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Lithium disilicate

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https://www.readbyqxmd.com/read/27908099/molecular-dynamics-study-of-nano-porous-materials-enhancement-of-mobility-of-li-ions-in-lithium-disilicate
#1
Junko Habasaki
In several nano-porous materials and their composites, enhancement of ionic conductivity has been reported and several mechanisms having different origins have been proposed so far. In the present work, ionic motion of Li ions in porous lithium disilicates is examined by molecular dynamics simulation in the constant volume conditions and the enhancement of the dynamics is predicted. Structures and dynamics of ions in a nano-porous system were characterized and visualized to clarify the mechanism of the enhancement...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27891569/chair-side-generated-posterior-monolithic-lithium-disilicate-crowns-clinical-survival-after-6%C3%A2-years
#2
Angelika Rauch, Sven Reich, Oliver Schierz
OBJECTIVES: The objective of this prospective clinical study was to evaluate the clinical performance of chair-side generated monolithic lithium disilicate crowns after 72 months. MATERIALS AND METHODS: Forty-one posterior full contour crowns made of lithium disilicate ceramic were inserted in 34 patients with a chair-side CAD/CAM technique. One crown per patient was randomly selected for evaluation at baseline, 6, 12, 24, 36, 48, 60 and 72 months according to the modified US Public Health Service criteria...
November 28, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27890356/does-8-methacryloxyoctyl-trimethoxy-silane-8-mots-improve-initial-bond-strength-on-lithium-disilicate-glass-ceramic
#3
Yukinori Maruo, Goro Nishigawa, Kumiko Yoshihara, Shogo Minagi, Takuya Matsumoto, Masao Irie
OBJECTIVES: Dental ceramic surfaces are modified with silane coupling agents, such as γ-methacryloxypropyl trimethoxy silane (γ-MPTS), to improve bond strength. For bonding between lithium disilicate glass ceramic and resin cement, the objective was to investigate if 8-methacryloxyoctyl trimethoxy silane (8-MOTS) could yield a similar performance as the widely used γ-MPTS. METHODS: One hundred and ten lithium disilicate glass ceramic specimens were randomly divided into 11 groups (n=10) according to pretreatment regime...
November 24, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27875051/clinical-significance-of-bis-gma-and-hema-orthodontic-resins-bonding-to-enamel-and-ceramic-materials
#4
Timothy Reichheld, Gregory Monfette, Ronald D Perry, Matthew Finkelman, Eric Gheewalla, Gerard Kugel
The advancement of new ceramic materials for dental crowns has prompted the need for improved methods of bonding orthodontic brackets to these surfaces. Currently, lithium-disilicate is the primary material being used for anterior crowns, while zirconia is the primary material being used in the posterior. The purpose of this study was to compare the shear bond strength of HEMA (Assure® Universal Bonding Resin) and bis-GMA (Assure® PLUS All Surface Bonding Resin) orthodontic bonding resins on enamel, lithium-disilicate, and zirconia materials...
November 2016: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/27861650/influence-of-four-different-abutment-materials-and-the-adhesive-joint-of-two-piece-abutments-on-cervical-implant-bone-and-soft-tissue
#5
Christian Mehl, Volker Gaβling, Stephan Schultz-Langerhans, Yahya Açil, Telse Bähr, Jörg Wiltfang, Matthias Kern
PURPOSE: The main aim of this study was to evaluate the influence of four different abutment materials and the adhesive joint of two-piece abutments on the cervical implant bone and soft tissue. MATERIALS AND METHODS: Sixty-four titanium implants (Camlog Conelog; 4.3 ± 9 mm) were placed bone level into the edentulous arches of four minipigs. Four different types of abutments were placed at implant exposure: zirconium dioxide, lithium disilicate, and titanium bonded to a titanium luting base with resin cement; one-piece titanium abutments served as the control...
November 2016: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/27861648/fracture-resistance-of-straight-and-angulated-zirconia-implant-abutments-supporting-anterior-three-unit-lithium-disilicate-fixed-dental-prostheses
#6
Samah Saker, Sameh El-Shahat, Mohamed Ghazy
PURPOSE: The purpose of this study was to evaluate fracture resistance of straight and angulated zirconia implant abutments supporting anterior three-unit lithium disilicate fixed dental prostheses (FDPs). MATERIALS AND METHODS: Four different test groups (n = 8) representing anterior three-unit implant-supported all-ceramic FDPs were fabricated to fit an in vitro model with two implants. Groups 1 and 2 simulated a clinical situation with an ideal implant position for maxillary left central and right lateral incisors from a prosthetic point of view, which allowed for the use of a straight, prefabricated zirconia and titanium abutment...
