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Lithium disilicate

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https://www.readbyqxmd.com/read/28424734/influence-of-teeth-preparation-finishing-on-the-adaptation-of-lithium-disilicate-crowns
#1
Bruna Salamoni Sinhori, Mauro Amaral Caldeira de Andrada, Guilherme Carpena Lopes, Sylvio Monteiro Junior, Luiz Narciso Baratieri
The polishing step of teeth preparations for crowns is a step often performed, so that there is an increased time during the clinical procedure. The aim of this study is to evaluate the marginal and internal adaptation of all-ceramic CAD/CAM lithium disilicate crowns in polished preparations for crown and nonpolished preparations for crowns. For this purpose, 20 first molars were selected, which were divided into two groups (n = 10) G1, teeth that received surface roughening similar to preparation without polishing, and G2 (control), polished preparations...
2017: International Journal of Biomaterials
https://www.readbyqxmd.com/read/28422367/microtensile-bond-strength-of-a-resin-cement-to-silica-based-and-y-tzp-ceramics-using-different-surface-treatments
#2
Alireza Keshvad, Seyed Mohammad Reza Hakimaneh
PURPOSE: To evaluate the effects of different surface treatments on the microtensile bond strength (μTBS) of bonding between resin cement and lithia or zirconia-based ceramics using an in vitro study. MATERIALS AND METHODS: Three zirconia ceramic blocks (IPS e.max ZirCAD) and three lithium disilicate ceramic blocks (IPS e.max CAD) were sintered and duplicated in resin composite. The zirconia specimens underwent various treatments (n = 1): (i) Sandblast + primer (ZiSa); (ii) sandblast + laser irradiation + primer (ZiSaLa); or (iii) laser irradiation + primer (ZiLa)...
April 19, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28415491/the-substitution-of-the-implant-and-abutment-for-their-analogs-in-mechanical-studies-in-vitro-and-in-silico-analysis
#3
Rafael Soares Gomes, Edmara Tatiely Pedroso Bergamo, Dimorvan Bordin, Altair Antoninha Del Bel Cury
The use of analogs could reduce the cost of mechanical tests involving implant-supported crowns, but it is unclear if it would negatively affect the data accuracy. This study evaluated the substitution of the implant by implants analogs or abutment analogs as a support for crowns in mechanical tests, taking into account stress distribution and fracture load of monolithic lithium disilicate crowns. Thirty lithium disilicate monolithic crowns were randomized into three groups according to the set: Implant+abutment (IA); implant analog+abutment (IAA); abutment analog (AA)...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28413061/mechanical-behavior-of-bulk-direct-composite-versus-block-composite-and-lithium-disilicate-indirect-class-ii-restorations-by-cad-fem-modeling
#4
Pietro Ausiello, Stefano Ciaramella, Andrea Fabianelli, Antonio Gloria, Massimo Martorelli, Antonio Lanzotti, David C Watts
OBJECTIVES: To study the influence of resin based and lithium disilicate materials on the stress and strain distributions in adhesive class II mesio-occlusal-distal (MOD) restorations using numerical finite element analysis (FEA). To investigate the materials combinations in the restored teeth during mastication and their ability to relieve stresses. METHODS: One 3D model of a sound lower molar and three 3D class II MOD cavity models with 95° cavity-margin-angle shapes were modelled...
April 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28407306/the-influence-of-the-emergence-profile-on-the-amount-of-undetected-cement-excess-after-delivery-of-cement-retained-implant-reconstructions
#5
M Sancho-Puchades, D Crameri, M Özcan, I Sailer, R E Jung, C H F Hämmerle, D S Thoma
OBJECTIVE: To test whether or not one of two emergence profile designs (concave or convex) is superior to the other in terms of remaining cement following cementation of reconstructions on individualized abutments and careful cement removal. MATERIALS AND METHODS: A central incisor with a single implant-supported reconstruction was selected as a model. Six types of abutments (n = 10) with two different emergence profile designs (concave (CC) and convex (CV)) and three crown-abutment margin depths (epimucosal, 1...
