-restorative-materials
#14
Sevcan Kurtulmus-Yilmaz, Esra Cengiz, Salim Ongun, Izgen Karakaya
PURPOSE: To evaluate the effect of different surface treatments on mechanical and optical properties of lithium disilicate ceramic (IPS e.max CAD), 2 resin nanoceramics (Lava Ultimate, GC Cerasmart), and polymer-infiltrated ceramic network material (Vita Enamic). MATERIALS AND METHODS: CAD/CAM blocks were sectioned into 4 × 1 × 14 mm3 bars for three-point bending test and 1 × 8 × 8 mm3 square specimens were obtained for color and translucency measurements. Bar-shaped and square specimens were divided into five groups according to the surface treatment method as: control (no treatment), hydrofluoric acid etching, airborne-particle abrasion, 2 W and 3 W Er,Cr:YSGG laser irradiation (n = 10)...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29315956/fatigue-behavior-of-crystalline-reinforced-glass-ceramics
#15
Carolina Barbosa Vicari, Bárbara de Oliveira Magalhães, Jason Alan Griggs, Márcia Borba
PURPOSE: To evaluate the fatigue behavior of two crystalline-reinforced ceramics: leucite-reinforced (VL) and lithium disilicate-based (VD) glass-ceramics. MATERIALS AND METHODS: Bar-shaped specimens (16 × 4 × 1.2 mm) were produced for each ceramic using prefabricated CAD/CAM blocks. For each group, 30 specimens were subjected to a three-point flexural strength test in a universal testing machine. For VL and VD, 36 and 41 specimens were subjected to a cyclic fatigue test, respectively...
January 3, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29311428/fracture-strengths-of-endocrown-restorations-fabricated-with-different-preparation-depths-and-cad-cam-materials
#16
Burcu Kanat-Ertürk, Serkan Saridağ, Ege Köseler, Dilek Helvacioğlu-Yiğit, Egemen Avcu, Yasemin Yildiran-Avcu
The objectives of this study were to compare the fracture strength of endocrown restorations fabricated with different preparation depth and various CAD/CAM ceramics, and to assess the fracture types. Endodontically treated 100 extracted human permanent maxillary centrals were divided into two preparation depth groups as short (S: 3-mm-deep) and long (L: 6-mm-deep), then five ceramic subgroups, namely: feldspathic-ceramic (Vita Mark II-VM2), lithium-disilicate glass-ceramic (IPS e.max CAD-E.max), resin-ceramic (LAVA Ultimate-LU), polymer infiltrated ceramic (Vita Enamic-VE) and monoblock zirconia (inCoris TZI-TZI) (n=10/subgroup)...
December 29, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29310876/effect-of-ceramic-material-and-resin-cement-systems-on-the-color-stability-of-laminate-veneers-after-accelerated-aging
#17
Seong-Min Lee, Yu-Sung Choi
STATEMENT OF PROBLEM: Laminate veneers are susceptible to color change during clinical service. Studies that compare the effects of different ceramic and resin cement systems on color stability are lacking. PURPOSE: The purpose of this in vitro study was to evaluate the color stability of laminate veneers after accelerated aging using different ceramic and resin cement systems. MATERIAL AND METHODS: Ceramic specimens (N=168; shade A1; thickness, 0...
January 5, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29310875/comparison-of-the-mechanical-properties-of-translucent-zirconia-and-lithium-disilicate
#18
Sung Joon Kwon, Nathaniel C Lawson, Edward E McLaren, Amir H Nejat, John O Burgess
STATEMENT OF PROBLEM: Three mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) possesses excellent mechanical properties but is relatively opaque. Five mol% yttria-stabilized zirconia polycrystal (5Y-ZP) offers improved translucency, but many of its clinical properties have not been compared with those of 3Y-TZP and lithium disilicate. PURPOSE: The purpose of this in vitro study was to compare the flexural strength, translucency parameter, bond strength, and enamel and material wear of 5Y-ZP (Katana UTML) with 3Y-TZP (Katana HT) and lithium disilicate (e...
January 5, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29308509/-effect-of-the-thickness-of-reinforced-glass-ceramics-on-the-degree-of-conversion-of-dual-cure-resin-cements
#19
Lin-Lin Zhu, Li-Hong Qiu, Li-Yang Liu, Xiao-Lin Li
PURPOSE: To determine the effect of the thickness of reinforced glass ceramics on the degree of conversion (DC) of three dual-cure resin cements (Multilink N, RelyX Ultimate and NX3-Nexus). METHODS: Upcera reinforced glass ceramics and IPS e.max CAD test specimen were processed, with different thickness, transmittance was tested by ultraviolet and visible spectrometer. The DC was evaluated using Fourier transform infrared (FT-IR) spectrometer, then the degree of conversion of polymerization before and after curing was calculated...
October 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/29303973/effect-of-lithium-disilicate-reinforced-liner-treatment-on-bond-and-fracture-strengths-of-bilayered-zirconia-all-ceramic-crown
#20
Yong-Seok Jang, Hyeong-Rok Noh, Min-Ho Lee, Myung-Jin Lim, Tae-Sung Bae
This study was performed to evaluate the effect of a lithium-disilicate spray-liner application on both the bond strength between zirconia cores and heat-pressed lithium-disilicate glass-ceramic veneers, and the fracture strength of all-ceramic zirconia crowns. A lithium-disilicate reinforced liner was applied on the surface of a zirconia core and lithium-disilicate glass-ceramic was veneered on zirconia through heat press forming. Microtensile and crown fracture tests were conducted in order to evaluate, respectively, the bonding strength between the zirconia cores and heat pressed lithium-disilicate glass-ceramic veneers, and the fracture strength of bilayered zirconia all-ceramic crowns...
January 5, 2018: Materials
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