November 2016: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/27857080/survey-of-uk-dentists-regarding-the-use-of-cad-cam-technology
#7
D Tran, M Nesbit, H Petridis
Statement of the problem Digital workflows (CAD/CAM) have been introduced in dentistry during recent years. No published information exists on dentists' use and reporting of this technology.Purpose The purpose of this survey was to identify the infiltration of CAD/CAM technology in UK dental practices and to investigate the relationship of various demographic factors to the answers regarding use or non-use of this technology.Materials and methods One thousand and thirty-one online surveys were sent to a sample of UK dentists composing of both users and non-users of CAD/CAM...
November 18, 2016: British Dental Journal
https://www.readbyqxmd.com/read/27855994/flexural-resistance-of-heat-pressed-and-cad-cam-lithium-disilicate-with-different-translucencies
#8
Riccardo Fabian Fonzar, Michele Carrabba, Maurizio Sedda, Marco Ferrari, Cecilia Goracci, Alessandro Vichi
OBJECTIVE: To compare flexural strength of CAD-CAM and heat-pressed lithium disilicate. METHODS: For Pressed specimens (Group A), acrylate polymer blocks were cut with a saw in bars shape. Sprueing, investing and preheating procedures were carried out following manufacturer's instructions. IPS e.max Press ingots (Ivoclar-Vivadent) were divided into subgroups (n=15) according to translucency: A.1=HT-A3; A.2=MT-A3; A.3=LT-A3; A.4=MO2. Ingots were then pressed following manufacturer's instructions...
November 14, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27829834/the-prosthetic-workflow-in-the-digital-era
#9
Lidia Tordiglione, Michele De Franco, Giovanni Bosetti
The purpose of this retrospective study was to clinically evaluate the benefits of adopting a full digital workflow for the implementation of fixed prosthetic restorations on natural teeth. To evaluate the effectiveness of these protocols, treatment plans were drawn up for 15 patients requiring rehabilitation of one or more natural teeth. All the dental impressions were taken using a Planmeca PlanScan® (Planmeca OY, Helsinki, Finland) intraoral scanner, which provided digital casts on which the restorations were digitally designed using Exocad® (Exocad GmbH, Germany, 2010) software and fabricated by CAM processing on 5-axis milling machines...
2016: International Journal of Dentistry
https://www.readbyqxmd.com/read/27826383/shear-bond-strength-of-veneering-ceramic-to-coping-materials-with-different-pre-surface-treatments
#10
Natasya Ahmad Tarib, Norsamihah Anuar, Marlynda Ahmad
PURPOSE: Pre-surface treatments of coping materials have been recommended to enhance the bonding to the veneering ceramic. Little is known on the effect on shear bond strength, particularly with new coping material. The aim of this study was to investigate the shear bond strength of veneering ceramic to three coping materials: i) metal alloy (MA), ii) zirconia oxide (ZO), and iii) lithium disilicate (LD) after various pre-surface treatments. MATERIALS AND METHODS: Thirty-two (n = 32) discs were prepared for each coping material...
October 2016: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/27820688/premolar-axial-wall-height-effect-on-cad-cam-crown-retention
#11
C Gillette, R Buck, N DuVall, S Cushen, M Wajdowicz, H Roberts
OBJECTIVE: To evaluate the significance of reduced axial wall height on retention of adhesively luted, all-ceramic, lithium disilicate premolar computer-aided design/computer-aided manufacturing (CAD/CAM) crowns based on preparations with a near ideal total occlusal convergence of 10°. METHODS: Forty-eight recently extracted premolars were randomly divided into four groups (n=12). Each group received all-ceramic CAD/CAM crown preparations featuring axial wall heights of 0, 1, 2, and 3 mm, respectively, all with a 10° total occlusal convergence...
November 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27802123/marginal-adaptation-and-quality-of-interfaces-in-lithium-disilicate-crowns-influence-of-manufacturing-and-cementation-techniques
#12
C A Melo Freire, G A Borges, Dbm Caldas, R S Santos, S A Ignácio, R F Mazur
PURPOSE: To evaluate the cement line thickness and the interface quality in milled or injected lithium disilicate ceramic restorations and their influence on marginal adaptation using different cement types and different adhesive cementation techniques. METHODS AND MATERIALS: Sixty-four bovine teeth were prepared for full crown restoration (7.0±0.5 mm in height, 8.0 mm in cervical diameter, and 4.2 mm in incisal diameter) and were divided into two groups: CAD/CAM automation technology, IPS e...
November 1, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27796072/time-efficiency-analysis-of-the-treatment-with-monolithic-implant-crowns-in-a-digital-workflow-a-randomized-controlled-trial
#13
Tim Joda, Urs Brägger
OBJECTIVES: The aim of the randomized controlled trial was to analyze time-efficiency of a treatment with implant crowns made of monolithic lithium disilicate (LS2) plus titanium base vs. porcelain fuse to zirconium dioxide (ZrO2 ) in a digital workflow. MATERIALS AND METHODS: Twenty study participants were included for single-tooth replacement in premolar and molar sites. Baseline was the start of the prosthetic treatment. All patients received transocclusal screw-retained implant reconstructions on a soft tissue level-type implant...