April 13, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28402734/masking-colored-substrates-using-monolithic-and-bilayer-cad-cam-ceramic-structures
#6
G R Basso, A B Kodama, A H Pimentel, M R Kaizer, A Della Bona, R R Moraes, N Boscato
OBJECTIVE: To evaluate the masking ability and translucency of monolithic and bilayer CAD-CAM ceramic structures. METHODS: Discs of high translucency (HT) and low translucency (LT) lithium disilicate-based ceramic (IPS e.max CAD) with different thicknesses (0.7, 1, 1.5, and 2 mm) were evaluated as a monolithic structure or combined (bilayer) with a 0.5-mm-thick zirconia framework (IPS e.max ZirCAD). The masking ability and translucency were calculated based on CIE L*a*b* color coordinates measured with a spectrophotometer (SP60, X-Rite)...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28402732/different-methods-for-inlay-production-effect-on-internal-and-marginal-adaptation-adjustment-time-and-contact-point
#7
M P Rippe, C Monaco, L Volpe, M A Bottino, R Scotti, L F Valandro
The aim of this study was to evaluate the effect of different production methods of resin and ceramic inlays on marginal and internal adaptation, adjustment time, and proximal contacts. Forty premolars were selected, embedded (their roots), and prepared to receive inlays that were made as follows (n=10): LaRe-digital impression with a Lava C.O.S. scanner, followed by milling of Lava Ultimate block (composite resin) in a milling center; CeRe-digital impression with a Cerec 3D Bluecam scanner, followed by milling of Lava Ultimate block in Cerec; CeDis-digital impression with a Cerec 3D Bluecam scanner, followed by milling of IPS e...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28398648/esthetic-rehabilitation-of-retained-primary-teeth-a-conservative-approach
#8
Cristina Parise Gré, Vitor Schweigert Bona, Diogo Pedrollo Lise, Sylvio Monteiro Júnior
With the advancement in ceramic restorations bonded to tooth structure, the treatment has become a feasible and conservative option to restore teeth with alteration in shape when owing to high demand in esthetics, with or without minimum tooth preparation. This article describes a report of a 32-year-old woman who was dissatisfied with her smile. The patient reported that she still had deciduous teeth, and that the maxillary lateral incisors had been restored with direct resin composite to correct the teeth shape...
April 11, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28385444/spectrophotometric-analysis-of-clinical-factors-related-to-the-color-of-ceramic-restorations-a-pilot-study
#9
Ana Paula Perroni, César D Bergoli, Mateus Bertolini F Dos Santos, Rafael R Moraes, Noéli Boscato
STATEMENT OF PROBLEM: Shade matching natural teeth with ceramic restorations is still an esthetic, clinical challenge. PURPOSE: The purpose of this prospective clinical study was to evaluate the influence of color-related factors on the color variation of ceramic restorations based on spectrophotometric analysis. MATERIAL AND METHODS: Color records were obtained from 11 participants who received 38 lithium disilicate restorations. CIELab color coordinates were measured with a spectrophotometer on the ceramic restoration, tooth (baseline), prepared tooth, and luted ceramics...
April 3, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28385437/effect-of-prior-silane-application-on-the-bond-strength-of-a-universal-adhesive-to-a-lithium-disilicate-ceramic
#10
André Fábio Vasconcelos Moro, Amanda Barreto Ramos, Gustavo Miranda Rocha, Cesar Dos Reis Perez
STATEMENT OF PROBLEM: Universal adhesives combine silane and various monomers in a single bottle to make them more versatile. Their adhesive performance is unclear. PURPOSE: The purpose of this in vitro study was to assess the effects of an additional silane application before using a universal adhesive on the adhesion between a disilicate glass ceramic and a composite resin by using a microshear bond strength test (μSBS) and fracture analysis immediately and after thermocycling...
April 3, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28352204/marginal-fit-of-all-ceramic-crowns-fabricated-using-two-extraoral-cad-cam-systems-in-comparison-with-the-conventional-technique
#11
Fawaz Alqahtani
OBJECTIVE: The purpose of this study was to determine the effect of two extraoral computer-aided design (CAD) and computer-aided manufacturing (CAM) systems, in comparison with conventional techniques, on the marginal fit of monolithic CAD/CAM lithium disilicate ceramic crowns. STUDY DESIGN: This is an in vitro interventional study. PLACE AND DURATION OF STUDY: The study was carried out at the Department of Prosthodontics, School of Dentistry, Prince Sattam Bin Abdul-Aziz University, Saudi Arabia, from December 2015 to April 2016...
2017: Clinical, Cosmetic and Investigational Dentistry
https://www.readbyqxmd.com/read/28343675/influence-of-surface-finishing-on-fracture-load-and-failure-mode-of-glass-ceramic-crowns
#12
Rafael Tagliari Mores, Márcia Borba, Pedro Henrique Corazza, Álvaro Della Bona, Paula Benetti
STATEMENT OF PROBLEM: Ceramic restorations often require adjustments using diamond rotary instruments, which damage the glazed surface. The effect of these adjustments on the fracture behavior of these restorations is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the influence of induced surface defects on the fracture load and mode of failure of lithium disilicate-based (LDS) glass ceramic restorations. MATERIAL AND METHODS: Premolar crowns were obtained from LDS computer-aided design and computer-aided manufacturing blocks (n=60) and glazed...
March 23, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28280997/shear-bond-wettability-and-afm-evaluations-on-co2-laser-irradiated-cad-cam-ceramic-surfaces
#13
Ahmed El Gamal, Etienne Medioni, Jean Paul Rocca, Carlo Fornaini, Omid H Muhammad, Nathalie Brulat-Bouchard
The purpose of this study is to determine the CO2 laser irradiation in comparison with sandblasting (Sb), hydrofluoric acid (Hf) and silane coupling agent (Si) on shear bond strength (SBS), roughness (Rg) and wettability (Wt) of resin cement to CAD/CAM ceramics. Sixty (CAD/CAM) ceramic discs were prepared and distributed into six different groups: group A, control lithium disilicate (Li); group B, control zirconia (Zr); group C, Li: CO2/HF/Si; group D, Li: HF/Si; group E, Zr: CO2/Sb/Si; group F, Zr: Sb/Si. Result showed significant difference between irradiated and non-irradiated in terms of shear bond strength for zirconia ceramics (p value = 0...
March 9, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28279435/three-dimensional-characterization-and-distribution-of-fabrication-defects-in-bilayered-lithium-disilicate-glass-ceramic-molar-crowns
#14
Yutao Jian, Zi-Hua He, Li Dao, Michael V Swain, Xin-Ping Zhang, Ke Zhao
OBJECTIVE: To investigate and characterize the distribution of fabrication defects in bilayered lithium disilicate glass-ceramic (LDG) crowns using micro-CT and 3D reconstruction. METHODS: Ten standardized molar crowns (IPS e.max Press; Ivoclar Vivadent) were fabricated by heat-pressing on a core and subsequent manual veneering. All crowns were scanned by micro-CT and 3D reconstructed. Volume, position and sphericity of each defect was measured in every crown. Each crown was divided into four regions-central fossa (CF), occlusal fossa (OF), cusp (C) and axial wall (AW)...
March 6, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28274651/translucent-zirconia-in-the-ceramic-scenario-for-monolithic-restorations-a-flexural-strength-and-translucency-comparison-test
#15
Michele Carrabba, Andrew J Keeling, Aziz Aziz, Alessandro Vichi, Riccardo Fabian Fonzar, David Wood, Marco Ferrari
OBJECTIVE: To compare three different compositions of Yttria-Tetragonal Zirconia Polycrystal (Y-TZP) ceramic and a lithium disilicate ceramic in terms of flexural strength and translucency. METHODS: Three zirconia materials of different composition and translucency, Aadva ST [ST], Aadva EI [EI] and Aadva NT [NT](GC Tech, Leuven, Belgium) were cut with a slow speed diamond saw into beams and tabs in order to obtain, after sintering, dimensions of 1.2×4.0×15.0mm and 15...