November 2016: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/27769518/comparison-of-fracture-strength-and-failure-mode-of-different-ceramic-implant-abutments
#14
Adham Elsayed, Sebastian Wille, Majed Al-Akhali, Matthias Kern
STATEMENT OF PROBLEM: The whitish color of zirconia (ZrO2) abutments offers favorable esthetics compared with the grayish color of titanium (Ti) abutments. Nonetheless, ZrO2 has greater opacity, making it difficult to achieve natural tooth color. Therefore, lithium disilicate (LaT) abutments have been suggested to replace metal abutments. PURPOSE: The purpose of this in vitro study was to evaluate the fracture strength and failure mode of single-tooth implant restorations using ZrO2 and LaT abutments, and to compare them with titanium (Ti) abutments...
October 18, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27765394/effect-of-brand-and-shade-of-resin-cements-on-the-final-color-of-lithium-disilicate-ceramic
#15
Doğu Ömür Dede, Gözlem Ceylan, Burak Yilmaz
STATEMENT OF PROBLEM: Resin cements are available in various shades from different manufacturers. However, there is no standard for the optical properties of these cements, which may result in differences in the color of translucent ceramic restorations. PURPOSE: The purpose of this in vitro study was to evaluate the effects of different shades and brands of resin cements on the color of a lithium disilicate ceramic. MATERIALS AND METHODS: Ten ceramic disks (11×1...
October 17, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27730222/adhesive-esthetic-treatment-%C3%A2-of-non-syndromic-maxillary-anterior-%C3%A2-microdontia-in-young-high-demanding-patients-a-case-series
#16
Federico Tirone, Stefano Salzano, Erik Rolando
BACKGROUND: Microdontia of the maxillary anterior teeth occurs quite frequently but is poorly documented. The literature describes several treatment choices, which are often focused on an orthodontic approach rather than a restorative one. The latest trends in restorative dentistry and the new ceramic materials, such as lithium disilicate, allow clinicians to perform esthetic rehabilitations based on microinvasive approaches that are most appropriate for younger patients. SUMMARY: Four patients, all employed in the field of dentistry, presented at our dental practice complaining of diastemata between their maxillary anterior teeth...
2016: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/27723188/the-conometric-concept-definitive-fixed-lithium-disilicate-restorations-supported-by-conical-abutments
#17
Marco Degidi, Diego Nardi, Gianluca Sighinolfi, Adriano Piattelli
PURPOSE: The use of the conical coupling connection to support definitive restorations was evaluated in cases involving full acrylic resin or hybrid acrylic resin-composite prostheses. The aim of this study was to evaluate the performance of definitive fixed partial prostheses made with lithium disilicate and supported by coupling connection abutments and healed implants. MATERIALS AND METHODS: The prostheses were placed in the posterior regions of partially edentulous patients; 65 patients received fixed lithium disilicate restorations splinted with conical coupling connections to two implants...
October 10, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27717755/optical-properties-of-pre-colored-dental-monolithic-zirconia-ceramics
#18
Hee-Kyung Kim, Sung-Hun Kim
OBJECTIVES: The purposes of this study were to evaluate the optical properties of recently marketed pre-colored monolithic zirconia ceramics and to compare with those of veneered zirconia and lithium disilicate glass ceramics. METHODS: Various shades of pre-colored monolithic zirconia, veneered zirconia, and lithium disilicate glass ceramic specimens were tested (17.0×17.0×1.5mm, n=5). CIELab color coordinates were obtained against white, black, and grey backgrounds with a spectrophotometer...
December 2016: Journal of Dentistry
https://www.readbyqxmd.com/read/27717514/adhesion-of-living-cells-to-abutment-materials-dentin-and-adhesive-luting-cement-with-different-surface-qualities
#19
Christian Mehl, Matthias Kern, Anna-Marie Schütte, Laith F Kadem, Christine Selhuber-Unkel
OBJECTIVE: We tested the adhesion properties of living gingival fibroblasts on three different implant abutment materials, adhesive resin used to bond bi-partite abutments, and human dentin. METHODS: Discs of lithium disilicate (LS), zirconium dioxide (Zr), adhesive resin cement (AR), titanium (Ti), and human dentin (HD) were fabricated with three different levels of surface roughness (rough, machined, and polished). Ra and Rz, water contact angle, and cell detachment forces were measured...
December 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27700132/placing-anterior-lithium-disilicate-restorations-using-a-dual-cure-resin-cement
#20
Stephen D Poss
Depending on the case, predictably seating today's esthetic indirect restorations can be challenging. Ultimately, the cementation and adhesive materials selected, combined with the techniques used for their placement, can greatly affect the quality and efficient delivery of laboratory-fabricated restorations. New adhesive bonding and cementation materials have the potential to simplify the delivery of indirect restorations and simultaneously reduce and/or eliminate many of the challenges clinicians face during the placement process...
October 2016: Compendium of Continuing Education in Dentistry
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