March 6, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28273681/effect-of-two-polishing-systems-on-surface-roughness-topography-and-flexural-strength-of-a-monolithic-lithium-disilicate-ceramic
#16
Mahshid Mohammadibassir, Mohammad Bagher Rezvani, Hossein Golzari, Elham Moravej Salehi, Mohammad Amin Fahimi, Mohammad Javad Kharazi Fard
PURPOSE: To evaluate the effect of overglazing and two polishing procedures on flexural strength and quality and quantity of surface roughness of a monolithic lithium disilicate ceramic computer-aided design (CAD) after grinding. MATERIALS AND METHODS: This in vitro study was conducted on 52 partially crystalized bar-shaped specimens (16 × 4 × 1.6 mm) of monolithic lithium disilicate ceramic. The specimens were wet polished with 600-, 800-, and 1200-grit silicon carbide papers for 15 seconds using a grinding/polishing machine at a speed of 300 rpm...
March 8, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28267829/success-and-survival-of-various-types-of-all-ceramic-single-crowns-a-critical-review-and-analysis-of-studies-with-a-mean-follow-up-of-5-years-or-longer
#17
Alhanoof Aldegheishem, George Ioannidis, Wael Att, Haralampos Petridis
PURPOSE: The aim of this critical review was to assess the survival and success rates of all-ceramic single crowns manufactured using different ceramic materials with a mean follow-up time of 5 years or longer. MATERIALS AND METHODS: An electronic search of studies published between 1980 and 2014 complemented by manual searching was conducted in Medline and Scopus. The terms ceramic, crown, survival, success, longevity, and complications were selected as keywords...
March 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28258661/polymerization-mode-of-self-adhesive-dual-cured-dental-resin-cements-light-cured-through-various-restorative-materials
#18
Ji Suk Shim, Jeong Kyung Kang, Nayansi Jha, Jae Jun Ryu
OBJECTIVE: The aim of this study was to investigate the polymerization mode of self-adhesive, dual-cured resin cements light-cured through overlying materials with different degree of translucency by measuring the degree of conversion (DC). MATERIALS AND METHODS: Three kinds of self-adhesive, dual-cured resin cements (G-CEM LinkAce(TM) , Maxcem Elite(TM) , and BisCem(®) ) were light-cured through three different restorative materials that included porcelain-fused metal (PFM), zirconia, and lithium disilicate...
March 4, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28258266/effect-of-newly-developed-resin-cements-and-thermocycling-on-the-strength-of-porcelain-laminate-veneers
#19
Fawaz I Alqahtani
AIM: The aim of this study was to determine the effect of different luting cements and accelerated artificial aging (AAA) in the fracture resistance of porcelain laminate veneers (PLVs). MATERIALS AND METHODS: A total of 80 disc-shaped specimens were prepared using computer-aided design/computer-aided milling technology from lithium disilicate glass-ceramic blocks. Specimens (0.5 mm thick, 10 mm diameter) were divided into eight groups of 10 specimens per group...
March 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28257251/interfacial-characteristics-and-bond-durability-of-universal-adhesive-to-various-substrates
#20
A Tsujimoto, W W Barkmeier, T Takamizawa, T M Wilwerding, M A Latta, M Miyazaki
OBJECTIVE: This study investigated the interfacial characteristics and bond durability of universal adhesives to various substrates. METHODS AND MATERIALS: Two universal adhesives were used: 1) Scotchbond Universal and 2) G-Premio Bond. The substrates used were bovine enamel and dentin with or without phosphoric acid etching, resin composite, lithium disilicate and leucite-reinforced glass ceramics, zirconia, and metal alloys. The surface free energy and the parameters of various substrates and of substrates treated by adhesive after light irradiation were determined by measuring the contact angles of three test liquids...
March 2017: Operative Dentistry
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